AAT1265
Low Voltage 2MHz Step-Up DC/DC
Converter in SC70JW Package
™
SwitchReg
General Description
Features
The AAT1265 is a member of Analogic Tech's Total
Power Management IC™ (TPMIC™) product family
and is designed for single-cell or dual-cell alkaline,
NiMH, or NiCd battery-powered applications. It is a
high efficiency, synchronous, fixed frequency, step-
up converter with true output disconnect during
shutdown (<1.0µA), start-up inrush current limit, and
short-circuit protection.
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100mA Output from a Single AA Cell Input
250mA Output from a Dual AA Cell Input
VIN Operation Range: 0.8V to VOUT
Up to 93% Efficiency
Low Start-Up Voltage: 1.0V Typical
Internal Synchronous Rectifier
Current Mode Control with Internal Feedback
and Compensation
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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
The high 2MHz switching frequency and completely
integrated control circuitry minimize the total solution
footprint area while maintaining excellent regulation,
ripple, and transient response throughout the full
load range.
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Light load switching frequency modulation and low
quiescent current maintain high efficiency perform-
ance 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 sin-
gle AA cell or up to 250mA from a dual AA cell. The
device has a 1.0V start-up voltage with operation
down to 0.8V.
Applications
The AAT1265 is available in a Pb-free, space-sav-
ing 2.0x2.1mm 8-pin SC70JW package and is
rated over the -40°C to +85°C temperature range.
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Bluetooth™ Headsets
Digital Cameras
Medical Instruments
Mobile Handsets
MP3 and Portable Music Players
Typical Application
Dual-Cell to 3.3V Efficiency
vs. Output Current
VIN
VOUT
100
90
80
70
60
50
AAT1265
VIN = 3.0V
2.2µH
LX
VCC
OUT
GND
VIN = 2.4V VIN = 2.0V
VIN
EN
4.7µF
4.7µF
0.1
1.0
10.0
100.0
1000.0
Output Current (mA)
1265.2006.06.1.2
1