LP28014 datasheet(6/7 Pages) POWER

6 / 7 page

LP28014

LP28014 – 00

Oct.-2018

Email: marketing@lowpowersemi.com

www.lowpowersemi.com

Page 6 of 7

Charge Status Indicator (CHAG & PG)

After application of a 5V source, the input voltage rises above

the UVLO and sleep thresholds (VIN>VBAT+VDT),but is less than

OVP (VIN<VOVP), then the PG turns on and provides a low

impedance path to ground.

CHRG has two different states: strong pull-down (~5mA) and

high impedance. The strong pull-down state indicates that the

LP28014A is in a charge cycle. When the charger is entered

CV mode and Once the charge current has reduced to the

battery full charge current threshold (IBF), the CHRG pin will

become high impedance.

Function

CHRG

Charging

Low

Charge END

High

Function

VIN<UVLO

High

UVLO<VIN<OVP

Low

OVP<VIN

High

Power Dissipation

The conditions that cause the LP28014 to reduce charge

current through thermal feedback can be approximated by

considering the power dissipated in the IC. Nearly all of this

power dissipation is generated by the internal MOSFET

calculated to be approximately:

PD=(VIN-VBAT) • IBAT

where PD is the power dissipated, VIN is the input supply

voltage, VBAT is the battery voltage and IBAT is the charge

current. The approximate ambient temperature at which the

thermal feedback begins to protect the IC is:

TA=125℃-PD • θJA

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