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MAX1964 Datasheet Tracking/Sequencing Triple/Quintuple Power-Supply Controllers

Manufacturer: Maxim Integrated (now Analog Devices)

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General Description

The MAX1964/MAX1965 power-supply controllers are designed to address cost-sensitive applications demanding voltage sequencing/tracking, such as cable modem consumer premise equipment (CPE), xDSL CPE, and set-top boxes.

Operating off a low-cost, unregulated DC supply (such as a wall adapter output), the MAX1964 generates three positive outputs and the MAX1965 generates four positive outputs and one negative output to provide an inexpensive system power supply.

The MAX1964 includes a current-mode synchronous step-down controller and two positive regulator gain blocks.

Overview

19-2084; Rev 0; 7/01 Tracking/Sequencing Triple/Quintuple Power-Supply.

Key Features

  • voltage sequencing and the MAX1965 features voltage tracking. Both controllers provide a powergood output that monitors all of the output voltages. o 4.5V to 28V Input Voltage Range o Master DC-DC Step-Down Converter: Preset 3.3V or Adjustable (1.236V to 0.75 x VIN) Output Voltage Fixed Frequency (200kHz) PWM Controller No Current-Sense Resistor Adjustable Current Limit 95% Efficient Soft-Start o Two (MAX1964)/Four (MAX1965) Analog Gain Blocks: Positive Analog Blocks Drive Low-Cost PNP Pass Tran.

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