Data Sheet
WHITE LED STEP-UP CONVERTER
General Description
The AP3031 is an inductor-based DC/DC boost con-
verter designed to drive LED arrays. 1.4A switching
current allows AP3031 to be used in different 7' to 10'
LCD panel backlights (3*13 LED arrays typically).
A constant frequency 1MHz PWM control scheme is
employed in this IC, which means tiny external com-
ponents can be used. Specifically, 1mm tall 4.7
µ
H
inductor and 0.47
µ
F output capacitor for the typical
application is sufficient.
The over output voltage protection is equipped in
AP3031, which protects the IC under open load condi-
tion. The AP3031 includes UVLO, soft-start, current
limit and OTSD to protect the circuit.
The AP3031 is available in standard SOT-23-6, TSOT-
23-6 and SOIC-8 packages.
AP3031
Features
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·
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Up to 92% Efficiency
(V
IN
=9V, I
OUT
=260mA)
Up to 84% Efficiency
(V
IN
=5V, I
OUT
=260mA)
Fast 1MHz Switching Frequency
Wide Input Voltage Range: 2.7V to 16V
Low 200mV Feedback Voltage
Output Over Voltage Protection
Cycle by Cycle Current Limit: 1.4A
Built-in Soft-start
Built-in Standby Mode to Achieve High Fre-
quency PWM Dimming
Built-in Thermal Shutdown Function
Under Voltage Lockout
Applications
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7' to 10' LCD Panels
Digital Photo Frame
GPS Receiver
EPC
PDVD
SOT-23-6
TSOT-23-6
SOIC-8
Figure 1. Package Types of AP3031
Apr. 2009 Rev. 1. 3
1
BCD Semiconductor Manufacturing Limited
BCDSEMI [ BCD SEMICONDUCTOR MANUFACTURING LIMITED ]
