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AAT1265 Datasheet(PDF) 9 Page - Advanced Analogic Technologies

Part # AAT1265
Description  Low Voltage 2MHz Step-Up DC/DC Converter in SC70JW Package
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Manufacturer  ANALOGICTECH [Advanced Analogic Technologies]
Direct Link  http://www.analogictech.com
Logo ANALOGICTECH - Advanced Analogic Technologies

AAT1265 Datasheet(HTML) 9 Page - Advanced Analogic Technologies

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AAT1265
Low Voltage 2MHz Step-Up DC/DC Converter in SC70JW Package
SwitchRegTM
PRODUCT DATASHEET
1265.2007.12.1.4
9
www .analogictech.com
Functional Description
The AAT1265 synchronous step-up converter is targeted
for single- or dual-cell alkaline, NiMH, and NiCd and
single-cell lithium-ion/polymer battery applications. It
has a 1V typical start-up voltage with operation after
start-up to less than 0.8V.
The high 2MHz switching frequency of the AAT1265
facilitates output filter component size reduction for
improved power density and reduced overall footprint. It
also provides greater bandwidth and improved transient
response over other lower frequency step-up converters.
The compensation and feedback is integrated with only
three external components (CIN, COUT, L).
Low RDS(ON) synchronous power switches provide high
efficiency for heavy load conditions. Switching frequency
modulation and low quiescent current maintains this
high efficiency for light load and sleep mode conditions.
In addition to the improved efficiency, the synchronous
boost has the added performance advantage of true load
disconnect during shutdown (<1μA shutdown current),
inrush current limit, and short-circuit protection.
PWM / Light Load Control
The AAT1265 is a fixed frequency PWM peak current mode
control step-up converter. For light load conditions (10 to
20mA and below), the converter transitions to a variable
Functional Block Diagram
Voltage
Reference
Logic
DH
DL
V
REF
OUT
GND
EN
GND
LX
Comp.
VIN
VCC
Mode
Control
Low Voltage
Start-Up
Start-Up
Inrush Control
Current
Sense
Error
Amp.
2MHz
Oscillator


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