Diodes AP3031 - Manual

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
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.
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