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SC1474TSTRT Datasheet(PDF) 1 Page - Samtec, Inc |
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SC1474TSTRT Datasheet(HTML) 1 Page - Samtec, Inc |
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1 / 1 page 1 www.semtech.com SC1474 Portable Pentium® Dual Phase Power Supply Controller POWER MANAGEMENT Revision 6, December 2002 Description Features Applications Typical Application Circuit 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 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. 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. Advanced Intel microprocessors SC1474 Dual Phase Extended IMVP CONTROLLER VID [4:0] Lo +VCORE +V_IN +V_5 0.600V-1.75V Up to 40A Extended IMVP Logic Controller Power Control Signals Smart Driver VID Multiplexer Lo Co Smart Driver Rcs Rcs +V_3 +V_VID VID Regulator Controller SC1474 Dual Phase Extended IMVP CONTROLLER VID [4:0] Lo +VCORE +V_IN +V_5 0.600V-1.75V Up to 40A Extended IMVP Logic Controller Power Control Signals Smart Driver VID Multiplexer Lo Co Smart Driver Rcs Rcs +V_3 +V_VID VID Regulator Controller |
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