LT1933

3

1933fe

ELECTRICAL CHARACTERISTICS

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LT1933E is guaranteed to meet performance specifications

from 0°C to 70°C. Specifications over the –40°C to 85°C operating

temperature range are assured by design, characterization and correlation

with statistical process controls. The LT1933I specifications are

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Undervoltage Lockout

3.35

3.6

V

Feedback Voltage

l

1.225

1.245

1.265

V

FB Pin Bias Current

l

40

120

nA

Quiescent Current

Not Switching

1.6

2.5

mA

Quiescent Current in Shutdown

0.01

2

μA

Reference Line Regulation

0.01

%/V

Switching Frequency

400

500

600

kHz

55

kHz

Maximum Duty Cycle

l

88

94

%

Switch Current Limit

(Note 3)

0.75

1.05

A

370

370

500

mV

mV

Switch Leakage Current

2μA

Minimum Boost Voltage Above Switch

1.9

2.3

V

BOOST Pin Current

18

25

mA

SHDN Input Voltage High

2.3

V

SHDN Input Voltage Low

0.3

V

SHDN Bias Current

34

0.01

50

0.1

μA

μA

The

guaranteed over the –40°C to 125°C temperature range. The LT1933H

specifications are guaranteed over the –40°C to 150°C temperature range.

Note 3: Current limit guaranteed by design and/or correlation to static test.

Slope compensation reduces current limit at higher duty cycle.

Note 4: Current flows out of pin.

Note 5: Current flows into pin.