Connection Diagram

Top View

20186909

8 Lead Plastic MSOP-8

NS package Number MUA08A

Package Marking and Ordering Information

Order Number

Package Type

Package Marking

Supplied As:

LM3489MM

MSOP-8

SKSB

1000 units on Tape and Reel

LM3489MMX

MSOP-8

SKSB

3500 units on Tape and Reel

Pin Descriptions

Pin #

Name

Description

1

ISENSE

The current sense input pin. This pin should be connected to the PFET drain

2

GND

Signal ground.

3

EN

Enable pin. Connect EN pin to ground to shutdown the part or float to enable

operation (Internally pulled high). This pin can also be used to perform UVLO

function.

4

FB

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

output and GND for an adjustable output voltage.

5

ADJ

Current limit threshold adjustment. Connected to an internal 5.5µA current source.

A resistor is connected between this pin and VIN. The voltage across this resistor

is compared with the ISENSE pin voltage to determine if an over-current condition

has occurred.

6

PGND

Power ground.

7

PGATE

Gate Drive output for the external PFET. PGATE swings between VIN and VIN-5V.

8

VIN

Power supply input pin.

www.national.com

2