IR3897 IRF [International Rectifier], IR3897 Datasheet - Page 35

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

VDDQ=1.2V
Vin=1.2V
1.5k
35
R6
PGood
1.5k
R6
Ext VCC
PGood
1.5k
Vin=1.2V
1.5k
AUGUST 08, 2012 |DATA SHEET | Rev 3.3
R8
R
49.9k
Vin=12 V
49.9k
PG
R
R8
PG
39.2 K
Figure 31: Application Circuit for a 1.2V to 0.6V, 4A, VTT rail
Figure 30: Application Circuit for a 12V to 0.6V, 4A, VTT rail
R
39.2 K
10nF
C7
t
2.2uF
R
C
10nF
Vcc
2.2uF
C7
t
C
Vcc
Enable
Vcc/LDO_out
Rt/Sync
PGood
S_Ctrl
Vp
Vcc/LDO_out
Rt/Sync
Single‐Input Voltage, Synchronous Buck Regulator
PGood
S_Ctrl
Vp
49.9k
R2
7.5k
R1
Vref
Vin
Vref
Enable
Gnd
IR3897
Enable
Gnd
IR3897
Cvin
1.0uF
- 35 -
Vin
PVin
4A Highly Integrated SupIRBuck
PGnd
C6
PVin
0.1uF
PGnd
C6
0.1uF
U1
Comp
Vsns
C
Boot
U1
Comp
SW
in
Vsns
Fb
C
Boot
= 3 X 22uF
in
SW
Fb
= 3 X 10 uF
0. 1 uF
5.6nF
C3
C1
0. 1 uF
15nF
C3
C1
110pF
(optional)
C2
(optional)
220pF
N/S
4.64k
N/S
C2
0.4uH
R3
5.62k
2.1k
R7
680nH
Lo
R3
5.36k
R7
Lo
5.62k
R5
5.36k
R5
TM
182
2.2nF
C4
R4
2.2nF
169
C4
R4
Co=5X22uF
Co=5X22uF
IR3897
Vo=0.6V
PD‐97663
0.1uF
Vo=0.6V
C5
0.1uF
C5