24V 100mA Step-Up Converter
General Description
The AAT1232 is a high frequency, high efficiency
boost converter capable of 24V maximum output
voltage. The internal power switch can deliver
100mA load current. It is the ideal power solution to
power OLED, LCD, and CCD applications operat-
ing from a single cell lithium-ion battery.
The high switching frequency (up to 2MHz) pro-
vides fast response to load transients with small
external components. The fully integrated control
IC simplifies the design while reducing the total
PCB footprint. The AAT1232 offers a true load dis-
connect feature which isolates the load from the
power source when EN/SET is pulled low. This
eliminates leakage current and maintains zero volt-
age at the output while disabled.
The output voltage can be dynamically set by acti-
vating one of two reference levels (FB1 or FB2)
through the SEL logic pin. Optionally, AnalogicTech’s
Simple Serial Control™ (S
2
Cwire™) interface pro-
vides dynamic programmability across a wide output
voltage range through the EN/SET pin.
The AAT1232 is available in a Pb-free, thermally-
enhanced 16-pin 3x4mm TDFN low-profile pack-
age or a Pb-free 12-pin TSOPJW package.
AAT1232
Features
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•
•
SwitchReg
™
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•
•
•
•
•
•
•
•
•
V
IN
Range: 2.7V to 5.5V
Maximum Output: 24V @ 100mA
True Load Disconnect
Dynamic Voltage Control Options
Hysteretic Control
— No External Compensation Components
— Excellent Load Transient Response
— High Efficiency at Light Load
Up to 2MHz Switching Frequency
Ultra-Small Inductor and Capacitors
Integrated Low R
DS(ON)
MOSFET Switches
Up to 85% Efficiency
<1µA Shutdown Current
Integrated Soft Start
Cycle-by-Cycle Current Limit
Short-Circuit, Over-Temperature Protection
Available in TSOPJW-12 or TDFN34-16
Package
-40°C to +85°C Temperature Range
Applications
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CCD Bias Circuit
Digital Still Cameras
LCD Bias Circuit
Mobile Handsets
MP3 Players
OLED Displays
PDAs and Notebook PCs
Typical Application
L
1
2.2µH
Input:
2.7V~5.5V
VP
LIN
D
1
Schottky
24V @ 100mA
C
1
2.2µF
VIN
AAT1232
SW
FB1
R
1
576kΩ
R
2
10.0kΩ
R
3
20.0kΩ
C
2
2.2µF, 25V
PGND
EN/SET
SEL
GND
FB2
1232.2006.12.1.3
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ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
