MP3387L ― STEP UP, 6STRINGS,WHITE LED DRIVER

MP3387L Rev. 1.11

www.MonolithicPower.com

7

3/29/2016

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PIN FUNCTIONS

Package

Pin #

Name

Description

1

EN

Enable Control Input. Internally weakly pulled to low.

2

FREQ

Switching Frequency Setting Pin. Connect a resistor between this pin and GND to set the

converter’s switching frequency.

3

NC

No Connect Pin. Leave this pin float.

4

MIX

Dimming Mode Select Pin. Pulled to high to select combined analog and PWM dimming

mode with 25% transfer point. Pulled to low to select direct PWM dimming mode. In default,

this pin is pulled to high.

5

AGND Analog Ground.

6

PWMI

PWM Signal Input. Apply a PWM signal on this pin for brightness control. Dimming signal

with100Hz to 20kHz is recommended. Internally weakly pulled to low.

7

NC

No Connect Pin. Leave this pin float.

8

NC

No Connect Pin. Leave this pin float.

9

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.

10

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.

11

ISET

LED Current Setting. Tie a current setting resistor from this pin to ground to program the

current in each LED string.

12

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.

13

LED3

LED String 3 Current Input. This pin is the open-drain output of an internal dimming control

switch. Connect the LED String 3 cathode to this pin.

14

LED2

LED String 2 Current Input. This pin is the open-drain output of an internal dimming control

switch. Connect the LED String 2 cathode to this pin.

15

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.

16

OVP

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

the OVP threshold.

17

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

18

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

19

LX2

Step-up Converter Power Switch Output. LX2 is the drain of the internal MOSFET switch.

Connect the power inductor and output rectifier to LX2. LX2 and LX1 should be shorted

externally.

20

LX1

Step-up Converter Power Switch Output. LX1 is the drain of the internal MOSFET switch.

Connect the power inductor and output rectifier to LX1. LX1 and LX2 should be shorted

externally.

21

NC

No Connect Pin. Leave this pin float.

22

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

VIN

Power Supply Input. VIN supplies the power to the IC. Drive VIN with a 3V to 26V power

source. Must be locally bypassed.

24

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, tie VIN and VCC together.