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MP28248 Datasheet(PDF) 4 Page - Monolithic Power Systems

Part No. MP28248
Description  High-Efficiency, Fast-Transient, 3A, 4.2V-20V Input Synchronous Step-down Converter in a QFN12 (2x3mm) Package
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Maker  MPS [Monolithic Power Systems]
Homepage  http://www.monolithicpower.com
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MP28248 Datasheet(HTML) 4 Page - Monolithic Power Systems

 
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MP28248 – 3A, 4.2V-20V INPUT, FAST-TRANSIENT SYNCHRONOUS STEP-DOWN CONVERTER IN QFN12 (2X3mm)
MP28248 Rev 1.0
www.MonolithicPower.com
4
1/5/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
PIN FUNCTIONS
QFN12
(2x3mm)
Pin #
Name
Description
1, 11, 12
GND
System Ground. Reference ground for the regulated output voltage. Requires special
consideration during PCB layout.
2, 10,
exposed pad
SW
Switch Output. Connect using wide PCB traces.
3
BST
Bootstrap. Requires a capacitor connected between SW and BST pins to form a
floating supply across the high-side switch driver.
4
VCC
Internal Bias Supply. Decouple with a 1µF ceramic capacitor as close to the pin as
possible.
5
EN
EN = 1 to enable the MP28248. For automatic start-up, connect EN pin to VIN with a
pull-up resistor.
6
SS
Soft-Start. Connect an external SS capacitor to program the soft-start time for the
switch mode regulator. When the EN pin goes high, an internal current source (14µA)
charges up the SS capacitor and the SS voltage smoothly ramps up from 0 to VFB.
When the EN pin goes low, an internal current source (4.5μA) discharges the SS
capacitor and the SS voltage smoothly drops.
7
FB
Feedback. Sets the output voltage when connected to the tap of an external resistor
divider that is connected between output and GND.
8
FREQ
Frequency. Set during CCM operation. Connect a resistor R7 to IN to set the switching
frequency. Decouple with a 1nF capacitor.
9
IN
Supply Voltage. The MP28248 operates from a +4.2V to +20V input rail. Requires C1 to
decouple the input rail. Use wide PCB traces and multiple vias to make the connection.


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