AAT1299 Datasheet, PDF (8/14 Pages) Analog Devices – Low Voltage 2MHz Step-Up DC/DC Converter

AAT1299
Low Voltage 2MHz Step-Up DC/DC Converter
Functional Block Diagram
VCC
VIN
OUT
V_REF
Voltage
Reference
Start-Up
Inrush Control
Low Voltage
Start-Up
Mode
DH
Control
LX
2MHz
Logic
Oscillator
Current
Sense
Comp.
DL
Error
Amp.
GND
EN
GND
Functional Description
The AAT1299 synchronous step-up converter is
targeted for single- or dual-cell alkaline, NiMH, and
NiCd battery applications. It has a 1V typical start-
up voltage.
The high 2MHz switching frequency of the
AAT1299 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 (C_IN, C_OUT, L).
Low R_DS(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 synchro-
nous boost has the added performance advantage
of inrush current limit and short-circuit protection.
8
1299.2007.06.1.0