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MAX1971 - Dual / 180 Out-of-Phase / 1.4MHz / 750mA Step-Down Regulator

General Description

The MAX1970/MAX1971/MAX1972 dual-output currentmode PWM buck regulators operate from 2.6V to 5.5V input and deliver a minimum of 750mA on each output.

The MAX1970 and MAX1972 operate at a fixed 1.4MHz (MAX1971 operates at 700kHz) to reduce output inductor and capacitor size and cost.

Key Features

  • o Current-Mode, 1.4MHz Fixed-Frequency PWM Operation o 180° Out-of-Phase Operation Reduces Input Capacitor o ±1% Output Accuracy Over Load, Line, and Temperature Ranges o 750mA Guaranteed Output Current o 2.6V to 5.5V Input o Power-On Reset Delay of 16.6ms (MAX1970) or 175ms (MAX1971 and MAX1972) o Power-Fail Output (MAX1970 and MAX1972 Only) o Power-On Reset Input (MAX1971 Only) o Operation Outside xDSL Band o Ultra-Compact Design with Smallest External Components o Outputs Adjustable from 0.8V.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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19-2297; Rev 0; 1/02 Dual, 180° Out-of-Phase, 1.4MHz, 750mA StepDown Regulator with POR and RSI/PFO General Description The MAX1970/MAX1971/MAX1972 dual-output currentmode PWM buck regulators operate from 2.6V to 5.5V input and deliver a minimum of 750mA on each output. The MAX1970 and MAX1972 operate at a fixed 1.4MHz (MAX1971 operates at 700kHz) to reduce output inductor and capacitor size and cost. Switching the regulators 180° out-of-phase also reduces the input capacitor size and cost. Ceramic capacitors can be used for input and output. The output voltages are programmable from 1.2V to VIN using external feedback resistors, or can be preset to 1.8V or 3.3V for output 1 and 1.5V or 2.5V for output 2. When one output is higher than 1.