Integrated circuit MAXIM MAX1999 MAX1777 MAX1977

Integrated circuit MAXIM MAX1999 MAX1777 MAX1977

Integrated circuit MAX1999 MAX1777 MAX1977, High-Efficiency, Quad Output, Main Power-Supply Controllers for Notebook Computers. dual step-down, switch-mode power-supply (SMPS) controllers generate logic-supply voltages in battery-powered systems. The MAX1999 include two pulse-width modulation (PWM) controllers, adjustable from 2V to 5.5V or fixed at 5V and 3.3V. These devices feature two linear regulators providing 5V and 3.3V always-on outputs

   Features

• No Current-Sense Resistor Needed (MAX1999)
• Accurate Current Sense with Current-Sense Resistor (MAX1777/MAX1977)
• 1.5% Output Voltage Accuracy
• 3.3V and 5V 100mA Bootstrapped Linear Regulators
• Internal Soft-Start and Soft-Stop Output Discharge
• Quick-PWM with 100ns Load Step Response
• 3.3V and 5V Fixed or Adjustable Outputs (Dual Mode™)
• 4.5V to 24V Input Voltage Range
• Ultrasonic Pulse-Skipping Mode (25kHz min)
• Power-Good (PGOOD) Signal
• Overvoltage Protection Enable/Disable

  Aplications

• 3- and 4-Cell Li+ Battery-Powered Devices
• Notebook and Subnotebook Computers
• PDAs and Mobile Communication Devices

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