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AMS4155

2A OUTPUT PWM BUCK CONVERTER

Advanced Monolithic Systems Inc 

Advanced

Monolithic

Systems

FEATURES

• Stable with low ESR Output Ceramic Capacitors

• Up to 95% Efficiency

• 2A Continuous Output Current

• Wide 4.75V to 20V Operating Input Range

• Fixed 480kHz Frequency

• Thermal Shutdown

• Cycle-by-cycle + hiccup Over Current Protection

• Under Voltage Lockout

• Frequency Synchronization Input

• Operating Temperature: -40°C to 125°C

• Available in an 8-Pin SO Package

AMS4155

2A OUTPUT PWM BUCK CONVERTER

RoHS compliant

APPLICATIONS

• Battery Chargers

• Portable (Notebook) Computers

• Industrial power supply

• Point of regulation for high performance electronics

• Consumer Electronics

• Audio Power Amplifiers

• Distributed Power Systems

• Pre-Regulator for Linear Regulators

• LCD TVs and LCD monitors

GENERAL DESCRIPTION

The AMS4155 is a monolithic step down switch mode converter with a built in internal power Switch Transistor. It achieves 2A

continuous output current over a wide input supply range with excellent load and line regulation.

Current mode operation provides fast transient response and eases loop stabilization. Fault condition protection includes cycle-

by-cycle current limiting and thermal shutdown. In shutdown mode the regulator draws 17µA of supply current.

ORDERING INFORMATION

OUTPUT PACKAGE TYPE TEMP. RANGE

VOLTAGE 8 Lead SOIC

Adjustable AMS4155S

-25°C to 125°C

TYPICAL APPLICATION

PIN CONNECTIONS

INPUT

470µF/

10µF CER

ON EN

OFF

VIN

BST

3

2

8

AMS4155

1µF

LX

4

SYNC 1

5

GND

7

COMP

6 F/B

10nF

10 µH

B230A

5kΩ

OUTPUT

5V/3A

30kΩ

40µF

ceramic

10kΩ

8L SOIC

SO Package (S)

SYNC 1

BST 2

VIN 3

LX 4

8 EN

7 COMP

6 FB

5 GND

Top View

Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723

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