SPSB100 datasheet(18/213 Pages) STMICROELECTRONICS

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Power-good used to signal BUCK power on success (flag is BUCK1_PG_OK bit and IRQ is generated

except if MASK_BUCK1_PG_IRQ is set):

–

If not, after TBUCK1_PG_TO timing, BUCK1 is switched off and flag BUCK1_PG_TIMEOUT is set.

•

Not successful power-good detection generates an IRQ except if MASK_BUCK1_PG_TIMEOUT_IRQ is

set.

•

Configurable over current protection through U-NVM BUCK1_IPEAK (flag is BUCK1_OC bit). BUCK1 is

therefore switched off after timing tbuck1_OC_TO except if MASK_BUCK1_OC_POWER_OFF is set.

•

Overcurrent detection generates an IRQ except if MASK_BUCK1_OC_IRQ is set.

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Warning temperature detection by a local thermal sensor (flag is TW_CL1).

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Warning temperature detection generates an IRQ except if MASK_CL1_TW_IRQ is set.

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Overtemperature detection by a local thermal sensor (flag is TSD_CL1, see also the

Section 4.7: Temperature monitoring) and buck1 is switched off.

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BUCK1 internal regulators detection flag is BUCK1_INT_FAIL and the BUCK1 is switched off.

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Internal fail generates an IRQ except if MASK_BUCK1_IRQ is set

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After a fault detection (UV, OV,OC, FBLOSS, TSD_CL1 or PG timeout), BUCK1 can be re enabled by

setting BUCK1_ENA = 0 followed by BUCK1_ENA = 1.

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BUCK1 feedback (FB1) pin disconnection, flag is BUCK1_FBLOSS and the BUCK1 is switched off.

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FB1 pin disconnection generates an IRQ except if MASK_BUCK1_IRQ is set.

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Overtemperature detection by a central thermal sensor (flag is TSD_CL0, see also the

Section 4.7: Temperature monitoring) and device is executed power down sequence.

In active low power, BUCK1 converter provides the following diagnostics:

•

UV detection to monitor the output voltage (flag is BUCK1_UV). BUCK1 is therefore switched off except if

SPI bit MASK_BUCK1_UV_POWER_OFF is set.

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Undervoltage detection generates an IRQ except if MASK_BUCK1_IRQ is set.

•

OV detection to monitor the output voltage (flag is BUCK1_OV bit) BUCK1 is therefore switched off.

•

Overvoltage detection generates an IRQ except if MASK_BUCK1_IRQ is set.

•

Overcurrent protection (flag is BUCK1_OC bit). BUCK1 is therefore switched off except if

MASK_BUCK1_OC_POWER_OFF is set.

•

Overcurrent detection generates an IRQ except if MASK_BUCK1_OC_IRQ is set.

•

BUCK1 feedback (FB1) pin disconnection, flag is BUCK1_UV and the BUCK1 is switched off.

•

FB1 pin disconnection generates an IRQ except if MASK_BUCK1_IRQ is set.

•

Overtemperature detection by central thermal sensor (flag is TSD_CL0, see also the

Section 4.7: Temperature monitoring) and device is executed power down sequence.

In active and REC-1 states, when BUCK1_REGFAIL_GO_REC is set at 1 in USER-NVM, in case of PG timeout,

OV, UV, INT_FAIL, OC, FBLOSS, or TSD events the device executes a power down sequence, enters in REC-2

state and makes an automatic retry. PG_TIMEOUT, OV, UV, OC, INT_FAIL, FBLOSS or TSD flags are not

blocking to re-enable the BUCK1 after a fail event.

According to a suitably configured output voltage, it can be also used to supply other BUCKs. It is not

recommended to use MASK_BUCK1_OC_POWER_OFF and MASK_BUCK1_UV_POWER_OFF in the same

time.

3.3.2

BUCK2 converter

The BUCK2 converter is the same as the BUCK1.

The BUCK2 regulator is a synchronous converter compatible to battery level, with integrated power mos. Stability

compensation network is external.

Output voltages are programmable via USER-NVM through the bit BUCK2_PU_VALUE.

The switching frequency can be selected either at 400 kHz or 2.4 MHz, by USER-NVM BUCK2_FREQ. To limit

emission in audio bandwidth, refresh frequency can be forced at 25 kHz by USER-NVM bit

BUCK2_REFRESH_FREQ set low (1 kHz when high). The draw back will be an extra consumption in low power

mode.

The spread spectrum feature is configurable by SPI bit BUCK2_SPREAD_ENA (disabled by default).

BUCK2 integrates a low power mode (automatically set by LOW_POWER_SET by SPI) that optimizes its

efficiency in active low power mode. (BUCK2 can be optionally enabled in active low power mode).

SPSB100

Functional description

DS14640 - Rev 2

page 18/213

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