MAX17085B

PRODUCTION

Integrated Charger, Dual Main Step-Down Controllers, and Dual LDO Regulators

All-in-One IC Solution Combines Battery Charger and System Power

Data Sheet (Rev. 2) Product Selection Table
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Overview

  • All-in-One Charger Plus Dual Main Step-Down Controllers
  • 5V/100mA and 3.3V/50mA LDO Regulators
  • Main
    • Dual Quick-PWM with Fast Transient Response and Extended On-Time
    • 300kHz to 800kHz Switching Frequency
    • Fixed 5V and 3.3V SMPS Outputs
    • Low-Noise Ultrasonic Mode
    • Autoretry Fault Protection
  • Charger
    • High Switching Frequency (1.4MHz)
    • Selectable 2-, 3-, and 4-Cell Battery Voltage
    • Automatic Selection of System Power Source
    • Internal Charge-Pump for Adapter n-channel MOSFETs Drive
    • ±0.4% Accurate Charge Voltage
    • ±2.5% Accurate Input Current Limiting
    • ±3% Accurate Charge Current
  • Monitor Outputs for
    • AC Adapter Current (±2% Accuracy)
    • Battery Discharge Current (±2% Accuracy)
    • AC Adapter OK
  • Analog/PWM (100Hz to 500kHz) Adjustable Charge Current Setting
  • AC Adapter Overvoltage and Overcurrent Protection
MAX17085B
Integrated Charger, Dual Main Step-Down Controllers, and Dual LDO Regulators
MAX17085B: Functional Diagram
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Documentation

Data Sheet 1

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Evaluation Kits

MAX17085BEVKIT

Evaluation Kit for the MAX17085B

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Features and Benefits

  • Analog Control Charge Current, Voltage, and Input Source Current
  • Monitor Outputs
    • AC Adapter Current/Battery Discharge Current
    • AC Adapter Presence
    • Valid Step-Down Converter Output Voltages
  • 5V, Up to 8A Step-Down Converter Outputs
  • 3.3V, Up to 8A Step-Down Converter Outputs
  • 5V, 3.3V Linear Regulator Outputs
  • Automatic Power-Source Selection
  • Up to 17.5V (4-Cell) Battery Voltage
  • 8V to 22V Input Operation
  • 4A Input Current Limit
  • System Short-Circuit Protection
  • Cycle-by-Cycle Current Limit
  • Up to 1.4MHz Frequency Operation (Charger)
  • Multichemistry Battery Charger
  • Fully Assembled and Tested

Product Details

The MAX17085B evaluation kit (EV kit) is a complete and fully assembled and tested PCB that features the MAX17085B IC, a highly integrated, multichemistry battery-charger controller with dual step-down converters and dual LDOs. The EV kit is capable of supplying power to a system load while simultaneously charging multichemistry battery packs. During operation, the EV kit circuit automatically selects the ADAPTER input or the battery as the main power source for supplying power to the system load and step-down converters. Whenever the EV kit circuit current limit is exceeded, the battery-charge current is reduced automatically, giving priority to the system load and converters.

The EV kit's input source-current limit, battery-charge voltage, maximum battery-charge current threshold, and output current limit on the step-down converters are configurable. These thresholds are adjusted by using on-board circuitry, or by connecting analog signals to the EV kit. Digital output signals indicate the presence of a valid ADAPTER and valid step-down converter voltages. An analog output signal indicates the total current drawn from either the adapter or the battery.

Applications

  • 2-to-4, Li+-Cell, Battery-Powered Devices
  • 5V and 3.3V Supplies
  • Notebook Computers
  • PDAs and Mobile Communicators
MAX17085BEVKIT
Evaluation Kit for the MAX17085B

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