MP3388- 50V, 8-STRING WHITE LED DRIVERS

MP3388 Rev. 1.0

www.MonolithicPower.com

6

12/16/2011

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© 2011 MPS. All Rights Reserved.

QFN24

SOIC28

Name

Description

15

21

LED1

LED String 1 Current Input. This pin is the open-drain output of an internal

dimming control switch. Connect the LED String 1 cathode to this pin. If this

string is not used, connect Vout to this pin.

16

22

OVP

Over-voltage Protection Input. Connect a resistor divider from output to this

pin to program the OVP threshold. When this pin voltage reaches 1.23V, the

MP3388 triggers OV Protection mode.

17

23

PGND2

Step-up Converter Power Ground.

18

24

PGND1

Step-up Converter Power Ground. PGND1 and PGND2 should be shorted

externally.

19

28

SW2

Step-up Converter Power Switch Output. SW2 is the drain of the internal

MOSFET switch. Connect the power inductor and output rectifier to SW2.

SW2 can swing between GND and 50V. SW1 and SW2 should be shorted

externally.

20

26

SW1

Step-up Converter Power Switch Output. SW1 is the drain of the internal

MOSFET switch. Connect the power inductor and output rectifier to SW1.

SW1 can swing between GND and 50V. SW1 and SW2 should be shorted

externally.

21

1

VFAULT

Fault Disconnection Switch Driver Output. When the system starts up

normally, this pin turns on the external PMOS. When the MP3388 is disabled,

the external PMOS is turned off to disconnect the input and output.

22

2

COMP

Step-up Converter Compensation Pin. This pin is used to compensate the

regulation control loop. Connect a capacitor or a series RC network from

COMP to GND.

23

3

VIN

Supply Input. VIN supplies the power to the MP3388 chip. Drive VIN with a

4.5V to 25V power source. Must be locally bypassed.

24

4

VCC

The Internal 5V Linear Regulator Output. VCC provides power supply for the

internal MOSFET switch gate driver and the internal control circuitry. Bypass

VCC to GND with a ceramic capacitor. If VIN is less than 5.5V, apply an

external 5V supply directly on VCC.

15, 17,

25, 27

NC

No connect