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AAT1143IJS-0.6-T1 参数 Datasheet PDF下载

AAT1143IJS-0.6-T1图片预览
型号: AAT1143IJS-0.6-T1
PDF下载: 下载PDF文件 查看货源
内容描述: 1MHz的400毫安降压转换器 [1MHz 400mA Step-Down Converter]
分类和应用: 转换器
文件页数/大小: 20 页 / 782 K
品牌: ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
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1MHz 400mA Step-Down Converter
General Description
The AAT1143 SwitchReg™ 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
Features
SwitchReg
V
IN
Range: 2.7V to 5.5V
V
OUT
Adjustable Down to 0.6V
— 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)
V
IN
3
1
V
O
U1
AAT1143
VIN
EN
AGND
PGND
LX
OUT
PGND
PGND
4
2
7
6
Efficiency vs. Load Current
(V
OUT
= 2.5V; V
IN
= 3.3V)
100
95
L1
4.7μH
C1
4.7μF
Efficiency (%)
90
85
80
75
70
65
60
0.1
1
10
100
1000
C2
4.7μF
5
8
Output Current (mA)
1143.2006.07.1.10
1