AAT1142IWP-1.8-T1 View Datasheet(PDF) - Advanced Analogic Technologies
Part Name
Description
MFG CO.
'AAT1142IWP-1.8-T1' PDF : 21 Pages View PDF
SwitchRegTM
PRODUCT DATASHEET
AAT1142
800mA Voltage-Scaling Step-Down Converter
General Description
The AAT1142 SwitchReg is a dynamically programmable
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 foot-
print make the AAT1142 the ideal choice for micropro-
cessor core power in systems such as smartphones.
The 2.2MHz switching frequency allows the use of a
small external inductor and capacitors. Peak current
mode control and internal compensation provide stable
operation and fast voltage response without over/under-
shoot or ringing.
The AAT1142 delivers up to 800mA of output current
while consuming 35μA of typical no load quiescent cur-
rent. 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.
The AAT1142 optimizes power efficiency throughout 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-
temperature and short-circuit protection safeguard the
AAT1142 and system components from damage.
The AAT1142 is available in a Pb-free, space-saving
2.85x3.0x1.0mm TSOPJW-12 package or a Pb-free, low-
profile 3x3x0.8mm TDFN33-12 package. The device is
rated over the -40°C to +85°C temperature range.
Typical Application
Features
• VIN Range: 2.7V to 5.5V
• VOUT Programmable Range: 0.6V to 2.0V
• Dynamic Voltage Management:
▪ 50mV Output Resolution
▪ Fast, Stable Response
• Serial Control Options:
▪ I2C Two-Wire Interface
▪ S2Cwire Single-Wire Interface
• 800mA Output Current
• 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
• 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
Applications
• Camcorders
• Cellular Phones and Smartphones
• Digital Still Cameras
• Handheld Instruments
• Microprocessor / DSP Core
• MP3, Portable Music, and Portable Media Players
• PDAs and Handheld Computers
VIN: 2.7V to 5.5V
C2
4.7μF
VIN
LX
AAT1142
FB
I 2C
S2Cwire*
*Optional S2Cwire or I2C Input
MODE/SYNC
SDA
SCL
EN/SET
AGND
PGND
VOUT: 0.6V to 2.0V
800mA Maximum
L1
2.2μH
C1
10μF
Efficiency vs. Load
(VOUT = 1.8V)
100
90 VIN = 3.6V VIN = 2.7V
80
70
VIN = 4.2V
60
VIN = 5.0V
50
40
PWM Only
Mode
30
0
1
10
100
1000
Output Current (mA)
1142.2009.08.1.1
www.analogictech.com
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