LM3478

LM3478-Q1

SNVS085V – JULY 2000 – REVISED FEBRUARY 2013

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Electrical Characteristics (continued)

Symbol

Parameter

Conditions

Typical

Limit

Unit

Gm

Error Amplifier

800

µmho

Transconductance

600/ 365

µmho (min)

1000/ 1265

µmho (max)

Error Amplifier Voltage Gain

38

V/V

26

V/V (min)

44

V/V (max)

Error Amplifier Output Current

110

µA

(Source/ Sink)

80/ 50

µA (min)

140/ 180

µA (max)

−140

µA

−100/ −85

µA (min)

−180/ −185

µA (max)

Error Amplifier Output Voltage

Upper Limit

2.2

V

Swing

1.8

V(min)

COMP Pin = Floating

2.4

V(max)

Lower Limit

0.56

V

0.2

V(min)

1.0

V(max)

Internal Soft-Start Delay

4

msec

Drive Pin Rise Time

25

ns

Drive Pin Fall Time

25

ns

Output = High

1.27

1.4

V

V (max)

Output = Low

0.65

0.3

V

V (min)

Shutdown Pin Current

−1

µA

+1

Feedback Pin Current

15

nA

Thermal Shutdown

165

°C

Thermal Shutdown Hysteresis

10

°C

Thermal Resistance

VSSOP Package

200

°C/W

SOIC Package

151

(6)

maximum limit for Output = High to keep the regulator off and must be below the limit for Output = Low to keep the regulator on.

4

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