Tag Archives: Buck

Maxim MAX1636 Low Voltage Step-down controller

 Package MAX1636 is a synchronous buck switch mode power supply controller for laptop CPU’s. Taken from a Apple Clamshell iBook from 2000. Packaged in a 20 pin DIP with 2000 week 35 date code.     Die Photo Die size … Continue reading

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Maxim 785 Power Supply Controller

Another chip from the clamshell iBook from 2000.  Another Maxim power chip, this time it is from the main PCB.   Its a MAX785C which I am pretty sure is a dual (3.3V & 5V) PWM buck regulator for laptop … Continue reading

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Nat Semi LM3485 Buck Controller

The datasheet calls this a Hysteretic PFET Buck Controller.  I had to look up “hysteretic” and even knowing it was related to hysteresis I still don’t fully grasp what it means?!  Whilst I am discussing technical english –  ‘buck’ controller means voltage … Continue reading

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