Advanced Monolithic Systems, Inc. www.advanced-monolithic.com

Phone (925) 443-0722 Fax (925) 443-0723

Advanced

AMS4155

Monolithic

2A OUTPUT PWM BUCK CONVERTER

Systems

RoHS compliant

FEATURES

APPLICATIONS

• Stable with low ESR Output Ceramic Capacitors

• Battery Chargers

• Up to 95% Efficiency

• Portable (Notebook) Computers

• 2A Continuous Output Current

• Industrial power supply

• Wide 4.75V to 20V Operating Input Range

• Point of regulation for high performance electronics

• Fixed 480kHz Frequency

• Consumer Electronics

• Thermal Shutdown

• Audio Power Amplifiers

• Cycle-by-cycle + hiccup Over Current Protection

• Distributed Power Systems

• Under Voltage Lockout

• Pre-Regulator for Linear Regulators

• Frequency Synchronization Input

• LCD TVs and LCD monitors

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

• Available in an 8-Pin SO Package

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

TYPICAL APPLICATION

PIN CONNECTIONS

INPUT

1

µF

10 µH

OUTPUT

5V/3A

B230A

30k

Ω

10k

Ω

40µF

ceramic

470

µF/

10µF CER

5k

Ω

10nF

1

2

3

4

5

6

7

8

GND

VIN

BST

EN

COMP

F/B

SYNC

LX

AMS4155

OFF

ON

OUTPUT

PACKAGE TYPE

TEMP. RANGE

VOLTAGE

8 Lead SOIC

Adjustable

AMS4155S

-25°C to 125°C

8L SOIC

SO Package (S)

2

8

3

4

7

6

5

FB

GND

LX

COMP

BST

VIN

1

EN

SYNC

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