LT1073

3

Rev B

ELECTRICAL CHARACTERISTICS

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

of a device may be impaired.

Note 2: This specification guarantees that both the high and low trip point

of the comparator fall within the 202mV to 222mV range.

Note 3: This specification guarantees that the output voltage of the fixed

versions will always fall within the specified range. The waveform at the

SENSE pin will exhibit a sawtooth shape due to the comparator hysteresis.

Note 4: 100k resistor connected between a 5V source and the AO pin.

Note 5: The LT1073 is guaranteed to withstand continuous application of

1.6V applied to the GND and SW2 pins while VIN, ILIM and SW1 pins are

grounded.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

IREV

Reverse Battery Current

(Note 5)

750

mA

ILIM

Current Limit

220Ω Between ILIM and VIN

400

mA

Current Limit Temperature Coefficient

–0.3

%/°C

ILEAK

Switch OFF Leakage Current

Measured at SW1 Pin

1

10

µA

VSW2

Maximum Excursion Below GND

ISW1 ≤ 10µA, Switch Off

–400

–350

mV

The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 1.5V unless otherwise specified.

TYPICAL PERFORMANCE CHARACTERISTICS

Saturation Voltage Step-Up Mode

(SW2 Pin Grounded)

Switch ON Voltage Step-Down Mode

(SW1 Pin Connected to VIN)

Maximum Switch Current vs RLIM

FB Pin Bias Current vs

Temperature

SET Pin Bias Current vs

Temperature

“Gain Block” Gain

ISWITCH (A)

0

1.2

1.0

0.8

0.6

0.4

0.2

0

0.2

0.4

0.6

0.8

1073 G01

1.0

1.2

VIN = 1.25V

VIN = 1.5V

VIN = 5V

VIN = 2V

VIN = 1V

VIN = 3V

TEMPERATURE (°C)

–50

100

1073 G04

0

50

20

18

16

14

12

10

8

6

4

–25

25

75

125

ISWITCH (A)

0

0.6

1073 G02

0.2

0.4

0.8

1.4

1.3

1.2

1.1

1.0

0.9

0.8

0.7

0.1

0.3

0.5

0.7

TEMPERATURE (°C)

–50

100

1073 G05

0

50

200

175

150

125

100

75

50

25

0

–25

25

75

125

RLIM ()

10

1200

1100

1000

900

800

700

600

500

400

300

200

100

100

1000

1073 G03

L = 82µH

VIN = 3V

VIN = 1.5V

TEMPERATURE (°C)

–50

100

1073 G06

0

50

1800

1600

1400

1200

1000

800

600

400

200

0

–25

25

75

125

VIN = 1.5V

RL = 100k