MP3305 MPS, MP3305 Datasheet - Page 4

• Manufacturer Part Number: MP3305
• Description: 36v, 1.3a, Step-up White Led Driver With High Frequency True Pwm Dimming & Adjust Ovp
• Manufacturer: MPS

PIN FUNCTIONS
MP3305 Rev. 0.9
12/18/2009
QFN8
Pin #
2,8
1
3
4
5
6
7
Exposed
Name
GND,
ISET
OVP
LED
Pad
SW
EN
IN
MP3305 –36V, 1.3A, STEP-UP WHITE LED DRIVER WITH HIGH FREQUENCY TRUE PWM DIMMING & ADJUST OVP
Pin Function
Power Switch Output. SW is the drain of the internal MOSFET switch. Connect the power
inductor and output rectifier to SW. SW can swing between GND and 36V.
Ground. Connect exposed pad to GND plane for proper thermal performance.
Input Supply Pin. Must be locally bypassed.
Open Load Protection Adjusting pin. Connect a resistor divider from output to this pin to
adjust the OVP threshold. When this pin voltage reaches the shutdown threshold 0.9V, the
switch will be turned off
ON/OFF Control and Dimming Command Input. Holding EN pin low for more than 5ms will
turn the part off. To use PWM dimming, add a 250Hz to 50KHz square wave signal to this
pin.
LED Current Input. This pin is the open-drain output of an internal dimming control switch.
Connect the LED cathode to this pin.
LED Current Set. This pin is the source output of an internal dimming control switch. The
MP3305 regulates the voltage across the current setting resistor. Tie a current setting
resistor from this pin to ground. The regulation voltage is 200mV.
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