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RC5054 Datasheet

  • RC5054

  • Programmable Synchronous DC-DC Converter Controller for Low ...

  • 13頁

  • FAIRCHILD

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RC5054A
Programmable Synchronous DC-DC Converter
Controller for Low Voltage Microprocessors
Features
鈥?Drives Two N-Channel MOSFETs
鈥?Operates from +5V Power Input
鈥?Simple Single-Loop Control Design
- Voltage-Mode PWM Control
鈥?Fast Transient Response
- High-Bandwidth Error Ampli鏗乪r
- Full 0% to 100% Duty Ratio
鈥?Excellent Output Voltage Regulation
鈥?TTL Compatible 5 Bit Digital-to-Analog Output Voltage
Selection
- Wide Range - 1.3V
DC
to 3.5V
DC
- 0.1V Binary Steps from 2.1V
DC
to 3.5V
DC
- 0.05V Binary Steps from 1.3V
DC
to 2.1V
DC
鈥?Power-Good Output Voltage Monitor
鈥?Over-Voltage and Over-Current Fault Monitors
- Does Not Require Extra Current Sensing Element, Uses
MOSFET鈥檚 R
DS(ON)
鈥?Small Converter Size
- Constant Frequency Operation
- 200kHz Free-Running Oscillator Programmable from
50kHz to 1MHz
Applications
鈥?Power Supply for Pentium
廬
, Pentium Pro, PowerPC鈩?/div>
and Alpha鈩?Microprocessors
鈥?High-Power 5V to 3.xV DC-DC Regulators
鈥?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-recti鏗乪d 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 2.1V
DC
to 3.5V
DC
in 0.1V increments and from
1.3V
DC
to 2.1V
DC
in 0.05V steps.
The RC5054A provides simple, single feedback loop, volt-
Block Diagram
VCC
VSEN
110%
+
POWER-ON
RESET (POR)
-
-
PGOOD
90%
+
115%
+
OVER-
VOLTAGE
10碌A(chǔ)
OVP
SOFT-
START
OVER-
CURRENT
4V
SS
BOOT
UGATE
PHASE
VID0
VID1
VID2
VID3
VID4
FB
COMP
GND
RT
OSCILLATOR
D/A
CONVERTER
(DAC)
DACOUT
+
PWM
COMPARATOR
GATE
CONTROL
LOGIC
LGATE
PGND
-
-
+
OCSET
REFERENCE
200碌A(chǔ)
-
+
INHIBIT
PWM
-
ERROR
AMP
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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