Diodes AP3032 User Manual
WHITE LED STEP-UP CONVERTER AP3032
Data Sheet
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
6.8μH 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%（VIN=5V, I
•
• Drives up to 4 Rows of WLEDs with 7 Series
for Each in Parallel (V
• 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
=5V)
IN
=80mA）
OUT
Applications
• 7’ to 10’ LCD Panels
• Digital Photo Frame
• GPS Receiver
Figure 1. Package Type of AP3032
Dec. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
SOT-23-6
1
Data Sheet
WHITE LED STEP-UP CONVERTER AP3032
Pin Configuration
K Package
(SOT-23-6)
Pin 1 Mark
6
SW
1
VIN
5
GND
FB
Figure 2. Pin Configuration of AP3032 (Top View)
2
34
OV
CTRL
Pin Description
Pin Number Pin Name Function
1 SW Switch pin. Connect external inductor and Schottky
2 GND Ground
3 FB Voltage feedback. Reference voltage is 200mV
Enable and dimming control pin. Connect to a high input to enable
the IC or a low input to disable the IC. Connect to a PWM input to
4 CTRL
5 OV
achieve dimming control If logic low time is less than about 0.7
ms, AP3032 is hold on standby mode, at which it shut down the
power switch but shield the soft-start function, to achieve high
frequency dimming
Over voltage protection input. Connect to the output directly. On
OVP condition, the output voltage will clamp
6 VIN Input supply pin. Must be locally bypassed
Dec. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
2
Data Sheet
WHITE LED STEP-UP CONVERTER AP3032
Functional Block Diagram
FB SW
VIN
CTRL
6
4
V
REF
1.25V
STAND BY
200mV
3
A1
SOFT
START
RAMP
GENERATOR
1.2MHz
OSCILLATOR
A2
COMPARATOR
OVP
CONTROL
LOGIC
OVER
TEMPERATURE
DETECTOR
DRIVER
1
5
OV
Q1
2
GND
Figure 3. Functional Block Diagram of AP3032
Ordering Information
AP3032 -
Circuit Type
TR: Tape & Reel
Package
K: SOT-23-6
Package
SOT-23-6
Temperature
Range
-40 to 85°C
Part Number Marking ID Packing Type
AP3032KTR-G1 GJL Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
G1: Green
Dec. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
3
Data Sheet
WHITE LED STEP-UP CONVERTER AP3032
Absolute Maximum Ratings (Note 1)
Parameter Symbol Value Unit
Input Voltage VIN 20 V
SW Pin Voltage VSW 38 V
FB Pin Voltage VFB 20 V
OV Voltage VOV 35 V
CTRL Pin Voltage V
Thermal Resistance (Junction to
Ambient, No Heat Sink)
Operating Junction Temperature TJ 150
Storage Temperature Range T
Lead Temperature (Soldering, 10sec) T
ESD (Machine Model) 200 V
ESD (Human Body Model) 2000 V
20 V
CTRL
θ
JA
-65 to 150
STG
260
LEAD
265
°C/W
°C
°C
°C
Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute
Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter Symbol Min Max Unit
Operating Temperature Range TOP -40 85
Input Voltage VIN 2.7 9 V
CTRL Pin Voltage V
9 V
CTRL
°C
Dec. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
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