［AP2152］

MS1348-E-00

3

2012/05

TOP VIEW

1 7

CH3

1 8

CH2

1 9

CH1

OVP

VIN

V DC

TM

RT

IS ET

GN D

2 0

10

1 4

8

9

5

12

PWM

11

COMP

4

3

S CLK

S DATA

LX

PGN D

1

2

6

4

SYNC

CLKO

1 5

PGO OD

L

D

VOUT

2

PWM INPUT

13

VIN

1

Figure 2.

AP2152 Pin Layout and a circuit example

PIN DESCRIPTION

Pin No.

Pin Name

Function

1

LX

Power MOSFET pin. Nch MOSFET open-drain. If 2.6A or higher current is detected on this

pin, over-current protection circuit is activated.

2

PGND

GND for power MOSFET

3

SDATA

Data output from serial interface. Nch open-drain output.

The output data will be

synchronized with the clock input on the SCLK pin..

When the data function is

unnecessary please connect to GND.

4

SCLK

Clock input for serial interface. When the clock function is unnecessary please connect to

GND.

5

PWM

PWM dimming signal input pin. Built-in 200kΩ pull down resistor. This also functions as

the enable input, and if this pin goes to a high level, the IC is changed from the stand-by

state to the enable state, the internal LDO is activated, and the boost operation begins. If

this pin goes to a low level, the internal timer starts counting, 30msec later the IC goes

into the standby state.

6

SYNC

Clock input pin for synchronous operation. Built-in 1MΩ pull-down resistor.

If the synchronous operation is unnecessary, please connect to GND.

7

CLKO

Internal clock output pin. If the clock function is unnecessary, please keep this pin open.

8

VIN

Power input pin. Internal LDO input to provide power for internal circuits. 1.0μF should

be connected between the VIN pin and GND.

9

VDC

Internal LDO output pin. 5V output by regulating from VIN. Maximum output current is

30mA. 1.0μF should be connected between the VDC pin and GND.

10

OVP

Over voltage protection detection circuit input pin. The voltage at the OVP pin is the LED

Anode voltage divided by the resistor divider. If the voltage exceeds 1.2V, the boosted LED

anode voltage will be suppressed. If the voltage goes below 0.1V, the OVP pin short

protection circuit is activated.

11

COMP

DC/DC boost converter phase compensation pin. A resistor and a capacitor should be

connected between the COMP pin and GND.

1

20

HTSSOP20

CLKO

PGOOD

11

10

CH3

CH2

CH1

TM

LX

SCLK

SDATA

GND

VDC

OVP

ISET

VIN

PGND

PWM

RT

COMP

NC

SYNC