LP4067 datasheet(7/8 Pages) POWER

7 / 8 page

LP4067-01

Dec.-2019

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Page 7 of 8

Preliminary Datasheet

LP4067

Battery Temperature Detection

The LP4067T continuously monitors temperature by

measuring the voltage between the TS and GND

pins. A negative or a positive temperature coefficient

thermistor (NTC, PTC) and an external voltage

divider typically develop this voltage. The LP4067T

compares this voltage against its internal VTS-L and

VTS-H thresholds to determine if charging is allowed.

The temperature sensing circuit is immune to any

fluctuation in VIN, since both the external voltage

divider and the internal thresholds (VTS-L and VTS-H)

are referenced to VIN.

The resistor values of R1 and R2 are calculated by

the following equations:

For NTC Thermistors:

(

)

(

)

(

)

(

)

(

)

For PTC Thermistors:

(

)

(

)

(

)

(

)

(

)

K1(VTS-L)=30%, K2(VTS-H)=60%.

Where RTL is the low temperature resistance and RTH

is the high temperature resistance of thermistor, as

specified by the thermistor manufacturer. R1 or R2

can be omitted if only one temperature (low or high)

setting is required. Applying a voltage between the

VTS-L and VTS-H thresholds to pin TS disables the

temperature-sensing feature.

Thermal Limiting

An internal thermal feedback loop reduces the ISET

programmed charge current if the die temperature attempts to

rise above a preset value of approximately 125°C. This

feature protects the LP4067 from excessive temperature and

allows the user to push the limits of the power handling

capability of a given circuit board without risk of damaging the

LP4067. The charge current can be set according to typical

(not worst-case) ambient temperature with the assurance that

the charger will automatically reduce the current in worst-case

conditions.

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