Data Sheet
1
Dec. 2012 Rev. 1. 6 BCD Semiconductor Manufacturing Limited
WHITE LED STEP-UP CONVERTER AP3031
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
μH
inductor and 0.47
μF 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.
Features
· 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
· 7' to 10' LCD Panels
· Digital Photo Frame
· GPS Receiver
· EPC
· PDVD
Figure 1. Package Types of AP3031
SOT-23-6 TSOT-23-6 SOIC-8
