Diodes AP3036B User Manual

AP3036B

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AP3036B

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Description

The AP3036B 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 AP3036B also provides a
disable pin to ease its use for different systems.

The output over-voltage protection is implemented in AP3036B. When
any LED is broken or in other abnormal conditions, the output voltage
will be clamped.

The AP3036B is available in standard SOT26 package.

Applications

 Cellular Phones
 Digital Cameras
 LCD Modules
 GPS Receivers
 PDAs, Handheld Computers

Pin Assignments

(Top View)

SW

GND

FBCTRL

VOUT

VIN

1

2

3 4

5

Pin 1 Mark

6

SOT26

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 Capacitor
 High Frequency Dimming Control
 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
 Halogen and Antimony Free. “Green” Device (Note 3)

22

1F

0.22F

10

VIN

SW VOUT

FB

GND

CTRL

AP3036B

Control

Signal

L

C

IN

C

OUT

V

IN

3V

WHITE LED STEP-UP CONVERTER

Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.

Typical Applications Circuit (Note 4)

Note 4: C: X5R or X7R type dielectric, L: SUMIDA CDRH5D28R-220NC or equivalent. And, this circuit can work in full temperature.

AP3036B

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A Product Line of

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Pin Number

Pin Name

Function

1

CTRL

Shutdown and dimming pin. Connect to 1.5V or higher to enable device; Connect to 0.4V or less to
disable device; Connect to a PWM signal to achieve LEDs brightness dimming

2

VOUT

Output pin. Connect to the cathode of internal Schottky diode

3

VIN

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

4

SW

Switch pin. Connect external inductor

5

GND

Ground 6 FB

Voltage feedback pin. The reference voltage is 200mV

Q1



A2

A1

R

S

Q

1.0MHz

OSCILLATOR

RAMP

GENERATOR

V

REF

6

3

1

5

2

DRIVER

1.25V

COMPARATOR

OVP

200 mV

4

SOFT

START

FB SW

VOUT

GND

CTRL

VIN

Pin Descriptions

Functional Block Diagram

AP3036B

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Symbol

Parameter

Rating

Unit

VIN

Input Voltage

20

V

VSW

SW Pin Voltage

38

V

VFB

Feedback Voltage

20

V

V

CTRL

CTRL Pin Voltage

20

V

θ

JA

Thermal Resistance (Junction to Ambient, No Heat Sink)

265

C/W

TJ

Operating Junction Temperature

+150

C

T

STG

Storage Temperature Range

-65 to +150

C

T

LEAD

Lead Temperature (Soldering, 10sec)

+260

C

–

ESD (Machine Model)

250

V

–

ESD (Human Body Model)

2000

V

Symbol

Parameter

Min

Max

Unit

TOP

Operating Temperature Range

-40

+85

C

VIN

Input Voltage

2.5

16

V

V

CTRL

CTRL Pin Voltage

–

16

V

Absolute Maximum Ratings (Note 5)

Note 5: 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

AP3036B

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Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIN (Min)

Minimum Operating Voltage

–

2.5 – –

V

VIN (Max)

Maximum Operating Voltage

–

– – 16

VFB

Feedback Voltage

I

OUT

= 20mA, 4 LEDs

188

200

212

mV

IFB

FB Pin Bias Current

– – 35

100

nA

IQ

Quiescent Current

V

FB

= VIN, No Switching

1.6

3.1

3.9

mA

I

SHDN

Shutdown Quiescent Current

V

CTRL

= 0V

–

45

75

µA

f

Switching Frequency

– – 1.0 – MHz

D

MAX

Maximum Duty Cycle

–

90

93 – %

I

LIMIT

Switch Current Limit (Note 6)

D = 40% or 80%

–

550 – mA

V

CESAT

Switch VCE Saturation Voltage

I

SW

= 250mA

–

360 – mV

–

Switch Leakage Current

V

SW

= 5V

–

0.01 5 µA

V

CTRL

CTRL Pin Voltage
High

1.5

–

–

V

Low

– – 0.4

I

CTRL

CTRL Pin Bias Current

– – 100 – µA

VOV

OVP Voltage

– – 30 – V

V

DROP

Schottky Forward Drop

ID = 150mA

–

0.7 – V

–

Schottky Leakage Current
VR (Reverse Voltage) = 23V

–

0.1

4

µA

VR (Reverse Voltage) = 27V

– – 150

t

Soft Start Time

–

–

100 – µs

θ

JC

Thermal Resistance
(Junction to Case)

SOT26 – 60

–

C/W

Electrical Characteristics (@V

= 3V, V

IN

CTRL

= 3V, T

= +25°C, unless otherwise specified.)

A

Note 6: The switch current limit is related to duty cycle. Please refer to Figure LED Current vs. Duty (PWM Frequency = 0.5kHz).

AP3036B

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2 3 4 5 6 7 8

72

74

76

78

80

82

84

86

88

90

Efficiency (%)

LED Numbers

VIN=3.6V
I

OUT

=20mA

0 100 200 300 400 500

0

400

800

1200

1600

Schottky Forward Voltage (mV)

Schottky Forward Current (mA)

0 2 4 6 8 10 12 14 16 18 20

30

40

50

60

70

80

90

100

Shutdown Current (

A)

Input Voltage (V)

V

CTRL

=0V

0 4 8 12 16 20

2.8

3.0

3.2

3.4

3.6

3.8

Quiescent Current (mA)

Input Voltage (V)

VFB=1.0V

-40 0 40 80 120 160

100

150

200

250

300

Feedback Voltage (mV)

Temperature (OC)

VIN=3.6V, 5 LEDs

-40 0 40 80 120 160

300

400

500

600

Current Limit (mA)

Temperature (OC)

VIN=3.6V

Performance Characteristics (The WLED forward voltage (V

Efficiency vs. LED’s Number Schottky Forward Voltage vs.

Shutdown Current vs. Input Voltage Quiescent Current vs. Input Voltage

Feedback Voltage vs. Temperature Current Limit vs. Temperature

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

F

Schottky Forward Current

AP3036B

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0 100 200 300 400 500

0

100

200

300

400

500

600

700

800

Saturation Voltage (mV)

Switch Current (mA)

VIN=V

CTRL

=3.6V

-40 0 40 80 120 160

0.0

0.4

0.8

1.2

CTRL Voltage (V)

Temperature (OC)

VIN=3.6V, 5 LEDs

Rising
Down

-40 0 40 80 120 160

20

24

28

32

36

OVP Voltage (V)

Temperature (OC)

VIN=V

CTRL

=3.6V

-40 0 40 80 120 160

0.6

0.8

1.0

1.2

Operating Frequency (MHz)

Temperature (OC)

VIN=3.6V
5 LEDs

2 4 6 8 10 12 14 16 18 20

60

65

70

75

80

85

90

Efficiency (%)

Input Voltage (V)

I

LED

=20mA

8 LEDs

20 30 40 50 60 70

60

64

68

72

76

80

84

88

Efficiency (%)

Output Current (mA)

VIN=3.6V
5 LEDs

Performance Characteristics (Cont. The WLED forward voltage (V

Saturation Voltage vs. Switch Current CTRL Pin Voltage vs. Temperature

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

F

OVP Voltage vs. Temperature Operating Frequency vs. Temperature

Efficiency vs. Input Voltage Efficiency vs. Output Current

AP3036B

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0 20 40 60 80 100

0

5

10

15

20

25

30

LED Current (mA)

Duty (%)

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

0 20 40 60 80 100

0

5

10

15

20

25

30

LED Current (mA)

Duty (%)

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

VIN

2V/div

VSW

10V/div

V

OUT

10V/div

IL

100mA/div

V

CTRL

2V/div

VSW

10V/div

V

OUT

I

LED

10mA/div

VIN

2V/div

VSW

10V/div

V

OUT1

(AC)

100mV/div

IL

100mA/div

VIN

2V/div

VSW

10V/div

V

OUT

10V/div

I

LED

10mA/div

Performance Characteristics (Cont. The WLED forward voltage (V

LED Current vs. Duty LED Current vs. Duty

Powering On PWM Dimming

(V

= 3.6V, V

IN

CTRL

= 2.5V, I

= 20mA, 5 LEDs) (V

LED

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

F

= 3.6V, V

IN

PWM

= 2.5V, f

= 0.5kHz,

PWM

Duty = 50%, 5 LEDs)

Time 40s/div Time 10ms/div

(V

Output Voltage Ripple PWM Dimming

= V

IN

CTRL

= 3.6V, I

Time 1s/div Time 10s/div

= 20mA, 5 LEDs) (V

LED

= 3.6V, V

IN

PWM

= 2.5V, f

= 100kHz,

PWM

Duty = 50%, 5 LEDs)

AP3036B

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NE W P R OD U C T

AP3036B X XX - XX

PackingPackageProduct Name

TR : Tape & Reel

K : SOT26

G1 : Green

RoHS/Green

Package

Temperature

Range

Part Number

Marking ID

Packing

SOT26

-40ºC to +85ºC

AP3036BKTR-G1

GHR

3000/7”Tape & Reel

XXX

: Logo

XXX: Marking ID (See Ordering Information)

Ordering Information

Diodes IC’s Pb-free products with "G1" suffix in the part number, are RoHS compliant and green.

Marking Information

(Top View)

AP3036B

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2.820(0.111)

3.100(0.122)

2.650(0.104)

3.000(0.118)

1.500(0.059)

1.700(0.067)

0.950(0.037)TYP

1.800(0.071)

2.000(0.079)

0.300(0.012)

0.500(0.020)

0.700(0.028)REF

0.100(0.004)

0.200(0.008)

0°
8°

0.200(0.008)

0.300(0.012)

0.600(0.024)

0.000(0.000)

0.150(0.006)

0.900(0.035)

1.300(0.051)

1.450(0.057)
MAX

1 2 3

4

5

6

Pin 1 Mark

Package Outline Dimensions (All dimensions in mm(inch).)

(1) Package Type: SOT26

AP3036B

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E E

G

Z

Y

X

Dimensions

Z

(mm)/(inch)

G

(mm)/(inch)

X

(mm)/(inch)

Y

(mm)/(inch)

E

(mm)/(inch)

Value

3.600/0.142

1.600/0.063

0.700/0.028

1.000/0.039

0.950/0.037

Suggested Pad Layout

(1) Package Type: SOT26

AP3036B

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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).

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