Connection Diagram

Top View

20034609

8 Lead Plastic MSOP-8

NS package Number MUA08A

Package Marking and Ordering Information

Order Number

Package Type

Package Marking

Supplied As:

LM3485MM

MSOP-8

S29B

1000 units on Tape and Reel

LM3485MMX

MSOP-8

S29B

3500 units on Tape and Reel

Pin Description

Pin Name

Pin Number

Description

ISENSE

1

The current sense input pin. This pin should be connected to Drain

node of the external PFET.

GND

2

Signal ground.

NC

3

No connection.

FB

4

The feedback input. Connect the FB to a resistor voltage divider

between the output and GND for an adjustable output voltage.

ADJ

5

Current limit threshold adjustment. It connects to an internal 5.5µA

current source. A resistor is connected between this pin and the

input Power Supply. The voltage across this resistor is compared

with the V

condition has occurred.

PWR GND

6

Power ground.

PGATE

7

Gate Drive output for the external PFET. PGATE swings between

V

VIN

8

Power supply input pin.

www.national.com

2