AAT1265
器件描述：Low Voltage 2MHz Step-Up DC/DC Converter in SC70JW Package
器件厂商：ANALOGICTECH [Advanced Analogic Technologies]
文件大小：382.84KB，共13页
Sponsor by e络盟器件资料摘要：
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.
Features
• 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
AAT1265
Low Voltage 2MHz Step-Up DC/DC
Converter in SC70JW Package
Typical Application
Dual-Cell to 3.3V Efficiency
vs. Output Current
Output Current (mA)
Efficiency (%)
50
60
70
80
90
100
0.1 1.0 10.0 100.0 1000.0
V
IN
= 3.0V
V
IN
= 2.4V V
IN
= 2.0V
2.2µH
4.7µF
4.7µ F
V
IN
V
OUT
VCC
EN
VIN
LX
OUT
GND
AAT1265
1265.2006.05.1.1 1
SwitchReg
™
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.
Features
• 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
AAT1265
Low Voltage 2MHz Step-Up DC/DC
Converter in SC70JW Package
Typical Application
Dual-Cell to 3.3V Efficiency
vs. Output Current
Output Current (mA)
Efficiency (%)
50
60
70
80
90
100
0.1 1.0 10.0 100.0 1000.0
V
IN
= 3.0V
V
IN
= 2.4V V
IN
= 2.0V
2.2µH
4.7µF
4.7µ F
V
IN
V
OUT
VCC
EN
VIN
LX
OUT
GND
AAT1265
1265.2006.05.1.1 1
SwitchReg
™