MAX8672

PRODUCTION

Complete Backup Management IC for NiMH Batteries

Part Models
2
1ku List Price
Starting From $2.97
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Part Details

  • Charges 1- or 2-Cell NiMH Backup Batteries
  • Programmable Charge Current
  • DC Trickle Charge Mode for Maximum Cell Life
  • Deep-Recovery Charge Restores Cells < 1V
  • Programmable Charge Timer
  • Programmable Charge-Voltage Limit and Battery UVLO
  • Reverse Current Blocking on BATT, LDO, and Boost—No Diodes Needed
  • No Battery Drain When Off (< 50nA)
  • Thermistor Sensing Disables Standard Charge
  • Battery Restart Charge Threshold Prevents Overcharge
MAX8672
Complete Backup Management IC for NiMH Batteries
MAX8672: Typical Operating Circuit
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Hardware Ecosystem

Parts Product Life Cycle Description
Multitopology DC/DC 2
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MAX8660 PRODUCTION High-Efficiency, Low-IQ, PMICs with Dynamic Voltage Management for Mobile Applications
Product 3
MAX8588 High-Efficiency, Low-IQ PMIC with Dynamic Core for PDAs and Smartphones
MAX8568B Complete Backup-Management ICs for Lithium and NiMH Batteries
MAX8568A Complete Backup-Management ICs for Lithium and NiMH Batteries
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Evaluation Kits

MAX8672EVKIT

Evaluation Kit for the MAX8672

Features and Benefits

  • 2.7V to 5.5V Input-Voltage Range
  • Charges One- or Two-Cell NiMH Backup Batteries
  • Programmable Charge Voltage and Current
  • Programmable Undervoltage-Lockout (UVLO) Threshold
  • Programmable Charge Timer
  • Two Backup Output Voltages:
    3.05V (Fixed), 20mA Step-Up DC-DC Converter
    1.75V (Adjustable), 20mA LDO
  • 14-Pin, 3mm x 3mm TDFN Package
  • Lead-Free EV Kit
  • Fully Assembled and Tested
  • Product Details

    The MAX8672 evaluation kit (EV kit) is a fully assembled and tested PCB that evaluates the MAX8672 backup-management IC for NiMH batteries. The MAX8672 EV kit charges one- or two-cell NiMH batteries, with the EV kit configured for two-cell applications. Maximum battery-charge voltage, standard-charge current, and trickle-charge current are preprogrammed to 3V, 3mA, and 450µA, respectively, using external resistors. The programmable charge timer is set to 480 minutes. An adjustable battery undervoltage-lockout (UVLO) threshold is preset to 1.6V and shuts down battery-backup functions.

    To support system-supply voltages, the MAX8672 EV kit provides two outputs. Low-voltage backup cells are stepped up to a fixed 3.05V by a low quiescent-current synchronous-rectified step-up DC-DC converter capable of delivering up to 20mA. A low-dropout (LDO) output is set to 1.75V and is capable of providing up to 20mA. The LDO output voltage is adjustable with external resistors.

    The MAX8672 EV kit also features a thermistor input to monitor battery temperature (negative temperature coefficient (NTC) thermistor not included). To simulate a 100kΩ thermistor at TA = +25°C, the EV kit comes with a 100kΩ resistor installed. See the Thermistor Monitor section for details.

    The MAX8672 EV kit comes fully assembled and tested and has an operating temperature range of -40°C to +85°C.

    Applications

    • PDA, Palmtop, and Wireless Handhelds
    • Smart Cell Phones

    MAX8672EVKIT
    Evaluation Kit for the MAX8672

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