LP87322BSLASHD datasheet(31/75 Pages) TI1

31 / 75 page

Time

Voltage

VOUTx

300 mV

Time

Current

ILIMx

INT_LDO(LDOx_ILIM_INT)

20Ps

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

1ms

INT_LDO(LDOx_SC_INT)

LP87322B-Q1, LP87322D-Q1, LP87322E-Q1, LP87322F-Q1

www.ti.com

SNVSAC5 – SEPTEMBER 2017

Product Folder Links: LP87322B-Q1 LP87322D-Q1 LP87322E-Q1 LP87322F-Q1

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Figure 17. LDO Regulator Overload Situation

8.3.8.2.2

Thermal Warning

The LP87322B/D/E/F-Q1 device includes a protection feature against overtemperature by setting an interrupt for

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

If the LP87322B/D/E/F-Q1 device temperature increases above thermal warning level the device sets

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

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

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

TOP_MASK_1 register to 1.

8.3.8.3 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), the output power FETs are set to high-impedance mode, and

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

LDOx_RDIS_EN bit in LDOx_CTRL register). The turnoff time of the output voltage is defined by the output

capacitance, load current, and the resistance of the integrated pull-down resistor. The pulldown resistors are

active as long as VANA voltage is above approximately a 1.2-V level.

8.3.8.3.1

Short-Circuit and Overload Protection

A short-circuit protection feature allows the LP87322B/D/E/F-Q1 to protect itself and external components

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

thresholds are about 350 mV (buck) and 300 mV (LDO), and 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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