MP3387A ― 6-STRINGS, MAX 80MA/STRING, STEP-UP, WHITE LED DRIVER

MP3387A Rev. 1.0

www.MonolithicPower.com

8

5/17/2017

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PIN FUNCTIONS

Package

Pin #

Name

Description

1

EN

Enable control input. EN is weakly pulled low internally.

2

FREQ

Switching frequency setting. Connect a resistor between FREQ and GND to set the

converter’s switching frequency.

3, 7, 8,

21

NC

No connection. Leave NC floating.

4

MIX

Dimming mode selection. Pull MIX high to select combined analog and PWM dimming

mode with a 25% transfer point. Pull MIX low to select direct PWM dimming mode. MIX is

pulled high by default.

5

AGND

Analog ground.

6

PWMI

PWM signal input. Apply a PWM signal on PWMI for brightness control. A 100Hz to

20kHz dimming signal is recommended. PWMI is weakly pulled low internally.

9

LED6

LED string 6 current input. LED6 is the open-drain output of an internal dimming control

switch. Connect the LED string 6 cathode to LED6.

10

LED5

LED string 5 current input. LED5 is the open-drain output of an internal dimming control

switch. Connect the LED string 5 cathode to LED5.

11

ISET

LED current setting. Tie a current setting resistor from ISET to GND to program the

current in each LED string.

12

LED4

LED string 4 current input. LED4 is the open-drain output of an internal dimming control

switch. Connect the LED string 4 cathode to LED4.

13

LED3

LED string 3 current input. LED3 is the open-drain output of an internal dimming control

switch. Connect the LED string 3 cathode to LED3.

14

LED2

LED string 2 current input. LED2 is the open-drain output of an internal dimming control

switch. Connect the LED string 2 cathode to LED2.

15

LED1

LED string 1 current input. LED1 is the open-drain output of an internal dimming control

switch. Connect the LED string 1 cathode to LED1.

16

OVP

Over-voltage protection input. Connect a resistor divider from the output to OVP 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.

22

COMP

Step-up converter compensation. COMP is used to compensate the regulation control

loop. Connect a capacitor or a series R-C network from COMP to GND.

23

VIN

Power supply input. VIN supplies power to the IC. Drive VIN with a 3V to 26V power

source. VIN must be bypassed locally.

24

VCC

Internal 5V linear regulator output. VCC provides a 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.