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參數(shù)資料
| 型號： | AAT1157IVN-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | 1MHz 1.2A Buck DC/DC Converter |
| 中文描述： | 1MHz的1.2A的降壓DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 1/14頁 |
| 文件大小： | 394K |
| 代理商： | AAT1157IVN-T1 |
AAT1157
1MHz 1.2A Buck DC/DC Converter
1157.2005.11.1.4
1
SwitchReg
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.
Features
V
IN
Range: 2.7V to 5.5V
Up to 95% Efficiency
110 m
R
DS(ON)
Internal Switches
<1μA Shutdown Current
1MHz Buck Switching Frequency
Fixed or Adjustable V
OUT
≥
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
3.0
μ
H
L1
2x 22
μ
F
C3-C4
10
μ
F
C1
100
R1
0.1
μ
F
C2
2.5V
3.3V
187k
59k
R4
LX
14
N/C
6
EN
7
VCC
9
VP
10
N/C
8
LX
13
PGND
3
VP
12
VP
11
FB
4
LX
15
PGND
2
PGND
1
SGND
5
N/C
16
AAT1157
U1
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