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RC5052M Datasheet

  • RC5052M

  • Current-Mode SMPS Controller

  • 18頁

  • ETC

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www.fairchildsemi.com
RC5052
High Performance Programmable Synchronous
DC-DC Controller for Low Voltage Microprocessors
Features
鈥?Optimized for 12V main power
鈥?Programmable output from 1.3V to 3.5V using an
integrated 5-bit DAC
鈥?Remote sense
鈥?Active Droop
鈥?85% ef鏗乧iency typical at full load
鈥?Integrated Power Good and Enable/Soft Start functions
鈥?Drives N-channel MOSFETs
鈥?Overcurrent protection using MOSFET sensing
鈥?20 pin SOIC package
鈥?Meets Intel Pentium II & III speci鏗乧ations using
minimum number of external components
鈥?Adjustable deadtime, frequency
鈥?Crowbar protection for overvoltage
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 ef鏗乧iency over the
entire speci鏗乪d 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.
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Power supply for Pentium
廬
II & III
VRM for Pentium II & III processor
Telecom line cards
Routers, switches & hubs
Programmable step-down power supply
Block Diagram
+5V
DTA
15
Rosc 1
VCCA 6
-
+
4 R
S
13
5
11 VCCP
12 HIDRV
+12V
OSC
-
+
Digital
Control
-
+
-
+
+12V
10
9 LODRV
8
GNDP
Power
Good
3
PWRGD
VO
5-Bit
DAC
20 19181716
1.24V
Reference
14
GNDA
2
ENABLE/SS
VID0 VID2 VID4
VID1 VID3
7
OVP
Pentium is a registered trademark of Intel Corporation
REV. 1.3.2 8/27/01

RC5052M 產(chǎn)品屬性

  • Fairchild Semiconductor

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