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SC1471 Datasheet(PDF) 1 Page - Semtech Corporation

Part No. SC1471
Description  Power Supply Controller for Portable Pentium III SpeedStep Processors
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Maker  SEMTECH [Semtech Corporation]
Homepage  http://www.semtech.com
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SC1471 Datasheet(HTML) 1 Page - Semtech Corporation

   
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POWER MANAGEMENT
SC1471
Power Supply Controller for Portable
Pentium® III SpeedStepProcessors
Description
.eatures
Applications
Revision 2, March 2001
The SC1471 PowerStep™ II controller is a high speed,
high performance hysteretic mode PWM controller.
Teamed with the SC1405 Smart Driver™ , it powers ad-
vanced Intel® Pentium® III processors. The SC1471 fea-
tures extended Intel Mobile Voltage Positioning (IMVP) to
increase battery life by reducing the voltage at the pro-
cessor when it is heavily loaded. It directly supports Intel®
SpeedStep™ processors for even longer battery life, in-
cluding IMVP extensions. The SC1471 incorporates di-
rect “deeper sleep” mode support, which eliminates an
external multiplexer in many applications.
A 5-bit DAC, accurate to 0.85%, sets the output voltage
reference and implements the 0.600V to 1.750V range
required by the processor. The hysteretic converter uses
a comparator without an error amplifier, and therefore
provides the fastest possible transient response, while
avoiding the stability issues inherent to classical PWM
controllers.
The SC1471 operates from either 3.3Vdc or 5Vdc Vcc
and also features soft-start, an open-drain power-good
indication with power-good blanking, and an enable in-
put. Programmable current limiting uses a separate com-
parator to protect against overloads and short-circuits.
In addition, it comes in a space-saving TSSOP-24 pack-
age.
K Direct “deeper sleep” mode support
K High-speed hysteretic controller provides high
efficiency over a wide operating load range
K .astest possible transient response
K Inherently stable
K Integrated extended IMVP support
K Programmable core voltage for Pentium® III proces-
sors
K Native Intel® SpeedStep™ support with PWRGD
blanking
K Proportional overvoltage protection
K Overcurrent shutdown after 32 overcurrent pulses
K SC1471A also available for VID controlled “Deeper
Sleep” mode
K Laptop and notebook computers
K High performance microprocessor-based systems
K High efficiency distributed power supplies
Typical Application Circuit
SC1471
Extended IMVP
CONTROLLER
VID [4:0]
SC1405C
Smart
MOSFET
Driver
Lo
+VCC_CPU_CORE
Co
+V_IN
+V_5
0.600V-1.75V
Up to 25A
Extended
IMVP
Logic
PWM
Controller
Power
Control
Signals
Control
Signals
SC1471
Extended IMVP
CONTROLLER
VID [4:0]
SC1405C
Smart
MOSFET
Driver
Lo
+VCC_CPU_CORE
Co
+V_IN
+V_5
0.600V-1.75V
Up to 25A
Extended
IMVP
Logic
PWM
Controller
Power
Control
Signals
Control
Signals


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