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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.

Features

? 4.5V to 28V Input Voltage Range

? 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

? Two (MAX1964)/Four (MAX1965) Analog Gain

?? Blocks:

?? Positive Analog Blocks Drive Low-Cost PNP

?? Pass Transistors to Build Positive Linear

?? Regulators

?? Negative Analog Block (MAX1965) Drives a

?? Low-Cost NPN Pass Transistor to Build a

?? Negative Linear Regulator

? Power-Good Indicator

? Voltage Sequencing (MAX1964) or Tracking

?? (MAX1965)

Applications

?? xDSL, Cable, and ISDN Modems

?? Set-Top Boxes

?? Wireless Local Loop