MP1498 – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
BLOCK DIAGRAM
IN
+
-
VCC
Regulator
RSEN
Currrent Sense
Amplifer
VCC
Boost
Regulator
BST
SW
Oscillator
HS
Driver
+
-
Comparator
On Time Control
Logic Control
1pF
VCC
Current Limit
Comparator
50pF
400k
Reference
EN/SYNC
LS
Driver
6.5V
1MEG
+
+
-
SS
FB
GND
Error Amplifier
Figure 1: Functional Block Diagram
MP1498 Rev. 1.01
12/18/2012
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