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MAX8743 Datasheet Step-down Controller

Manufacturer: Maxim Integrated (now Analog Devices)

Overview: 19-3318; Rev 1; 8/05 MAX8743 Dual, High-Efficiency, Step-Down Controller with High Impedance in Shutdown.

General Description

The MAX8743 is a dual pulse-width modulation (PWM) controller configured for step-down (buck) topologies that provides the high efficiency, excellent transient response, and high DC output accuracy necessary for stepping down high-voltage batteries to generate lowvoltage chipset and RAM power supplies in notebook computers.

The CS_ inputs can be used with low-side sense resistors to provide accurate current limits or can be connected to LX_, using low-side MOSFETs as current-sense elements.

High output impedance in shutdown eliminates negative output voltages, saving the cost of a Schottky diode at the output.

Key Features

  • Ultra-High Efficiency.
  • Accurate Current-Limit Option.
  • Quick-PWM™ with 100ns Load-Step Response.
  • 1% VOUT Accuracy over Line and Load.
  • High Output Impedance in Shutdown.
  • Dual Mode™ Fixed 1.8V/1.5V/Adj or 2.5V/Adj Outputs.
  • Adjustable 1V to 5.5V Output Range.
  • 2V to 28V Battery Input Range.
  • 200kHz/300kHz/420kHz/540kHz Nominal Switching Frequency.
  • Adjustable Overvoltage Protection.
  • 1.7ms Digital Soft-St.

MAX8743 Distributor & Price

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