MPQ8632 HIGH EFFICIENCY 18V SYNCHRONOUS STEP-DOWN CONVERTER FAMILY FOR 4A TO 20A
BLOCK DIAGRAM
IN
FREQ
VCC
LDO
VCC
BST
BIAS
BST
Minimum
OFF Timer
REFERENCE
EN
SS
ON
HS
HS-FET
Timer
Driver
LOGIC
SW
SOFT START
VCC
FB
PG
LS
Driver
LS-FET
FB
Comparator
ZCD
Current
Modulator
UV
GND
UV Detect
Comparator
PGOOD
Comparator
LS Current
Limit
AGND
OV
OV Detect
Comparator
Figure 1—Functional Block Diagram
MPQ8632 Rev.1.24
8/28/2013
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