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MP28257 Datasheet(PDF) 8 Page - Monolithic Power Systems

Part # MP28257
Description  4A, Fast Transient, 4.2V-to-20V Input Synchronous Step-Down Converter 2mmx3mm QFN12
PDF  16 Pages
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Manufacturer  MPS [Monolithic Power Systems]
Direct Link  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP28257 Datasheet(HTML) 8 Page - Monolithic Power Systems

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MP28257 –4A, 4.2V-TO-20V, FAST TRANSIENT, SYNCHRONOUS STEP-DOWN CONVERTER
MP28257 Rev 1.0
www.MonolithicPower.com
8
11/8/2011
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
BLOCK DIAGRAM
START
-
+
+
-
+
SOFT
START/STOP
FREQ
VCC
5V LDO
ILIM
OC
Q
VCC
SW
GND
0
VCC
IN
BST
RSEN
LS
Driver
HS
Driver
LS_FET
HS_FET
PWM
LOGIC
xS
xR
Over-Current
Timer
Current Sense
Amplifer
Current
Modulator
UV
OV
UV Detect
Comparator
OV Detect
Comparator
OFF
Timer
ON
Timer
HS IIimit
Comparator
Loop
Comparator
EN
1.0V
0.8V
1MEG
0.4V
0
FB
PGOOD
Comparator
REFERENCE
PG
+
-
-
+
Figure 1: Functional Block Diagram



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