AAT1142 데이터 시트보기 (PDF) - Analog Technology Inc

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AAT1142

800mA Voltage-Scaling Step-Down Converter

Analog Technology Inc 

AAT1142

800mA Voltage-Scaling Step-Down Converter

Functional Block Diagram

FB

VIN PVIN

MODE/SYNC

Voltage

Reference

EN/SET

SDA

SCL

Err.

Amp.

Control

Logic

DH

Logic

DL

AGND

LX

PGND

Functional Description

The AAT1142 is a high performance, 800mA step-

down converter with an input voltage range from

2.7V to 5.5V. The AAT1142 uses Dynamic Voltage

Management, which allows the system host to

quickly set the output voltage through the integrat-

ed I2C or S2Cwire interface. Through this interface,

the host can change the output voltage to track

processor idle and active states, greatly extending

battery life without degrading system performance.

I2C provides an industry-standard, dual-line inter-

face, while S2Cwire provides a single-line, high-

speed serial interface.

The 2.2MHz switching frequency allows the use of

small external components. Only three external

components are needed to program the output

10

from 0.6V to 2.0V. Typically, one 4.7µF capacitor,

one 10µF capacitor, and one 2.2µH inductor are

required.

The integrated low-loss MOSFET switches provide

up to 93% efficiency. PFM operation maintains

high efficiency under light load conditions (typically

<50mA). Pulling the MODE/SYNC pin high allows

optional PWM Only low noise mode. This main-

tains constant frequency and low output ripple

across all load conditions. Alternatively, the IC can

be synchronized to an external clock via the

MODE/SYNC input. External synchronization can

be maintained between 1MHz and 3MHz.

At low input voltages, the converter dynamically

adjusts the operating frequency prior to dropout to

maintain the required duty cycle and provide accu-

1142.2006.07.1.0

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