AP3156

HIGH EFFICIENCY 1X/1.5X/2X CHARGE PUMP

FOR WHITE LED APPLICATIONS

AP3156 Rev. 1

10 of 15

SEPTEMBER 2009

www.diodes.com

Instruction & Data Table

First

Sequence

Second

Sequence

Description

1~3

-

No Action

4~7

1~32

Reserved

8

1

2

3

4~32

Switching frequency selected to

0.5MHz

Switching frequency selected to

1MHz (default)

Switching frequency selected to

2MHz

Reserved

9

1

2

3

4~32

20mA Constant Current Mode,

32 current level supported

(default)

Low Current Mode, 4 current level

supported

25mA Constant Current Mode,

32 current level supported

Reserved

10

1~32

*

Set current level for all 6

Channels

11

1~32

*

Set current level for CH1, CH2,

CH3

12

1~32

*

Set current level for CH4, CH5,

CH6

13

1~32

*

Set current level for CH1, CH2,

CH3, CH4

14

1~32

*

Set current level for CH5, CH6

15

1~32

*

Set current level for CH1, CH2,

CH3, CH4, CH5

16

1~32

*

Set current level for CH6

17

1~32

*

Set current level for CH5

18

1~32

*

Set current level for CH4

19

1~32

*

Set current level for CH3

20

1~32

*

Set current level for CH2

21

1~32

*

Set current level for CH1

22~32

-

Reserved

33

-

Soft Reset

1) 1MHz switching frequency

2) 20mA Constant Current Mode

3) All Channels in Current Level

Setting 32 (0mA)

34

-

Null Sequence

35~63

-

Reserved

Disabled Current Sinks

Unused current channels must be disabled by connecting the

the disabled channel.

Soft-Start

Soft-start is incorporated to prevent excessive inrush current

during power-up, mode switching, and transitioning out of

stand-by mode.

Short-Circuit Protection

Short-circuit protection function is incorporated to prevent

excessive load current when either flying cap terminals or

output pin electrically tied to a very lower voltage or ground.

Over-Voltage Protection

Over-Voltage Protection function is incorporated to limit the

output voltage under a safe value to avoid on-chip device

breakdown.

Under-Voltage Lockout

Under-Voltage lockout feature disables the device when the

input voltage drops below UVLO threshold.

Thermal Auto Shutdown

When the die temperature exceeds the thermal limit, the

device will be disabled and enter stand-by mode. The

operation resumes whenever the die cools off sufficiently.

Switching frequency

By default, the AP3156 is working at 1MHz switching

frequency. It can also work at 0.5MHz or 2MHz switching

frequency which can be set through the Serial Digital Interface.

An user can choose the appropriate switching frequency with

consideration of noise immunity, input and output voltage

ripple requirement, and capacitor selection.