MP3306-30V 700kHz SYNCHRONOUS STEP-UP WHITE LED DRIVER
MP3306 Rev.1.01 www.MonolithicPower.com 4
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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 100kΩ 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 SW
Power Switch Node. SW is the
drain of the internal low side MOSFET switch. Connect the
power inductor to SW.
10 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.
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.
