LM1770

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SNVS403C – SEPTEMBER 2005 – REVISED APRIL 2013

Electrical Characteristics

(1)

Range (

−40°C to +125°C). Minimum and Maximum limits are specified through test, design or statistical correlation. Typical

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VFB

Feedback pin voltage

0.782

0.80

0.818

V

0.772

0.79

0.808

Line Regulation

-5

mV/V

Operating Quiescent current

400

600

µA

Switch On-Time

LM1770S - (500ns)

0.4

0.5

0.6

µs

LM1770T - (1000ns)

0.8

1.0

1.2

LM1770U - (2000ns)

1.6

2.0

2.4

Minimum Off-Time

LM1770S - (500ns)

150

250

ns

LM1770T - (1000ns)

135

225

LM1770U - (2000ns)

120

220

Gate Drive Dead-Time

70

ns

Feedback pin bias current

50

nA

Under-voltage lock out

2.6

2.8

V

Under-voltage lock out hysteresis

30

mV

Feedback pin Short Circuit Latch

0.5

0.55

0.65

V

Threshold

HG FET driver pull-up On resistance

5

Ω

HG FET driver pull-down On resistance

9

Ω

LG FET driver pull-up On resistance

9

Ω

LG FET driver pull-down On resistance

5

Ω

(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 ensure specific performance limits. For ensured specifications, see Electrical

Characteristics.

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