3

LT1573

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

LATCH Pin Latch-Off Threshold Voltage

q

0.8

1.4

2.2

V

LATCH Pin Charging Current

7

µA

LATCH Pin Latching Current

0.65

mA

q

0.4

0.7

1.0

V

Input Quiescent Current

q

1.7

3.5

mA

Minimum Input Voltage for Bias Operation

q

2.8

V

Note 1: Absolute Maximum Ratings are those values beyond which the life

of the device may be impaired.

Note 2: Operating conditions are limited by maximum junction

temperature. The regulated feedback or output voltage specification will

not apply for all possible combinations of input voltage, drive voltage and

drive current. When operating at maximum drive current, the drive voltage

range must be limited. When operating at maximum input and drive

voltage, the drive current must be limited.

TEMPERATURE (

°C)

–50

1.290

1.285

1.280

1.275

1.270

1.265

1.260

1.255

1.250

1.245

1.240

0

50

75

1573 G01

–25

25

100 125

150

LT1573 Feedback Pin Voltage

vs Temperature

TEMPERATURE (

°C)

–50

3.40

3.38

3.36

3.34

3.32

3.30

3.28

3.26

3.24

3.22

3.20

0

50

75

1573 G02

–25

25

100

125

LT1573-3.3V Output Voltage

vs Temperature

TEMPERATURE (

°C)

–50

2.90

2.88

2.86

2.84

2.82

2.80

2.78

2.76

2.74

2.72

2.70

0

50

75

1573 G03

–25

25

100

125

LT1573-2.8V Output Voltage

vs Temperature

TEMPERATURE (

°C)

1573 G06

3.0

2.5

2.0

1.5

1.0

0.5

0

–50

0

50

75

–25

25

100 125

150

LT1573-2.5V Output Voltage

vs Temperature

TEMPERATURE (

°C)

–50

2.60

2.58

2.56

2.54

2.52

2.50

2.48

2.46

2.44

2.42

2.40

0

50

75

1573 G04

–25

25

100

125

Feedback Pin Bias Current

vs Temperature

Quiescent Current

vs Temperature

TEMPERATURE (

°C)

–50

2.5

2.0

1.5

1.0

0.5

0

0

50

75

1573 G05

–25

25

100 125

150

ELECTRICAL CHARACTERISTICS

TYPICAL PERFOR A CE CHARACTERISTICS