Low Voltage 2MHz Step-Up DC/DC
Converter in SC70JW Package
General Description
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.
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.
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 a 3.3V load with a
single AA cell or up to 250mA from a dual AA cell.
The device has a 1.0V start-up voltage with opera-
tion down to 0.8V.
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.
AAT1265
Features
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SwitchReg
™
100mA Output from a Single AA Cell Input
250mA Output from a Dual AA 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
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
V
OUT
100
Dual-Cell to 3.3V Efficiency
vs. Output Current
V
IN
= 3.0V
90
Efficiency (%)
VCC
80
VIN
OUT
4.7µF
V
IN
= 2.4V
70
60
50
0.1
1.0
10.0
V
IN
= 2.0V
4.7µF
EN
GND
100.0
1000.0
Output Current (mA)
1265.2006.05.1.1
1
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
