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MP28253EL Datasheet(PDF) 14 Page - Monolithic Power Systems

Part # MP28253EL
Description  21V, 3A, 500kHz Synchronous Step-down Converter
PDF  15 Pages
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Manufacturer  MPS [Monolithic Power Systems]
Direct Link  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP28253EL Datasheet(HTML) 14 Page - Monolithic Power Systems

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MP28253 – 3A, 21V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
MP28253 Rev. 1.02
www.MonolithicPower.com
14
12/25/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
External Bootstrap Diode
An external bootstrap diode may enhance the
efficiency of the regulator, the applicable
conditions of external BST diode is:
Duty cycle is high: D=
IN
OUT
V
V
>65%
In this case, an external BST diode is
recommended from the VCC pin to BST pin, as
shown in Figure 8
SW
BST
MP28253
C
L
BST
COUT
External BST Diode
VCC
IN4148
Figure 8—Add Optional External Bootstrap
Diode to Enhance Efficiency
The recommended external BST diode is IN4148,
and the BST cap is 0.1~1µF.



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