IR3897 IRF [International Rectifier], IR3897 Datasheet - Page 33

• Manufacturer Part Number: IR3897
• Description: 4A HIGHLY INTEGRATED SUPLRBUCK
• Manufacturer: IRF [International Rectifier]

Figure 28b: Application Circuit for a 12V to 1.2V, 4A Point of Load Converter with External 5V VCC
External VCC=5V
33
Vin=12 V
AUGUST 08, 2012 |DATA SHEET | Rev 3.3
49.9K
R
PG
39.2 . K
R
2.2uF
t
C
Vcc
Vcc/LDO_out
Rt/Sync
S_Ctrl
PGood
Vp
100pF
Single‐Input Voltage, Synchronous Buck Regulator
Cref
Vref
Vin
Gnd
IR3897
49.9K
7.5K
R1
R2
Enable
- 33 -
PVin
4A Highly Integrated SupIRBuck
PGnd
C6
0.1uF
U1
Comp
Vsns
C
Boot
SW
in
Fb
= 3 X 10uF
0. 1 uF
10nF
C3
C1
2.37K
R8
C2
120pF
1.78k
R3
1.5 uH
Lo
3.32k
R7
3.32k
R5
2.37K
R6
TM
2.2nF
143
C4
R4
Co=4X22uF
IR3897
Vo=1.2V
PD‐97663
0.1uF
C5