PRODUCT DATASHEET
AAT1265
SwitchReg
TM
Low Voltage 2MHz Step-Up DC/DC Converter in SC70JW Package
Features
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100mA Output from a Single AA Cell Input
250mA Output from a Dual AA Cell Input
400mA Output from a Single Lithium-Ion Cell Input
V
IN
Operation Range: 0.8V to V
OUT
Up to 93% Efficiency
Low Start-Up Voltage: 1.0V Typical
Internal Synchronous Rectifier
Current Mode Control with Internal Feedback and
Compensation
2MHz Fixed Switching Frequency
1A Current Limit
Maintains High Efficiency Over the Output Current
Range for Improved Battery Life
Low 40μA No Load Bias Current
True Load Disconnect
Short-Circuit and Over-Current Protection
Inrush Current Limit and Soft Start
Low Shutdown Current: <1.0μA
-40°C to +85°C Temperature Range
2.0x2.1mm SC70JW-8 Package
General Description
The AAT1265 is designed for single-cell or dual-cell alka-
line, NiMH, or NiCd or single-cell lithium-ion/polymer
(Li-Ion) battery-powered applications. It is a high effi-
ciency, synchronous, fixed frequency, step-up converter
with true output disconnect during shutdown (<1.0μA),
start-up inrush current limit, and short-circuit protection.
The high 2MHz switching frequency and completely inte-
grated control circuitry minimize the total solution foot-
print area while maintaining excellent regulation, ripple,
and transient response throughout the full load range.
Light load switching frequency modulation and low qui-
escent current maintain high efficiency performance for
light load and sleep mode conditions.
With a 1A peak switch current limit, the AAT1265 is
capable of delivering 100mA to the load with a single AA
cell, up to 250mA from a dual AA cell, or up to 400mA
from a single-cell lithium-ion battery. The device has a
1.0V start-up voltage with operation down to 0.8V.
The AAT1265 is available in a Pb-free, space-saving
2.0x2.1mm 8-pin SC70JW package and is rated over the
-40°C to +85°C temperature range.
Applications
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Bluetooth
®
Headsets
Digital Cameras
Medical Instruments
Mobile Handsets
MP3 and Portable Music Players
Typical Application
V
IN
2.2μH
LX
AAT1265
VCC
Efficiency (%)
V
OUT
100
Dual-Cell to 3.3V Efficiency
vs. Output Current
V
IN
= 3.0V
90
80
VIN
OUT
4.7μF
V
IN
= 2.4V
70
60
V
IN
= 2.0V
4.7μF
EN
GND
50
0.1
1.0
10.0
100.0
1000.0
Output Current (mA)
1265.2007.12.1.4
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