MP3306-

--

-30V 700kHz SYNCHRONOUS STEP-UP WHITE LED DRIVER

MP3306 Rev.1.0

www.MonolithicPower.com

4

3/6/2013

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2013 MPS. All Rights Reserved.

PIN FUNCTIONS

Pin #

Name Pin Function

1

IN

Input Supply Pin. It provides the power for internal driver and logic circuit. Must be locally

bypassed.

2

VCC

The Internal 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.

3

EN

EN Control Input. A voltage greater than 1.1V turns the part on and less than 0.6V turns the

part off.

4

PWMI

Apply a PWM signal on this pin for brightness control. This signal is uniformed and filtered at

PWMO pin with an internal 100k

resistance. With a capacitor at PWMO pin, the duty cycle

from 0% to 100% at PWMI pin is converted to 0V to 1.2V DC voltage at PWMO pin.

5

PWMO

PWM Filter Output. Connect a capacitor from PWMO to GND. The voltage on this pin range

0V to 1.2V linearly controls the feedback voltage from 0V to 0.2V.

To use PWM dimming, connect the PWM input signal to PWMI pin.

To use analog dimming, connect the analog input voltage to PWMO pin.

6

OVP

Over Voltage Protection Pin. Use one external resistor voltage divider to program OVP

threshold. When the OVP pin voltage reaches the shutdown threshold 1.22V, the IC will be

turned off and latch up until EN is toggled again.

7

FB

Feedback Input. The MP3306 regulates the voltage across the current sense resistor

between FB and VOUT. Connect a current sense resistor from VOUT to the LED string.

Connect the anode of the LED string to FB. The regulation voltage is 202mV.

8

GND

Ground.

9

OUT

The OUTPUT terminal. Connect the output cap on this pin, the output capacitor must be

ceramic type and be placed as short as possible between OUT pin and GND pin.

10

SW

Power Switch Node. SW is the drain of the internal low side MOSFET switch. Connect the

power inductor to SW.

11

BST

Bootstrap. A capacitor is connected between SW and BST pins to form a floating supply to

drive the high side MOSFET.

12

L

Power input pin. L is the source of internal disconnection MOSFET. Connect the inductor to

this pin.