LM1771UMM datasheet(5/31 Pages) TI1

Part #	LM1771UMM

Description	Low-Voltage Synchronous Buck Controller

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LM1771

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SNVS446D – JUNE 2006 – REVISED JANUARY 2016

6.5 Electrical Characteristics

Specifications are for TJ = 25°C. All maximum and minimum limits apply over the full junction temperature range (−40°C to

+125°C), unless otherwise specified. Minimum and maximum limits are ensured through test, design or statistical correlation.

Typical values represent the most likely parametric norm at TJ = 25°C and are provided for reference purposes only. Unless

otherwise specified, VIN = 3.3 V.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VFB

Feedback pin voltage

0.782

0.8

0.818

V

IQ

Quiescent current

VFB = 0.9 V

400

700

µA

LM1771S - (500 ns)

0.4

0.5

0.6

TON

Switch ON-time

LM1771T - (1000 ns)

0.8

1

1.2

µs

LM1771U - (2000 ns)

1.6

2

2.4

LM1771S - (500 ns)

150

250

TOFF_MIN

Minimum OFF-time

LM1771T - (1000 ns)

135

225

ns

LM1771U - (2000 ns)

120

220

TD

Gate drive dead-time

70

ns

VIH_EN

EN pin rising threshold

1.15

1.2

1.25

V

VEN_HYS

EN pin hysteresis

50

200

mV

IFB

Feedback pin bias current

VFB = 0.9 V

50

nA

VUVLO

Undervoltage lockout

VIN Rising Edge

2.65

2.8

V

VUVLO_HYS

Undervoltage lockout hysteresis

50

mV

VSC_TH

Feedback pin short circuit latch

0.42

0.55

0.65

V

threshold

RDS(ON) 1

HG FET driver pullup ON-resistance

IHG = 20 mA

4

Ω

RDS(ON) 2

HG FET driver pulldown ON-resistance

IHG = 20 mA

6

Ω

RDS(ON) 3

LG FET driver pullup ON-resistance

ILG = 20 mA

4

Ω

RDS(ON) 4

LG FET driver pulldown ON-resistance

ILG = 20 mA

6

Ω

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