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MP9447 Datasheet(PDF) 8 Page - Monolithic Power Systems

No. de Pieza. MP9447
Descripción  High-Efficiency, Fast-Transient, 5A, 36V Synchronous, Step-Down Converter
Descarga  19 Pages
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Fabricante  MPS [Monolithic Power Systems]
Página de inicio  http://www.monolithicpower.com
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MP9447 Datasheet(HTML) 8 Page - Monolithic Power Systems

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MP9447–HIGH-EFFICIENCY, FAST-TRANSIENT, SYNCHRONOUS, STEP-DOWN CONVERTER
MP9447 Rev. 1.2
www.MonolithicPower.com
8
1/5/2016
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
PIN FUNCTIONS
Pin #
Name
Description
1
AGND
Analog Ground.
2
FREQ
Frequency Set (for CCM). The input voltage and the frequency-set resistor
connected to GND determine the ON period. Decouple with a 1nF capacitor.
3
FB
Feedback. The tap of external resistor divider from the output to GND sets the
output voltage.
4
SS
Soft-Start. Connect an external capacitor to program the soft-start time for the
switch-mode regulator. When the EN pin goes HIGH, an internal current source
(8.5µA) charges up the capacitor and the SS voltage slowly and smoothly ramps
up from 0 to VFB. When the EN pin goes LOW, the internal current source
discharges the capacitor and the SS voltage slowly ramps down.
5
EN
Enable. EN=1 to enable the MP9447. For automatic start-up, connect EN pin to IN
with a 100kΩ resistor. It includes an internal 1MΩ pull-down resistor.
6
NC
No Connection. DO NOT CONNECT. The pin must be float.
7
BST
Bootstrap. Requires a 0.1µF-to-1µF capacitor connected between SW and BS pins
to form a floating supply across the high-side switch driver.
8, 19,
Exposed pads
21, 22, 23
IN
Supply Voltage. The MP9447 operates from a 4.5V-to-36V input rail. Requires CIN
to decouple the input rail. Connect using wide PCB traces and multiple vias.
9, 10, 17, 18,
Exposed pads
24, 25
SW
Switch Output. Connect using wide PCB traces and multiple vias.
11-16
PGND
System Ground. This pin is the reference ground of the regulated output voltage.
For this reason care must be taken in PCB layout.
20
VCC
Internal Bias Supply. Decouple with a 1µF capacitor as close to the pin as
possible.


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