MP3391—8-CHANNEL, 120mA/CH STEP-UP WLED DRIVER CONTROLLER

MP3391 Rev. 1.11

www.MonolithicPower.com

7

3/14/2013

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Pin #

Name

Description

16

LED4

LED String 4 Current Input. This pin is the open-drain output of an internal dimming

control switch. Connect the LED String 4 cathode to this pin.

17

LED5

LED String 5 Current Input. This pin is the open-drain output of an internal dimming

control switch. Connect the LED String 5 cathode to this pin.

18

LED6

LED String 6 Current Input. This pin is the open-drain output of an internal dimming

control switch. Connect the LED String 6 cathode to this pin.

19

LED7

LED String 7 Current Input. This pin is the open-drain output of an internal dimming

control switch. Connect the LED String 7 cathode to this pin.

20

LED8

LED String 8 Current Input. This pin is the open-drain output of an internal dimming

control switch. Connect the LED String 8 cathode to this pin.

21

NUMSEL

Number of LED String Selection. Set this pin high enables the 6 strings (LED1~LED6)

operation. Pull this pin low enables the 4 strings (LED1~LED4) operation. Float this pin

enables the 8 strings operation.

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 1.24V, the MP3391 triggers

Over Voltage Protection mode.

23

PGND

Step-up Converter Power Ground.

24

ISENSE

Current Sense Input. During normal operation, this pin senses the voltage across the

external inductor current sensing resistor for peak current mode control and also to limit

the inductor current during every switching cycle.

25

GATE

Step-up Converter Power Switch Gate Output. This pin drives the external power N-MOS

device.

26

FF

Fault Flag. It is the drain of internal N-channel MOSFET. When open/short protection is

triggered, the FF pin is pulled to GND.

27

VFAULT

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

turns on the external PMOS. When the Vout is shorted to GND or MP3391 is disabled,

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

28

NC

No Connection