MCP73871-2CAI/ML Microchip Technology, MCP73871-2CAI/ML Datasheet - Page 27

• Manufacturer Part Number: MCP73871-2CAI/ML
• Description: IC USB/AC BATT CHRGR W/PPM 20QFN
• Manufacturer: Microchip Technology

Specifications of MCP73871-2CAI/ML

• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Function: Charge Management
• Voltage - Supply: 4.4 V ~ 6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-VFQFN Exposed Pad
• Input Voltage: 6V
• Battery Charge Voltage: 4.5V
• Charge Current Max: 1A
• Battery Ic Case Style: QFN
• No. Of Pins: 20
• No. Of Series Cells: 1
• Product: Charge Management
• Output Voltage: 4.2 V
• Output Current: 50 mA to 1000 mA
• Operating Supply Voltage: 4.5 V to 6 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MCP73871DM-VPCC - DEMO BOARD FOR MCP73871MCP73871EV - EVALUATION BOARD FOR MCP73871
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

For example, by utilizing a 10 kΩ at 25°C NTC
thermistor with a sensitivity index, β, of 3892, the
charge temperature range can be set to 0°C - 50°C by
placing a 1.54 kΩ resistor in series (R
69.8 kΩ resistor in parallel (R
6.1.1.6
A status output provides information on the state of
charge. The output can be used to illuminate external
LEDs or interface to a host microcontroller. Refer to
Table 5-1
output during a charge cycle.
6.1.1.7
The preferred discharge current for Lithium-Ion cells
should always follow references and guidance from
battery manufacturers. Due to the safety concerns
when
dissipation of linear solutions, the system load when
design with the MCP73871 device is recommended to
be less than 1A or the maximum discharge rate of the
selected Lithium-Ion cell. Whichever is smaller is
recommended.
The idea diode between V
drive a maximum current up to 2A. The built-in thermal
shutdown protection may turn the MCP73871 device
off with high current.
© 2009 Microchip Technology Inc.
using
for a summary of the state of the status
Charge Status Interface
System Load Current
Lithium-Ion
BAT
T2
batteries
and OUT is designed to
) with the thermistor.
and
T1
), and a
power
6.2
For optimum voltage regulation, place the battery pack
as close as possible to the device’s V
recommended to minimize voltage drops along the
high current-carrying PCB traces.
If the PCB layout is used as a heatsink, adding many
vias in the heatsink pad can help conduct more heat to
the backplane of the PCB, thus reducing the maximum
junction temperature.
PCB Layout Issues
MCP73871
DS22090B-page 27
BAT
and V
SS
pins,