SPSB0813 datasheet(13/135 Pages) STMICROELECTRONICS

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3.2.2

Voltage regulator: V2

The SPSB081 embeds one 5 V or 3V3 (configurable by V2_RAIL bit in CR2) low dropout tracking regulator

designed to provide an output voltage that closely tracks (±20 mV) the V1 reference input while delivering on the

V2 output pin up to 100 mA. The voltage regulator V2 can be configured by means of the V2_TKR bit in CR2 as a

linear independent LDO (V2_TKR=0, default) or as a tracker of the V1 voltage regulator (V2_TKR=1).

The V2 can be configured as tracker of the V1 only at the same voltage output level 5 V for SPSB0815 and

SPSB081C5 (Conf #4 in Table 6) and 3.3 V for the SPSB0813 and SPSB081C3 (Conf #1 in Table 6). The tracking

regulator is protected against:

•

overload

•

overtemperature

•

short-circuit (short to ground and battery supply voltage)

•

reverse biasing

3.2.3

Voltage regulator failure

The V1 and V2 regulators output voltages are monitored.

In case of a drop below the V1, V2 fail thresholds (V1,2 < V1,2fail, for t > tV1,2fail), the failure bits V1FAIL, V2FAIL

(SR 2) are latched. The fail bits can be cleared by a dedicated SPI command.

3.2.4

Short to ground detection

At turn-on of the V1 and V2 regulators, a short to GND condition is detected by monitoring the regulator output

voltage.

If V1 or V2 is below the V1fail,(V2fail) thresholds for t>tv1short (t>tV2short) after turn-on, the SPSB081 will identify a

short-circuit condition at the related regulator output and the regulator will be switched off.

In case of V1 short to GND the device enters VBAT_standby mode automatically.

Bits FORCED_SLEEP_TSD2/V1SC (SR1) and V1FAIL (SR2) are set.

In case of a V2 short to GND failure the V2SC (SR2) and V2FAIL (SR2) bits are set.

Once the output voltage of the corresponding regulator exceeds the V1fail (V2fail) thresholds the short-to-ground

detection is disabled. In case of a short-to-ground condition, the regulator is switched off due to thermal

shutdown.

SPSB081

Voltage regulators

DS14048 - Rev 1

page 13/135

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