Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

V

IN

-0.3V to 6V

EN, FB, HG, LG

-0.3V to V

IN

Storage Temperature Range

−65˚C to 150˚C

Junction Temperature

150˚C

Lead Temperature

(soldering, 10sec)

260˚C

ESD Rating

2kV

Operating Ratings

V

2.8V to 5.5V

Junction Temperature Range (T

−40˚C to +125˚C

type apply over the full Junction Temperature Range (−40˚C to +125˚C). Minimum and Maximum limits are guaranteed

through test, design or statistical correlation. Typical values represent the most likely parametric norm at T

provided for reference purposes only. Unless otherwise specified V

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

V

FB

Feedback pin voltage

0.782

0.8

0.818

V

I

Q

Quiescent current

V

400

700

µA

T

ON

Switch On-Time

LM1771S - (500ns)

0.4

0.5

0.6

µs

LM1771T - (1000ns)

0.8

1.0

1.2

LM1771U - (2000ns)

1.6

2.0

2.4

T

OFF_MIN

Minimum Off-Time

LM1771S - (500ns)

150

250

ns

LM1771T - (1000ns)

135

225

LM1771U - (2000ns)

120

220

T

D

Gate Drive Dead-Time

70

ns

V

IH_EN

EN Pin Rising Threshold

1.15

1.2

1.25

V

V

EN_HYS

EN Pin Hysteresis

50

200

mV

I

FB

Feedback pin bias current

V

50

nA

V

UVLO

Under-voltage lock out

V

2.65

2.8

V

V

UVLO_HYS

Under-voltage lock out hysteresis

50

mV

V

SC_TH

Feedback pin Short Circuit Latch

Threshold

0.42

0.55

0.65

V

R

DS(ON) 1

HG FET driver pull-up On resistance

I

4

Ω

R

DS(ON) 2

HG FET driver pull-down On resistance I

6

Ω

R

DS(ON) 3

LG FET driver pull-up On resistance

I

4

Ω

R

DS(ON) 4

LG FET driver pull-down On resistance I

6

Ω

Note 1: Absolute Maximum Ratings indicate limits beyond which damage may occur to the device. Operating Ratings indicate conditions for which the device is

intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications, see Electrical Characteristics.

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