Electronics
Semiconductor Division
RC5041
Programmable DC-DC Converter for Pentium
®
P55C, K6™, and 6x86MX™ (M2) Processors
Features
• Programmable output from 2.1V to 3.5V using integrated
4-bit DAC
• 87% efficiency
• Oscillator frequency adjustable from 200KHz to 1MHz
• On-chip Power Good function
• Excellent transient response
• Over-Voltage Protection
• Short Circuit Protection
• Power Good Function
• Precision trimmed low TC voltage reference
• 16 pin SOIC package
• Meets Intel Pentium VRM specifications using minimum
number of external components
Description
The RC5041 is a non-synchronous DC-DC controller IC
which provides an accurate, programmable output for
Pentium CPU applications. Using an integrated 4-bit DAC to
accept a voltage identification (VID), the RC5041 can gener-
ate precise output voltages between 2.1V and 3.5V in
100mV increments. Output load currents in excess of 10A
can be delivered using minimal external circuitry. The
RC5041 is designed to operate in a standard PWM control
mode under heavy load conditions and in PFM control mode
while supplying light loads for optimal efficiency. An on-
board precision low TC voltage reference eliminates the
requirement for external components in order to achieve
tight voltage regulation. The Pentium CPU is continuously
protected by an integrated Power Good function, which
sends an active-low interrupt signal to the CPU in the event
that the output voltage is out of tolerance. The internal oscil-
lator can be programmed to operate over a range of 200KHz
to 1MHz to allow flexibility in choosing external compo-
nents.
Preliminary Information
Applications
• Programmable power supply for P54C, P55C, K6, and
M2 based CPU motherboards
• VRM module for Pentium and equivalent CPU’s
• Programmable power supply for high current
microprocessors
Block Diagram
RC5041
OSCILLATOR
–
+
+12V
+5V
VIN
–
+
–
+
–
+
VO
DIGITAL
CONTROL
VREF
4-BIT
DAC
1.24V
REFERENCE
POWER
GOOD
PWRGD
VID0
VID1
VID2
VID3
Pentium is a registered trademark of Intel Corporation.
K6 is a trademark of AMD Corporation.
6x86MX is a trademark of Cyrix Corporation.
65-5041-01
Rev. 0.9.5
PRELIMINARY INFORMATION
describes products that are not in full production at the time of printing. Specifications are based on design goals
and limited characterization. They may change without notice. Contact Raytheon Electronics for current information.
RAYTHEON [ RAYTHEON COMPANY ]
