OZ9902C View Datasheet(PDF) - O2Micro International
Part Name
Description
MFG CO.
'OZ9902C' PDF : 56 Pages View PDF
OZ528
FEATURES
• High power DC/DC power
converter
• Operation frequency
synchronization
• Optional spread spectrum
operation frequency
• Thermal, over-current, and over
load protection
• Abnormal pulled-up output
protection
• LED fault status output
Buck Converter
• Integrated power MOSFET
• Current mode control
• Soft start function
Two Independent Boost
Converters
• Integrated power MOSFET
• Current mode control
• Wide output range: up to 25.0V
• Adjustable power on/off delay time
• Soft start function
Negative Charge Pump
• Voltage mode control
• Adjustable power on/off delay time
GENERAL DESCRIPTION
The OZ528 is a LCD panel bias power supply controller, suitable for GPS ap-
plication. It generates four voltage rails for a TFT LCD panel. It includes a boost
converter to provide the source voltage, buck converter to provide the logic
voltage for the system, boost converter for positive gate voltage and a negative
charge-pump driver to provide adjustable regulated output voltages to bias the
TFT panel.
OZ528 has power-on sequencing. The buck converter is the first to start after
the IC is enabled. Two boost converters and a negative charge-pump are en-
abled when their corresponding TIMER reaches approximately 2.0V.
APPLICATIONS
APPLICATION DIAGRAM
• GPS
Patents pending.
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