Datasheet > AAT1145

AAT1145

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
ANALOGICTECH		转换器
页数	文件大小	规格书
16页	305K
描述
1.2A Step-Down Converter

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AAT1145 数据手册

PRODUCT DATASHEET

AAT1145

SwitchReg^TM

1.2A Step-Down Converter

General Description

Features

The AAT1145 SwitchReg™ is a 1.5MHz constant fre-

quency current mode PWM step-down converter. It is

ideal for portable equipment requiring very high current

up to 1.2A from single-cell Lithium-ion batteries while

still achieving over 90% efficiency during peak load con-

ditions. The AAT1145 also can run at 100% duty cycle

for low dropout operation, extending battery life in por-

table systems while light load operation provides very

low output ripple for noise sensitive applications.

• Input Voltage Range: 2.5V to 5.5V

• Output Voltages from 0.6V to V_IN

• 1.2A Output Current

• High Efficiency: Up to 95%

• 1.5MHz Constant Switching Frequency

• Low R_DS(ON)Internal Switches: 0.15Ω

• Allows Use of Ceramic Capacitors

• Current Mode Operation for Excellent Line and Load

Transient Response

• Short-Circuit and Thermal Fault Protection

• Soft Start

• Low Dropout Operation: 100% Duty Cycle

• Low Shutdown Current: I_SHUTDOWN< 1μA

• TDFN33-10 Package

The AAT1145 can supply up to 1.2A output load current

from a 2.5V to 5.5V input voltage and the output voltage

can be regulated as low as 0.6V. The high switching fre-

quency minimizes the size of external components while

keeping switching losses low. The internal slope compen-

sation setting allows the device to operate with smaller

inductor values to optimize size and provide efficient

operation.

• -40°C to +85°C Temperature Range

Applications

The AAT1145 is available in adjustable (0.6V to V_IN) and

fixed (1.8V) output voltage versions. The device is avail-

able in a Pb-free, 3x3mm 10-lead TDFN package and is

rated over the -40°C to +85°C temperature range.

• Cellular Phones

• Digital Cameras

• DSP Core Supplies

• PDAs

• Portable Instruments

• Smart Phones

Typical Application

2.2μH

VOUT

1.8V,1.2A

VIN 2.5V-5.5V

22μF

10μF

AAT1145-1.8

AIN

OUT

AGND

PGND

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1145.2007.11.1.1

12 3 4 5 6 7...16

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