Datasheet > AAT1276

AAT1276

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
ANALOGICTECH		转换器开关电源开关升压转换器
页数	文件大小	规格书
18页	366K
描述
Boost Converter with USB Power Switch

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AAT1276 数据手册

PRODUCT DATASHEET

AAT1276

SwitchReg^TM

Boost Converter with USB Power Switch

General Description

Features

The AAT1276 SwitchReg is a 2MHz, 500mA synchronous

boost converter with an integrated current-limiting load

switch controlled output. The AAT1276 operates from a

single-cell Lithium-ion/ polymer battery source and pro-

vides a regulated 5V, current limit controlled output to

support USB port V_BUSapplications in portable consumer

electronic products. The AAT1276 can support both USB

2.0 host port and USB on-the-go operation, as well as

general purpose applications where a 5V supply with a

user programmable current limit is needed.

• High Frequency Boost With 5V / 500mA Output Capability

From a Single-Cell Lithium-Ion/Polymer Battery

• Input Voltage Range: 2.7V to 5V

• V_OUT1Adjustable or Fixed (5V)

• >90% Efficiency

• Up to 2MHz Switching Frequency

• True Load Disconnect

• Load Switch With Programmable Current Limit

• Over-Temperature, Over-Current Protection

• Inrush Current Limit

• Fault Report

The high efficiency boost converter section of the

AAT1276 is typically set for a 5V output and can deliver

up to 500mA load current to support USB V_BUSoperation

from an input supply as low as 2.7V. The high boost

converter switching frequency (up to 2.0MHz) provides

fast load transient and allows the use of small external

components. Fully integrated control circuitry simplifies

system design and reduces total solution size.

• Low Shutdown Current < 1μA Typical

• -40°C to +85°C Temperature Range

• TSOPJW-12 and TDFN34-16 Packages

Applications

• USB On-the-Go

• Cell Phones

The integrated, programmable current limiting load

switch provides USB port protection for portable devices

allowing the AAT1276 to supply a 5V USB V_BUSup to

500mA. The load switch provides an active low fault flag

to alert the system in the event of an over-current condi-

tion applied to the AAT1276 output.

• Digital Still Cameras

• PDAs and Portable Media Players

• Smart Phones

• Other Hand-Held Devices

The AAT1276 is available in the Pb-free, space-saving

12-pin TSOPJW and 16-pin TDFN34 packages and is

rated over the -40°C to +85°C operating temperature

range.

Typical Application

L1 2.2μH

LIN

V_IN

OUT1

C_IN

4.7μF

C_OUT1

4.7μF

R_FB1

432k

VCC

10k

R_FB2

59k

AAT1276

Fault

Enable

FLT

OUT2

_BUSOutput

SET

C_OUT2

1μF

R_SET

GND

w w w . a n a l o g i c t e c h . c o m

1276.2007.11.1.1

12 3 4 5 6 7...18

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