Diodes AP3032 - Manual

Data Sheet
WHITE LED STEP-UP CONVERTER AP3032
Dec. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
1
General Description
The AP3032 is an inductor-based DC/DC boost
converter designed to drive up to 4 rows of LEDs
with 7 series for each in parallel for backlight.
A constant frequency 1MHz PWM control scheme is
employed in this IC, which means tiny external
components can be used. Specifically, 1mm tall
6.8
μH inductor and 1µF aluminum output capacitor
for the typical application is sufficient.
The over output voltage protection is equipped in
AP3032, which protects the IC under open load
condition. The AP3032 includes UVLO, soft-start,
stand-by mode, current limiting and OTSD to protect
the circuit under over load condition
The AP3032 is available in SOT-23-6 package.
Features
•
Efficiency Up to 81%（V
IN
=5V, I
OUT
=80mA）
• Drives up to 4 Rows of WLEDs with 7 Series
for Each in Parallel (V
IN
=5V)
• Fast 1 MHz Switching Frequency
• Wide Input Voltage Range: 2.7V to 9V
• Low Feedback Voltage: 200mV
• Output Over Voltage Protection
• Cycle-by-cycle Current Limit: 1.4A
• Built in Soft-start
• Built in Standby-mode to Achieve High
• Frequency PWM Dimming
• Built in Thermal Shutdown Function
• Under Voltage Lockout
Applications
• 7’ to 10’ LCD Panels
• Digital Photo Frame
• GPS Receiver
Figure 1. Package Type of AP3032
SOT-23-6