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Fairchild Semiconductor - Programmable Synchronous DC-DC Converter Controller for Low Voltage Microprocessors

Numéro de référence RC5054A
Description Programmable Synchronous DC-DC Converter Controller for Low Voltage Microprocessors
Fabricant Fairchild Semiconductor 
Logo Fairchild Semiconductor 





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RC5054A fiche technique
www.fairchildsemi.com
RC5054A
Programmable Synchronous DC-DC Converter
Controller for Low Voltage Microprocessors
Features
• Drives Two N-Channel MOSFETs
• Operates from +5V Power Input
• Simple Single-Loop Control Design
- Voltage-Mode PWM Control
• Fast Transient Response
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Ratio
• Excellent Output Voltage Regulation
• TTL Compatible 5 Bit Digital-to-Analog Output Voltage
Selection
- Wide Range - 1.3VDC to 3.5VDC
- 0.1V Binary Steps from 2.1VDC to 3.5VDC
- 0.05V Binary Steps from 1.3VDC to 2.1VDC
• Power-Good Output Voltage Monitor
• Over-Voltage and Over-Current Fault Monitors
- Does Not Require Extra Current Sensing Element, Uses
MOSFET’s RDS(ON)
• Small Converter Size
- Constant Frequency Operation
- 200kHz Free-Running Oscillator Programmable from
50kHz to 1MHz
Applications
• Power Supply for Pentium®, Pentium Pro, PowerPC™
and Alpha™ Microprocessors
• High-Power 5V to 3.xV DC-DC Regulators
• Low-Voltage Distributed Power Supplies
Description
The RC5054A provides complete control and protection for
a DC-DC converter optimized for high-performance micro-
processor applications. It is designed to drive two N-Channel
MOSFETs in a synchronous-rectified buck topology. The
RC5054A integrates all of the control, output adjustment,
monitoring and protection functions into a single package.
The output voltage of the converter is easily adjusted and
precisely regulated. The RC5054A includes a 5-input digital-
to-analog converter (DAC) that adjusts the output voltage
from 2.1VDC to 3.5VDC in 0.1V increments and from
1.3VDC to 2.1VDC in 0.05V steps.
The RC5054A provides simple, single feedback loop, volt-
Block Diagram
VSEN
OCSET
VID0
VID1
VID2
VID3
VID4
FB
COMP
RT
VCC
REFERENCE
D/A
CONVERTER
(DAC)
110%
90%
115%
200µA
+
-
+
-
OVER-
VOLTAGE
+
-
+
- OVER-
CURRENT
4V
POWER-ON
RESET (POR)
SOFT-
START
10µA
DACOUT
+
-
ERROR
AMP
PWM
COMPARATOR
+
-
INHIBIT
PWM
GATE
CONTROL
LOGIC
OSCILLA TOR
PGOOD
OVP
SS
BOOT
UGATE
PHASE
LGATE
PGND
GND
Rev. 1.0.2
Alpha is a trademark of Digital Equipment Corporation. Pentium is a registered trademark of Intel Corporation. PowerPC is a trademark of IBM
Corporation.

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