Functional Block Diagram

20092908

Pin Descriptions

Pin #

Name

Description

1

CNOISE

Noise bypass pin. For low noise applications a 0.1µF or larger ceramic

capacitor should be connected from this pin to ground

2

DELAY

A capacitor connected from this pin to ground will allow a delayed

power-on-reset signal at the ERROR (pin 7) output.

3

GND

Ground pin. Local ground for C

4V

IN

Input supply pin. Bypass this with a 1µF capacitor.

5V

OUT

Output voltage, Connect C

6

SENSE

Connect this pin to VOUT (pin 5).

7

ERROR

This open drain output is an error flag output which goes low when V

OUT

drops 5% below it nominal voltage. This pin also provides a power-on-reset

signal if a capacitor is connected to the DELAY pin.

8SD

Shutdown. Disables the regulator when less than 0.4V is applied. Enables the

regulator when greater than 0.9V. The Shutdown pin is pulled down internally

bya6M

Ω resistor.

Connection Diagram

8 Lead MSOP

NS Package Number MUA08A

20092904

www.national.com

2