LP14040P datasheet(8/13 Pages) LEIDITECH

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condition, typically 5W; the current charge CT cap is also constant, which is 11μA.

Phase 2: when Ids reaches IOCP, LP14040P works in constant current mode.

Connecting a resistor between OCP pin and GND pin to set the constant current threshold IOCP, refer to

equation (2) for OC level setting. Connect OCP pin to GND to set the maximum over current value,

4A; Leave OCP pin float to set the minimum over current value, 1.5A.

)

133.3

set

OCP,

OCP





(2)

ton

VGS

VTH

VGSL

VDS

IDS

ILMT

IPWR

Phase 1

Phase 2

2.4V

µA

Power and Current Limited Soft Startup Sequence

FAULT TIMER

When in power limit or current limit condition, a current ICT_CHG will start to charge the cap on

CT pin.

1. When the voltage on CT pin reaches the upper threshold, the device will shut down, FLTB is

pulled to GND internally, and a current ICT_HIC will start to discharge the cap to low threshold

voltage 0.4V, then charge the CT cap to 2.4V, after 16 times charge and discharge, device will pull

CT to GND and try to start up again.

2. If the voltage on CT pin doesn’t reach the upper voltage, and power limit condition and current

limit condition are dismissed, then CT cap will be discharge to 0V with 20μA discharge current.

This hiccup operation will reduce the system thermal stress and extend the life of battery if it’s in

fault conditions.

LP14040P

Rev :

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