MP3393—8-STRING WHITE LED DRIVER WITH STEP-UP CONTROLLER

MP3393 Rev. 1.05

www.MonolithicPower.com

7

3/26/2013

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Pin #

Name

Description

17

CTL6

External Transistor Control Pin. Connect it to the base of an external transistor to

regulate the channel 6 current.

18

FB6

LED Current Feedback. Detects the channel 6 current.

19

CTL7

External Transistor Control Pin. Connect it to the base of an external transistor to

regulate the channel 7 current.

20

FB7

LED Current Feedback. Detects the channel 7 current.

21

CTL8

External Transistor Control Pin. Connect it to the base of an external transistor to

regulate the channel 8 current.

22

FB8

LED Current Feedback. Detects the channel 8 current.

23

FF

Fault Flag Output. Open drain of internal N-MOSFET. Pulled up to external DC level in

normal mode. Internal MOSFET turns on and the FF is pulled to GND when open/short

protection triggers.

24

OVP

Over-Voltage Protection Input. Connect a resistor divider from the output to this pin to

program the OVP threshold. When this pin voltage reaches 1.23V, the MP3393 triggers

OVP mode.

25

GND

Step-Up Converter Power Ground.

26

ISENSE

Current Sense. Senses the voltage across the external inductor-current sensing resistor

for peak current mode control and to limit inductor current during each switching cycle. If

this pin is not used for daisy-chaining with another MP3393, tie this pin to GND: do not

leave it floating.

27

GATE

Step-up Converter Power Switch Gate Output. Drives the external power NMOS.

28

VFAULT

Fault Disconnection Switch Gate Output. Turns on the external PMOS during normal

operation. When the MP3393 is disabled, the external PMOS turns off to disconnect the

input and output.