PRODUCT DATASHEET
AAT1130
SwitchReg
TM
General Description
The AAT1130 SwitchReg™ is a member of AnalogicTech’s
Total Power Management IC™ product family. It is a
fixed-frequency (during steady-state operation), cur-
rent-mode step-down converter. The unique architecture
improves transient response while allowing tiny passive
LC filter components. The high switching frequency (up
to 2.5MHz) keeps output voltage ripple low.
The AAT1130 delivers up to 500mA of output current,
while consuming only 60μA of quiescent current. The
current-mode control circuit operates at a fixed switch-
ing frequency in steady-state operation. It allows the
control circuit to react nearly instantly for improved tran-
sient response and is stable with LC components as
small as 1μH and 4.7μF. The AAT1130 regulates an out-
put voltage between 0.6V and 1.8V from an input volt-
age of 2.7V to 5.5V. The AAT1130 is available in either
fixed or adjustable output regulation voltage options, for
the adjustable version the output voltage is set by an
external resistor voltage divider circuit. Internal MOSFET
switches reduce the overall solution size while maintain-
ing high efficiency over a wide load current range.
The AAT1130 is available in a space saving 2.0x2.2mm
SC70JW-10 package, and is rated over the -40°C to
85°C temperature range.
2.5MHz 500mA Step-Down DC/DC Converter
Features
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2.5MHz Switching Frequency
Input Voltage Range: 2.7V to 5.5V
Output Voltage Range: 0.6V to 1.8V
High 92% Peak Efficiency (V
IN
= 3.6V, V
OUT
= 1.8V)
Low 60μA Quiescent Current
500mA Maximum Continuous Output Current
Fast Transient Response with Small LC Output Filter
Components
Fixed and Adjustable Output Voltage Options
Internal Soft-Start
Anti-Ringing Switch to Reduce EMI During Discontinuous
Conduction Mode Operation
Over-Temperature Protection
Valley Current Limit Protection
Available in SC70JW-10
-40°C to 85°C Temperature Range
Applications
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Microprocessor/DSP Core and I/O
Mobile Phones
PDAs and Handheld Computers
Digital Cameras
Portable Music Players
Handheld Games
Handheld Instruments
Typical Application
L = 1μH
Input:
2.7V to 5.5V
C
IN
VCC/VP
LX
Output:1.2V,
500mA max
AAT1130-12
(SC70JW)
VOUT
C
OUT
= 4.7μF
EN
PGND
GND
1130.2008.08.1.1
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