LP8733 datasheet(35/86 Pages) TI

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Time

Voltage

VOUTx

300 mV

Time

Current

ILIMx

INT_LDO(LDOx_ILIM_INT)

20 µs

nINT

LDO_STAT(LDOx_STAT)

Resistive

pull-down

Regulator disabled by

digital

Host clearing the interrupt by writing to flags

New startup if

enable is valid

1 ms

INT_LDO(LDOx_SC_INT)

LP8733

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SNVSBK2 – SEPTEMBER 2019

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Figure 21. LDO Regulator Overload Situation

7.3.8.2.2

Thermal Warning

The LP8733xx device includes a protection feature against overtemperature by setting an interrupt for the host

processor. The threshold level of the thermal warning is selected with the TDIE_WARN_LEVEL bit in the

CONFIG register.

If the LP8733xx device temperature increases above the thermal warning level, then the device sets the

TDIE_WARN_INT bit in the INT_TOP_1 register and pulls the nINT pin low. The status of the thermal warning

can be read from the TDIE_WARN_STAT bit in the TOP_STAT register, and the interrupt is cleared by writing 1

to the TDIE_WARN_INT bit. The thermal warning interrupt can be masked by setting the TDIE_WARN_MASK bit

in the TOP_MASK_1 register to 1.

7.3.8.3 Protection (Regulator Disable)

If the regulator is disabled, because of protection or fault (short-circuit protection, overload protection, thermal

shutdown, input overvoltage protection, or UVLO), then the output power FETs are set to high-impedance mode

and the output pulldown resistor is enabled (if enabled with the BUCKx_RDIS_EN bit in the BUCKx_CTRL_1

defined by the output capacitance, load current, and resistance of the integrated pull-down resistor. The pull-

down resistors are active as long as the VANA voltage is above approximately a 1.2-V level.

7.3.8.3.1

Short-Circuit and Overload Protection

A short-circuit protection feature allows the LP8733xx to protect itself and the external components against a

short circuit at the output or against overload during start-up. For the buck and LDO regulators, the fault

thresholds are about 350 mV (buck) and 300 mV (LDO). The protection is triggered and the regulator is disabled

if the output voltage is below the threshold level (1 ms) after the regulator is enabled.

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