MICROCHIP MCP73123-22SI/MF

Highly integrated LiFePO4 battery charge management controller for space-limited, cost-sensitive applications. Provides a dedicated charging algorithm for LiFePO4 batteries to achieve optimal capacity and safety in minimal charge time. In addition to its small physical footprint, the minimal external component count makes it well suited for a wide range of applications. An absolute maximum voltage rating of up to 18V enables operation in harsh environments such as high-voltage transients caused by low-cost wall adapters or hot-plug events.

Employs a constant-current/constant-voltage charging algorithm. The factory-preset precharge threshold reference voltage is 2V per cell at 3.6V. For fast charging, the constant-current value is set between 130mA and 1100mA via a single external resistor. Under high-power or high-ambient-temperature conditions, the charging current is limited based on die temperature. Thermal regulation optimizes the charge cycle while maintaining device stability.

The PROG pin also functions as an enable pin. When set to high impedance, the device enters standby mode. The device operates over an ambient temperature range of -40°C to +85°C. Available in a 10-pin DFN package.

• Complete linear charge management controller
• Integrated input overvoltage protection
• Integrated pass transistor
• Integrated current sensing
• Integrated reverse discharge protection
• Constant current/constant voltage operation with thermal regulation
• 4.15V UVLO
• 18V absolute maximum input with OVP:
  • 6.5V - MCP73123
  • 13V - MCP73223
• High-accuracy preset voltage regulation across full temperature range (-5°C to +55°C):
  • ±0.5% - MCP73123
  • ±0.6% - MCP73223
• Battery charge voltage options:
  • 3.6V - MCP73123
  • 7.2V - MCP73223
• Resistor-programmable fast charge current: 130mA - 1100mA
• Preconditioning for deeply discharged batteries, selectable: 10% or disabled
• Integrated precharge timer: 32 minutes or disabled
• Automatic charge termination control, selectable minimum current ratio: 5%, 7.5%, 10%, or 20%
• Charge time safety timer: 4 hours, 6 hours, 8 hours, or disabled
• Automatic recharge, selectable: 95% or disabled
• Factory-preset charge status output: on/off or blinking
• Soft-start
• Temperature range: -40°C to +85°C
• Package: 10-pin DFN (3mm×3mm)

• Low-cost LiFePO4 battery charger
• Power tools
• Toys
• Backup energy storage devices