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| AAT1143 Datasheet, PDF (1/20 Pages) Advanced Analogic Technologies – 1MHz 400mA Step-Down Converter | |||
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General Description
The AAT1143 SwitchReg⢠is a member of
AnalogicTech's Total Power Management ICâ¢
(TPMICâ¢) product family. It is a 1MHz step-down
converter with an input voltage range of 2.7V to
5.5V and output as low as 0.6V. Its low supply cur-
rent, small size, and high switching frequency
make the AAT1143 the ideal choice for portable
applications.
The AAT1143 is available in either a fixed version
with internal feedback or a programmable version
with external feedback resistors. It can deliver
400mA of load current while maintaining a low
25µA no load quiescent current. The 1MHz switch-
ing frequency minimizes the size of external com-
ponents while keeping switching losses low. The
AAT1143 feedback and control delivers excellent
load regulation and transient response with a small
output inductor and capacitor.
The AAT1143 is designed to maintain high efficien-
cy throughout the operating range, which is critical
for portable applications.
The AAT1143 is available in a space-saving
2.0x2.1mm SC70JW-8 package and is rated over
the -40°C to +85°C temperature range.
AAT1143
1MHz 400mA Step-Down Converter
Features
SwitchRegâ¢
⢠VIN Range: 2.7V to 5.5V
⢠VOUT Adjustable Down to 0.6V
â Fixed or Adjustable Version
⢠25µA No Load Quiescent Current
⢠Up to 95% Efficiency
⢠400mA Max Output Current
⢠1MHz Switching Frequency
⢠Soft Start
⢠Over-Temperature Protection
⢠Current Limit Protection
⢠100% Duty Cycle Low-Dropout Operation
⢠0.1µA Shutdown Current
⢠SC70JW-8 Package
⢠Temperature Range: -40°C to +85°C
Applications
⢠Cellular Phones
⢠Digital Cameras
⢠Handheld Instruments
⢠Microprocessor / DSP Core / IO Power
⢠PDAs and Handheld Computers
⢠USB Devices
Typical Application (Fixed Output Voltage)
VIN
C2
4.7µF
U1
AAT1143
3 VIN
LX 4
1 EN
OUT 2
5 AGND PGND 7
8 PGND PGND 6
L1
4.7µH
VO
C1
4.7µF
AAT1143 Efficiency
(VOUT = 2.5V; L = 4.7µH)
100
VIN = 3.3V
90
80
70
60
0.1
1
10
100
1000
Output Current (mA)
1143.2005.09.1.7
1
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