AP3606/AP3607

Document number: DS40917 Rev. 1 - 3

1 of 16

www.diodes.com

April 2018

© Diodes Incorporated

AP3606/AP3607

4/6 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER

Description

The AP3606 and AP3607 are step-up DC-DC converters based on

1x/1.5x charge pump and low dropout current sink, which helps them

maintain the highest efficiency. The AP3606 is specially designed to

drive up to 4 WLEDs in backlight display while the AP3607 is

designed for 6 WLEDs.

These devices provide 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 ranges of AP3606 and AP3607 are from 2.7V to

5.5V which make them ideally suit for applications powered by Li-ion

battery.

These ICs are available in the tiny package of QFN-3×3-16.

Features



Regulated Output Current with ±3% Matching



Drives up to 4 WLEDs at 20mA Each (AP3606)

Drives up to 6 WLEDs at 20mA Each (AP3607)



16 Steps Brightness Control Using Pulse Signal Dimming



Wide Operating Voltage Range: 2.7V 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

Pin Assignments

(Top View)

QFN-3×3-16 (AP3606)

(Top View)

QFN-3×3-16 (AP3607)

Applications



Mobile Phone



PDA



MP3/4

E P

5

6

7

8

1

2

3

4

9

12

Pin 1 Mark

11

10

13

14

15

16

C1-

C1+

C2+

C2-

NC

D4

D3

D2

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

Exposed PAD,

Connected to AGND

E P

5

6

7

8

1

2

3

4

9

12

Pin 1 Mark

11

10

13

14

15

16

C1-

C1+

C2+

C2-

D5

D4

D3

Note: Pin 15 should be connected with Pin 16 on PCB Board.

Exposed PAD,

Connected to AGND

D6

NOT RECOMMENDED FOR NEW DESIGN

USE AP3156