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| Portable IMVP-IV Dual Phase Power Supply Controller POWER MANAGEMENT Description The SC1476 PowerStepTM IV IC is a single chip high-performance hysteretic PWM controller. With its integrated SmartDriverTM, it powers advanced IMVP-IV processors. The SC1476 features extended Intel(R) Mobile Voltage Positioning (IMVP) to increase battery life by reducing the voltage at the processor when it is heavily loaded. It directly supports Intel(R) SpeedStepTM processors for even longer battery life. The SC1476 fully supports Intel's Geyserville-III core voltage specification. It provides direct "deeper sleep" mode and boot voltage support. Automatic "power-save" is present to prevent negative current flow in the low-side FET during light loading conditions, saving even more power. The high side driver initially turns on with a weak drive to reduce ringing, EMI, and capacitive turn-on of the low side. A 6-bit DAC, accurate to 0.85%, sets the output voltage reference and implements the 0.700V to 1.708V range required by the processor. The hysteretic converter uses a comparator without an error amplifier thereby providing the fastest possible transient response while avoiding the stability issues inherent to classical PWM controllers. The DAC is externally slew rate limited to minimize transient currents and audible noise. The SC1476 operates from 3Vdc and 5Vdc and also features soft-start, an open-drain PWRGD signal with powergood blanking, and an enable input. Programmable current limiting shuts down the SC1476 after 32 current limit pulses. In addition, it comes in a space-saving TSSOP-38 package. SC1476 Features IMVP-IV compliant single chip solution High speed hysteretic controller 6 bit VID programmable output Integrated drivers with soft high side turn-on Programmable softstart Programmable boot voltage Programmable DeeperSleep voltage Dynamic phase current matching Under-voltage lockout on VccA Over-voltage protection on CORE Current Limit protection on CORE Thermal protection Powergood flag with blanking during VID or DeeperSleep mode changes Automatic powersave at light load Slew rate limited DAC TSSOP-38 package Applications Notebook and Laptop computers Requests for a complete datasheet and additional product information should be directed to sales@semtech.com Typical Application Circuit +V_5 +V_IN Smart Driver Power Control Signals Extended IMVP Logic PWM Controller Lo Rcs +VCORE 0.600V-1.75V Up to 40A SC1474 Dual Phase Extended IMVP CONTROLLER V I D [[4:0]] VID 5 : 0 +V_3 VID Multiplexer Smart Driver Lo Rcs Co VID Regulator Controller +V_VID Revision 7, December 2002 1 www.semtech.com |
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