AAT1232 Datasheet, PDF (1/17 Pages) Advanced Analogic Technologies – 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™ (S²Cwire™) 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.
Typical Application
AAT1232
24V 100mA Step-Up Converter
Features
SwitchReg^™
• 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
• CCD Bias Circuit
• Digital Still Cameras
• LCD Bias Circuit
• Mobile Handsets
• MP3 Players
• OLED Displays
• PDAs and Notebook PCs
Input:
2.7V~5.5V
C₁
2.2µF
VP
LIN
VIN
AAT1232
SW
PGND
FB1
EN/SET
FB2
SEL _GND
L₁
2.2µH
D₁
Schottky 24V @ 100mA
R₁
576kΩ
R₂
10.0kΩ
R₃
20.0kΩ
C₂
2.2µF, 25V
1232.2006.12.1.3
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