sc1471 Semtech Corporation, sc1471 Datasheet
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sc1471
Manufacturer Part Number
sc1471
Description
Power Supply Controller For Portable Pentium Iii Speedstep? Processors
Manufacturer
Semtech Corporation
Datasheet
1.SC1471.pdf
(1 pages)
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
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.
Revision: June 29, 2004
Description
Typical Application Circuit
POWER MANAGEMENT
®
Pentium
Power
Power
Control
Control
Signals
Signals
VID [4:0]
VID [4:0]
Control
Control
Signals
Signals
+V_5
+V_5
®
III processors. The SC1471 fea-
Extended
Extended
IMVP
IMVP
Logic
Logic
Extended IMVP
Extended IMVP
CONTROLLER
CONTROLLER
SC1471
SC1471
PWM
PWM
Controller
Controller
Power Supply Controller for Portable
Pentium
®
SC1405C
SC1405C
Smart
Smart
MOSFET
MOSFET
Driver
Driver
1
Features
Applications
Direct “deeper sleep” mode support
High-speed hysteretic controller provides high
efficiency over a wide operating load range
Fastest possible transient response
Inherently stable
Integrated extended IMVP support
Programmable core voltage for Pentium
sors
Native Intel
blanking
Proportional overvoltage protection
Overcurrent shutdown after 32 overcurrent pulses
SC1471A also available for VID controlled “Deeper
Sleep” mode
Laptop and notebook computers
High performance microprocessor-based systems
High efficiency distributed power supplies
®
III SpeedStep
®
Lo
Lo
SpeedStep™ support with PWRGD
Co
Co
+VCC_CPU_CORE
+VCC_CPU_CORE
0.600V-1.75V
0.600V-1.75V
Up to 25A
Up to 25A
™
+V_IN
+V_IN
Processors
www.semtech.com
SC1471
®
III proces-