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PRODUCT SPECIFICATION
RC5057
9
Table 2. RC5057 Application Bill of Materials for Intel Pentium II & III Processors
(Components based on Worst Case Analysis—See Appendix for Details)
*See Table 3.
Notes:
1. Inductor L1 is recommended to isolate the 5V input supply from noise generated by the MOSFET switching, and to comply
with Intel dI/dt requirements. L1 may be omitted if desired.
2. For designs using the TO-220 MOSFETs, heatsinks with thermal resistance
the TO-263 MOSFETs, adequate copper area should be used. For details and a spreadsheet on MOSFET selections, refer
to Applications Bulletin AB-8.
Θ
SA
< 20°C/W should be used. For designs using
Table 3. Recommended Values for CPU-based Applications
*Output capacitance requirements depend critically on layout and processor type. Consult Application Bulletin AB-14 for
details. See the Appendix to this datasheet for the method of calculation of these components. Pin 4 must be used to remote
sense the voltage at the processor to achieve the specified performance.
Reference
C1
Manufacturer Part #
AVX
TAJB475M010R5
Panasonic
ECU-V1C105ZFX
Panasonic
ECU-V1H104ZFX
Sanyo
10MV1200GX
Sanyo
6MV1500GX
Motorola
MBRD835L
Any
Quantity
1
Description
4.7μF, 10V Capacitor
Requirements/Comments
C2, C5
2
1μF, 16V Capacitor
C3-4,6
3
100nF, 50V Capacitor
C
IN
*
1200μF, 10V Electrolytic
I
RMS
= 2A
C
OUT
*
1500μF, 6.3V Electrolytic
ESR
≤
44m
D1
1
8A Schottky Diode
L1
Optional
2.5μH, 10A Inductor
DCR ~ 6m
See Note 1.
DCR ~ 2m
R
DS(ON)
See Note 2.
L2
Q1
Any
Fairchild
FDP6030L or
FDB6030L
Fairchild
FDP7030BL or
FDB7030BL
Any
Any
Any
Any
Any
Fairchild
RC5057M
1
1
1.3μH, 20A Inductor
N-Channel MOSFET
(TO-220 or TO-263)
= 20m
@ V
GS
= 4.5V
Q2
1
N-Channel MOSFET
(TO-220 or TO-263)
R
See Note 2.
DS(ON)
= 10m
@ V
GS
= 4.5V
R1
R2-3
R4
R5
R6
U1
1
2
1
1
1
1
33
4.7
10K
*
10
DC/DC Controller
Processor
Coppermine
Katmai
Mendocino
Katmai
Chipset
C
IN
3
4
4
5
C
OUT
*
4
6
5
6
R5 (K
)
8.45
13.0
11.3
11.8
Whitney
Camino
Whitney
BX