MP2488 – 2A, 200kHz, 55V HIGH-POWER LEDS DRIVER
MP2488 Rev. 1.0 www.MonolithicPower.com 4
6/20/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
PIN FUNCTIONS
QFN
Pin #
SOIC8
Pin #
Name Description
1, 2 1 SW
Switch Node. This is the output from the high-side switch. A low V
F
Schottky rectifier
to ground is required. The rectifier must be close to the SW pins to reduce switching
spikes.
3 2 EN
Enable Input. Pulling this pin below the specified threshold shuts the chip down.
Pulling it up above the specified threshold or leaving it floating enables the chip.
4 3 COMP
Compensation. This node is the output of the GM error amplifier. Control loop
frequency compensation is applied to this pin.
5 4 FB
Feedback. This is the input to the error amplifier. An external current sensing resistor
is connected in series with the LEDs to GND. The feedback voltage is connected to
this pin and is compared to the internal +200mV reference to set the regulation
current.
6 5
GND,
Exposed
pad
Ground. It should be connected as close as possible to the output capacitor avoiding
the high current switch paths. Connect exposed pad to GND plane for optimal thermal
performance.
7 6 FREQ
Switching Frequency Program Input. Connect a resistor from this pin to ground to set
the switching frequency.
8, 9 7 VIN
Input Supply. This supplies power to all the internal control circuitry, both BS
regulators and the high-side switch. A decoupling capacitor to ground must be placed
close to this pin to minimize the switching spikes.
10 8 BST
Bootstrap. This is the positive power supply for the internal floating high-side
MOSFET driver. Connect a bypass capacitor between this pin and SW pin.
