This is an introduction to the Microchip Single Cell Li-Ion / Li-Polymer Battery Charge Management Controller MCP73113
Welcome to the training module on MCP73113. This training module introduces the MCP’s basic features and its application.
The MCP73113 is a highly integrated Li-Ion battery charge management controller for use in space-limited and cost-sensitive applications. The MCP73113 provides specific charge algorithms for Li-Ion / Li-Polymer batteries to achieve optimal capacity and safety in the shortest charging time possible. Along with its small physical size, the low number of external components makes the MCP73113 ideally suitable for portable applications. The absolute maximum voltage, up to 18V, allows the use of MCP73113 in harsh environments, such as a low cost wall wart.
The MCP73113/4 are highly integrated Li-Ion battery charge management controllers for use in space limited and cost-sensitive applications. Typical applications for the reference design are Smart Phones, PDA, Portable Media Players, MP3 Players, Digital Cameras, Handheld Medical devices, Bluetooth headsets and Portable Communicators.
The MCP73113 employs a constant current / constant voltage charge algorithm. The various charging voltage regulations provide design engineers the flexibility to use this device in different applications. The fast charge, constant current value is set with one external resistor from 130 mA to 1100 mA. The MCP73113 limits the charge current based on die temperature during high power or high ambient conditions. The PROG pin of the MCP73113 also serves as an enable pin. When high impedance is applied, the MCP73113 will be in standby mode.
Due to the low efficiency of linear charging, the most important factors are thermal design and cost, which are a direct function of the input voltage, output current and thermal impedance between the battery charger and the ambient cooling air. A trade-off must be made between the charge current, cost and thermal requirements of the charger.
Microchip Technology's MCP73113, MCP73114 and MCP73213 Lithium-Ion (Li-Ion); and MCP73123, MCP73223 Lithium Iron Phosphate (LiFePO4) Chargers feature Overvoltage Protection (OVP), which prevents overheating and damage to the battery-charger circuit from input-voltage spikes. The chargers also feature high-accuracy voltage regulation and an integrated pass transistor.
The MCP73113/4 device are designed to operate in conjunction with a host microcontroller or in standalone applications. The MCP73113/4 provides the preferred charge algorithm for Lithium-Ion and Lithium-Polymer cells Constant-current followed by Constant-voltage. Demand of fast-discharge rated energy storage sources for Electrical Vehicle (EV), Hybrid Electrical Vehicle (HEV) or portable power tools have driven the commercial development of Lithium Iron Phosphate (LiFePO4) batteries. The traditional LiFePO4 battery systems usually require high voltages or large capacities. However, the nature of its characters, such as longer cycle life than typical Li-Ion (Lithium Iron) batteries, better resistance to thermal runaway and higher output and peak current rating make them ideal candidates to RC (remote control) toys and backup power applications.
The MCP73113 OVP Single-Cell Li-Ion Battery Charger Evaluation Board has the following features: • 6.5V Input Over Voltage Protection • 10% Preconditioning of deeply depleted cells • 32-Minute Preconditioning Timer • 6-Hour Safety Timer • 10% Automatic Charge Termination • 500 mA and 1000 mA Preset Fast Charge Current • Automatic Recharge • Thermal Regulation • One Blue LED indicates charge status • Small DFN packages with Exposed Pad as an additional heat sink. The MCP73113 OVP Single-Cell Li-Ion Battery Charger Evaluation Board is designed with two charging currents. The default value is 500 mA and when PROG pin is tied to ground, the two parallel resistors output 1000 mA charging current to a Li-Ion battery.
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Typical Performance Curves Battery Regulation Voltage (VBAT) vs. Supply Voltage (VDD). Charge Current (IOUT) vs. Programming Resistor (RPROG). Typical Charge Profile (875 mAh Battery)
Parameter Description <ul><li>Under-voltage Lockout (UVLO): </li></ul><ul><li>An internal under-voltage lockout (UVLO) circuit monitors the input voltage and keeps the charger in shutdown mode until the input supply rises above the UVLO threshold. </li></ul><ul><li>The UVLO circuit places the device in shutdown mode if the input supply falls to approximately 150 mV above the battery voltage . </li></ul><ul><li>Overvoltage Protection (OVP): </li></ul><ul><li>An internal overvoltage protection (OVP) circuit monitors the input voltage and keeps the charger in shutdown mode when the input supply rises above the OVP threshold. </li></ul><ul><li>The MCP73113/4 device is operational between UVLO and OVP threshold. The OVP circuit is also recognized as overvoltage lock out (OVLO). </li></ul><ul><li>Battery Detection: </li></ul><ul><li>The MCP73113/4 detects the battery presence with charging of the output capacitor. The charge flow will initiate when the voltage on VBAT is pulled below the VRECHARGE threshold . </li></ul>
MCP73113 Typical Application MCP73113 Charging to Li-Ion Cell MCP73113 Charging to LiFePO4 Cell
Battery Charger Evaluation Board Board Top Assembly
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