MCP73871-2CCISLASHML datasheet(27/38 Pages) MICROCHIP

27 / 38 page

DS22090B-page 27

MCP73871

For example, by utilizing a 10 k

Ω 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 k

Ω resistor in series (R

T1), and a

69.8 k

Ω resistor in parallel (R

T2) with the thermistor.

6.1.1.6

Charge Status Interface

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 for a summary of the state of the status

output during a charge cycle.

6.1.1.7

System Load Current

The preferred discharge current for Lithium-Ion cells

should always follow references and guidance from

battery manufacturers. Due to the safety concerns

when

using

Lithium-Ion

batteries

and

power

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 VBAT and OUT is designed to

drive a maximum current up to 2A. The built-in thermal

shutdown protection may turn the MCP73871 device

off with high current.

6.2

PCB Layout Issues

For optimum voltage regulation, place the battery pack

as close as possible to the device’s VBAT and VSS pins,

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.

MCP73871-2CCI/ML Datasheet(PDF) 27 Page - Microchip Technology

MCP73871-2CCI/ML Datasheet(HTML) 27 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38

Datasheet Download

Link URL