LP87702 datasheet(38/99 Pages) TI

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Time

Voltage

VOUTx

2.5 V

Time

Current

ILIMx

INT_BOOST(BOOST_ILIM_INT)

nINT

BOOST_STAT(BOOST_STAT)

Resistive

pull-down

Converter disabled

by digital

Host clearing the interrupt by writing to flags

New startup if

enable is valid

1ms

INT_BOOST(BOOST_SC_INT)

VIN

Figure 8-13. Boost Overload Situation

The buck converters have a fixed current limit for negative output peak current (ILIM_NEG). When the negative coil

current increases, it is limited below ILIM_NEG, the converter continues to operate and no interrupt is generated.

The boost converter's negative peak current limit operation is similar and the limit value is 1.4 A (typical).

8.3.10.4.2 Thermal Warning

The LP87702-Q1 device includes a protection feature against over-temperature by setting an interrupt for the

host processor. The thermal warning's threshold level is selected with the TDIE_WARN_LEVEL bit.

If the LP87702-Q1 device temperature increases above the thermal warning level, the device sets the

TDIE_WARN_INT bit and pulls the nINT pin low. The status of the thermal warning can be read from the

TDIE_WARN_STAT bit 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 to 1.

8.3.10.5 Protections Causing Converter Disable

If the converter is disabled because of protection or fault (short-circuit protection, thermal shutdown, overvoltage

protection, or undervoltage lockout), the output power FETs are set to high-impedance mode, and the output

pulldown resistor is enabled (if enabled with BUCKx_RDIS_EN and BOOST_RDIS_EN bits). The turnoff time

of the output voltage is defined by the output capacitance, load current, and the resistance of the integrated

pulldown resistor. The pulldown resistors are active as long as the VANA voltage is above the 1.2-V level

(approximately).

8.3.10.5.1 Short-Circuit and Overload Protection

A short-circuit protection feature allows the LP87702-Q1 to protect itself and external components against short

circuiting at the output or against overloading during start-up. A short-circuit at the buck converter output is

detected during start-up when the output voltage is below 350 mV (typical) 1 ms after the buck converter is

LP87702-Q1

SNVSAL1C – DECEMBER 2017 – REVISED JUNE 2021

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