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AAT1121

Description
SWITCHING REGULATOR
Categorysemiconductor    Analog mixed-signal IC   
File Size529KB,20 Pages
ManufacturerAAT [Advanced Analog Technology, Inc.]
Download Datasheet Parametric Compare View All

AAT1121 Overview

SWITCHING REGULATOR

AAT1121 Parametric

Parameter NameAttribute value
stateACTIVE
Analog IC other typesswitching regulator
AAT1121
1.5MHz, 250mA Step-Down Converter
General Description
The AAT1121 SwitchReg is a 1.5MHz step-down
converter with an input voltage range of 2.7V to
5.5V and output as low as 0.6V. Its low supply
current, small size, and high switching frequency
make the AAT1121 the ideal choice for portable
applications.
The AAT1121 delivers 250mA of load current, while
maintaining a low 30µA no load quiescent current.
The 1.5MHz switching frequency minimizes the size
of external components, while keeping switching
losses low. The AAT1121 feedback and control
delivers excellent load regulation and transient
response with a small output inductor and capacitor.
The AAT1121 is available in a Pb-free, 8-pin,
2x2mm TDFN or STDFN package and is rated
over the -40°C to +85°C temperature range.
Features
SwitchReg
V
IN
Range: 2.7V to 5.5V
V
OUT
Range: 0.6V to V
IN
250mA Max Output Current
Up to 96% Efficiency
30µA Typical Quiescent Current
1.5MHz Switching Frequency
Soft-Start Control
Over-Temperature and Current Limit
Protection
100% Duty Cycle Low-Dropout Operation
<1µA Shutdown Current
Small External Components
Ultra-Small TDFN22-8 or STDFN22-8
Package
Temperature Range: -40°C to +85°C
Applications
Bluetooth™ Headsets
Cellular Phones
Digital Cameras
Handheld Instruments
Portable Music Players
USB Devices
Typical Application
V
IN
AAT1121
VP
VIN
C
1
4.7µF
EN
FB
LX
L1
3.0μH
R
1
118kΩ
R
2
59kΩ
C
2
4.7µF
V
O
= 1.8V
250mA
GND
PGND
1121.2007.03.1.2
1

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