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RC5035M Datasheet

  • RC5035M

  • Current-Mode SMPS Controller

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  • ETC

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Electronics
Semiconductor Division
RC5035
Dual Adjustable Voltage Regulators w/Enable
Features
樓 Combines switching regulator and low dropout linear
regulator in single chip
樓 Each output voltage adjustable from 1.5V to 3.6V
樓 Overvoltage and short circuit protection
樓 Switcher can be con脼gured for 10A loads, linear for 5A
樓 Precision trimmed low TC voltage reference
樓 Small footprint 16 lead SOIC package
樓 脪Constant On-Time脫 oscillator (patent pending)
Description
The RC5035 combines a switch-mode DC-DC converter
with a low-dropout linear regulator. In addition, it integrates
the circuitry required to switch the DC-DC converter output
between 3.5V and a user-selectable voltage from 1.5V to
3.6V as well as an enable function to allow the linear
regulator to be turned off when not required. Using minimal
external components, the RC5035 can be con脼gured to
directly implement the two supply situations required in a
P54/P55 脽exible motherboard application. In one mode, the
DC-DC converter provides the 3.5V VRE level required by
the P54 processor. The linear regulator can provide 3.3V for
peripheral components. The RC5035 can also be con脼gured
to provide a 2.8V CPU core supply from the DC-DC con-
verter and a 3.3V I/O supply from the linear regulator.
With the appropriate external components, the DC-DC
converter can deliver load current as high as 10A and the
linear regulator can provide 5A. The DC-DC converter and
the linear regulator can be set independently using two
external resistors each to any value between 1.5V and 3.6V.
The factory trimmed internal reference achieves tight
tolerance voltage regulation on both outputs. Independent
short circuit protection is also provided.
Applications
樓 Dual 3.3V/2.8V power supply for Intel Pentium P55C and
Cyrix
簍
processors requiring separate voltage planes
樓 Programmable dual power supply for high current loads
Block Diagram
+12V
+5V
Switching Regulator
FEEDBACK
CONTROL
OSCILLATOR
DIGITAL
LOGIC
SUPPLY VOLTAGE
FOR CPU CORE
Linear Regulator
1.5V
REFERENCE
+
鈥?/div>
SUPPLY VOLTAGE
FOR I/O, CHIPSET
RC5035
65-5035-01
Rev. 1.0.0

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