NB675 –24V, HIGH CURRENT SYNCHRONOUS BUCK CONVERTER
BLOCK DIAGRAM
VCC
VDDQSEN
VIN
BSTREG
BST
Soft-
start
POR &
Reference
VIN
0.6V VREF
On Time
One Shot
FB
Gate
Control
Logic
SW
Min off time
EN1/EN2
VDDQ
PGND
PG
1V
SW
OCP
POK
OVP
% Vref
130% Vref
Fault
Logic
95
AGND
VINLDO
VTT
UVP
60%Vref
EN1/EN2
Control
Logic
VTTREF
VTTSEN
Figure 1—Functional Block Diagram
NB675 Rev. 1.0
1/14/2013
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