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LM3478

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SNVS085X – JULY 2000 – REVISED DECEMBER 2017

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5 Pin Configuration and Functions

8-Lead VSSOP-8 Package

3 Pins

Top View

8-Lead SOIC-8

3 Pins

Top View

Pin Functions

PIN

I/O

DESCRIPTION

NAME

NO.

ISEN

1

I

Current sense input pin. Voltage generated across an external sense resistor is fed into this pin.

COMP

2

I

Compensation pin. A resistor, capacitor combination connected to this pin provides compensation for the

control loop.

FB

3

I

Feedback pin. The output voltage should be adjusted using a resistor divider to provide 1.26 V at this pin.

AGND

4

G

Analog ground pin.

PGND

5

G

Power ground pin.

DR

6

O

Drive pin. The gate of the external MOSFET should be connected to this pin.

FA/SD

7

I

Frequency adjust and Shutdown pin. A resistor connected to this pin sets the oscillator frequency. A high

level on this pin for longer than 30 µs will turn the device off. The device will then draw less than 10µA from

the supply.

VIN

8

P

Power Supply Input pin.