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产品型号11293的Datasheet PDF文件预览

LT1129/LT1129-3.3/LT1129-5  
Micropower Low Dropout  
Regulators with Shutdown  
U
DESCRIPTIO  
FEATURES  
The LT®1129/LT1129-3.3/LT1129-5 are micropower low  
dropout regulators with shutdown. The devices are ca-  
pableofsupplying700mAofoutputcurrentwithadropout  
voltage of 0.4V at maximum output. Designed for use in  
battery-poweredsystemsthelowquiescentcurrent, 50µA  
operating and 16µA in shutdown, make them an ideal  
choice. The quiescent current does not rise in dropout as  
it does with many other low dropout PNP regulators.  
0.4V Dropout Voltage  
700mA Output Current  
50µA Quiescent Current  
No Protection Diodes Needed  
Adjustable Output from 3.8V to 30V  
3.3V and 5V Fixed Output Voltages  
Controlled Quiescent Current in Dropout  
Shutdown  
16µA Quiescent Current in Shutdown  
Other features of the LT1129 /LT1129-3.3/LT1129-5 in-  
clude the ability to operate with small output capacitors.  
They are stable with only 3.3µF on the output while most  
older devices require between 10µF and 100µF for stabil-  
ity. Alsotheinputmaybeconnectedtogroundorareverse  
voltage without reverse current flow from output to input.  
This makes the LT1129/LT1129-3.3/LT1129-5 ideal for  
backuppowersituationswheretheoutputisheldhighand  
theinputisatgroundorreversed. Undertheseconditions,  
only 16µA will flow from the output pin to ground. The  
devices are available in 5-lead TO-220, 5-lead DD and  
3-lead SOT-223 packages.  
Stable with 3.3µF Output Capacitor  
Reverse Battery Protection  
No Reverse Output Current  
Thermal Limiting  
Surface Mount SOT-223 and DD Packages  
U
APPLICATIO S  
Low Current Regulator  
Regulator for Battery-Powered Systems  
Post Regulator for Switching Supplies  
5V to 3.3V Logic Regulator  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
U
TYPICAL APPLICATIO  
5V Supply with Shutdown  
Dropout Voltage  
0.6  
5
1
2
5V OUT  
500mA  
IN  
OUT  
0.5  
0.4  
0.3  
+
LT1129-5  
SENSE  
GND  
3.3µF  
SOLID TANTALUM  
V
IN  
> 5.5V  
4
SHDN  
3
0.2  
0.1  
0
V
(PIN 4) OUTPUT  
SHDN  
< 0.25  
> 2.8  
NC  
OFF  
ON  
ON  
LT1129 • TA01  
0.4  
OUTPUT CURRENT (A)  
0.6  
0.7  
0
0.1  
0.2 0.3  
0.5  
LT1129 • TA02  
112935fc  
1
LT1129/LT1129-3.3/LT1129-5  
W W U W  
ABSOLUTE AXI U RATI GS  
(Note 1)  
Input Voltage ...................................................... ±30V*  
Output Pin Reverse Current ................................. 10mA  
Sense Pin Current................................................ 10mA  
Adjust Pin Current ............................................... 10mA  
Shutdown Pin Input Voltage (Note 2) ........ 6.5V, – 0.6V  
Shutdown Pin Input Current (Note 2) .................. 20mA  
Output Short-Circuit Duration......................... Indefinite  
Storage Temperature Range ................ – 65°C to 150°C  
Operating Junction Temperature Range (Note 2)  
LT1129C-X ......................................... 0°C to 125°C  
LT1129C-X Extended Temperature Range  
(Note 12) ........................................ –40°C to 125°C  
LT1129I-X ...................................... –40°C to 125°C  
Lead Temperature (Soldering, 10 sec).................. 300°C  
* For applications requiring input voltage ratings greater than 30V, contact the factory.  
U
W
U
PACKAGE/ORDER I FOR ATIO  
TOP VIEW  
FRONT VIEW  
TOP VIEW  
ORDER PART  
NUMBER  
5
4
3
2
1
V
IN  
1
2
3
4
8
7
6
5
V
IN  
OUTPUT  
SENSE/  
ADJ*  
1
2
GND  
GND  
GND  
GND  
GND  
GND  
IN  
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
GND  
GND  
GND  
GND  
GND  
GND  
OUT  
SHDN  
GND  
TAB  
LT1129CF-3.3  
IS  
GND  
3
GND  
GND  
GND  
SENSE/ADJ*  
OUTPUT  
4
NC  
SHDN  
5
S8 PACKAGE  
8-LEAD PLASTIC SO  
Q PACKAGE  
5-LEAD PLASTIC DD  
6
7
*PIN 2 = SENSE FOR LT1129-3.3/LT1129-5  
= ADJ FOR LT1129  
*PIN 2 = SENSE FOR LT1129-3.3/LT1129-5  
= ADJ FOR LT1129  
8
SHDN  
GND  
GND  
SENSE  
GND  
GND  
9
θJA 60°C/W  
θ
JA 30°C/ W  
10  
ORDER PART  
NUMBER  
ORDER PART  
NUMBER  
PART  
MARKING  
F PACKAGE  
20-LEAD PLASTIC TSSOP  
LT1129CQ  
LT1129CS8  
1129  
NOTE: ALL GROUND PINS ARE  
INTERNALLY CONNECTED  
LT1129CQ-3.3  
LT1129CQ-5  
LT1129IQ  
LT1129CS8-3.3  
LT1129CS8-5  
LT1129IS8  
11293  
11295  
1129I  
1129I3  
1129I5  
θ
JA 40°C/ W  
LT1129IQ-3.3  
LT1129IQ-5  
LT1129IS8-3.3  
LT1129IS8-5  
OBSOLETE PACKAGE  
FRONT VIEW  
FRONT VIEW  
ORDER PART  
NUMBER  
ORDER PART  
NUMBER  
5
4
3
2
1
V
IN  
3
2
1
OUTPUT  
GND  
SHDN  
TAB  
IS  
GND  
TAB  
IS  
GND  
LT1129CST-3.3  
LT1129CST-5  
LT1129IST-3.3  
LT1129IST-5  
LT1129CT  
GND  
LT1129CT-3.3  
LT1129CT-5  
LT1129IT  
SENSE/ADJ*  
OUTPUT  
V
IN  
LT1129IT-3.3  
LT1129IT-5  
ST PACKAGE  
3-LEAD PLASTIC SOT-223  
T PACKAGE  
5-LEAD PLASTIC TO-220  
θJA 50°C/ W  
*PIN 2 = SENSE FOR LT1129-3.3/LT1129-5  
= ADJ FOR LT1129  
θ
JA 50°C/W  
Consult factory for Military grade parts.  
112935fc  
2
LT1129/LT1129-3.3/LT1129-5  
ELECTRICAL CHARACTERISTICS  
The denotes the specifications which apply over the full operating  
temperature range, otherwise specifications are at TA = 25°C.  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
Regulated Output Voltage  
(Notes 4, 12)  
LT1129-3.3  
V
= 3.8V, I  
= 1mA, T = 25°C  
3.250  
3.200  
3.300  
3.300  
3.350  
3.400  
V
V
IN  
OUT  
J
4.3V < V < 20V, 1mA < I  
< 700mA  
IN  
OUT  
LT1129-5  
V
= 5.5V, I  
IN  
= 1mA, T = 25°C  
4.925  
4.850  
5.000  
5.000  
5.075  
5.150  
V
V
IN  
OUT  
J
6V < V < 20V, 1mA < I  
< 700mA  
OUT  
LT1129 (Note 5)  
V
= 4.3V, I  
= 1mA, T = 25°C  
3.695  
3.640  
3.750  
3.750  
3.805  
3.860  
V
V
IN  
OUT  
J
4.8V < V < 20V, 1mA < I  
< 700mA  
IN  
OUT  
Line Regulation (Note 12)  
Load Regulation (Note 12)  
LT1129-3.3  
LT1129-5  
V = 4.8V to 20V, I  
= 1mA  
= 1mA  
= 1mA  
1.5  
1.5  
1.5  
10  
10  
10  
mV  
mV  
mV  
IN  
OUT  
OUT  
OUT  
V = 5.5V to 20V, I  
IN  
LT1129 (Note 5)  
LT1129-3.3  
V = 4.3V to 20V, I  
IN  
I  
I  
= 1mA to 700mA, T = 25°C  
= 1mA to 700mA  
6
15  
20  
30  
mV  
mV  
LOAD  
LOAD  
J
LT1129-5  
I  
I  
= 1mA to 700mA, T = 25°C  
= 1mA to 700mA  
6
20  
20  
30  
mV  
mV  
LOAD  
LOAD  
J
LT1129 (Note 5)  
I  
I  
= 1mA to 700mA, T = 25°C  
= 1mA to 700mA  
6
15  
20  
30  
mV  
mV  
LOAD  
LOAD  
J
Dropout Voltage  
(Note 6)  
I
I
= 10mA, T = 25°C  
= 10mA  
0.13  
0.25  
0.37  
0.45  
0.20  
0.25  
V
V
LOAD  
LOAD  
J
I
I
= 100mA, T = 25°C  
= 100mA  
0.35  
0.45  
V
V
LOAD  
LOAD  
J
I
I
= 500mA, T = 25°C  
= 500mA  
0.45  
0.60  
V
V
LOAD  
LOAD  
J
I
I
= 700mA, T = 25°C  
= 700mA  
0.55  
0.70  
V
V
LOAD  
LOAD  
J
Ground Pin Current  
(Note 7)  
I
I
I
I
I
I
= 0mA  
50  
310  
2.0  
10  
70  
450  
3.5  
20  
µA  
µA  
LOAD  
LOAD  
LOAD  
LOAD  
LOAD  
LOAD  
= 10mA  
= 100mA  
= 300mA  
= 500mA  
= 700mA  
mA  
mA  
mA  
mA  
nA  
25  
45  
50  
90  
Adjust Pin Bias Current (Notes 5, 8) T = 25°C  
150  
300  
2.8  
J
Shutdown Threshold  
V
V
= Off to On  
= On to Off  
1.2  
0.75  
V
V
OUT  
OUT  
0.25  
52  
Shutdown Pin Current (Note 9)  
V
V
= 0V  
6
10  
25  
µA  
µA  
SHDN  
Quiescent Current in Shutdown  
(Note 10)  
= 6V, V  
= 0V  
SHDN  
15  
IN  
Ripple Rejection  
V
– V  
= 1V (Avg), V  
= 0.5V ,  
P-P  
64  
dB  
IN  
OUT  
RIPPLE  
f
= 120Hz, I = 0.7A, T = 25°C  
LOAD J  
RIPPLE  
Current Limit  
V
V
– V  
= 7V, T = 25°C  
1.2  
1.6  
1.0  
A
IN  
IN  
OUT  
J
Input Reverse Leakage Current  
Reverse Output Current (Note 11)  
= –20V, V  
= 0V  
mA  
OUT  
LT1129-3.3  
LT1129-5  
LT1129 (Note 5)  
V
V
V
= 3.3V, V = 0V  
16  
16  
16  
25  
25  
25  
µA  
µA  
µA  
OUT  
OUT  
OUT  
IN  
= 5V, V = 0V  
IN  
= 3.8V, V = 0V  
IN  
112935fc  
3
LT1129/LT1129-3.3/LT1129-5  
ELECTRICAL CHARACTERISTICS  
Note 1: Absolute Maximum Ratings are those values beyond which the life  
Note 6: Dropout voltage is the minimum input/output voltage required to  
of a device may be impaired.  
maintain regulation at the specified output current. In dropout the output  
voltage will be equal to (V – V ). Dropout voltage is measured  
Note 2: The shutdown pin input voltage rating is required for a low  
impedance source. Internal protection devices connected to the shutdown  
pin will turn on and clamp the pin to approximately 7V or 0.6V. This  
range allows the use of 5V logic devices to drive the pin directly. For high  
impedance sources or logic running on supply voltages greater than 5.5V,  
the maximum current driven into the shutdown pin must be limited to less  
than 20mA.  
IN  
DROPOUT  
between the input pin and the output pin. External voltage drops between  
the output pin and the sense pin will add to the dropout voltage.  
Note 7: Ground pin current is tested with V = V  
(nominal) and a  
IN  
OUT  
current source load. This means that the device is tested while operating  
in its dropout region. This is the worst case ground pin current. The  
ground pin current will decrease slightly at higher input voltages.  
Note 3: For junction temperatures greater than 110°C, a minimum load of  
Note 8: Adjust pin bias current flows into the adjust pin.  
1mA is recommended. For T > 110°C and I  
may increase by 1%.  
< 1mA, output voltage  
J
OUT  
Note 9: Shutdown pin current at V  
Note 10: Quiescent current in shutdown is equal to the sum total of the  
shutdown pin current (6µA) and the ground pin current (9µA).  
= 0V flows out of the shutdown pin.  
SHDN  
Note 4: Operating conditions are limited by maximum junction  
temperature. The regulated output voltage specification will not apply for  
all possible combinations of input voltage and output current. When  
operating at maximum input voltage, the output current range must be  
limited. When operating at maximum output current the input voltage  
range must be limited.  
Note 11: Reverse output current is tested with the input pin grounded. The  
output pin and the sense pin are forced to the rated output voltage. This  
current flows into the sense pin and out of the ground pin. For the LT1129  
(adjustable version) the sense pin is internally tied to the output pin.  
Note 12: For C-grade devices Regulated Output Voltage, Line Regulation,  
and Load Regulation are guaranteed over the extended temperature range  
of 40°C to 125°C. These parameters are not tested or quality assurance  
sampled at –40°C. They are guaranteed by design, correlation and/or  
inference from 25°C and/or 0°C tests.  
Note 5: The LT1129 is tested and specified with the adjust pin connected  
to the output pin.  
112935fc  
4
LT1129/LT1129-3.3/LT1129-5  
TYPICAL PERFOR A CE CHARACTERISTICS  
U W  
Guaranteed Dropout Voltage  
Quiescent Current  
Dropout Voltage  
0.7  
0.6  
0.5  
0.4  
0.3  
0.2  
0.1  
0
0.7  
0.6  
0.5  
0.4  
0.3  
0.2  
0.1  
0
70  
60  
50  
40  
30  
20  
10  
0
A. I  
B. I  
C. I  
D. I  
= 700mA  
= 500mA  
= 300mA  
= 100mA  
= 10mA  
LOAD  
LOAD  
LOAD  
LOAD  
LOAD  
A
B
T
125°C  
25°C  
J
V
= OPEN (HI)  
SHDN  
E. I  
T
C
D
J
E
V
= 0V  
50  
SHDN  
= TEST POINTS  
0.2 0.3 0.4  
0
0.5 0.6 0.7  
OUTPUT CURRENT (A)  
–50  
0
25  
50  
75 100 125  
–50  
0
25  
75 100 125  
0.1  
–25  
–25  
TEMPERATURE (°C)  
TEMPERATURE (°C)  
1129 G11  
1129 G02  
1129 G10  
LT1129-3.3  
Quiescent Current  
LT1129-5  
Quiescent Current  
LT1129  
Quiescent Current  
250  
225  
200  
175  
150  
125  
100  
75  
250  
225  
200  
175  
150  
125  
100  
75  
250  
225  
200  
175  
150  
125  
100  
75  
I
R
V
= 0  
I
= 0  
I
= 0  
LOAD  
LOAD  
LOAD  
=
R
=  
LOAD  
R
= ∞  
LOAD  
LOAD  
= V  
OUT  
ADJ  
V
= OPEN (HI)  
V
= OPEN (HI)  
V
= OPEN (HI)  
SHDN  
SHDN  
SHDN  
50  
50  
50  
V
= 0V  
V
= 0V  
V
= 0V  
6
25  
SHDN  
5
25  
SHDN  
5
25  
SHDN  
5
0
0
0
0
1
2
3
4
6
7
8
9
10  
0
1
2
3
4
6
7
8
9
10  
0
1
2
3
4
7
8
9
10  
INPUT VOLTAGE (V)  
INPUT VOLTAGE (V)  
INPUT VOLTAGE (V)  
1129 G13  
1129 G14  
1129 G12  
LT1129-3.3  
Output Voltage  
LT1129-5  
Output Voltage  
LT1129  
Adjust Pin Voltage  
3.400  
3.375  
3.350  
3.325  
3.300  
3.275  
3.250  
3.225  
3.200  
5.100  
5.075  
5.050  
5.025  
5.000  
4.975  
4.950  
4.925  
4.900  
3.850  
3.825  
3.800  
3.775  
3.750  
3.725  
3.700  
3.675  
3.650  
I
= 1mA  
I
= 1mA  
I
= 1mA  
LOAD  
LOAD  
LOAD  
–50  
0
25  
50  
75 100 125  
–50  
0
25  
50  
75 100 125  
–50  
0
25  
50  
75  
125  
–25  
–25  
–25  
100  
TEMPERATURE (°C)  
TEMPERATURE (°C)  
TEMPERATURE (°C)  
1129 G06  
1129 G04  
1129 G05  
112935fc  
5
LT1129/LT1129-3.3/LT1129-5  
U W  
TYPICAL PERFOR A CE CHARACTERISTICS  
LT1129-3.3  
Ground Pin Current  
LT1129-5  
Ground Pin Current  
LT1129  
Ground Pin Current  
2.0  
1.8  
1.6  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
0
2.0  
1.8  
1.6  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
0
2.0  
1.8  
1.6  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
0
T
V
V
= 25°C  
OUT  
SENSE  
T
= 25°C  
T
V
V
= 25°C  
OUT  
ADJ  
J
J
J
R
LOAD  
= 50  
LOAD  
=
V
= V  
=
OUT  
SENSE  
I
= 100mA*  
R
LOAD  
= 33Ω  
LOAD  
R
LOAD  
= 38Ω  
I
= 100mA*  
LOAD  
I
= 100mA*  
R = 100Ω  
LOAD  
I = 50mA*  
LOAD  
R
= 66Ω  
= 50mA*  
LOAD  
R
LOAD  
= 75Ω  
LOAD  
I
LOAD  
I
= 50mA*  
R
LOAD  
= 500Ω  
= 10mA*  
R
= 330Ω  
= 10mA*  
R
= 375Ω  
= 10mA*  
LOAD  
LOAD  
LOAD  
I
I
I
LOAD  
LOAD  
*For V  
3
= 3.3V  
*For V  
3
= 5V  
5
*For V  
3
= 3.75V  
OUT  
OUT  
OUT  
4
0
1
2
4
5
6
7
8
9
10  
0
1
2
4
6
7
8
9
10  
0
1
2
5
6
7
8
9
10  
INPUT VOLTAGE (V)  
INPUT VOLTAGE (V)  
INPUT VOLTAGE (V)  
1129 G18  
1129 G19  
1129 G20  
LT1129-3.3  
Ground Pin Current  
LT1129-5  
Ground Pin Current  
LT1129  
Ground Pin Current  
60  
50  
40  
30  
20  
10  
0
60  
50  
40  
30  
20  
10  
0
60  
50  
40  
30  
20  
10  
0
T
= 25°C  
T
V
= 25°C  
J
OUT  
T
= 25°C  
J
J
V
= V  
= V  
SENSE  
V
= V  
OUT  
SENSE  
OUT  
ADJ  
R
LOAD  
= 5.3  
LOAD  
R
LOAD  
= 7.1Ω  
I
I
= 700mA*  
LOAD  
R
LOAD  
= 4.7Ω  
I
I
= 700mA*  
LOAD  
I
= 700mA*  
R
LOAD  
= 10Ω  
= 500mA*  
LOAD  
R
LOAD  
= 6.6Ω  
= 500mA*  
R
LOAD  
= 7.5Ω  
LOAD  
= 500mA*  
LOAD  
I
R
LOAD  
= 11Ω  
R
= 16.6Ω  
= 300mA*  
R
= 12.6Ω  
LOAD  
LOAD  
LOAD  
I
= 300mA*  
I
I
= 300mA*  
LOAD  
LOAD  
*For V  
= 3.3V  
6
*For V  
4
= 5V  
*For V  
= 3.75V  
OUT  
5
OUT  
5
OUT  
5
0
2
4
8
10  
1
3
7
9
0
2
6
8
10  
0
2
4
6
8
10  
1
3
7
9
1
3
7
9
INPUT VOLTAGE (V)  
INPUT VOLTAGE (V)  
INPUT VOLTAGE (V)  
1129 G21  
1129 G22  
1129 G23  
Shutdown Pin Threshold  
(On-to-Off)  
Shutdown Pin Threshold  
(Off-to-On)  
Ground Pin Current  
70  
60  
50  
40  
30  
20  
10  
0
2.0  
1.8  
1.6  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
0
2.0  
1.8  
1.6  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
0
V
V
V
= 3.3V (LT1129-3.3)  
= 5V (LT1129-5)  
= 3.75V (LT1129)  
I
= 1mA  
IN  
IN  
IN  
LOAD  
I
I
= 700mA  
= 1mA  
LOAD  
DEVICE IS OPERATING  
IN DROPOUT  
T = 125°C  
J
LOAD  
T = 25°C  
J
T = –50°C  
J
50  
75 100 125  
–50 –25  
0
25  
50  
75 100 125  
0
0.2 0.3 0.4  
0.5 0.6 0.7  
–50 –25  
0
25  
0.1  
OUTPUT CURRENT (A)  
TEMPERATURE (°C)  
TEMPERATURE (°C)  
1129 G15  
1129 G27  
1129 G26  
112935fc  
6
LT1129/LT1129-3.3/LT1129-5  
TYPICAL PERFOR A CE CHARACTERISTICS  
U W  
Shutdown Pin Input Current  
Shutdown Pin Current  
Adjust Pin Bias Current  
10  
9
8
7
6
5
4
3
2
1
0
400  
350  
300  
250  
200  
150  
100  
50  
25  
20  
V
= 0V  
V
= V  
= 3.75V  
OUT  
SHDN  
ADJ  
15  
10  
5
0
0
50  
75 100 125  
–50  
–25  
0
25  
50  
75 100 125  
–50  
0
25  
–25  
7
0
1
2
3
4
5
6
8
9
TEMPERATURE (°C)  
TEMPERATURE (°C)  
SHUTDOWN PIN VOLTAGE (V)  
1129 G28  
1129 G25  
1129 G24  
Reverse Output Current  
Current Limit  
Current Limit  
30  
25  
20  
15  
10  
5
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
0
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
0
V
V
V
V
= 0V  
= V  
V
= 0V  
IN  
OUT  
= 5V (LT1129-5)  
OUT  
OUT  
OUT  
SENSE  
SENSE  
= V  
= V  
= 3.3V (LT1129-3.3)  
= 3.75V (LT1129)  
ADJ  
V
V
= 7V  
OUT  
IN  
= 0V  
0
–50  
0
25  
50  
75 100 125  
0
2
3
4
5
7
50  
–25  
1
6
–50  
0
25  
75 100 125  
–25  
TEMPERATURE (°C)  
INPUT VOLTAGE (V)  
TEMPERATURE (°C)  
1129 G29  
1129 G07  
1129 G08  
Reverse Output Current  
Ripple Rejection  
Ripple Rejection  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
70  
68  
66  
64  
62  
60  
58  
56  
I
= 500mA  
T
= 25°C, V = 0V  
OUT  
IN  
J
V
IN  
(V – V  
)AVG = 1V  
OUT  
IN  
V
= 6V + 50mV  
RIPPLE  
RMS  
= V  
OUT  
SENSE  
V
= 0.5V  
RIPPLE  
P-P  
(LT1129-3.3/LT1129-5)  
V
CURRENT FLOWS  
INTO DEVICE  
I
= 0.7A  
L
= V  
(LT1129)  
OUT  
ADJ  
C
= 47µF  
OUT  
SOLID  
TANTALUM  
LT1129  
LT1129-3.3  
C
= 3.3µF  
OUT  
SOLID  
TANTALUM  
LT1129-5  
10  
100  
1k  
10k  
100k  
1M  
0
2
4
6
8
10  
1
3
5
7
9
50  
–50  
0
25  
75 100 125  
–25  
FREQUENCY (Hz)  
TEMPERATURE (°C)  
OUTPUT VOLTAGE (V)  
1129 G01  
1129 G30  
1129 G03  
112935fc  
7
LT1129/LT1129-3.3/LT1129-5  
U W  
TYPICAL PERFOR A CE CHARACTERISTICS  
LT1129-5  
Transient Response  
LT1129-5  
Transient Response  
Load Regulation  
0
–5  
LT1129-3.3  
V
C
C
= 6V  
V
C
C
= 6V  
IN  
IN  
IN  
IN  
0.10  
0.05  
0
0.2  
0.1  
0
= 3.3µF  
= 47µF  
= 3.3µF  
= 3.3µF  
OUT  
OUT  
LT1129*  
–10  
–15  
–20  
–25  
–30  
–0.05  
–0.10  
–0.1  
–0.2  
0.7  
0.5  
0.3  
0.1  
LT1129-5  
V
I  
*V  
= V (NOMINAL) + 1V  
OUT  
IN  
0.6  
0.5  
= 1mA to 700mA  
LOAD  
= V  
ADJ  
OUT  
–50  
0
25  
50  
75 100 125  
0
50  
150 200 250 300 350 400 450 500  
0
0.2 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0  
0.4  
–25  
100  
TEMPERATURE (°C)  
TIME (µs)  
TIME (ms)  
1129 G09  
1129 G31  
1129 G32  
U
U
U
PI FU CTIO S  
Input Pin: Power is supplied to the device through the  
input pin. The input pin should be bypassed to ground if  
the device is more than 6 inches away from the main input  
filter capacitor. In general, the output impedance of a  
battery rises with frequency so it is advisable to include a  
bypass capacitor in battery-powered circuits. A bypass  
capacitor in the range of 1µF to 10µF is sufficient. The  
LT1129 is designed to withstand reverse voltages on the  
input pin with respect to both ground and the output pin.  
In the case of a reversed input, which can happen if a  
battery is plugged in backwards, the LT1129 will act as if  
there is a diode in series with its input. There will be no  
reverse current flow into the LT1129 and no reverse  
voltage will appear at the load. The device will protect both  
itself and the load.  
6µA. The shutdown pin is internally clamped to 7V and –  
0.6V (one VBE). This allows the shutdown pin to be driven  
directly by 5V logic or by open collector logic with a pull-  
up resistor. The pull-up resistor is only required to supply  
the leakage current of the open collector gate, normally  
several microamperes. Pull-up current must be limited to  
a maximum of 20mA. A curve of shutdown pin input  
current as a function of voltage appears in the Typical  
Performance Characteristics. If the shutdown pin is not  
used it can be left open circuit. The device will be active,  
output on, if the shutdown pin is not connected.  
Sense Pin: For fixed voltage versions of the LT1129  
(LT1129-3.3, LT1129-5) the sense pin is the input to the  
error amplifier. Optimum regulation will be obtained at the  
point where the sense pin is connected to the output pin.  
For most applications the sense pin is connected directly  
to the output pin at the regulator. In critical applications  
small voltage drops caused by the resistance (RP) of PC  
traces between the regulator and the load, which would  
normally degrade regulation, may be eliminated by con-  
nectingthesensepintotheoutputpinattheloadasshown  
in Figure 1 (Kelvin Sense Connection). Note that the  
voltage drop across the external PC traces will add to the  
dropout voltage of the regulator. The sense pin bias  
current is 15µA at the nominal regulated output voltage.  
Output Pin: The output pin supplies power to the load. An  
output capacitor is required to prevent oscillations. See  
the Applications Information section for recommended  
value of output capacitance and information on reverse  
output characteristics.  
Shutdown Pin (SHDN): This pin is used to put the device  
into shutdown. In shutdown the output of the device is  
turned off. This pin is active low. The device will be shut  
down if the shutdown pin is actively pulled low. The  
shutdown pin current with the pin pulled to ground will be  
This pin is internally clamped to 0.6V (one VBE).  
112935fc  
8
LT1129/LT1129-3.3/LT1129-5  
U
U
U
PI FU CTIO S  
AdjustPin: FortheLT1129(adjustableversion)theadjust  
pin is the input to the error amplifier. This pin is internally  
clamped to 6V and 0.6V (one VBE). This pin has a bias  
currentof150nAwhichflowsintothepin.SeeBiasCurrent  
curve in the Typical Performance Characteristics. The  
adjust pin reference voltage is equal to 3.75V referenced  
to ground.  
R
P
IN  
OUT  
LT1129  
1µF  
LOAD  
SHDN  
SENSE  
+
10µF  
GND  
R
P
LT1129 • F01  
Figure 1. Kelvin Sense Connection  
U
W
U U  
APPLICATIO S I FOR ATIO  
Performance Characteristics. The reference voltage at the  
adjust pin has a positive temperature coefficient of ap-  
proximately 15ppm/°C. The adjust pin bias current has a  
negative temperature coefficient. These effects are small  
and will tend to cancel each other.  
The LT1129 is a micropower low dropout regulator with  
shutdown, capable of supplying 700mA of output current  
at a dropout voltage of 0.4V. The device operates with very  
low quiescent current (50µA). In shutdown the quiescent  
current drops to only 16µA. In addition to the low quies-  
cent current the LT1129 incorporates several protection  
features which make it ideal for use in battery-powered  
systems. The device is protected against reverse input  
voltages. In battery backup applications where the output  
canbeheldupbyabackupbatterywhentheinputispulled  
to ground, the LT1129 acts like it has a diode in series with  
its output and prevents reverse current flow.  
The adjustable device is specified with the adjust pin tied  
to the output pin. This sets the output voltage to 3.75V.  
Specifications for output voltages greater than 3.75V will  
be proportional to the ratio of the desired output voltage to  
3.75V (VOUT/3.75V). For example: load regulation for an  
output current change of 1mA to 700mA is 6mV typical  
at VOUT = 3.75V. At VOUT = 12V, load regulation would be:  
Adjustable Operation  
12V  
3.75V  
6mV = –19mV  
(
) (  
)
The adjustable version of the LT1129 has an output  
voltage range of 3.75V to 30V. The output voltage is set by  
theratiooftwoexternalresistorsasshowninFigure2.The  
device servos the output voltage to maintain the voltage at  
the adjust pin at 3.75V. The current in R1 is then equal to  
3.75V/R1. The current in R2 is equal to the sum of the  
currentinR1andtheadjustpinbiascurrent.Theadjustpin  
bias current, 150nA at 25°C, flows through R2 into the  
adjust pin. The output voltage can be calculated according  
to the formula in Figure 2. The value of R1 should be less  
than 400k to minimize errors in the output voltage caused  
by the adjust pin bias current. Note that in shutdown the  
output is turned off and the divider current will be zero.  
Curves of Adjust Pin Voltage vs Temperature and Adjust  
Pin Bias Current vs Temperature appear in the Typical  
V
IN  
OUT  
ADJ  
OUT  
LT1129  
R2  
R1  
+
SHDN  
GND  
R2  
LT1129 • F02  
V
V
= 3.75V 1 +  
+ I  
(
• R2  
ADJ  
)
OUT  
(
)
R1  
= 3.75V  
ADJ  
I
= 150nA at 25°C  
ADJ  
OUTPUT RANGE = 3.75V to 30V  
Figure 2. Adjustable Operation  
112935fc  
9
LT1129/LT1129-3.3/LT1129-5  
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APPLICATIO S I FOR ATIO  
Thermal Considerations  
copper. This data can be used as a rough guideline in  
estimating thermal resistance. The thermal resistance for  
each application will be affected by thermal interactions  
with other components as well as board size and shape.  
Some experimentation will be necessary to determine the  
actual value.  
The power handling capability of the device will be limited  
by the maximum rated junction temperature (125°C). The  
power dissipated by the device will be made up of two  
components:  
1. Output current multiplied by the input/output voltage  
differential: IOUT • (VIN – VOUT), and  
Table 1. Q Package, 5-Lead DD  
COPPER AREA  
TOPSIDE* BACKSIDE  
THERMAL RESISTANCE  
(JUNCTION-TO-AMBIENT)  
2. Ground pin current multiplied by the input voltage:  
IGND • VIN.  
BOARD AREA  
2500 sq. mm 2500 sq. mm 2500 sq. mm  
1000 sq. mm 2500 sq. mm 2500 sq. mm  
125 sq. mm 2500 sq. mm 2500 sq. mm  
* Tab of device attached to topside copper  
25°C/W  
27°C/W  
35°C/W  
The ground pin current can be found by examining the  
Ground Pin Current curves in the Typical Performance  
Characteristics. Powerdissipationwillbeequaltothesum  
of the two components listed above.  
Table 2. ST Package, 3-Lead SOT-223  
COPPER AREA  
The LT1129 series regulators have internal thermal limit-  
ing designed to protect the device during overload condi-  
tions. For continuous normal load conditions the maxi-  
mum junction temperature rating of 125°C must not be  
exceeded. It is important to give careful consideration to  
allsourcesofthermalresistancefromjunctiontoambient.  
Additional heat sources mounted nearby must also be  
considered.  
THERMAL RESISTANCE  
TOPSIDE*  
BACKSIDE  
BOARD AREA (JUNCTION-TO-AMBIENT)  
2500 sq. mm 2500 sq. mm 2500 sq. mm  
1000 sq. mm 2500 sq. mm 2500 sq. mm  
225 sq. mm 2500 sq. mm 2500 sq. mm  
100 sq. mm 2500 sq. mm 2500 sq. mm  
* Tab of device attached to topside copper  
45°C/W  
45°C/W  
53°C/W  
59°C/W  
For surface mount devices heat sinking is accomplished  
by using the heat spreading capabilities of the PC board  
and its copper traces. Experiments have shown that the  
heat spreading copper layer does not need to be electri-  
cally connected to the tab of the device. The PC material  
can be very effective at transmitting heat between the pad  
area, attached to the tab of the device, and a ground or  
power plane layer either inside or on the opposite side of  
theboard.AlthoughtheactualthermalresistanceofthePC  
material is high, the length/area ratio of the thermal  
resistor between layers is small. Copper board stiffeners  
and plated through holes can also be used to spread the  
heat generated by power devices.  
Table 3. S8 Package, 8-Lead Plastic SOIC  
COPPER AREA  
THERMAL RESISTANCE  
(JUNCTION-TO-AMBIENT)  
BOARD AREA  
TOPSIDE*  
BACKSIDE  
2500 sq. mm 2500 sq. mm 2500 sq. mm  
1000 sq. mm 2500 sq. mm 2500 sq. mm  
225 sq. mm 2500 sq. mm 2500 sq. mm  
100 sq. mm 2500 sq. mm 2500 sq. mm  
* Device attached to topside copper  
55°C/W  
55°C/W  
63°C/W  
69°C/W  
T Package, 5-Lead TO-220  
Thermal Resistance (Junction-to-Case) = 5°C/W  
The following tables list thermal resistances for each  
package. For the TO-220 package, thermal resistance is  
given for junction-to-case only since this package is  
usually mounted to a heat sink. Measured values of  
thermal resistance for several different board sizes and  
copper areas are listed for each package. All measure-  
ments were taken in still air on 3/32" FR-4 board with 1-oz  
112935fc  
10  
LT1129/LT1129-3.3/LT1129-5  
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APPLICATIO S I FOR ATIO  
Calculating Junction Temperature  
Protection Features  
Example: Given an output voltage of 3.3V, an input voltage  
range of 4.5V to 5.5V, an output current range of 0mA to  
500mA, and a maximum ambient temperature of 50°C,  
what will the maximum junction temperature be?  
TheLT1129incorporatesseveralprotectionfeatureswhich  
make it ideal for use in battery-powered circuits. In addi-  
tion to the normal protection features associated with  
monolithic regulators, such as current limiting and ther-  
mal limiting, the device is protected against reverse input  
voltages, and reverse voltages from output to input. For  
fixed voltage devices the output and sense pins are tied  
together at the output.  
The power dissipated by the device will be equal to:  
IOUT MAX • (VIN MAX – VOUT) + (IGND • VIN MAX)  
where, IOUT MAX = 500mA  
VIN MAX = 5.5V  
Current limit protection and thermal overload protection  
areintendedtoprotectthedeviceagainstcurrentoverload  
conditions at the output of the device. For normal opera-  
tion, the junction temperature should not exceed 125°C.  
IGND at (IOUT = 500mA, VIN = 5.5V) = 25mA  
so,  
P = 500mA • (5.5V – 3.3V) + (25mA • 5.5V)  
= 1.24W  
The input of the device will withstand reverse voltages of  
30V.Currentflowintothedevicewillbelimitedtolessthan  
1mA (typically less than 100µA) and no negative voltage  
will appear at the output. The device will protect both itself  
and the load. This provides protection against batteries  
that can be plugged in backwards.  
If we use a DD package, then the thermal resistance will be  
in the range of 25°C/W to 35°C/W depending on copper  
area. So the junction temperature rise above ambient will  
be approximately equal to:  
1.24W • 30°C/W = 37.2°C  
The maximum junction temperature will then be equal to  
the maximum junction temperature rise above ambient  
plus the maximum ambient temperature or:  
For fixed voltage versions of the device, the sense pin is  
internally clamped to one diode drop below ground. For  
the adjustable version of the device, the output pin is  
internally clamped at one diode drop below ground. If the  
output pin of an adjustable device, or the sense pin of a  
fixedvoltagedevice, ispulledbelowground, withtheinput  
open or grounded, current must be limited to less than  
5mA.  
TJMAX = 50°C + 37.2°C = 87.2°C  
Output Capacitance and Transient Performance  
The LT1129 is designed to be stable with a wide range of  
output capacitors. The minimum recommended value is  
3.3µF with an ESR of 2or less. The LT1129 is a  
micropower device and output transient response will be  
a function of output capacitance. See the Transient Re-  
sponsecurvesintheTypicalPerformanceCharacteristics.  
Larger values of output capacitance will decrease the peak  
deviations and provide improved output transient re-  
sponse. Bypass capacitors, used to decouple individual  
components powered by the LT1129, will increase the  
effective value of the output capacitor.  
In circuits where a backup battery is required, several  
different input/output conditions can occur. The output  
voltage may be held up while the input is either pulled to  
ground, pulled to some intermediate voltage, or is left  
open circuit. Current flow back into the output will vary  
depending on the conditions. Many battery-powered cir-  
cuits incorporate some form of power management. The  
followinginformationwillhelpoptimizebatterylife.Table 3  
summarizes the following information.  
The reverse output current will follow the curve in Figure 3  
when the input pin is pulled to ground. This current flows  
through the output pin to ground. The state of the shut-  
down pin will have no effect on output current when the  
input pin is pulled to ground.  
112935fc  
11  
LT1129/LT1129-3.3/LT1129-5  
U U  
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APPLICATIO S I FOR ATIO  
Insomeapplicationsitmaybenecessarytoleavetheinput  
to the LT1129 unconnected when the output is held high.  
This can happen when the LT1129 is powered from a  
rectified AC source. If the AC source is removed, then the  
input of the LT1129 is effectively left floating. The reverse  
outputcurrentalsofollowsthecurveinFigure3iftheinput  
pin is left open. The state of the shutdown pin will have no  
effect on the reverse output current when the input pin is  
floating.  
When the input of the LT1129 is forced to a voltage below  
its nominal output voltage and its output is held high, the  
reverse output current will still follow the curve shown in  
Figure 3. This can happen if the input of the LT1129 is  
connected to a discharged (low voltage) battery and the  
output is held up by either a backup battery or by a second  
regulator circuit.  
When the input pin is forced below the output pin or the  
output pin is pulled above the input pin, the input current  
will typically drop to less than 2µA (see Figure 4). The state  
of the shutdown pin will have no effect on the reverse  
output current when the output is pulled above the input.  
100  
5
T
= 25°C  
J
V
V
= 3.3V (LT1129-3.3)  
= 5V (LT1129-5)  
OUT  
OUT  
90  
80  
V
= 0V  
IN  
SENSE  
V
= V  
OUT  
4
3
2
1
0
CURRENT FLOWS  
70 INTO DEVICE  
60  
50  
40  
30  
20  
10  
0
LT1129  
LT1129-3.3  
LT1129-5  
0
2
4
6
8
10  
1
3
1
3
5
7
9
0
2
4
5
OUTPUT VOLTAGE (V)  
INPUT VOLTAGE (V)  
1129 F03  
1129 F04  
Figure 3. Reverse Output Current  
Figure 4. Input Current  
Table 4. Fault Conditions  
INPUT PIN  
SHDN PIN  
OUTPUT PIN  
< V  
(Nominal)  
Open (Hi)  
Forced to V  
(Nominal)  
Reverse Output Current 15µA (See Figure 3)  
Input Current 1µA (See Figure 4)  
OUT  
OUT  
< V  
(Nominal)  
Grounded  
Forced to V  
(Nominal)  
Reverse Output Current 15µA (See Figure 3)  
Input Current 1µA (See Figure 4)  
OUT  
OUT  
Open  
Open  
Open (Hi)  
Grounded  
Forced to V  
Forced to V  
(Nominal)  
(Nominal)  
Reverse Output Current 15µA (See Figure 3)  
Reverse Output Current 15µA (See Figure 3)  
OUT  
OUT  
112935fc  
12  
LT1129/LT1129-3.3/LT1129-5  
U
PACKAGE DESCRIPTIO  
F Package  
20-Lead Plastic TSSOP (4.4mm)  
(LTC DWG # 05-08-1650)  
6.40 – 6.60*  
(.252 – .260)  
1.05 ±0.10  
4.50 ±0.10  
20 19 18 17 16 15 14 13 12 11  
6.60 ±0.10  
6.40  
(.252)  
BSC  
0.45 ±0.05  
0.65 BSC  
5
7
8
1
2
3
4
6
9 10  
RECOMMENDED SOLDER PAD LAYOUT  
1.10  
(.0433)  
MAX  
4.30 – 4.50**  
(.169 – .177)  
0.25  
REF  
0° – 8°  
0.65  
(.0256)  
BSC  
0.09 – 0.20  
0.50 – 0.75  
0.05 – 0.15  
(.0035 – .0079)  
(.020 – .030)  
(.002 – .006)  
0.19 – 0.30  
(.0075 – .0118)  
TYP  
F20 TSSOP 0204  
NOTE:  
1. CONTROLLING DIMENSION: MILLIMETERS  
MILLIMETERS  
2. DIMENSIONS ARE IN  
(INCHES)  
3. DRAWING NOT TO SCALE  
*DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH  
SHALL NOT EXCEED .152mm (.006") PER SIDE  
OBSOLETE PACKAGE  
112935fc  
13  
LT1129/LT1129-3.3/LT1129-5  
U
PACKAGE DESCRIPTIO  
Q Package  
5-Lead Plastic DD Pak  
(LTC DWG # 05-08-1461)  
.060  
(1.524)  
TYP  
.390 – .415  
(9.906 – 10.541)  
.060  
(1.524)  
.165 – .180  
(4.191 – 4.572)  
.256  
(6.502)  
.045 – .055  
(1.143 – 1.397)  
15° TYP  
+.008  
.004  
–.004  
.060  
(1.524)  
.059  
(1.499)  
TYP  
.183  
(4.648)  
.330 – .370  
(8.382 – 9.398)  
+0.203  
–0.102  
0.102  
(
)
.095 – .115  
(2.413 – 2.921)  
.075  
(1.905)  
.067  
(1.702)  
BSC  
.050 ± .012  
(1.270 ± 0.305)  
.300  
(7.620)  
.013 – .023  
(0.330 – 0.584)  
+.012  
.143  
–.020  
.028 – .038  
+0.305  
BOTTOM VIEW OF DD PAK  
HATCHED AREA IS SOLDER PLATED  
COPPER HEAT SINK  
3.632  
Q(DD5) 0502  
(0.711 – 0.965)  
(
)
–0.508  
TYP  
.420  
.276  
.080  
.420  
.350  
.325  
.205  
.565  
.565  
.320  
.090  
.042  
.090  
.042  
.067  
.067  
RECOMMENDED SOLDER PAD LAYOUT  
NOTE:  
RECOMMENDED SOLDER PAD LAYOUT  
FOR THICKER SOLDER PASTE APPLICATIONS  
1. DIMENSIONS IN INCH/(MILLIMETER)  
2. DRAWING NOT TO SCALE  
112935fc  
14  
LT1129/LT1129-3.3/LT1129-5  
U
PACKAGE DESCRIPTIO  
S8 Package  
8-Lead Plastic Small Outline (Narrow 0.150)  
(LTC DWG # 05-08-1610)  
.189 – .197  
(4.801 – 5.004)  
NOTE 3  
.045 ±.005  
.050 BSC  
7
5
8
6
.053 – .069  
(1.346 – 1.752)  
.004 – .010  
(0.101 – 0.254)  
.245  
MIN  
.150 – .157  
(3.810 – 3.988)  
NOTE 3  
.160 ±.005  
.228 – .244  
(5.791 – 6.197)  
.050  
(1.270)  
BSC  
.014 – .019  
(0.355 – 0.483)  
TYP  
.010 – .020  
(0.254 – 0.508)  
.030 ±.005  
× 45°  
1
3
4
2
TYP  
RECOMMENDED SOLDER PAD LAYOUT  
.008 – .010  
(0.203 – 0.254)  
0°– 8° TYP  
NOTE:  
INCHES  
(MILLIMETERS)  
1. DIMENSIONS IN  
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.  
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)  
.016 – .050  
2. DRAWING NOT TO SCALE  
(0.406 – 1.270)  
SO8 0303  
ST Package  
3-Lead Plastic SOT-223  
(LTC DWG # 05-08-1630)  
.248 – .264  
(6.30 – 6.71)  
.129 MAX  
.114 – .124  
(2.90 – 3.15)  
.059 MAX  
.264 – .287  
(6.70 – 7.30)  
.248 BSC  
.130 – .146  
(3.30 – 3.71)  
.039 MAX  
.059 MAX  
.090  
BSC  
.181 MAX  
.033 – .041  
(0.84 – 1.04)  
.0905  
(2.30)  
BSC  
RECOMMENDED SOLDER PAD LAYOUT  
10° – 16°  
.010 – .014  
10°  
MAX  
.071  
(1.80)  
MAX  
(0.25 – 0.36)  
10° – 16°  
.0008 – .0040  
(0.0203 – 0.1016)  
.024 – .033  
(0.60 – 0.84)  
.012  
(0.31)  
MIN  
.181  
(4.60)  
BSC  
ST3 (SOT-233) 0502  
112935fc  
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.  
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-  
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.  
15  
LT1129/LT1129-3.3/LT1129-5  
U
TYPICAL APPLICATIO  
T Package  
5-Lead Plastic TO-220 (Standard)  
(LTC DWG # 05-08-1421)  
.165 – .180  
(4.191 – 4.572)  
.147 – .155  
(3.734 – 3.937)  
DIA  
.390 – .415  
(9.906 – 10.541)  
.045 – .055  
(1.143 – 1.397)  
.230 – .270  
(5.842 – 6.858)  
.570 – .620  
(14.478 – 15.748)  
.620  
(15.75)  
TYP  
.460 – .500  
(11.684 – 12.700)  
.330 – .370  
(8.382 – 9.398)  
.700 – .728  
(17.78 – 18.491)  
.095 – .115  
(2.413 – 2.921)  
SEATING PLANE  
.152 – .202  
(3.861 – 5.131)  
.155 – .195*  
(3.937 – 4.953)  
.260 – .320  
(6.60 – 8.13)  
.013 – .023  
(0.330 – 0.584)  
.067  
BSC  
.135 – .165  
(3.429 – 4.191)  
.028 – .038  
(0.711 – 0.965)  
(1.70)  
* MEASURED AT THE SEATING PLANE  
T5 (TO-220) 0801  
RELATED PARTS  
PART NUMBER  
DESCRIPTION  
COMMENTS  
30µA I , SOT-223 Package  
LT1121  
150mA LDO Micropower Regulator  
Q
LT1761  
100mA Low Noise, LDO Micropower Regulator  
150mA Low Noise, LDO Micropower Regulator  
300mA Low Noise, LDO Micropower Regulator  
500mA Low Noise, LDO Micropower Regulator  
1.5A Low Noise, Fast Transient, LDO Regulator  
3A Low Noise, Fast Transient, LDO Regulator  
20µA I , 20µV  
Noise  
Noise  
Noise  
Noise  
Q
RMS  
RMS  
RMS  
RMS  
LT1762  
25µA I , 20µV  
Q
LT1962  
30µA I , 20µV  
Q
LT1763  
30µA I , 20µV  
Q
LT1963  
340mV Dropout Voltage, 40µV  
340mV Dropout Voltage, 40µV  
Noise  
Noise  
RMS  
RMS  
LT1764  
112935fc  
LT/TP 0205 1K REV C • PRINTED IN USA  
16 LinearTechnology Corporation  
1630 McCarthy Blvd., Milpitas, CA 95035-7417  
©LINEAR TECHNOLOGY CORPORATION 1994  
(408) 432-1900 FAX: (408) 434-0507 www.linear.com  
配单直通车
1129421001产品参数
型号:1129421001
生命周期:Active
Reach Compliance Code:compliant
ECCN代码:EAR99
Factory Lead Time:10 weeks
风险等级:5.68
主体宽度:11.2 mm
主体高度:56 mm
主体长度或直径:70 mm
最大线圈电流(直流):8 A
线圈工作电压(直流):10.8 V
线圈功率:450 mW
线圈释放电压(直流):10.8 V
线圈电阻:1.5 Ω
最大线圈电压(直流):12 V
线圈/输入电源类型:DC
触点(交流)最大额定R负载:8A@250VAC
最大触点电流(交流):8 A
最大触点电压(交流):250 V
触点/输出电源类型:AC
电气寿命:500000 Cycle(s)
安装特点:THROUGH HOLE-STRAIGHT MOUNT
工作时间:11 ms
最高工作温度:40 °C
最低工作温度:-25 °C
物理尺寸:70mm x 11.2mm x 56mm
参考标准:CE
继电器动作:MOMENTARY
继电器功能:SPST
继电器类型:POWER/SIGNAL RELAY
释放时间:10 ms
密封:IP20
表面贴装:NO
端接类型:SOLDER
Base Number Matches:1
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