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| Portable Pentium Dual Phase Power Supply Controller (R) SC1474 POWER MANAGEMENT Description The SC1474 PowerStep IIITM IC is a single chip high-performance Hysteretic PWM controller. With dual integrated SmartTM Drivers, it powers advanced Pentium(R) 4 processors. The SC1474 features extended Intel Mobile Voltage Positioning (IMVP) to increase battery life by reducing the voltage at the processor when it is heavily loaded. It directly supports Intel's SpeedStepTM requirements for even longer battery life. The SC1474 automatically detects performance and battery mode VIDs. In addition, it integrates direct "deeper sleep" mode support. All operating 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 automatically 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 spacesaving TSSOP-38 package. 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 Typical Application Circuit +V_5 +V_IN Smart Driver Power Control Signals Extended IMVP Logic Controller Lo Rcs +VCORE 0.600V-1.75V Up to 40A SC1474 Dual Phase Extended IMVP CONTROLLER VID Multiplexer Smart Driver Lo Rcs VID [4:0] Co +V_3 VID Regulator Controller +V_VID Revision 6, December 2002 1 www.semtech.com |
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