MCP73812T-420I/OT

MCP73812T-420I/OT is a linear charge management controller. It provides specific charge algorithms for single-cell Li-Ion or Li-Polymer batteries to achieve optimal capacity in the shortest charging time possible. Along with its small physical size, the low number of external components required makes the device ideally suited for portable applications. It employs a constant current/constant voltage charge algorithm. The constant voltage regulation is fixed at 4.20V, with a tight regulation tolerance of 1%. For the MCP73812, the constant current value is set with one external resistor. It limits the charge current based on die temperature during high power or high ambient conditions. This thermal regulation optimizes the charge cycle time while maintaining device reliability. The application includes low-cost lithium-ion/lithium-polymer battery chargers, rechargeable toys, electronic cigarettes, Bluetooth headsets, and USB chargers.

• Integrated pass transistor, integrated current sense, integrated reverse discharge protection
• Constant current/constant voltage operation with thermal regulation
• 4.20V voltage regulation, no preconditioning, external end-of-charge control
• Automatic power-down when input power removed, active high charge enable
• 1% high accuracy preset voltage regulation
• Supply current is 1000µA typical at (VDD= [VREG(typ.) + 0.3V] to 6V, TA = -40°C to +85°C)
• ON-resistance is 400mohm typical at (VDD = 3.75V, TJ = 105°C)
• Charge impedance range is 20Kohm maximum at (VDD= [VREG(typ.) + 0.3V] to 6V, TA = -40°C to +85°C)
• Supply ripple attenuation is 52dB typical at (IOUT=10mA, 10Hz to 1KHz)
• Operating temperature range from -40°C to +85°C, 5-lead SOT-23 package