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LT1941

Triple Monolithic Switching Regulator

Linear Technology 

LT1941

ELECTRICAL CHARACTERISTICS The l 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

Switch 2 Leakage Current

0.01

10

μA

Minimum Boost Voltage Above Switch (Note 4)

1.8

2.5

V

Maximum Duty Cycle

l 78

88

%

1.5A Inverting/Boost

FB3 Voltage

1.23 1.25 1.27

V

l 1.22

1.27

V

FB3 Pin Bias Current

l

800 1400

nA

NFB Voltage

l –15

0

15

mV

NFB Pin Bias Current

l

60

500

nA

NFB3 Voltage (VFB3-VNFB)

1.212 1.24 1.258

V

l 1.205

1.260

V

FB3 Pin Output Current

PGOOD3 Threshold Offset

Error Amplifier Transconductance

VFB3 = 1.35V, VNFB = –0.1V

VFB Rising

l 150

350

120

800

μA

mV

μMhos

Error Amplifier Voltage Gain

150

V/V

VC Switching Threshold

VC3 to Switch Current Gain

Frequency Shift Threshold on FB3

1.1

V

5

A/V

0.65

V

Switch 3 Current Limit (Note 5)

l 1.5

2

2.9

A

Switch 3 VCESAT

BIAS2 Pin Current

Switch 3 Leakage Current

ISW = 1A

ISW = 1A

240

320

mV

30

45

mA

0.01

10

μA

Maximum Duty Cycle

l 77

86

%

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 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.

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