MP2562 – 1A, 4MHz, 50V STEP-DOWN CONVERTER
PIN FUNCTIONS
QFN SOIC8
Pin # Pin #
Name Description
Switch Node. This is the output from the high-side switch. A low forward drop
Schottky diode to ground is required. The diode must be close to the SW pins to
reduce switching spikes.
1, 2
1
SW
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.
3
4
2
3
EN
Compensation. This node is the output of the error amplifier. Control loop frequency
compensation is applied to this pin.
COMP
Feedback. This is the input to the error amplifier. The output voltage is set by a
resistive divider connected between the output and GND which scales down VOUT
equal to the internal +0.8V reference.
5
4
FB
GND, Ground. It should be connected as close as possible to the output capacitor to
Exposed shorten the high current switch paths. Connect exposed pad (QFN Package Only) to
Pad* ground plane.
6
7
5
6
7
8
Switching Frequency Program Input. Connect a resistor from this pin to ground to set
the switching frequency.
FREQ
Input Supply. This supplies power to all the internal control circuitry, both BST
8, 9
10
VIN
regulators and the high-side switch. A decoupling capacitor to ground must be placed
close to this pin to minimize switching spikes.
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.
BST
* Note: exposed pad applies to QFN package only.
MP2562 Rev. 1.0
2/28/2014
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