Portable IMVP-IV Dual Phase Power Supply Controller

The SC1476 PowerStep IV IC is a single chip high-per- formance hysteretic PWM Controller With its integrated SmartDriver, it powers advanced IMVP-IV processors. The SC1476 features extended Intel Mobile Voltage Po- sitioning (IMVP) to increase battery life by reducing the voltage at the processor when it is heavily loaded. It directly supports Intel SpeedStep processors for even longer battery life. The SC1476 fully supports Intels Geyserville-III core voltage specification. It provides di- rect 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 con- ditions, saving even more power. The high side driver ini- tially turns on with a weak drive to reduce ringing, EMI and capacitive turn-on of the low side. By Semtech Corporation