LT1573
ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
FB 1
LATCH 2
SHDN 3
GND 4
8
7
6
5
COMP
V
OUT
V
IN
DRIVE
Input Pin Voltage (V
IN
to GND) ............................... 10V
Drive Pin Voltage (V
DRIVE
to GND).......................... 10V
Output Pin Voltage (V
OUT
to GND) .......................... 10V
Shutdown Pin Voltage (V
SHDN
to GND) .................. 10V
Operating Junction Temperature Range
LT1573C ............................................... 0°C to 125°C
LT1573I ............................................ –40°C to 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec.)................ 300°C
ORDER PART
NUMBER
LT1573CS8
LT1573CS8-2.5
LT1573CS8-2.8
LT1573CS8-3.3
LT1573IS8
S8 PART MARKING
157333
1573
157325 1573I
157328
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 125°C,
θ
JA
= 85°C/ W
Consult factory for Military grade parts.
The
q
denotes specifications that apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. V
IN
= 5V, V
DRIVE
= 3V, unless otherwise noted.
PARAMETER
DC Characteristics
LT1573 Reference Voltage (Adjustable)(Note 2)
I
DRIVE
= 20mA, T
J
= 25°C
5mA < I
DRIVE
< 250mA, 3V < V
IN
< 7V,
1.5V < V
DRIVE
< 7V
LT1573-3.3 Output Voltage (Note 2)
I
DRIVE
= 20mA. T
J
= 25°C
5mA < I
DRIVE
< 250mA, 3.5V < V
IN
< 7V,
1.5V < V
DRIVE
< 7V
LT1573-2.8 Output Voltage (Note 2)
I
DRIVE
= 20mA, T
J
= 25°C
5mA < I
DRIVE
< 250mA, 3V < V
IN
< 7V,
1.5V < V
DRIVE
< 7V
LT1573-2.5 Output Voltage (Note 2)
I
DRIVE
= 20mA, T
J
= 25°C
5mA < I
DRIVE
< 250mA, 3V < V
IN
< 7V,
1.5V < V
DRIVE
< 7V
Line Regulation
LT1573 (V
FB
)
LT1573-3.3 (V
OUT
)
LT1573-2.8 (V
OUT
)
LT1573-2.5 (V
OUT
)
Load Regulation
LT1573 (V
FB
)
LT1573-3.3 (V
OUT
)
LT1573-2.8 (V
OUT
)
LT1573-2.5 (V
OUT
)
FB Pin Bias Current (Adjustable Only)
DRIVE Pin Current
DRIVE Pin Saturation Voltage
SHDN Pin Threshold Voltage
SHDN Pin Current
V
SHDN
= 5V
I
DRIVE
= 20mA, 3V < V
IN
< 7V
I
DRIVE
= 20mA, 3.5V < V
IN
< 7V
I
DRIVE
= 20mA, 3V < V
IN
< 7V
I
DRIVE
= 20mA, 3V < V
IN
< 7V
∆I
DRIVE
= 20mA to 250mA
∆I
DRIVE
= 20mA to 250mA
∆I
DRIVE
= 20mA to 250mA
∆I
DRIVE
= 20mA to 250mA
V
FB
= 1.265V
V
FB
= 1.35V, V
DRIVE
= 7V
V
FB
= 1.15V, V
DRIVE
= 1.5V
I
DRIVE
= 20mA, V
FB
= 1.15V
I
DRIVE
= 250mA, V
FB
= 1.15V
q
q
q
q
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
1.252
1.225
3.267
3.234
2.772
2.744
2.475
2.450
TYP
1.265
1.265
3.3
3.3
2.8
2.8
2.5
2.5
MAX
1.278
1.305
3.333
3.366
2.828
2.856
2.525
2.550
UNITS
V
V
V
V
V
V
V
V
q
q
q
q
q
q
q
q
q
q
q
q
q
q
0.17
0.34
0.34
0.25
7
18
15
13
0.8
250
440
0.12
0.73
1.0
1.33
200
2
5
4
4
30
40
34
30
5
2
0.3
1.4
1.6
2
U
mV
mV
mV
mV
mV
mV
mV
mV
µA
mA
mA
V
V
V
µA
W
U
U
W W
W
LINER [ LINEAR TECHNOLOGY ]
