Diodes AP3615 User Manual

5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER AP3615

Data Sheet

General Description

The AP3615 is a step-up DC-DC converter based on 1x/1.5x charge pump and low dropout current sink, which helps it maintain the highest efficiency. The AP3615 is specially designed to drive up to 5 WLEDs in backlight display.

The AP3615 provides up to 20mA current for each WLED. There are totally 16 steps of current control, which is achieved through a digital pulse dimming function on EN pin. Additionally, 1MHz high switching frequency enables the use of small external capacitors. Internal soft-start circuitry prevents excessive inrush current during start-up and mode transition.

The supply voltage of AP3615 ranges from 2.8V to

5.5V which make it ideally suit for applications powered by Li-ion battery.

The AP3615 is available in the tiny package of

QFN-3×3-16.

Features

• Regulated Output Current with ±3% Matching

• Drives up to 5 WLEDs at 20mA Each

• 16 Steps Brightness Control Using Pulse Signal Dimming

• Wide Operating Voltage Range: 2.8V to 5.5V

• High Operating Frequency: 1MHz

• Auto 1x/1.5x Charge Pump Mode Selection

• Built-in Soft-start

• Output Over Voltage Protection

• Built-in UVLO

• Built-in OTSD

• Operating Temperature Range: -40°C to 85°C

Applications

• Mobile Phone

• PDA

• MP3/4

QFN-3×3-16

Figure 1. Package Type of AP 3615

Jan. 2013 Rev. 1. 3 BCD Semiconductor Manufacturing Limited

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Data Sheet

5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER AP3615

Pin Configuration

FN Package

(QFN-3×3-16)

Note: Pin 14 should be connected with Pin 16 on PCB Board.

Pin 1 Mark

C1-

-

C

2 C2+ C1+

Figure 2. Pin Configuration of AP3615 (Top View)

VOUT1

1

2

3

49

5678

AGND

NC

EP

PGND

VOUT2

D1

13141516

EN

VIN

12

D2

11

D3

10

D4 D5

Exposed PAD, Connected to AGND

Pin Description

Pin Number Pin Name Function

1 C1-

2 C2-

3 C2+

4 C1+

5 AGND Analog ground

6 PGND Power ground

7 VIN Supply voltage input

8 EN

9, 10, 11, 12,

13

14 VOUT2 Output pin 2. It powers 5 channels current sink

15 NC No connection

16 VOUT1

D5 ~ D1

Flying capacitor 1 negative terminal. The flying capacitor should be connected as close to this pin as possible

Flying capacitor 2 negative terminal. The flying capacitor should be connected as close to this pin as possible

Flying capacitor 2 positive terminal. The flying capacitor should be connected as close to this pin as possible

Flying capacitor 1 positive terminal. The flying capacitor should be connected as close to this pin as possible

Enable control input. Logic high enables the IC; while logic low forces the IC into shutdown mode. It is used for digital dimming by applying a pulse signal on it.

Current sink for WLED5, 4, 3, 2, 1. Connect the cathode of WLEDs to these pins. If not used, these pins must be connected with VIN

Output Pin 1. It’s the charge pump output. The output capacitor should be placed closely to this pin

Jan. 2013 Rev. 1. 3 BCD Semiconductor Manufacturing Limited

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Data Sheet

5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER AP3615

Functional Block Diagram

C1- C1+ C2- C2+

14 32

VIN

EN

7

8

1x /1.5x Charge Pump

1MHz

OSC

Shutdown

Delay

16 Steps Pulse

Dimming Controller

Figure 3. Functional Block Diagram of AP3615

Current Limitation

Soft Start

UVLO

5 Channels Current Sink

OTSD

2D1 D3 D4

D

OVP

10111213

D5

16

9

14

5

6

VOUT1 AGND

PGND

VOUT2

Ordering Information

AP3615 -

Circuit Type G1: Green

Package

FN: QFN-3×3-16

TR: Tape and Reel

Package

QFN-3×3-16

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

Temperature

Range

-40 to 85°C

Part Number Marking ID

AP3615FNTR-G1 B2B Tape & Reel

Packing

Type

Jan. 2013 Rev. 1. 3 BCD Semiconductor Manufacturing Limited

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Data Sheet

5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER AP3615

Absolute Maximum Ratings (Note 1)

Parameter Symbol Value Unit

Input Voltage VIN -0.3 to 6 V

VOUT Pin Voltage (VOUT1 & VOUT2) V

EN Pin Voltage VEN -0.3 to 6 V

C1+, C2+ Pin Voltage VC+ -0.3 to 6 V

C1-, C2- Pin Voltage VC- -6 to 0.3 V

D1, D2, D3, D4 and D5 Pin Voltage VD V

Thermal Resistance (Junction to Ambient, No Heat Sink, Free Air) Operating Junction Temperature

Storage Temperature

Lead Temperature (Soldering, 10sec)

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.

-6 to 0.3 V

OUT

to VIN V

OUT

60 ºC/W

150 ºC

-65 to 150 ºC

260 ºC

T

θ

JA

TJ

STG

LEAD

Recommended Operating Conditions

Parameter Symbol Min Max Unit

Input Voltage VIN 2.8 5.5 V

Operating Ambient Temperature TA -40 85 ºC

Jan. 2013 Rev. 1. 3 BCD Semiconductor Manufacturing Limited

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