Diodes AP3036-A User Manual

WHITE LED STEP-UP CONVERTER AP3036/A

Preliminary Datasheet

General Description

The AP3036/A is an inductor-based DC/DC
converter designed to drive up to eight white LEDs in
series for backlight. Only one feedback resistor is
needed to control the LED current and obtain
required brightness.

A constant frequency 1.0MHz PWM control scheme
is employed in this IC, which means tiny external
components can be used. Specifically, 1mm tall
inductor and 0.22µF output capacitor for a typical
application is sufficient. Additionally, the Schottky
diode in boost circuit is integrated on this chip. The
AP3036/A also provides a disable pin to ease its use
for different systems.

The output over-voltage protection is implemented in
AP3036/A. When any LED is broken or in other
abnormal conditions, the output voltage will be
clamped.

The AP3036/A is available in standard SOT-23-6 and
TSOT-23-6 packages.

Features

Inherently Uniform LED Current

•

• High Efficiency up to 84%

• No Need for External Schottky Diode

• Output Over-voltage Protection (OVP)

• Fixed 1.0MHz Switching Frequency

• Uses Tiny 1mm Tall Inductor

• Requires Only 0.22µF Output Capaci t or

• High Frequency Dimming Control

Applications

• Cellular Phones

• Digital Cameras

• LCD Modules

• GPS Receivers

• PDAs, Handheld Computers

SOT-23-6 TSOT-23-6

Figure 1. Package Types of AP3036/A

Jul. 2012 Rev. 1.3. BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3036/A

Pin Configuration

K/KT Package
(SOT-23-6/TSOT-23-6)

GND

Figure 2. Pin Configuration of AP3036/A (Top View)

Pin 1 Dot by Marking

SW

FB

1

2

34

VIN

6

5

VOUT

CTRL

Pin Description

Pin Number Pin Name Function

1 SW

2 GND

3 FB

4 CTRL

5 VOUT

6 VIN

Switch pin. Connect external inductor

Ground
Voltage feedback pin. The reference voltage is 200mV for AP3036

and 250mV for AP3036A
Shutdown and dimming pin. Connect to 1.8V or higher to enable

device; Connect to 0.4V or less to disable device; Connect to a PWM
signal to achieve LEDs brightness dimming

Output pin. Connect to the cathode of internal Schottky diode

Input supply pin. Must be connected to a local bypass capacitor

Jul. 2012 Rev. 1.3. BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3036/A

Functional Block Diagram

Figure 3. Functional Block Diagram of AP3036/A

Ordering Information

AP3036 -

Circuit Type

Blank: AP3036
A: AP3036A TR: Tape & Reel

Package
K: SOT-23-6
KT: TSOT-23-6

Package

SOT-23-6

TSOT-23-6

Temperature

Range

-40 to 85°C

Part Number Marking ID Packing Type

AP3036KTR-G1 GHI Tape & Reel
AP3036AKTR-G1 GJE Tape & Reel
AP3036KTTR-G1 L2C Tape & Reel
AP3036AKTTR-G1 L3C Tape & Reel

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

Jul. 2012 Rev. 1.3. BCD Semiconductor Manufacturing Limited

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G1: Green

Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3036/A

Absolute Maximum Ratings (Note 1)

Parameter Symbol Value Unit

Input Voltage VIN 20 V
SW Pin Voltage VSW 38 V
Feedback Voltage VFB 20 V
CTRL Pin Voltage V

Thermal Resistance (Junction to
Ambient, No Heat Sink)

Operating Junction Temperature TJ 150
Storage Temperature Range T
Lead T em perature (Soldering, 10sec) T
ESD (Machine Model) 250 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 Maximu m 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 T em perature Range TOP -40 85
Input Voltage VIN 2.5 16 V
CTRL Pin Voltage V

16 V

CTRL

°C

Jul. 2012 Rev. 1.3. BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3036/A

Electrical Characteristics

V

=3V, V

IN

Parameter Symbol Conditions Min Typ Max Unit

Minimum Operating Voltage VIN (Min) 2.5

Maximum Operating Voltage VIN (Max) 16

=3V, TA=25°C, unless otherwise specified.

CTRL

V

Feedback Voltage VFB

AP3036

AP3036A 235 250 265

I

=20mA, 4 LEDs

OUT

188 200 212

mV

FB Pin Bias Current IFB 35 100 nA

Quiescent Current IQ

Shutdown Quiescent Current I

SHDN

V

VFB=VIN, No
Switching

=0V 45 75

CTRL

1.6 3.1 3.9 mA

µA

Switching Frequency f 1.0 MHz

Maximum Duty Cycle D

Switch Current Limit (Note 2) I

Switch VCE Saturation Voltage V

Switch Leakage Current VSW=5V 0.01 5

90 93 %

MAX

D=40% or 80% 550 mA

LIMIT

I

CESAT

=250mA 360 mV

SW

µA

High 1.8

CTRL Pin Voltage V

CTRL

V

Low 0.4

CTRL Pin Bias Current I

CTRL

100

µA

OVP Voltage VOV 30 V

Schottky Forward Drop V

Schottky Leakage Current

Soft Start Time t 100

Thermal Resistance
(Junction to Case)

I

DROP

θ

JC

=150mA 0.7 V

D

(Reverse

V

R

Voltage)=23V
VR(Reverse

Voltage)=27V

0.1 4
µA

150

µs

SOT-23-6 60

°C/W

TSOT-23-6 60

Note 2: The switch current limit is related to duty cycle. Please refer to Figure 16 for detail.

Jul. 2012 Rev. 1.3. BCD Semiconductor Manufacturing Limited

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