AAT1142
800mA Voltage-Scaling Step-Down Converter
™
SwitchReg
General Description
Features
The AAT1142 SwitchReg is a dynamically pro-
grammable 2.2MHz step-down converter with an
input voltage range of 2.7V to 5.5V and output from
0.6V to 2.0V. Its low supply current, high level of
integration, and small footprint make the AAT1142
the ideal choice for microprocessor core power in
systems such as smartphones.
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VIN Range: 2.7V to 5.5V
VOUT Programmable Range: 0.6V to 2.0V
Dynamic Voltage Management:
— 50mV Output Resolution
— Fast, Stable Response
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Serial Control Options:
— I2C Two-Wire Interface
— S2Cwire Single-Wire Interface
800mA Output Current
The 2.2MHz switching frequency allows the use of
a small external inductor and capacitors. Peak cur-
rent mode control and internal compensation pro-
vide stable operation and fast voltage response
without over/undershoot or ringing.
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Up to 93% Efficiency
Line, Load Regulation Less Than ±0.5%
2.2MHz Switching Frequency
Ultra-Small External Filter
Low 35µA No Load Quiescent Current
100% Duty Cycle Low Dropout Operation
Internal Soft Start
The AAT1142 delivers up to 800mA of output current
while consuming 35µA of typical no load quiescent
current. Dynamic Voltage Management is provided
through I2C or AnalogicTech's S2Cwire™ (Simple
Serial Control™) single wire interface. The user can
program the output from 0.6V to 2.0V in 50mV steps.
Over-Temperature Protection
Current Limit Protection
Multi-Function MODE/SYNC Pin:
— PFM/PWM for High Efficiency
— PWM Only for Low Noise
— Clock Input to Synchronize to System Clock
TSOPJW-12 or TDFN33-12 Package
Temperature Range: -40°C to +85°C
The AAT1142 optimizes power efficiency through-
out the load range via PWM/PFM mode. Pulling
the MODE/SYNC pin high enables PWM Only
mode, maintaining constant frequency and low
noise across the operating range. Alternatively, the
converter may be synchronized to an external
clock input via the MODE/SYNC pin. Over-temper-
ature and short-circuit protection safeguard the
AAT1142 and system components from damage.
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Applications
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Camcorders
Cellular Phones and Smartphones
Digital Still Cameras
The AAT1142 is available in a Pb-free, space-sav-
ing 2.85x3.0x1.0mm TSOPJW-12 package or a
Pb-free, low-profile 3x3x0.8mm TDFN33-12 pack-
age. The device is rated over the -40°C to +85°C
temperature range.
Handheld Instruments
Microprocessor / DSP Core
MP3, Portable Music, and Portable Media
Players
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PDAs and Handheld Computers
Typical Application
Efficiency vs. Load
(VOUT = 1.8V)
VOUT: 0.6V to 2.0V
VIN: 2.7V to 5.5V
800mA Maximum
100
L1
VIN = 2.7V
VIN = 3.6V
VIN
LX
FB
90
80
70
60
50
40
30
2.2µH
C2
4.7µF
AAT1142
VIN = 4.2V
C1
10µF
MODE/SYNC
VIN = 5.0V
PWM Only
Mode
PGND
SDA
I2C
SCL
S2Cwire*
EN/SET
AGND
0
1
10
100
1000
*Optional S2Cwire or I2C Input
Output Current (mA)
1142.2006.07.1.0
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