RC5050 Datasheet, PDF (1/20 Pages) List of Unclassifed Manufacturers – Programmable DC-DC Converter for Lo Voltage

Electronics
Semiconductor Division
RC5050
Programmable DC-DC Converter for Low Voltage
Microprocessors
Features
• Programmable output from 1.3V to 3.5V
• 85% efficiency typical
• 1% output accuracy
• Oscillator frequency adjustable from 80KHz to 1MHz
• On-chip Power Good and Enable functions
• Over-Voltage Protection
• Foldback current limiting
• Precision trimmed low TC voltage reference
• 20 pin SOIC package
• Meets Intel Pentium^® II specifications using minimum
number of external components
Applications
• Programmable power supply for Pentium II
• Voltage Regulator Module (VRM) for Pentium II
processors
• Programmable step-down power supply
Description
The RC5050 is a DC-DC controller IC which provides an
accurate, programmable output for all Pentium II CPU appli-
cations. The RC5050 uses a 5-bit D/A converter to program
the output voltage from 1.3V to 3.5V. The RC5050 uses a
high level of integration to deliver load currents in excess of
15A from a 5V source with minimal external circuitry. Non-
synchronous operation allows a low cost solution for most
CPU power supply applications. The internal oscillator can
be programmed from 80KHz to 1MHz for additional flexi-
bility in choosing external components. An on-board preci-
sion low TC reference achieves tight tolerance voltage
regulation without expensive external components. The
RC5050 also offers integrated functions including Power
Good, Output Enable, over-voltage protection and current
limiting.
Block Diagram
OSC
RC5050
–
+
+12V
+5V
–
+
DIGITAL
CONTROL
VO
VREF
5-BIT
DAC
1.24V
REFERENCE
VID0 VID2 VID4
VID1 VID3
ENABLE
POWER
GOOD
PWRGD
Pentium is a registered trademark of Intel Corporation.
65-5050-01
Rev. 1.2.1