RC5061 Datasheet, PDF (1/18 Pages) Fairchild Semiconductor – High Performance Programmable Synchronous DC-DC Controller for Multi-Voltage Platforms

www.fairchildsemi.com
RC5061
High Performance Programmable Synchronous
DC-DC Controller for Multi-Voltage Platforms
Features
• Programmable output for Vcore from 1.3V to 3.5V using
an integrated 5-bit DAC
• Controls adjustable linears for Vtt (1.5V), and Vclock
(2.5V)
• Meets VRM specification with as few as 5 capacitors
• Meets 1.550V +40/-70mV over initial tolerance,
temperature and transients
• Remote sense
• 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
• 20 pin SOIC package
Block Diagram
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 RC5061 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 RC5061 features remote
voltage sensing, independently adjustable current limit, and
Active Droop for optimal converter transient response. The
RC5061 uses a 5-bit D/A converter to program the output
voltage from 1.3V to 3.5V. The RC5061 uses a high level of
integration to deliver load currents in excess of 16A from a 5V
+3.3V
+5V
VCCA 17
9
10
+1.5V
11
+
-
VCCP
+
-
REF
PWRGD,
OCL
REF
OCL
PWRGD,
12
+2.5V
OSC
OCL
-
+
-
+
+12V
+5V
15
R_S
16
20 VCCP
1 HIDRV
-
-
+
+
5-Bit
DAC
8 765 4
VID0VID2 VID4
VID1 VID3
1.24V
Reference
3
GNDA
Digital
Control
13
ENABLE/SS
Power
Good
2
19 LODRV
18
GNDP
14
PWRGD
VCC
Pentium is a registered trademark of Intel Corporation.
REV. 1.0.0 7/6/00