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

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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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Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3036/A

Typical Performance Characteristics

The WLED forward voltage (VF) is 3.45V at IF=20mA, unless otherwise noted.

90

88

86

84

82

80

78

Efficiency (%)

76

74

72

2345678

Figure 4. Efficiency vs. LED’s Number Figure 5. Schottky Forward Voltage vs.

100

90

80

70

60

50

Shutdown Current (µA)

40

30

0 2 4 6 8 101214161820

Figure 6. Shutdown Current vs. Input Voltage Figure 7. Quiescent Current vs. Input Voltage

LED Numbers

Input Voltage (V)

VIN=3.6V

=20mA

I

OUT

V

CRTL

=0V

1600

1200

800

400

Schottky Forward Voltage (mV)

0

0 100 200 300 400 500

Schottky Forward Current (mA)

Schottky Forward Current

3.8

3.6

3.4

3.2

Quiescent Current (mA)

3.0

2.8
048121620

VFB=1.0V

Input Voltage (V)

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Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3036/A

Typical Performance Characteristics (Continued)

The WLED forward voltage (V

) is 3.45V at IF=20mA, unless otherwise noted.

F

300

250

200

150

Feedback Voltage (mV)

100

-40 0 40 80 120 160

Temperature (OC)

VIN=3.6V, 5 LEDs

AP3036
AP3036A

600

500

400

Current Limit (mA)

300

-40 0 40 80 120 160

Figure 8. Feedback Voltage vs. Temperature Figure 9. Current Limit vs. Temperature

VIN=3.6V

Temperature (OC)

800

700

600

500

400

300

200

Saturation Voltage (mV)

100

0

0 100 200 300 400 500

Switch Current (mA)

VIN=V

CRTL

=3.6V

1.2

0.8

CTRL Voltage (V)

0.4

0.0

-40 0 40 80 120 160

Figure 10. Saturation Voltage vs. Switch Current Figure 11. CTRL Pin Voltage vs. Temperature

Temperature (OC)

VIN=3.6V, 5 LEDs

Rising
Down

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Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3036/A

Typical Performance Characteristics (Continued)

The WLED forward voltage (V

) is 3.45V at IF=20mA, unless otherwise noted.

F

36

32

VIN=V

CRTL

=3.6V

1.2

VIN=3.6V
5 LEDs

28

24

OVP Voltage (V)

20

-40 0 40 80 120 160

Temperature (OC)

1.0

0.8

Operating Frequency (MHz)

0.6

-40 0 40 80 120 160

Temperature (OC)

Figure 12. OVP Voltage vs. Temperature Figure 13. Operating Frequency vs. Temperature

90

85

80

75

70

Efficiency (%)

65

60

2468101214161820

Input Voltage (V)

I

=20mA

LED

8 LEDs

88

84

80

76

72

Efficiency (%)

68

64

60

20 30 40 50 60 70

VIN=3.6V
5 LEDs

Output Current (mA)

Figure 14. Efficiency vs. Input Voltage Figure 15. Efficiency vs. Output Current

Jul. 2012 Rev. 1.3. BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3036/A

Typical Performance Characteristics (Continued)

The WLED forward voltage (V

) is 3.45V at IF=20mA, unless otherwise noted.

F

30

25

20

15

10

LED Current (mA)

5

0

0 20406080100

Figure 16. LED Current vs. Duty Figure 17. LED Current vs. Duty

VIN
VSW

V

OUT

IL

VIN=3.6V, 5 LEDs
PWM Frequency=0.5kHz

Duty (%)

30

25

20

15

10

LED Current (mA)

5

0

0 20406080100

V

CTRL

VSW

V

OUT

I

LED

VIN=3.6V, 5 LEDs
PWM Frequency=100KHz

Duty (%)

Time 40µs/div Time 10ms/div

Figure 18. Powering On Figure 19. PWM Dimming

(VIN=3.6V, V

CTRL

=2.5V, I

=20mA, 5 LEDs) (VIN=3.6V, V

LED

PWM

=2.5V, f

=0.5kHz, Duty=50%, 5 LEDs)

PWM

Jul. 2012 Rev. 1.3. BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3036/A

Typical Performance Characteristics (Continued)

The WLED forward voltage (V

) is 3.45V at I

F

=20mA, unless otherwise noted.

F

V

VSW

OUT

I

LED

VIN

VIN

VSW

V

(AC)

OUT1

IL

Time 1µs/div Time 10µs/div

Figure 20. Output Voltage Ripple Figure 21. PWM Dimming

(VIN=V

CTRL

=3.6V, I

=20mA, 5 LEDs) (VIN=3.6V, V

LED

PWM

=2.5V, f

=100kHz, Duty=50%, 5 LEDs)

PWM

Jul. 2012 Rev. 1.3. BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3036/A

Typical Application

Figure 22. Typical Application of AP3036/A (Note 3)

Note 3: C: X5R or X7R type dielectric, L: SUMIDA CDRH5D28R-220NC or equivalent. And, this circuit can
work in full temperature.

Jul. 2012 Rev. 1.3. BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3036/A

Mechanical Dimensions

SOT-23-6 Unit: mm(inch)

2.820(0.111)

3.020(0.119)

0.300(0.012)

0.400(0.016)

6

Pin 1 Dot by Marking

123

5

4

0.300(0.012)

0.600(0.024)

0.700(0.028)REF

0°
8°

0.200(0.008)

0.950(0.037)TYP

1.800(0.071)

2.000(0.079)

0.000(0.000)

0.150(0.006)

0.900(0.035)

1.300(0.051)

1.450(0.057)
MAX

0.100(0.004)

0.200(0.008)

Jul. 2012 Rev. 1.3. BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3036/A

Mechanical Dimensions (Continued)

TSOT-23-6 Unit: mm(inch)

°

2.800(0.110)

3.000(0.118)

R0.100(0.004)

MIN

0
8

°

1.500(0.059)

1.700(0.067)

0.950(0.037)
BSC

0.000(0.000)

0.100(0.004)

0.700(0.028)

0.900(0.035)

Pin 1 Dot by

Marking

1.900(0.075)
BSC

0.350(0.014)

0.510(0.020)

2.600(0.102)

3.000(0.118)

1.000(0.039)
MAX

GAUGE

PLANE

0.370(0.015)
MIN

0.100(0.004)

0.250(0.010)

0.250(0.010)
BSC

Jul. 2012 Rev. 1.3. BCD Semiconductor Manufacturing Limited

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BCD Semiconductor Manufacturing Limited

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