AAT2786
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器件描述：1.5A Step-Down Converter and 150mA LDO
器件厂商：ANALOGICTECH [
Advanced Analogic Technologies]
厂商主页：http://www.analogictech.com/
文件大小：3398.78KB
文件页数：27
PDF阅读：AAT2786.pdf (点击阅读器件资料)
摘要：
AAT2786
1.5A Step-Down Converter and 150mA LDOSystemPower
TM
PRODUCT DATASHEET
2786.2008.04.1.0 1www.analogictech.com
General Description
The AAT2786 is a dual output power solution. It includes
a 1.5A, 1.4MHz, high-efficiency step-down converter and
a high performance 150mA LDO regulator. The step-
down regulator output voltage is adjustable from 0.6V to
V
IN
. The LDO regulator has a factory preset fixed output
voltage from 1.2V to 3.3V.
The step-down converter consumes only 42?A of no-load
quiescent current and is designed to maintain high effi-
ciency throughout the load range. The step-down con-
verter has ultra-low R
DS(ON)
integrated MOSFETs and can
operate up to 100% duty cycle to enable high output
voltage, high current applications which require a low
dropout threshold. The AAT2786 provides excellent tran-
sient response and high output accuracy across the
operating range. Pulling the MODE/SYNC pin high
enables “PWM Only” mode, maintaining constant fre-
quency and low output ripple across the operating range.
Alternatively, the converter may be synchronized to an
external clock input via the MODE/SYNC pin.
The MicroPower low dropout linear regulator in the
AAT2786 has been specifically designed for high-speed
turn-on and turn-off performance, fast transient response,
and good noise and power supply ripple rejection (PSRR),
making it ideal for powering sensitive circuits with fast
switching requirements.
Over-temperature and short-circuit protection safeguard
the AAT2786 and system components from damage.
Features
? V
IN
Range : 2.5V to 5.5V
? 1.5A Step-Down Converter
?
V
OUT
Range: 0.6V to V
IN
?
95% Peak Efficiency
?
High Efficiency across load range
?
42?A No Load Quiescent Current
?
Optional “PWM Only” Low Noise Mode
?
Current limit and soft start
? 150mA LDO Regulator
?
V
OUT
Range: 1.2V to 3.3V (Fixed)
?
High Power Supply Rejection Ratio
?
Low Output Noise
? Independent Enable Pins
? Integrated Power MOSFETs
? Over-Temperature Protection
? TDFN34-16 Package
? -40°C to +85°C Temperature Range
Applications
? Cellular and Smart Phones
? PDAs, Palmtops
? Digital Still and Video Cameras
? Portable Instruments
? Battery-Powered Applications
Typical Application
R2
Adj
R3
59k
C8
10nF
C6
1?F
3.3?H
L1
C1
opt
C7
2.2?F
BUCK OUT
LDO OUTLDO IN
BUCK IN
C5
Opt C4
22?F
C3
1?F
R1
100
C2
10?F
VIN
12
MODE/SYNC
14
VP
16
VP
15
LDOIN
11
BUCK_EN
13
LDO_EN
9
N/C
10
LDO_OUT
6
BYP
8
LX
2
LX
1
GND
4
PGND
3
LDO_GND
7
FB
5
AAT2786IRN
U1
ON/OFF
ON/OFF
ON/OFF
