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| AAT1121 Datasheet, PDF (1/20 Pages) Advanced Analogic Technologies – 1.5MHz, 250mA Step-Down Converter | |||
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AAT1121
1.5MHz, 250mA Step-Down Converter
General Description
The AAT1121 SwitchReg is a member of
AnalogicTech's Total Power Management ICâ¢
(TPMICâ¢) product family. It 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 fre-
quency 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 package and is rated over the -40°C
to +85°C temperature range.
Features
SwitchRegâ¢
⢠VIN Range: 2.7V to 5.5V
⢠VOUT Range: 0.6V to VIN
⢠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 Package
⢠Temperature Range: -40°C to +85°C
Applications
⢠Bluetooth⢠Headsets
⢠Cellular Phones
⢠Digital Cameras
⢠Handheld Instruments
⢠Portable Music Players
⢠USB Devices
Typical Application
VIN
C1
4.7µF
AAT1121
VP
LX
VIN
EN
FB
GND PGND
VO = 1.8V
L1
3.0μH
R1
118kΩ
250mA
R2
59kΩ
C2
4.7µF
1121.2006.04.1.0
1
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