Information

20
Portable Power Conversion Design Guide
Battery Management
Linear Battery Chargers
Linear Battery Chargers
In battery-powered systems, the quality of the charging circuit plays a key role in the life and reliability of the battery.
Microchip offers a complete line of linear Li-Ion battery chargers. To further reduce design size, cost and complexity, the Li-Ion
Charge Management Controllers provide a reliable, low-cost and high accuracy voltage regulation solution with few external
components. The MCP73830L Li-Ion linear charger was developed specifically for low-charge current applications. Charge
currents as low as 20 mA can be controlled using a programmable resistor. Single- and two-cell LiFePO4 batteries can be
charged using the MCP738123/213 linear chargers. In order to supply world-class portable devices, most of Microchip’s
Li-Ion/LiFePO4 Battery Management Controllers are equipped with thermal regulation, reverse discharge protection, safety
charge timer and integrated current sensing. The programmable constant charge current can assist you in meeting different
application requirements with a single resistor. Along with their small physical size, the low number of external components
required makes Microchip’s battery management ICs ideally suited for portable applications.
MCP73830 Single Cell, Li-Ion/Li-Polymer Batter Charge Management Controllers
The MCP73830 battery chargers contain a large number of features for creating long life, long run time, fast charging
battery circuits. Including options for battery preconditioning, programmable charge currents, end-of-charge thresholds and
elapse timers, these charging devices maximize fuel capacity and minimize charge time while maintaining battery life in
low-component-count, small-area circuits perfectly suited for portable applications.
Typical Application Circuit for the MCP73830L (Low Current, 20 to 200 mA) and MCP73830 (High Current,
100 mA to 1A) Battery Charger Solutions
■ Complete linear charge management controller
■ High 0.75% accuracy preset voltage regulation
■ Programmable charge current:
• 100 mA to 1A for MCP73830
• 20 mA to 100 mA for MCP73830L
■ Available with or without a preconditioning mode,
which decreases charge current to 10% of the
typical current when the battery voltage is below the
preconditioning threshold
■ Available with or without a fixed 1 hour preconditioning
timer to stop the charge cycle when the battery is not
charging properly
■ Soft start to minimize inrush current
■ Fixed 0 to 4 hour elapse timer
■ Available in options for 7.5% or 10% current thresholds
to trigger automatic end-of-charge termination
■ Chip enable input (CE)
■ Under-voltage lockout (UVLO)
■ Automatic power-down
■ Integrated thermal regulation
■ Wide −40°C to +85°C operating temperature range
■ Available in small footprint 6-pin TDFN
(2 × 2 × 0.75 mm) packages
VDD
VBAT
VSS
Regulated
wall cube
4.7 μF 4.7 μF
STAT
PROG
CE
1 kΩ
LO
HI
1-Cell
Li-Ion
Battery
2 kΩ