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MP2560 Datasheet(PDF) 4 Page - Monolithic Power Systems

Part No. MP2560
Description  2.5A, 4MHz, 42V Step-Down Converter
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Maker  MPS [Monolithic Power Systems]
Homepage  http://www.monolithicpower.com
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MP2560 Datasheet(HTML) 4 Page - Monolithic Power Systems

 
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MP2560 – 2.5A, 4MHz, 42V STEP-DOWN CONVERTER
MP2560 Rev. 1.2
www.MonolithicPower.com
4
1/25/2010
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 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 forward drop
Schottky diode to ground is required. The diode 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 error amplifier. Control loop frequency
compensation is applied to this pin.
5
4
FB
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.
6
5
GND,
Exposed
Pad
Ground. It should be connected as close as possible to the output capacitor to
shorten the high current switch paths. Connect exposed pad to ground plane.
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 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.


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