STPM066S datasheet(15/67 Pages) STMICROELECTRONICS

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Monitor of the output voltage by an independent circuit for UV/OV detection: thresholds are set via SPI.

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Monitor of the Power Good thresholds is set via SPI but the information is not available on the bus in active

mode.

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Over Current Protection (with 2 selectable values by OTP) on High Side FET.

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Over Temperature detection by a local thermal sensor.

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PGND_BUCK loss detection. An external schottky diode is necessary to protect the power stage in case of

ground loss.

BUCK fault management:

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If a UV/OV fault occurs then Fault pin is asserted and the corresponding fault bit is set inside the SPI

is possible to enable or disable the reset for all regulators together by OTP. The reset moves the device to

REC state.

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If OT occurs, the power stage is switched OFF with a 16 µs filter time. The output decreases until UV is

detected. The regulator goes in REC state and can restart only when OT flag is reset. The corresponding

SPI bit is set and FAULT pin is asserted.

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The over current limitation is a cycle by cycle protection: when a fault happens, the corresponding fault bit

(Buck_OC_STAT) is set inside the SPI register. This bit is stored and, after 7 consequent detection cycles,

the FAULT pin is asserted. When the current is limited, the voltage is lower than the expected value, but the

regulator is able to operate normally, also with the fault bit stored.

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If PGND_BUCK ground loss occurs, all regulators are turned OFF, FAULT and RESET_B pins are asserted

and the device goes back to REC state. Until the fault is present any tentative of turning on the regulator is

ignored.

If this regulator is disabled and not used, VRBUCK_S and PGND_BUCK pins should be connected to ground.

4.2.2

BOOST

The BOOST regulator is a converter running at 2.4 MHz that provides a nominal voltage of 5 V or 7 V (selected

via OTP). Spread Spectrum on PWM is enabled by default and disabled via SPI; a phase shift of 90° versus

BUCK is internally generated. Soft start time is programmed via SPI. Compensation network is internal.

The BOOST regulator provides the following diagnostic:

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Monitor of the output voltage by an independent circuit for UV/OV detection.

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Monitor of the Power Good: thresholds status provided via SPI bit.

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Over Current Protection.

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Over Temperature detection by a local thermal sensor.

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PGND_BOOST loss detection.

BOOST fault management:

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If a UV/OV fault occurs the FAULT pin is asserted and the fault bit is set in the SPI register, where it can be

read and cleared.

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If OT occurs, the power stage is switched OFF with a 16 µs filter time. The output decreases until UV is

detected. The regulator goes in REC state and can restart only when OT flag is reset. The corresponding

SPI bit is set and FAULT pin is asserted.

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The over current limitation is a cycle by cycle protection operating on internal Boost Low Side peak current.

When a fault happens, the corresponding fault bit (Boost_OC_STAT) is set in the SPI register. The Boost

switch is turned off for the actual cycle and the output voltage is lower than expected. This fault bit is stored

and, after 7 consequent detection cycles, the FAULT pin is asserted. Diagnosis status (fault bit stored)

doesn't affect the Boost behavior, then the normal Boost operation is recovered as soon as the peak-current

returns below the OC threshold.

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If PGND_BOOST ground loss occurs, the BOOST is turned OFF and FAULT pin is asserted. Until the fault is

present and stored any tentative of turning on the regulator is ignored. The BOOST can be turned on again

after the fault removal, and a Read & Clear cycle.

If this regulator is disabled and not used, VRBOOST_S and PGND_BOOST pins should be connected to ground.

STPM066S

Voltage regulators and features description

DS12976 - Rev 2

page 15/67

STPM066S Datasheet(PDF) 15 Page - STMicroelectronics

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