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MAX1534 - High-Efficiency / Triple-Output / Keep-Alive Power-Supply

General Description

The MAX1534 is a high-efficiency, triple-output power supply for keep-alive (always on) voltage rails.

The 500mA buck regulator with an internal current-limited 0.5Ω PMOS steps down the battery or wall adapter supply rail to a fixed 5V or an adjustable output voltage.

Key Features

  • o One Switching and Two Linear Regulators o Switching Regulator +4.5V to +24V Input Voltage Range Over 95% Efficiency Up to 500mA Output Current Up to 200kHz Switching Frequency Fixed 5V or Adjustable Output Voltage Internal 0.5Ω PMOS Switch 100% Maximum Duty Cycle for Low-Dropout Operation o Two Low-Dropout Linear Regulators Up to 160mA Output Current (Each) 3.3V/Adj Output Voltage for OUT1 1.8V/Adj Output Voltage for OUT2 o ±1.5% Accurate Output Voltage o ±4% Accurate Shutdown for Low Battery.

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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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19-2662; Rev 0; 10/02 High-Efficiency, Triple-Output, Keep-Alive Power Supply for Notebook Computers General Description The MAX1534 is a high-efficiency, triple-output power supply for keep-alive (always on) voltage rails. The 500mA buck regulator with an internal current-limited 0.5Ω PMOS steps down the battery or wall adapter supply rail to a fixed 5V or an adjustable output voltage. Two integrated low-voltage linear regulators follow this output and provide two independent preset output voltages of 3.3V and 1.8V, or adjustable output voltages. The buck regulator utilizes a peak current-limit, pulsefrequency modulation (PFM) architecture for highest light-load efficiency to conserve battery life.