MPQ28261 – 21V, 3A, 500kHz SYNCHRONOUS STEP-DOWN CONVERTER
FUNCTIONAL BLOCK DIAGRAM
IN
VCC
Regulator
RSEN
Current Sense
Amplifier
VCC
Boost
Regulator
BST
SW
PG Comparator
PG
Oscillator
HS
Driver
Comparator
On Time
Control Logic
Control
1pF
VCC
Current Limit
Comparator
50pF
400 k
Reference
EN
FB
LS
Driver
1MEG
GND
Error Amplifier
SS
Figure 1: Functional Block Diagram
MPQ28261 Rev. 1.12
10/10/2013
www.MonolithicPower.com
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