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PDF RC5057M Data sheet ( Hoja de datos )
| Número de pieza | RC5057M | |
| Descripción | High Performance Programmable Synchronous DC-DC Controller for Low Voltage Microprocessors | |
| Fabricantes | Fairchild Semiconductor | |
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www.fairchildsemi.com
RC5057
High Performance Programmable Synchronous
DC-DC Controller for Low Voltage Microprocessors
Features
• Programmable output from 1.3V to 3.5V using an
integrated 5-bit DAC
• Remote sense
• Active Droop
• 85% efficiency typical at full load
• Integrated Power Good and Enable/Soft Start functions
• Drives N-channel MOSFETs
• Overcurrent protection using MOSFET sensing
• 16 pin SOIC package
• Meets Intel Pentium II & III specifications using
minimum number of external components
Applications
• Power supply for Pentium® II & III
• VRM for Pentium II & III processor
• Telecom line cards
• Routers, switches & hubs
• Programmable step-down power supply
Description
The RC5057 is a synchronous mode DC-DC controller IC
which provides a highly accurate, programmable output voltage
for all Pentium II & III CPU applications and other high-perfor-
mance processors. The RC5057 features remote voltage
sensing, adjustable current limit, and active droop for optimal
converter transient response. The RC5057 uses a 5-bit D/A
converter to program the output voltage from 1.3V to 3.5V.
The RC5057 uses a high level of integration to deliver load cur-
rents in excess of 16A from a 5V source with minimal exter-
nal circuitry. Synchronous-mode operation offers optimum
efficiency over the entire specified output voltage range. An
on-board precision low TC reference achieves tight tolerance
voltage regulation without expensive external components,
while active droop permits exact tailoring of voltage for the
most demanding load transients. The RC5057 also offers
integrated functions including Power Good, Output Enable/
Soft Start and current limiting, and is available in a 16 pin
SOIC package.
Block Diagram
OSC
+5V
VCCA 5
-
+
-
+
Digital
Control
-
-+
+
5-Bit
DAC
16 15141312
VID0 VID2 VID4
VID1 VID3
1.24V
Reference
11
GNDA
1
ENABLE/SS
Power
Good
+12V
3 RS
10
+5V
4
8 VCCP
9 HIDRV
7 LODRV
6
GNDP
2
PWRGD
Pentium is a registered trademark of Intel Corporation
VO
Rev. 1.2.0
1 page  
PRODUCT SPECIFICATION
Table 1. Output Voltage Programming Codes
VID4
VID3
VID2
011
011
011
011
010
010
010
010
001
001
001
001
000
000
000
000
111
111
111
111
110
110
110
110
101
101
101
101
100
100
100
100
Note:
1. 0 = processor pin is tied to GND.
1 = processor pin is open.
VID1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
VID0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
RC5057
Nominal VOUT
1.30V
1.35V
1.40V
1.45V
1.50V
1.55V
1.60V
1.65V
1.70V
1.75V
1.80V
1.85V
1.90V
1.95V
2.00V
2.05V
2.0V
2.1V
2.2V
2.3V
2.4V
2.5V
2.6V
2.7V
2.8V
2.9V
3.0V
3.1V
3.2V
3.3V
3.4V
3.5V
REV. 1.2.0 2/10/00
5
5 Page 
PRODUCT SPECIFICATION
RC5057
Table 3. RC5057 Application Bill of Materials for Coppermine/Camino Processors
(Components based on Worst Case Analysis—See Appendix for Details)
Reference
C1
C2, C5
C3-4,6
CIN
COUT
D1
D2
L1
L2
Q1
Q2
R1
R2-3
R4
R5
R6
R7
R8
R9
R10
U1
Manufacturer Part #
AVX
TAJB475M010R5
Panasonic
ECU-V1C105ZFX
Panasonic
ECU-V1H104ZFX
Sanyo
10MV1200GX
Sanyo
6MV1500GX
Motorola
MBRD835L
Fairchild
1N4148
Any
Any
Fairchild
FDP6030L or FDB6030L
Fairchild
FDP7030BL or
FDB7030BL
Any
Any
Any
Any
Any
N/A
Any
Any
Dale
WSL-2512-.01Ω
Fairchild
RC5057M
Quantity
1
2
3
3
10
1
1
Optional
1
1
1
1
2
1
1
1
1
1
1
1
1
Description
4.7µF, 10V Capacitor
Requirements/Comments
1µF, 16V Capacitor
100nF, 50V Capacitor
1200µF, 10V
Electrolytic
1500µF, 6.3V
Electrolytic
8A Schottky Diode
IRMS = 2A
ESR ≤ 44mΩ
Signal Diode
2.5µH, 10A Inductor
1.3µH, 20A Inductor
N-Channel MOSFET
(TO-220 or TO-263)
N-Channel MOSFET
(TO-220 or TO-263)
DCR ~ 6mΩ See Note 1.
DCR ~ 2mΩ
RDS(ON) = 20mΩ @ VGS = 4.5V
See Note 2.
RDS(ON) = 10mΩ @ VGS = 4.5V
See Note 2.
33Ω
4.7Ω
10KΩ
2.80KΩ
10Ω
1.8mΩ
2.1Ω
1KΩ
10mΩ, 1W Resistor
PCB Trace Resistor
DC/DC Controller
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 ΘSA < 20°C/W should be used. For designs using
the TO-263 MOSFETs, adequate copper area should be used. For details and a spreadsheet on MOSFET selections, refer
to Applications Bulletin AB-8.
REV. 1.2.0 2/10/00
11
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| PDF Descargar | [ Datasheet RC5057M.PDF ] | |
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