MP3384L – 50V, 4-STRING, WHITE LED DRIVER
MP3384L Rev. 1.0 www.MonolithicPower.com 4
12/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 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
2111000
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
threshold. Triggers OVP protection when V
OVP
reaches 1.23V.
11 NC No Connection.
12 PGND Power Ground.
13 SW
Power-Switch Output. Drain of the internal MOSFET. Connect the power inductor and
output rectifier to SW. V
SW
can swing between GND and 50V.
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
