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产品型号LMC2626的Datasheet PDF文件预览

PRELIMINARY  
November 1995  
LMC2626  
CMOS LDOR/Buffer Chip for Row  
Inversion Flat Panel Display Systems  
General Description  
Features  
Y
Used in conjunction with LM2625 chip  
High output current buffer  
The LMC2626 integrated circuit is specifically developed for  
a row inversion TFT FPD system architecture. It is designed  
only to be used in conjunction with National’s LM2625  
switching regulator chip.  
Y
Y
Y
Y
Y
Y
Y
Y
Low buffer on resistance  
System shutdown control  
Built on National’s advanced CMOS CS80 process, this chip  
generates a high-power, precision square-wave from a digi-  
tal sync signal. The chip also contains thermal shutdown  
circuitry, system shutdown circuitry, and a low drop-out volt-  
age regulator to generate a 4.2 volt supply from an external-  
ly applied reference voltage of 1.227V.  
LDO voltage regulator  
LDOR dropout 0.3V maximum at 150 mA  
Thermal shutdown/short circuit protection  
External reference required for LDOR  
V
REF  
pin converts to a digital pin to shutdown LM2625  
Connection Diagram  
Pin Description  
8-Pin SO  
Ý
Pin  
Pin Name  
Description  
1
V
REF  
1.218V to 1.242V Ext. Reference  
from LM2625 (see Note 8)  
2
3
SD  
System Shutdown input pin for  
LMC2626 and LMC2625  
SYNC  
Digital input square wave from FPD  
controller  
4
5
6
7
GND  
P5V  
Ground  
a
Precision Regulated 5V Supply  
V
Power Buffer Output  
OUT  
IN  
a
FPD System Supply ( 4.5V to  
V
a
5.5V)  
8
V
SH  
Low Drop-Out Voltage Regulator  
Output  
TL/H/12541–1  
Top View  
Ordering Information  
Temperature Range  
b
NSC  
Transport  
Media  
Package  
a
40 C to 85 C  
Drawing  
§
§
8-Pin SO  
LMC2626IM  
M08A  
Rail  
Tape and  
Reel  
C
1996 National Semiconductor Corporation  
TL/H/12541  
RRD-B30M26/Printed in U. S. A.  
Absolute Maximum Ratings (Note 1)  
ESD Tolerance 2 kV HBM, 200V MM (Note 4)  
Sync Input Voltage  
Operating Ratings (Note 1)  
s
s
5.5V  
V
Supply Voltage  
4.5V  
V
IN  
IN  
s s  
4.8V P5V 5.2V  
P5V  
P5V Supply Voltage (Note 5)  
Junction Temperature Range  
Ambient Temperature Range  
b a  
25 C to 125 C  
Supply Voltage (V , P5V)  
IN  
6.3V  
§
40 C to 85 C  
§
b
a
Continuous Total Power Dissipation (Note 1)  
§
§
Lead Temperature (less than 10 sec)  
Storage Temperature Range  
Junction Temperature  
260 C  
§
b
a
65 C to 150 C  
§
§
150 C  
§
DC Electrical Characteristics  
Unless otherwise specified, all limits guaranteed for 20 C  
s
s
s
s
V 5.5V, V  
IN  
b
a
e
e
1.227V  
REF  
T
A
85 C, P5V  
§
5V and 4.5V  
§
k
e
e
5V  
SYNC(OPEN), SD(OPEN)  
P5V  
V
IN  
VSH LDO Voltage Regulator (Notes 7, 10, 11)  
Typ  
Symbol  
Parameter  
Conditions  
Min  
Max  
Units  
V
(Note 9)  
e
V
V
Voltage Level  
SD  
0V  
O(VREF)  
REF  
e b  
5V  
in Shutdown  
I
1 mA  
4.00  
4.76  
VREF  
e
V
IN  
I
DC Current from  
VREF  
b
b
b
5
40.0  
13.3  
mA  
V
V
Pin  
REF  
Output Voltage on  
Pin (see Note 2)  
s
s
5.5V  
V
4.5V  
V
SH  
IN  
s
s
20 mA IL 150 mA  
V
4.10  
4.20  
4.30  
126  
SH  
s
s
1.218  
V
1.242  
REF  
s
V
IN  
s
DV  
Variation of V over  
SH  
4.5V  
5.5V  
SH  
4
mV  
s s  
20 mA IL 150 mA  
Temperature  
e
150 mA  
V
LDOR Voltage Dropout  
IL  
DO  
0.17  
394  
0.30  
500  
V
(V V  
IN  
)
SH  
Supply Current  
IN  
I
V
230  
mA  
S(VIN)  
s
s
5.5V  
Load Regulation of LDO  
Voltage Regulation  
4.5V  
V
IN  
0.002  
0.015  
0.95  
%/mA  
s
s
20 mA IL 150 mA  
s
s
5.5V  
Line Regulation of LDOR  
4.5V  
V
IN  
0.24  
160  
%/V  
s
s
20 mA IL 150 mA  
T
SD  
Thermal Shutdown  
Threshold  
(see Note 8)  
C
§
I
Output Load Current  
(see Note 2)  
300  
mA  
OUT  
Shutdown Control (Note 8)  
Symbol Parameter  
Typ  
(Note 9)  
Conditions  
Min  
Max  
Units  
mA  
e
e
I
Low Level Input Current  
for SD Pin  
V
5V  
0V  
IL(SD)  
IN  
b
b
b
300  
217  
150  
1000  
400  
SD  
e
I
I
High Level Input Current  
for SD Pin  
SD  
5V  
IH(SD)  
s(SD)  
310  
nA  
V
IN  
Supply Current  
180  
285  
20  
mA  
in Shutdown Mode  
e
C
Input Capacitance  
SYNC  
5V  
in(SYNC)  
pF  
e
27 C  
at SYNC Pin (Note 6)  
T
A
§
2
DC Electrical Characteristics  
Unless otherwise specified, all limits guaranteed for 20 C  
s
s
s
s
V 5.5V, V  
IN  
b
5V (Continued)  
a
e
e
1.227V  
REF  
T
A
85 C, P5V  
§
5V and 4.5V  
§
k
e
e
SYNC(OPEN), SD(OPEN)  
P5V  
V
IN  
Buffer  
Typ  
Symbol  
Parameter  
Peak to Peak Output  
Conditions  
Min  
Max  
Units  
V
(Note 9)  
e
(no load)  
V
V
V
SYNC  
5V  
pp  
OUT  
4.997  
4.999  
Voltage Swing or V  
OUT  
e
(No Load)  
Low Level Output  
Voltage  
SYNC  
0V  
OL  
0.2  
4.999  
1
2
mV  
V
e
5V  
High Level Output  
Voltage  
SYNC  
OH  
(No Load)  
D
Variation of V  
OUT  
VOUT  
IH  
0.2  
3.5  
3
mV  
V
Over Temperature  
V
High Level Input  
Voltage  
5
SYNC, SD  
V
Low Level Input  
Voltage  
IL  
SYNC, SD  
0
1.5  
1000  
275  
100  
1.5  
V
e
0V  
I
I
I
Low Level Input  
SYNC  
IL(SYNC)  
IH(SYNC)  
OUT-AVE  
5.0  
42  
nA  
mA  
mA  
X
Current for SYNC  
e
5V  
High Level Input  
Current for SYNC  
SYNC  
SYNC  
DC  
PP  
170  
215  
e
5V  
V
OUT  
Maximum Average  
Load Current from (see Note 2)  
e
150 mA  
R
On Resistance  
IL  
T
ON  
N-Channel  
0.9  
0.7  
e
27 C  
§
A
e
R
On Resistance  
On Resistance  
IL  
T
150 mA  
ON  
P-Channel  
1.2  
X
e
27 C  
§
A
e
R
IL  
T
150 mA  
ON  
Matching  
0.18  
355  
0.6  
X
e
27 C  
§
A
I
Supply Current  
from P5V  
No SYNC  
s
200  
950  
mA  
3
AC Electrical Characteristics  
Unless otherwise specified, all limits guaranteed for T  
e
circuit. Conditions that deviate from those shown in the test circuit are listed in the conditions column.  
e e  
IN  
e
P5V 5V. Other conditions are shown in the test  
27 C, V  
§
A
Typ  
Symbol  
Parameter  
Conditions  
Min  
Max  
Units  
(Note 9)  
t
Settling Time for V  
To 98% p-p V ,  
OUT  
s(OUT)  
OUT  
5.0  
ms  
e
V
5V (see Note 3)  
IN  
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions the device is intended  
to be functional, but device parameter specifications may not be guaranteed under these conditions. For guaranteed specifications and test conditions, see  
the Electrical Characteristics.  
Note 2: The typical junction-ambient thermal resistance of the molded plastic SO(M) package is 155 C/W. Therefore the maximum current for the buffer and  
§
voltage regulator are limited to the maximum total power dissipation that the package can allow in order to keep the die comfortably below the maximum  
operating junction temperature of 125 C.  
§
Note 3: The settling time of the Power Buffer is mostly dependent upon the TFT effective series RC load. The measurement of the settling time is taken for the  
e
e
0.22 mF).  
application when driving an all black display. The number in the datasheet reflects a series RC load (R  
6.8X and C  
Note 4: Human Body Model 100 pF and 1.5 kX. Machine Model 0X.  
Note 5: The precision of the P5V supply determines the output voltage swing precision of the buffer for very small loads. The operating range of P5V in this  
g
p-p such that the total error of the signal at the output of the buffer never exceeds 5%.  
g
datasheet assumes a 4% error in V  
OUT  
Note 6: This capacitance is dominated by the ESD protection zeners connected to the SYNC pin.  
Note 7: It is important to understand that the load current of the low drop-out voltage regulator must not drop below 2 mA. Otherwise, the internal error  
amplifier will not have sufficient drive capability to the large series pass transistor. If load requirements from the FPD system is less than 2 mA, an external pre-  
Ioad resistor must be connected from V to ground in order to satisfy the previously mentioned load requirements.  
SH  
Note 8: The thermal shutdown mode of the voltage regulator and the system shutdown mode are identical. When either of the two functions are enabled, two  
results occur. The pass transistor of the voltage regulator is shut off and The V  
switching regulator.  
pin of the LMC2626 is pulled up to the V supply to shutdown the LM2625  
IN  
REF  
Note 9: Typical values represent the most likely parametric norm.  
Note 10: The typical closed loop voltage gain of the low drop-out voltage regulator is 3.44(10.7 dB).  
Note 11: The minimum load current of the voltage regulator is a specific parameter used to guarantee that the regulated output voltage of the LDO regulator  
k
k
stays within the limits specified in the datasheet for 1.216V  
V
1.242V. For applications requiring minimum load current less than 20 mA, regulated  
REF  
voltage range must be carefully determined by characterizing the change in regulated output voltage at  
output voltage limits of the voltage regulator and V  
the minimum load current needed.  
REF  
4
5
Physical Dimensions inches (millimeters)  
8-Lead (0.150 Wide) Molded Small Outline Package, JEDEC  
×
Order Number LMC2626IM  
NS Package M08A  
LIFE SUPPORT POLICY  
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT  
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL  
SEMICONDUCTOR CORPORATION. As used herein:  
1. Life support devices or systems are devices or  
systems which, (a) are intended for surgical implant  
into the body, or (b) support or sustain life, and whose  
failure to perform, when properly used in accordance  
with instructions for use provided in the labeling, can  
be reasonably expected to result in a significant injury  
to the user.  
2. A critical component is any component of a life  
support device or system whose failure to perform can  
be reasonably expected to cause the failure of the life  
support device or system, or to affect its safety or  
effectiveness.  
National Semiconductor  
Corporation  
National Semiconductor  
Europe  
National Semiconductor  
Hong Kong Ltd.  
National Semiconductor  
Japan Ltd.  
a
1111 West Bardin Road  
Arlington, TX 76017  
Tel: 1(800) 272-9959  
Fax: 1(800) 737-7018  
Fax: 49 (0) 180-530 85 86  
13th Floor, Straight Block,  
Ocean Centre, 5 Canton Rd.  
Tsimshatsui, Kowloon  
Hong Kong  
Tel: (852) 2737-1600  
Fax: (852) 2736-9960  
Tel: 81-043-299-2308  
Fax: 81-043-299-2408  
@
Email: europe.support nsc.com  
a
Deutsch Tel: 49 (0) 180-530 85 85  
a
English Tel: 49 (0) 180-532 78 32  
a
Fran3ais Tel: 49 (0) 180-532 93 58  
a
Italiano Tel: 49 (0) 180-534 16 80  
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.  
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