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Preliminary Specification describes products that are not in full production at the time of printing. Specifications are based on design goals and
limited characterization. In the process of final product release, specification. Contact Fairchild Semiconductor for current information.
P
www.fairchildsemi.com
Pentium is a registered trademark of Intel Corporation. Programmable Active Droop is a trademark of Fairchild Semiconductor.
Rev. 0.8.2
Features
¥ P
rogrammable output for Vcore from 1.3V to 3.5V using
an integrated 5-bit DAC
Controls adjustable linears for Vagp (selectable 1.5V/3.3V),
Vclock (2.5V), and Vtt (1.5V) or Vnorthbridge (1.8V)
Meets VRM specification with as few as 5 capacitors
Meets 1.550V +40/-70mV over initial tolerance,
temperature and transients
Remote sense
Programmable Active Droop (Voltage Positioning)
Drives N-Channel MOSFETs
Overcurrent protection using MOSFET sensing
85% efficiency typical at full load
Integrated Power Good and Enable/Soft Start functions
24 pin SOIC package
Applications
Power supply for Pentium
III Camino Platform
Power supply for Pentium III Whitney Platform
VRM for Pentium III processor
Programmable multi-output power supply
Description
The RC5058 is a synchronous mode DC-DC controller IC
which provides a highly accurate, programmable set of output
voltages for multi-voltage platforms such as the Intel Camino,
and provides a complete solution for the Intel Whitney and other
high-performance processors. The RC5058 features remote
voltage sensing, independently adjustable current limit, and a
proprietary Programmable Active Droop
for optimal converter
transient response. The RC5058 uses a 5-bit D/A converter
to program the output voltage from 1.3V to 3.5V. The RC5058
uses a high level of integration to deliver load currents in excess
Block Diagram
VID3
VID2
VID1
16
VID0
GNDP
23
22
2
18
24
1
17
-
+
-
+
OSC
1.24V
Reference
Digital
Control
Power
Good
5-Bit
DAC
VID4
8 7 6 5 4
+5V
+12V
PWRGD
-
+
ENABLE/SS
VCC
GNDA
3
LODRV
HIDRV
VCCP
21
VCCA
+5V
20
-
REF
REF
PWRGD,
OCL
PWRGD,
OCL
+3.3V
+1.5V
10
9
+2.5V
12
1
19
OCL
-
+
VCCP
PWRGD, OCL
V
3.3/1.5V
15
14
13
R
D
R
S
-
+
+
-
+
-
+
RC5058
High Performanc e Programmable S ync hronous
DC-DC Controller for Multi-Voltage Platforms