AMS4122 데이터 시트보기 (PDF) - Advanced Monolithic Systems Inc

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AMS4122

SINGLE 4A/DUAL 2A BUCK CONVERTER IN SO8

Advanced Monolithic Systems Inc 

Advanced

Monolithic

Systems

AMS4122

SINGLE 4A/DUAL 2A BUCK CONVERTER IN SO8

RoHS compliant

FEATURES

• 2 Independent Asynchronous Buck Converters in SO-8

• Internally compensated

• Built in soft start

• Enable with Zero current shut down

• 400KHz switching per output

• Interleaved oscillator to reduced supply ripple

• Simply re-configures to 2 phase single output

• Up to 4A output in 2 phase mode

• Independent hiccup current limit

APPLICATIONS

• Audio Power Amplifiers

• Portable (Notebook) Computers

• Point of regulation for high performance electronics

• Consumer Electronics

• Desktop Computers

• LCD TVs and LCD monitors

• Distributed Power Systems

• Battery Chargers

• Pre-Regulator for Linear Regulators

GENERAL DESCRIPTION

AMS4122 is a dual switching regulator capable to deliver 2A for each channel. Internally Compensated internal Soft Start

makes AMS4122 one of the simplest and easiest switching regulators to use with the minimum external components. Each

regulator has independent hiccup current limit. The Enable pin turns both devices on when a voltage of 2.5V or higher it is

applied to EN pin. Since both devices share one single package the thermal protection turns off both devices when the die

temperature exceeds approximately 135°C. Both regulators are adjustable using a 0.600V reference for low output voltage

settings. The oscillators are 180° phase to each other to reduce the ripples on the input power supply and minimize the power

dissipation on the package. The device can be easily configured for Two Phase single output switching regulator capable of 5A

output load. By applying a 2.5V or greater on feedback pin of the second switching regulator the device enters in Two Phase

Mode. The first benefit of having a Two Phase device is reducing the output ripples by a factor of four as the single phase. The

second benefit is higher output current capability at overall low cost. AMS4122 combined with AMS4123 (2A Switching

Regulator + 1A LDO in SO-8) makes complete solution for LCD TV power requirements.

ORDERING INFORMATION

Package Type

SOIC EDP

AMS4122S

TEMP. RANGE

-25°C to 125°C

TYPICAL APPLICATION

PINCONNECTIONS

8L SOIC

SO Package (S)

SW2 1

PVIN 2

GND 3

F/B2 4

8 SW1

7 AVIN

6 EN

5 F/B1

Top View

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

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