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器件描述：1MHz Step-Down Converter/LDO Regulator
器件厂商：ANALOGICTECH [Advanced Analogic Technologies]
厂商主页：http://www.analogictech.com/
文件大小：862.03KB
文件页数：26
PDF阅读：AAT2500IWP-ET-T1.pdf (点击阅读器件资料)
摘要：
AAT2500
1MHz Step-Down Converter/LDO Regulator
2500.2006.05.1.16 1
SystemPower
?
Typical Application
AAT2500 Step-Down Converter Efficiency
Load Current (mA)
Efficiency (%)
60
65
70
75
80
85
90
95
100
0.1 1 1 0 100 1000
V
IN
= 3.3V
1.8V
2.5V
4. 7 ? H
L1
4. 7 ? F
C1
2.2 ? F
C4
10 ? F
C3
10n F
C5
PGND
1
LX
2
VP
3
VCC
4
ENLDO
9
EN
10
FB
11
SGND
12
VLDO
5
OUT
6
GND
8
BYP
7
AA T 2 500
U1
L 1 S u m i da C D R H 3D 16- 4 R 7 C 1 M u r a t a GR M 2 1 9 R 6 1A 475 KE 19
C 3 M u r a t a GR M 21B R 60J 106 KE 1 9
V
IN
= 2.7V to 5.5V
3.3V at 300mA
2.5V at 400mA
General Description
The AAT2500 is a member of AnalogicTech's Total
Power Management IC? (TPMIC?) product fam-
ily. It is a low dropout (LDO) linear regulator and a
step-down converter with an input voltage range of
2.7V to 5.5V, making it ideal for applications with
single lithium-ion/polymer batteries.
The LDO has an independent input and is capable
of delivering up to 300mA. The linear regulator has
been designed for high-speed turn-on and turn-off
performance, fast transient response, and good
power supply rejection ratio (PSRR). Other fea-
tures include low quiescent current and a low
dropout voltage.
The 400mA step-down converter is designed to
minimize external component size and cost while
maintaining a low 25?A no load quiescent current.
Peak current mode control with internal compen-
sation provides a stable converter with a low equiv-
alent series resistance (ESR) ceramic output
capacitor for extremely low output ripple.
For maximum battery life, the step-down converter
increases to 100% duty cycle and has a typical
180mV dropout voltage at 400mA. The output volt-
age is either fixed or adjustable with an integrated
P- and N-channel MOSFET power stage and
1MHz switching frequency.
The AAT2500 is available in a 12-pin TDFN33 or
STDFN33 package, and is rated over a tempera-
ture range of -40°C to +85°C.
Features
?V
IN
Range: 2.7V to 5.5V
? 300mA LDO Current Output
? 400mV LDO Dropout Voltage at 300mA
? High Output Accuracy: ±1.5%
? Fast LDO Line / Load Transient Response
? 400mA, 96% Efficiency Step-Down Converter
? 25?A No Load Quiescent Current for Step-
Down Converter
? Shutdown Current <1?A
? Low R
DS(ON)
0.4Ω Integrated Power Switches
? Low Dropout 100% Duty Cycle
? 1MHz Switching Frequency
? Internal Soft Start
? Over-Temperature Protection
? Current Limit Protection
? Available in TDFN33-12 or STDFN33-12
Package
? -40°C to +85°C Temperature Range
Applications
? Cellular Phones
? Digital Cameras
? Handheld Instruments
? Microprocessor/DSP Core/IO Power
? PDAs and Handheld Computers
? Portable Media Players
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