Datasheet > AAT1275_08

AAT1275_08

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
19页	627K
描述
Boost Converter with USB Power Switch

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AAT1275_08 数据手册

PRODUCT DATASHEET

AAT1275

SwitchReg^TM

Boost Converter with USB Power Switch

General Description

Features

The AAT1275 SwitchReg is a 2MHz, 500mA synchronous

boost converter with an integrated current-limiting load

switch controlled output. The AAT1275 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 AAT1275 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

The high efficiency boost converter section of the

AAT1275 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.

• Fault Report

• 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

• Digital Still Cameras

• PDAs and Portable Media Players

• Smart Phones

The integrated, programmable current limiting load

switch provides USB port protection for portable devices

allowing the AAT1275 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 AAT1275 output.

• Other Hand-Held Devices

The AAT1275 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

AAT1275

Fault

Enable

FLT

OUT2

V_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

1275.2008.04.1.7

12 3 4 5 6 7...19

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