Diodes AP3033 User Manual

Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3033

General Description

The AP3033 is an inductor-based DC/DC boost converter designed to drive LED arrays. 1.3A switching current allows AP3033 to be used in different 7' to 10' LCD panel backlights (3S8P LED arrays typically).

A constant frequency 1MHz PWM control scheme is employed in this IC, which means tiny external components can be used. Specifically, 1mm tall 10 inductor and 10 application is sufficient.

The over output voltage protection is equipped in AP3033, which protects the IC under open load condition. The AP3033 includes UVLO, soft-start, standby mode, current limit and OTSD to protect the circuit.

The AP3033 is available in standard TSOT-23-6 package.

µF output capacitor for the typical

µH

Features

· Up to 92% Efficiency

(V

· Up to 88% Efficiency

(V

· Fast 1MHz Switching Frequency

· Wide Input Voltage Range: 3V to 16V

· Low 200mV Feedback Voltage

· Output Over Voltage Protection

· Cycle by Cycle Current Limit: 1.3A

· High Frequency PWM Dimming

· Built-in Soft-start

· Built-in Thermal Shutdown Function

· Under Voltage Lockout

=9V, I

IN

=5V, I

IN

OUT

=160mA)

Applications

· 7' to 10' LCD Panels

· Digital Photo Frame

· GPS Receiver

· Netbook

· PDVD

TSOT-23-6

Figure 1. Package Type of AP3033

Jan. 2010 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3033

Pin Configuration

KT Package

(TSOT-23-6)

Pin 1 Dot by Marking

V

SW

GND

1

2

6

IN

OV

5

FB

34

CTRL

Figure 2. Pin Configuration of AP3033 (Top View)

Pin Description

Pin Number Pin Name Function

1 SW Switch Pin. Connect external inductor and Schottky

2 GND Ground Pin

3 FB Voltage Feedback Pin. 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. If logic low time is more than about 0.45ms and then enable the IC, the

4

5 OV Over-voltage Protection Input Pin. Connect to the output directly or connect to the V

CTRL

AP3033 will soft start to protect system departments. If logic low time is less than about

0.45ms and then enable the IC, the AP3033 will hold on standby mode and start directly to achieve high frequency dimming

through a resistor divider to set the OVP voltage. On OVP condition, the output voltage will be clamped

OUT

6V

Input Supply Pin. Must be locally bypassed

IN

Jan. 2010 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3033

Functional Block Diagram

CTRL

FB

3

FB REF

R

C

200mV REF

4

STANDBY

V

REF

1.25V

V

6

IN

SOFT

START

OVP

A

1

A2

COMPARATOR

CONTROL

LOGIC

OVER

TEMPERATURE

DETECTOR

DRIVER

Σ

RAMP

GENERATOR

1MHz

OSCILLATOR

SW

1

5

OV

Q1

2

GND

Figure 3. Functional Block Diagram of AP3033

Ordering Information

AP3033 -

Circuit Type

Package

KT: TSOT-23-6

Package Temperature Range Part Number Marking ID Packing Type

TSOT-23-6

-40 to 85oC

AP3033KTTR-G1

BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green.

Jan. 2010 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

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G1: Green

TR: Tape and Reel

L8G

Tape & Reel

Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3033

Absolute Maximum Ratings (Note 1)

Parameter Symbol Value Unit

Input Voltage V

SW Voltage V

FB Voltage V

OV Voltage V

CTRL Voltage V

Thermal Resistance

IN

SW

FB

OV

CTRL

θ

JA

20 V

38 V

20 V

265

o

C/W

(Junction to Ambient, No Heat Sink)

Operating Junction Temperature T

Storage Temperature Range T

Lead Temperature (Soldering, 10sec) T

LEAD

J

STG

150

-65 to 150

260

o

C

o

C

o

C

ESD (Machine Model) 600 V

ESD (Human Body Model) 4000 V

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 V

CTRL Voltage V

IN

CTRL

3 16

16 V

Jan. 2010 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

4

o

C

V