AAT1112 Datasheet, PDF (1/19 Pages) Advanced Analogic Technologies – 1.5A, 1.4MHz Step-Down Converter

General Description
The AAT1112 SwitchReg is a 1.5A step-down converter
with an input voltage range of 2.4V to 5.5V and an
adjustable output voltage from 0.6V to V_IN. The 1.4MHz
switching frequency enables the use of small external
components. The small footprint and high efficiency make
the AAT1112 an ideal choice for portable applications.
The AAT1112 delivers 1.5A maximum output current
while consuming only 42μA of no-load quiescent current.
Ultra-low R_DS(ON) integrated MOSFETs and 100% duty
cycle operation make the AAT1112 an ideal choice for
high output voltage, high current applications which
require a low dropout threshold.
The AAT1112 provides excellent transient response and
high output accuracy across the operating range. No
external compensation components are required.
The AAT1112 is designed to maintain high efficiency
throughout the load range. Pulling the MODE/ SYNC pin
high enables “PWM Only” mode, maintaining constant
frequency and low output ripple 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
AAT1112 and system components from damage.
The AAT1112 is available in a Pb-free, space-saving
TDFN33-12 or 2.85 x 3mm TSOPJW-12 package. The
product is rated over an operating temperature range of
-40°C to +85°C.
DATA SHEET
AAT1112
1.5A, 1.4MHz Step-Down Converter
Features
• 1.5A Maximum Output Current
• Input Voltage: 2.4V to 5.5V
• Output Voltage: 0.6V to V_IN
• Up to 95% Efficiency
• 42μA No Load Quiescent Current
• No External Compensation Required
• 1.4MHz Switching Frequency
• Synchronizable to External Clock
• Optional “PWM Only” Low Noise Mode
• 100% Duty Cycle Low-Dropout Operation
• Internal Soft Start
• Over-Temperature and Current Limit Protection
• <1μA Shutdown Current
• TSOPJW-12 or TDFN33-12 Package
• Temperature Range: -40°C to +85°C
Applications
• Cellular Phones
• Digital Cameras
• Hard Disk Drives
• MP3 Players
• PDAs and Handheld Computers
• Portable Media Players
• USB Devices
Typical Application
V_IN
C₂
10μF
VP
LX
AAT1112
VIN
EN
FB
MODE/SYNC
GND
PGND
L₁
3.3μH
V_OUT= 3.3V
R₁
267kΩ
R₂
59kΩ
C₁
22μF
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
201972B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013
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