RC5042 View Datasheet(PDF) - Fairchild Semiconductor
Part Name
Description
Manufacturer
RC5042 Datasheet PDF : 20 Pages
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RC5042
Programmable DC-DC Converter
www.fairchildsemi.com
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
• Precision trimmed low TC voltage reference
• 16 pin SOIC package
• Meets Intel Pentium® Pro VRM specifications using
minimum number of external components
Applications
• Programmable power supply for Pentium Pro and
Pentium-based CPU motherboards
• VRM module for Pentium Pro CPU
• Programmable power supply for high current
microprocessors
Description
The RC5042 is a non-synchronous DC-DC controller IC
which provides an accurate, programmable output for
Pentium Pro CPU applications. Using an integrated 4-bit
DAC to accept a voltage identification (VID) code directly
from the CPU, the RC5042 can generate precise output volt-
ages between 2.1V and 3.5V in 100mV increments. Output
load currents in excess of 12A can be delivered using mini-
mal external circuitry. The RC5042 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 compo-
nents in order to achieve tight voltage regulation. The Pen-
tium Pro 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 oscillator can be programmed to
operate over a range of 200KHz to 1MHz to allow flexibility
in choosing external components.
Block Diagram
OSCILLATOR
RC5042
–
+
–
+
DIGITAL
CONTROL
+5V
VIN
VO
VREF
VID0
VID1
VID2
VID3
4-BIT
DAC
1.24V
REFERENCE
POWER
GOOD
PWRGD
65-5042-01
Rev. 1.3.1
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