MP3388S—50V, 8-STRING, STEP-UP, WHITE LED DRIVER

MP3388S Rev.1.01

www.MonolithicPower.com

6

10/29/2012

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Pin #

Name

Description

16

OVP

Over-Voltage Protection Input. Connect to the tap of a resistor divider from the output to

AGND to program the OVP threshold. When this pin voltage reaches 1.23V, the MP3388S

triggers OVP mode.

17

PGND2

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

18

PGND1

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

19

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

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

VFAULT

Fault-Disconnection–Switch Driver Output. When the system starts up normally, this pin

turns on the external PMOS. When the MP3388S is disabled, the external PMOS turns off

to disconnect the input and output.

22

COMP

Step-Up Converter Compensation. This pin compensates the regulation control loop.

Connect a capacitor or a series RC network from COMP to GND.

23

VIN

Supply Input. VIN supplies the power to the MP3388S chip. Drive VIN with a 4.3V-to-25V

power source. Must be locally bypassed.

24

VCC

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

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.