AAT1157 Ver la hoja de datos (PDF) - Analog Technology Inc

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AAT1157

1MHz 1.2A Buck DC/DC Converter

Analog Technology Inc 

General Description

The AAT1157 SwitchReg™ is a member of

AnalogicTech's Total Power Management IC™

(TPMIC™) product family. The step-down switch-

ing converter is ideal for applications where fixed

frequency and low ripple are required over the full

range of load conditions. The 2.7V to 5.5V input

voltage range makes the AAT1157 ideal for single-

cell lithium-ion/polymer battery applications.

Capable of up to 1.2A with internal MOSFETs, the

current-mode controlled IC provides high efficiency

over a wide operating range. Fully integrated com-

pensation simplifies system design and lowers

external parts count. The device operates at a

fixed 1MHz switching frequency across all load

conditions.

The AAT1157 is available in the Pb-free, 16-pin

3x3mm QFN package and is rated over the -40°C

to +85°C temperature range.

AAT1157

1MHz 1.2A Buck DC/DC Converter

Features

SwitchReg™

• VIN Range: 2.7V to 5.5V

• Up to 95% Efficiency

• 110 mΩ RDS(ON) Internal Switches

• <1µA Shutdown Current

• 1MHz Buck Switching Frequency

• Fixed or Adjustable VOUT ≥ 0.8V

• Integrated Power Switches

• Current Mode Operation

• Internal Compensation

• Stable with Ceramic Capacitors

• Constant PWM Operation for Low Output

Ripple

• Internal Soft Start

• Over-Temperature Protection

• Current Limit Protection

• 16-Pin QFN 3x3mm Package

• -40°C to +85°C Temperature Range

Applications

• HDD MP3 Players

• Notebook Computers

• PDAs

• Point-of-Load Regulation

• Set Top Boxes

• Smart Phones

• Wireless Notebook Adapters

Typical Application

3.3V

R1

100

C1

10µF

C2

0.1µF

U1

AAT1157

12 VP

FB 4

11 VP

LX 15

10 VP

LX 14

7 EN

LX 13

9 VCC

N/C 16

6 N/C PGND 3

8 N/C PGND 2

5 SGND PGND 1

L1

3.0µH

2.5V

R3

187k

R4

C3-C4

59k

2x 22µF

1157.2005.11.1.4

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