AAT1299 Analog Devices, AAT1299 Datasheet - Page 8

• Manufacturer Part Number: AAT1299
• Description: Low Voltage 2MHz Step-Up DC/DC Converter
• Manufacturer: Analog Devices

Functional Block Diagram
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
8
GND
VCC
Reference
Voltage
Amp.
Error
V
Current
Sense
REF
Low Voltage 2MHz Step-Up DC/DC Converter
Inrush Control
Start-Up
Oscillator
Control
2MHz
Mode
Comp.
EN
frequency step-up converters. The compensation
and feedback is integrated with only three external
components (C
Low R
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.
Low Voltage
Start-Up
Logic
VIN
DS(ON)
synchronous power switches provide
IN
DH
DL
, C
OUT
OUT
GND
, L).
LX
AAT1299
1299.2007.06.1.0