AMS3108S datasheet(2/10 Pages) AMS

2 / 10 page

AMS3108

Micropower 700mA Low Noise Fast Transient Response LDO

02/11/2010

www.advanced-monolithic.com

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Pin Description (SOIC-8 EDP package)

Pin #

Symbol

Description

BYP

Reference Bypass pin. Connect an external capacitor from CBYP to ground to

bypass the noise generated by the internal bandgap. This improves power supply

rejection ratio and output noise.

GND

Ground

GND

Ground

VIN

Input supply Voltage. It powers the internal control circuitry and the internal power

switch. Bypass VIN with at ceramic capacitor from this pin to ground.

VOUT

Output Voltage

ADJ

Provides feedback to error amplifier from the resistive divider that sets the output

voltage.

No Connection

Power Good pin. It is an open collector, active high output that indicates the status

of the output voltage. When output voltage (VOUT) exceeds the PG trip threshold,

the PG pin goes in to a high impedance state. When the device is out of regulation

or shutdown, the PG pin is pulled low. A 10KΩ to 1MΩ resistor should be

connected from PG to VOUT.

Enable pin. It controls the electrical on/off of the device. When connected to logic

low, the device shuts off and consumes less than 1µA of current. Logic high will

resume normal operation.

GND

Expose pad. Connected to PCB ground plane for good thermal dissipation.

Pin Configuration

SOIC-8 EDP (Top View)

VIN

VOUT

GND

BYP

GND

8 EN

ADJ / NC

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