AAT1265 Datasheet, PDF (1/13 Pages) Advanced Analogic Technologies – 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
Low Voltage 2MHz Step-Up DC/DC
Converter in SC70JW Package
Features
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
• Bluetooth™ Headsets
• Digital Cameras
• Medical Instruments
• Mobile Handsets
• MP3 and Portable Music Players
Typical Application
V_IN
2.2µH
4.7µF
AAT1265
LX
VCC
V_OUT
VIN
OUT
EN
GND
4.7µF
1265.2006.05.1.1
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
1