[AP2071AEN]

MS1607-E-00

- 8 -

2014/03

9. Functional Descriptions

The AP2071AEN integrates a boost DC-DC converter which integrates a switching FET and a synchronous

rectifier, supporting small size multilayer inductor with 2MHz switching frequency. The AP2071AEN has

four current sources to control the LED current which connected to LED1, LED2, LED3, LED4 pins. The

AP2071AEN supports five operation modes (Charge, Flash, Torch, Bypass torch and Discharge).

Mode

Function

Register Setting

Explanation

Mode 1

Charger

Mode

CHAR bit= “1”

FLASH bit= “0”

TORCH bit= “0”

DISCH[1:0]= “00”

Charge EDLC.

Mode 2

Flash

Mode

FLASH bit= “1”

TORCH bit= “0”

DISCH[1:0]= “00”

Drive LED with flashing setting current.

Mode 3

Torch

Mode

CHAR bit= “1”

FLASH bit= “0”

TORCH bit= “1”

DISCH[1:0]= “00”

Drive LED with torching setting current and

the DC-DC boost circuit operating.

Mode 4

Bypass Torch

Mode

CHAR bit= “1”

FLASH bit= “0”

TORCH bit= “1”

DISCH[1:0]= “00”

VSET[2:0]= “000”

Drive LED with torching setting current and

the DC-DC boost circuit not operating.

Mode 5

Discharger

Mode

DISCH[1:0]= “01” or “10”

Discharge EDLC until the setting voltage

through 68 which connected to GND.