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IR3897 Datasheet(PDF) 34 Page - International Rectifier

Part # IR3897
Description  4A HIGHLY INTEGRATED SUPLRBUCK
PDF  45 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR3897 Datasheet(HTML) 34 Page - International Rectifier

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AUGUST 08, 2012 |DATA SHEET |    Rev 3.3
34
IR3897 
4A Highly Integrated SupIRBuck
TM  
Single‐Input Voltage, Synchronous Buck Regulator  
PD‐97663
Boot
Vcc/LDO_out
Fb
Comp
Gnd
PGnd
SW
S_Ctrl
Vo=1V
PGood
Enable
Rt/Sync
Vin= 5V
Vin
Vp
R5
3.32k
3.32k
Co=4X22uF
Lo
1uH
C4
2.2nF
R4
100
R3
3.01k
C3
5.6nF
C2
100pF
C1
0. 1 uF
Cin = 3 X10uF
Rt
39.2
.K
RPG
49.9K
IR3897
2.2uF
CVcc
PVin
Vref
1nF
Cref
Vsns
R6
R7
3.32k
3.32k
R8
U1
C5
0.1uF
C6
0.1uF
PGood
Enable
 
Figure 29: Application Circuit for a 5V to 1V, 4A Point of Load Converter 
 
 
Suggested bill of materials for the application circuit 5V to 1V 
Part Reference
Qty
Value
Description
Manufacturer
Part Number
Cin
3
10uF
1206, 25V, X5R, 20%
TDK
C3216X5R1E106M
C1 C5 C6
3
0.1uF
0603, 25V, X7R, 10%
Murata
GRM188R71E104KA01B
Cref
1
1nF
0603,50V,X7R, 10%
Murata
GRM188R71H102KA01B
C4
1
2200pF
0603,50V,X7R
Murata
GRM188R71H222KA01B
C2
1
100pF
0603, 50V, NP0, 5%
Murata
GRM1885C1H101JA01D
Co
4
22uF
0805, 6.3V, X5R, 20%
TDK
C2012X5R0J226M
CVcc
1
2.2uF
0603, 16V, X5R, 20%
TDK
C1608X5R1C225M
C3
1
5.6nF
0603, 50V, X7R, 10%
Murata
GRM188R71H562KA01D
Cvin
1
1.0uF
0603, 25V, X5R, 10%
Murata
GRM188R61E105KA12D
Lo
1
1uH
SMD 6.86x6.47x5mm,4.7mΩ
TDK
SPM6550T-1R0M
R3
1
3.01k
Thick Film, 0603,1/10W,1%
Panasonic
ERJ-3EKF3011V
R5 R6 R7 R8
4
3.32K
Thick Film, 0603,1/10W,1%
Panasonic
ERJ-3EKF3321V
R4
1
100
Thick Film, 0603,1/10W,1%
Panasonic
ERJ-3EKF1000V
Rt
1
39.2K
Thick Film, 0603,1/10W,1%
Panasonic
ERJ-3EKF3922V
Rpg
2
49.9K
Thick Film, 0603,1/10W,1%
Panasonic
ERJ-3EKF4992V
U1
1
IR3897
PQFN 4x5mm
IR
IR3897MPBF
 
 



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