Microchip Technology MCP73871DM-VPCC User Manual
MCP73871 DEMO BOARD WITH
VOLTAGE PROPORTIONAL
CURRENT CONTROL USER’S GUIDE
© 2009 Microchip Technology Inc.
DS51812B-page 11
Chapter 2. Installation and Operation
2.1
INTRODUCTION
The MCP73871 Demo Board with Voltage Proportional Current Control demonstrates
Microchip's standalone linear Li-Ion battery charger with system power path and load
sharing management control solution. The system load is also powered by the Li-Ion
battery when the input power is disconnected. A number of device options allow the
MCP73871 to be utilized in a variety of applications. Please refer to the MCP73871
Data Sheet (DS22090) and/or contact local Microchip supports for additional device
options.
Typical applications for the reference design are in Smart Phones, PDA, Portable
Media Players, MP3 Players, Digital Cameras, Handheld Medical devices, Bluetooth
headsets, Ultra-Mobile PC and Portable Communicators.
Microchip's standalone linear Li-Ion battery charger with system power path and load
sharing management control solution. The system load is also powered by the Li-Ion
battery when the input power is disconnected. A number of device options allow the
MCP73871 to be utilized in a variety of applications. Please refer to the MCP73871
Data Sheet (DS22090) and/or contact local Microchip supports for additional device
options.
Typical applications for the reference design are in Smart Phones, PDA, Portable
Media Players, MP3 Players, Digital Cameras, Handheld Medical devices, Bluetooth
headsets, Ultra-Mobile PC and Portable Communicators.
2.2
FEATURES
The MCP73871 Demo Board with Voltage Proportional Current Control has the
following features:
• Integrated System Load Sharing
• Voltage Proportional Current Control (VPCC) Input voltage: 5.5V with ±0.5V
following features:
• Integrated System Load Sharing
• Voltage Proportional Current Control (VPCC) Input voltage: 5.5V with ±0.5V
tolerance (additional information available in the MCP73871 Data Sheet)
• Input Current Limit Control hardware selected (typical 1650 mA, USB-High
maximum 500 mA, and USB-Low maximum 100 mA)
• Three LEDs to indicate charge status, low battery and power good signal
• Preset Li-Ion battery charge voltage: 4.2V ± 0.5%
• Temperature monitoring is disabled by default, but can be enabled to use with a
• Preset Li-Ion battery charge voltage: 4.2V ± 0.5%
• Temperature monitoring is disabled by default, but can be enabled to use with a
NTC thermister (tied at TP6 and TP7 and removing R6)
• Factory preset 0.1C preconditioning current of deeply depleted cells
• Factory preset Safety Timer with Timer Enable feature (by S1 switch)
• Constant Current/Constant Voltage (CC/CV) charge algorithm
• Resistor programmed maximum charge current (R
• Factory preset Safety Timer with Timer Enable feature (by S1 switch)
• Constant Current/Constant Voltage (CC/CV) charge algorithm
• Resistor programmed maximum charge current (R
PROG1
): 1A
• Resistor programmed termination set point (R
PROG3
): 100 mA
• Automatic Charge Termination
• Automatic Recharge
• Internal Thermal Regulation
• Exposed Pad with extra via underneath for better heat dissipations
• Automatic Recharge
• Internal Thermal Regulation
• Exposed Pad with extra via underneath for better heat dissipations