W83321S Datasheet, PDF (8/18 Pages) Winbond – N-Channel FET Synchronous Buck Regulator Controller

W83321S/W83321G
cycle is initiated. If the cause of the overcurrent is still present after the delay interval, the current limit
would be triggered again. The shut dowm - delay - soft start cycle will be repeated indefinitely untill the
overcurrent event has cleared.
I_PEAK = (I_OCSET x R_OCSET) / R_DS(ON) R_DS(ON):Low Side MOSFET Resistance
7. APPLICATION CIRCUIT
Local charge pump for VBOOT application:
R1 3.7K
C1 0.1uF
VOUT=0.8X(R5+R6)/R6
C6
2000uF
C7
2000uF
L1 3.3uH
C8
0.1uF
VCC5
C2 C3 Q1
2000uF 1uF
N DSG
D1
1
1N4148/Shuttky
3
2
U1
BOOT
UGATE
ISEN ⁸
COMP ⁷
R3
2.2
C10
6.8nF
Q2
3
N DSG
3 _GND
FB ⁶
4
LGATE
5
VCC
W83321S
R5 16K(1%)
C4 (OPT)
C5 2.2nF R2 100K
R4 10
C9
1uF
VCC5
R6
7.5K(1%)
Separate VCC12 rail for VBOOT application:
R1 3.7K
VCC12
R7 10
C1
C11
VCC5 1000uF
1uF
VOUT=0.8X(R5+R6)/R6
L1 3.3uH
C2 C3 Q1
2000uF 1uF
3
N DSG
C6
2000uF
C7
2000uF
C8
0.1uF
R3
2.2
C10
6.8nF
Q2
3
N DSG
U1
1 _BOOT
ISEN ⁸
2
UGATE
7
COMP
3 _GND
FB ⁶
4 _LGATE
VCC ⁵
W83321S
R5 16K(1%)
C4 (OPT)
C5 2.2nF R2 100K
R4 10
C9
1uF
VCC5
R6
7.5K(1%)
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