AAT1265_07 Datasheet, PDF (1/13 Pages) Advanced Analogic Technologies – Low Voltage 2MHz Step-Up DC/DC Converter in SC70JW Package

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PRODUCT DATASHEET
AAT1265
Low Voltage 2MHz Step-Up DC/DC Converter in SC70JW 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.
Features
• 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
Applications
• Bluetooth^® Headsets
• Digital Cameras
• Medical Instruments
• Mobile Handsets
• MP3 and Portable Music Players
Typical Application
V_IN
2.2μH
AAT1265
LX
VCC
V_OUT
4.7μF
VIN
OUT
EN
GND
4.7μF
100
90
80
70
60
50
0.1
Dual-Cell to 3.3V Efficiency
vs. Output Current
V_IN = 3.0V
V_IN = 2.4V V_IN = 2.0V
1.0
10.0
100.0
Output Current (mA)
1000.0
1265.2007.12.1.4
www.analogictech.com
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