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PDF SC1474 Datasheet ( Hoja de datos )

Número de pieza SC1474
Descripción Portable Pentium Dual Phase Power Supply Controller
Fabricantes Semtech Corporation 
Logotipo Semtech Corporation Logotipo



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SC1474 Hoja de datos, Descripción, Manual
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POWER MANAGEMENT
Description
The SC1474 PowerStep III™ IC is a single chip high-per-
formance Hysteretic PWM controller. With dual integrated
Smart™ Drivers, it powers advanced Pentium® 4 pro-
cessors. The SC1474 features extended Intel Mobile Volt-
age Positioning (IMVP) to increase battery life by reduc-
ing the voltage at the processor when it is heavily loaded.
It directly supports Intel’s SpeedStep™ requirements for
even longer battery life. The SC1474 automatically de-
tects performance and battery mode VIDs. In addition, it
integrates direct “deeper sleep” mode support. All op-
erating modes incorporate automatic “power-save” to
prevent negative current flow in the low-side FET during
light loading conditions, saving even more power.
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 so provides
the fastest possible transient response, while avoiding
the stability issues inherent to classical PWM controllers.
The SC1474 incorporates a controller for V_VID and au-
tomatically provides the proper sequencing.
SC1474
Portable Pentium® Dual Phase
Power Supply Controller
Features
‹ IMVP3 compliant single chip solution
‹ High speed Dual phase hysteretic controller
‹ VID programmable output
‹ Dual integrated 2A/4A drivers
‹ Integrated VID regulator controller
‹ Automatic performance/battery mode detection
‹ Dynamic phase current matching
‹ Under-voltage lock out on all Vcc inputs
‹ Over-voltage protection on CORE
‹ Current Limit protection on CORE
‹ Thermal protection
‹ Programmable soft-start
‹ Powergood flag with blanking during VID changes
‹ Automatic powersave at light load
‹ TSSOP-38 package
‹ Industrial temperature range
Applications
‹ Advanced Intel microprocessors
The SC1474 operates from +3.3Vdc Vcca and dual 5V
DC drive inputs. It also features soft-start, an open-drain
PWRGD signal with power-good blanking, and an enable
input. Programmable current limiting latches the SC1474
off after 32 current limit pulses. It comes in a space-
saving TSSOP-38 package.
Typical Application Circuit
+V_5
+V_IN
Power
Control
Signals
VID [4:0]
+V_3
+V_VID
Extended
IMVP
Logic
Smart
Driver
Controller
SC1474
Dual Phase
Extended IMVP
CONTROLLER
Smart
VID Driver
Multiplexer
VID
Regulator
Controller
Lo Rcs
+VCORE
0.600V-1.75V
Up to 40A
Lo Rcs
Co
Revision 6, December 2002
1
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