Microchip | MCP1630RD-NMC1

MCP1630RD-NMC1 Low Cost NiMH Battery Charger Reference Design is used to evaluate Microchip’s MCP1630 in a SEPIC power converter application, it is capable of charging a three series cell NiMH battery pack from an input voltage of 6 V to 14 V.

The Battery Charger Reference Design provides a constant current charge with preconditioning, cell temperature monitoring and battery pack fault monitoring. Also, the charger provides a status or fault indication. The Battery Charger Reference Design automatically detects the insertion or removal of a battery pack.

Features:

• Programmed parameters - modified in firmware
• Factory Settings:
• Preconditioning Charge Current =170 mA
• Preconditioning Threshold = 3 V
• Constant Current Fast Charge = 1.35 A
• Charge Termination based on delta - VBATT / delta time
• Charge Termination based on delta + TBATT / delta time
• Top Off Charge Current = 130 mA for 1 Hour
• Overvoltage protection (battery removed)
• Overcharge protection to prevent damaging the battery
• Overcurrent protection in the event of a shorted battery
• Battery reversal protection
• Input short circuit protection
• Overtemperature protection
• Soft-start capability by holding the reference voltage low during power-up
• Has the flexibility to optimize the charging algorithm for new battery technology
• Proprietary features can be added by modifying the firmware contained in the PIC12F683
• Factory-programmed source code is available
• Ability to adapt to environmental effects, such as ambient temperature