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RC5052 数据表(PDF) 1 Page - Fairchild Semiconductor

部件名 RC5052
功能描述  High Performance Programmable Synchronous DC-DC Controller for Low Voltage Microprocessors
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制造商  FAIRCHILD [Fairchild Semiconductor]
网页  http://www.fairchildsemi.com
标志 FAIRCHILD - Fairchild Semiconductor

RC5052 数据表(HTML) 1 Page - Fairchild Semiconductor

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www.fairchildsemi.com
Pentium is a registered trademark of Intel Corporation
REV. 1.3.2 8/27/01
Features
• Optimized for 12V main power
• Programmable output from 1.3V to 3.5V using an
integrated 5-bit DAC
• Remote sense
• Active Droop
• 85% efficiency typical at full load
• Integrated Power Good and Enable/Soft Start functions
• Drives N-channel MOSFETs
• Overcurrent protection using MOSFET sensing
• 20 pin SOIC package
• Meets Intel Pentium II & III specifications using
minimum number of external components
• Adjustable deadtime, frequency
• Crowbar protection for overvoltage
Applications
• Power supply for Pentium® II & III
• VRM for Pentium II & III processor
• Telecom line cards
• Routers, switches & hubs
• Programmable step-down power supply
Description
The RC5052 is a synchronous mode DC-DC controller IC,
optimized for 12V main power, which provides a highly accu-
rate, programmable output voltage for all Pentium II & III CPU
applications and other high-performance processors. The
RC5052 features remote voltage sensing, adjustable current
limit, and active droop for optimal converter transient
response. The RC5052 uses a 5-bit D/A converter to program
the output voltage from 1.3V to 3.5V. The RC5052 uses a high
level of integration to deliver load currents in excess of 16A
from a 12V source with minimal external circuitry. Synchro-
nous-mode operation offers optimum efficiency over the
entire specified output voltage range. An on-board precision
low TC reference achieves tight tolerance voltage regulation
without expensive external components, while active droop
permits exact tailoring of voltage for the most demanding load
transients. The RC5052 also offers integrated functions
including Power Good, Output Enable/Soft Start, current
limiting, adjustable frequency, adjustable deadtime and over-
voltage crowbar protection, and is available in a 20 pin SOIC
package.
Block Diagram
2
VID0
GNDP
9
10
8
OVP
7
13
4
11
12
3
-
+
-
+
OSC
1.24V
Reference
Digital
Control
5-Bit
DAC
VID1
VID2
VID3
VID4
20 19181716
+12V
+12V
PWRGD
-
+
ENABLE/SS
VO
GNDA
14
LODRV
HIDRV
VCCP
RS
6
15
1
VCCA
DTA
+5V
5
+
-
Power
Good
Rosc
RC5052
High Performance Programmable Synchronous
DC-DC Controller for Low Voltage Microprocessors


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