Diodes AP5727 User Manual
Ap5727
AP5727
BIAS POWER SUPPLY FOR OLED
SUB DISPLAY AND TFT-LED
AP5727
Document number: DS31887 Rev. 2 - 2
1 of 10
www.diodes.com
January 2011
© Diodes Incorporated
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Description
The AP5727 is a high efficiency boost converter in a
compact SOT25 that provides the bias voltages for OLED
Sub Display and TFT-LCD (Liquid Crystal Display).
A high 1.2MHz switching frequency and internal
compensation minimizes external part count, PCB area and
cost. Integrated soft start reduces inrush current.
The AP5727 has a 1.25V feedback voltage making it
compatible with industry standard boost converters used to
bias LCD panels.
Pin Assignments
1
2
3
74
5
FB
SW
( Top View )
V
IN
GND
SOT25
EN
Features
•
30V High Output Voltage
•
Fast 1.2MHz Switching Frequency
•
Current limit and UVLO Protections
•
Internal Thermal Shutdown
•
Maximum 1µA Shutdown Current
•
Integrated Soft-start Function
•
SOT25: Available in “Green” Molding Compound
(No Br, Sb)
•
Lead Free Finish/RoHS Compliant (Note 1)
Applications
•
Small size TFT-LCD Bias power supply.
•
OLED bias supply for a clamshell handset sub display
•
RF amplifier bias voltages
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html.
Typical Application Circuit
V
IN
SW
EN
GND
FB
AP5727
C
OUT
10uF
R2
L1
22uH
D1
V
IN
C
IN
4.7uF
R1
V
OUT
Figure 1. Typical Application Circuit