MCP73871 Microchip Technology, MCP73871 Datasheet
MCP73871
Manufacturer Part Number
MCP73871
Description
Stand-Alone System Load Sharing and Li-Ion / Li-Polymer Battery Charge Management Controller
Manufacturer
Microchip Technology
Datasheet
1.MCP73871.pdf
(38 pages)
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Features
• Integrated System Load Sharing and Battery
• Complete Linear Charge Management Controller
• Preset High Accuracy Charge Voltage Options:
• Constant Current / Constant Voltage (CC/CV)
• Maximum 1.8A Total Input Current Control
• Resistor Programmable Fast Charge Current
• Resistor Programmable Termination Set Point
• Selectable USB Input Current Control
• Automatic Recharge
• Automatic End-of-Charge Control
• Safety Timer With Timer Enable/Disable Control
• 0.1C Preconditioning for Deeply Depleted Cells
• Battery Cell Temperature Monitor
• Undervoltage Lockout (UVLO)
• Low Battery Status Indicator (LBO)
• Power-Good Status Indicator (PG)
• Charge Status and Fault Condition Indicators
• Numerous Selectable Options Available for a
• Temperature Range: -40°C to +85°C
• Packaging: 20-Lead QFN (4 mm x 4 mm)
© 2009 Microchip Technology Inc.
Stand-Alone System Load Sharing and Li-Ion / Li-Polymer
Charge Management
- Simultaneously Power the System and
- Voltage Proportional Current Control (VPCC)
- Low-Loss Power-Path Management with
- Integrated Pass Transistors
- Integrated Current Sense
- Integrated Reverse Discharge Protection
- Selectable Input Power Sources: USB Port or
- 4.10V, 4.20V, 4.35V or 4.40V
- ±0.5% Regulation Tolerance
Operation with Thermal Regulation
Control: 50 mA to 1A
- Absolute Maximum: 100 mA (L) / 500 mA (H)
Variety of Applications:
- Refer to Section 1.0 “Electrical
- Refer to the “Product Identification
Charge the Li-Ion Battery
ensures system load has priority over Li-Ion
battery charge current
Ideal Diode Operation
AC-DC Wall Adapter
Characteristics” for Selectable Options”
System” for Standard Options
Battery Charge Management Controller
Applications
• GPSs / Navigators
• PDAs and Smart Phones
• Portable Media Players and MP3 Players
• Digital Cameras
• Bluetooth Headsets
• Portable Medical Devices
• Charge Cradles / Docking Stations
• Toys
Description
The MCP73871 device is a fully integrated linear
solution for system load sharing and Li-Ion / Li-Polymer
battery charge management with ac-dc wall adapter
and USB port power sources selection. It’s also
capable of autonomous power source selection
between input or battery. Along with its small physical
size, the low number of required external components
makes
applications.
The MCP73871 device automatically obtains power for
the system load from a single-cell Li-Ion battery or an
input power source (ac-dc wall adapter or USB port).
The MCP73871 device specifically adheres to the
current drawn limits governed by the USB specification.
With an ac-dc wall adapter providing power to the
system, an external resistor sets the magnitude of 1A
maximum charge current while supports up to 1.8A
total current for system load and battery charge
current.
The MCP73871 device employs a constant current /
constant voltage (CC/CV) charge algorithm with
selectable charge termination point. The constant
voltage regulation is fixed with four available options:
4.10V, 4.20V, 4.35V, or 4.40V to accommodate new,
emerging
MCP73871 device also 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 MCP73871 device includes a low battery indicator,
a power-good indicator and two charge status
indicators that allows for outputs with LEDs or
communication
MCP73871 device is fully specified over the ambient
temperature range of -40°C to +85°C.
MCP73871
the
battery
device
with
charging
ideally
host
microcontrollers.
suited
requirements.
DS22090B-page 1
for
portable
The
The
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