MP3383

– 4-STRING, MAX 80V VOUT, STEP-UP WLED CONTROLLER

MP3383 Rev. 1.0

MonolithicPower.com

4

5/2/2022

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PIN FUNCTIONS

TSSOP-16EP

Pin #

SOIC-16

Pin #

Name

Description

1

13

LED1

LED string 1 current input. Connect the LED1 pin to the LED string 1

cathode.

2

14

LED2

LED string 2 current input. Connect the LED2 pin to the LED string 2

cathode.

3

15

GND

Ground.

4

16

LED3

LED string 3 current input. Connect the LED3 pin to the LED string 3

cathode.

5

1

LED4

LED string 4 current input. Connect the LED4 pin to the LED string 4

cathode.

6

2

ISET

LED current setting. Connect a current-setting resistor from the ISET pin to

GND to configure the current in each LED string.

7

3

OVP

Output over-voltage protection (OVP) setting. Connect a resistor divider

from the output to the OVP pin to configure the OVP threshold.

8

4

OSC

Switching frequency (fSW) setting. Connect a resistor between the OSC

pin and GND to set the step-up converter

’s fSW.

9

5

EN

Enable control input. A voltage exceeding 1.2V turns the part on; a voltage

below 0.4V turns the part off. Do not float the EN pin.

10

6

ISENSE

Current-sense input. During normal operation, the ISENSE pin senses the

voltage across the external inductor current-sense resistor (RSENSE) for peak

current control mode. ISENSE also limits the inductor current (IL) during each

switching cycle. For cascading applications, connect the slave IC

’s ISENSE

to GND. Do not float ISENSE.

11

7

GATE

Step-up converter MOSFET driver output. The GATE pin drives the

external power N-channel MOSFET.

12

8

VCC

The internal 12V linear regulator output. The VCC pin provides the power

supply for the external MOSFET gate driver and the internal control circuitry.

Bypass VCC to GND using a ceramic capacitor.

13

9

VIN

Supply input. The VIN pin must be bypassed locally.

14

10

ADIM

Input signal for analog brightness control. The LED current amplitude is

determined by the duty cycle of the PWM signal applied to the ADIM pin. An

internal R

C filter (10MΩ resistor and 100pF capacitor) is integrated into

ADIM. A frequency exceeding 20kHz is recommended to achieve better

PWM signal filtering performance and ensure that the high-level ADIM

voltage (VADIM) exceeds 1.2V and the low-level VADIM is below 0.4V.

15

11

COMP

Step-up converter compensation. The COMP pin compensates for the

regulation control loop. Connect a ceramic capacitor or a resistor combined

with a capacitor from COMP to GND.

16

12

PWM

Input signal for PWM brightness control. By applying a PWM signal on

this pin, the LED current is chopped, and the average current is equal to ISET

x DDIM, where ISET is the LED current value set by a resistor between the ISET

pin and GND, and DDIM is the

PWM input signal’s duty cycle. Ensure that the

high-level voltage exceeds 1.2V and the low-level voltage is below 0.4V. If

the PWM pin is floating, weakly pull it to GND internally.

/

EP

Exposed pad. Connect the exposed pad to GND.