MP3384L – 50V, 4-STRING, WHITE LED DRIVER

MP3384L Rev. 1.0

www.MonolithicPower.com

4

12/27/2013

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© 2013 MPS. All Rights Reserved.

PIN FUNCTIONS

Pin #

Name

Description

1

EN

Enable Control Input. Do not float.

2

OSC

Switching Frequency Set. When floating or connected to VCC, the switching frequency is

1.25MHz. When connected to GND, the switching frequency is 625kHz.

3

ISET

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

current in each LED string.

SET

LED

R

V

.

I

21

1

1000





4

GND

Analog Ground.

5

PWM

PWM Input. Controls the PWM-burst-mode dimming frequency and duty cycle.

6

LED1

LED String 1, Current Input. The open-drain output of an internal, dimming-control switch.

Connect the LED String 1 cathode to this pin. If not used, connect Vout to this pin.

7

LED2

LED String 2, Current Input. The open-drain output of an internal, dimming-control switch.

Connect the LED String 1 cathode to this pin. If not used, connect Vout to this pin.

8

LED3

LED String 3, Current Input. The open-drain output of an internal, dimming-control switch.

Connect the LED String 1 cathode to this pin. If not used, connect Vout to this pin.

9

LED4

LED String 4, Current Input. The open-drain output of an internal, dimming-control switch.

Connect the LED String 1 cathode to this pin. If not used, connect Vout to this pin.

10

OVP

Over-Voltage Protection. Connect to the tap of a resistor divider to program the OVP

11

NC

No Connection.

12

PGND

Power Ground.

13

SW

Power-Switch Output. Drain of the internal MOSFET. Connect the power inductor and

14

COMP

Compensation. Compensates the regulatory control loop. Connect a capacitor or a series

RC network from COMP to GND.

15

VCC

Internal, 5V, Linear-Regulator Output. Powers the internal MOSFET’s gate driver and the

internal-control circuitry. Bypass VCC to GND with a ceramic capacitor.

16

VIN

Supply Input. Powers the MP3384L chip. Apply a 3V-to-25V power source. Requires local

bypassing.

Exposed

Pad

Connect to PGND