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LT1941

1941f

The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.

VIN, VBIAS1, VBIAS2 = 5V, VBOOST1, VBOOST2 = 8V, unless otherwise noted. (Note 2)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

NFB4 Voltage (VFB4-VNVB4)

1.212

1.24

1.258

1.205

1.260

FB3 Pin Output Current

VFB3 = 1.35V, VNFB = –0.1V

150

350

µA

PGOOD3 Threshold Offset

VFB Rising

120

Error Amplifier Transconductance

800

µMhos

Error Amplifier Voltage Gain

150

V/V

VC Switching Threshold

1.1

VC3 to Switch Current Gain

A/V

Frequency Shift Threshold on FB3

0.65

Switch 3 Current Limit (Note 5)

1.5

2.9

Switch 3 VCESAT

ISW = 1A

240

320

BIAS2 Pin Current

ISW = 1A

Switch 3 Leakage Current

0.01

µA

Maximum Duty Cycle

ELECTRICAL CHARACTERISTICS

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

of a device may be impaired.

Note 2: The LT1941E 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.

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

test. Slope compensation reduces current limit at higher duty cycles.

Note 4: This is the minimum voltage across the boost capacitor needed to

guarantee full saturation of the internal power switch.

Note 5: Current limit is guaranteed by design and/or correlation to static

test.

Note 6: This IC includes overtemperature protection that is intended to

protect the device during momentary overload conditions. Junction

temperature will exceed 125

°C when overtemperature protection is active.

Continuous operation above the specified maximum operating junction

temperature may impair device reliability.

Note 7: Guaranteed by design, not 100% tested.

TYPICAL PERFOR A CE CHARACTERISTICS

Efficiency, VOUT1 = 1.8V

LOAD CURRENT (A)

1941 G01

0.5

1.5

2.5

VIN = 5V

TA = 25°C

Efficiency, VOUT2 = 3.3V

Efficiency, VOUT3 = –12V

LOAD CURRENT (A)

0.25

0.5

0.75

1941 G07

1.25

1.5

VIN = 5V

TA = 25°C

LOAD CURRENT (mA)

100

150

200

1941 G08

250

300

VIN = 5V

TA = 25°C

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