W83321G Nuvoton Technology Corporation of America, W83321G Datasheet - Page 8

• Manufacturer Part Number: W83321G
• Description: IC BUCK SYNC ADJ 8SOIC
• Manufacturer: Nuvoton Technology Corporation of America
• Type: Step-Down (Buck)r

Specifications of W83321G

• Internal Switch(s): No
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 0.8 ~ 5 V
• Frequency - Switching: 250kHz
• Voltage - Input: 5V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Power - Output: -

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
7. APPLICATION CIRCUIT
Local charge pump for VBOOT application:
Separate VCC12 rail for VBOOT application:
PEAK
VOUT=0.8X(R5+R6)/R6
VOUT=0.8X(R5+R6)/R6
= (I
OCSET
x R
C6
2000uF
C6
2000uF
OCSET
C7
2000uF
C7
2000uF
) / R
DS(ON)
0.1uF
C8
0.1uF
C8
L1
L1
3.3uH
3.3uH
R
DS(ON)
R3
2.2
6.8nF
C10
R3
2.2
6.8nF
C10
:Low Side MOSFET Resistance
2000uF
C2
2000uF
C2
C3
1uF
N DSG
N DSG
VCC12
C3
1uF
N DSG
N DSG
- 8 -
VCC5
Q1
Q2
VCC5
Q1
Q2
3
3
1000uF
C1
3
3
C1 0.1uF
R7 10
D1
1N4148/Shuttky
C11
1uF
W83321S/W83321G
1
2
3
4
1
2
3
4
BOOT
UGATE
GND
LGATE
U1
R5 16K(1%)
BOOT
UGATE
GND
LGATE
U1
R5 16K(1%)
R1 3.7K
R1 3.7K
W83321S
W83321S
COMP
ISEN
COMP
VCC
R6
7.5K(1%)
ISEN
VCC
R6
FB
7.5K(1%)
FB
8
7
6
5
8
7
6
5
C5 2.2nF
C5 2.2nF
R4 10
C9
1uF
R4 10
C9
1uF
C4 (OPT)
C4 (OPT)
R2 100K
VCC5
R2 100K
VCC5