STPM066S datasheet(16/67 Pages) STMICROELECTRONICS

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4.2.3

LDO

LDO is a low drop out linear regulator with 8 programmable output voltages (5.0 V, 3.3 V, 2.8 V, 2.5 V, 1.8 V, 1.3 V,

1.25 V or 1.2 V) through OTP cell. The input voltage (VSLDO) is compatible with the BUCK output (up to 5.5 V).

The LDO regulator provides the following diagnostic:

•

Programmable Over Current limitation in case of over-load or short to ground.

•

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

•

Over Temperature detection by a local thermal sensor.

LDO Fault management:

•

In case of OV, the power stage is turned off, the fault SPI bit is set and the FAULT pin is asserted. The power

stage is turned on again after a Read & Clear cycle. RESET_B is asserted if enabled by OTP, and it moves

the device to REC state.

•

In case of UV, the SPI bit is set and the FAULT pin is asserted. RESET_B is asserted, according to OTP

reset activation and power up sequence, and moves the device to REC state.

•

If OT occurs, the LDO 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.

4.2.4

VREF

STPM066S includes a 1% precise voltage reference output to supply a system ADC. Output voltage can be

selected via OTP cell (4.1 V, 3.3 V, 2.5 V or 1.8 V).

VREF provides the following diagnostic:

•

Over Current limitation in case of over-load or short to ground.

•

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

VREF Fault management:

•

In case of OV, the power stage is turned off, the fault SPI bit is set and the FAULT pin is asserted. The power

stage is turned on again after a Read & Clear cycle.

•

In case of UV, the fault SPI bit is set and the FAULT pin is asserted.

•

In case of OC on VREF for 4 ms, the SPI register fault bit is set and VREF turns off. The FAULT pin is

asserted. VREF turns on again when OC is removed.

4.2.5

ADC

STPM066S includes an Analog to Digital converter (10 bit SAR) to provide via SPI a digital information on internal

local thermal sensors (divided in Thermal Clusters), VBAT1 and VBAT2.

The voltages are provided sequentially by an analog multiplexer.

There are seven Thermal Clusters: three are dedicated to each regulator (TH3, TH5, TH6), three are spread over

signal part (TH1, TH2, TH4) and one is dedicated to the center of the die (TH7):

•

TH1: Center1 (signal part) Temperature Sensor

•

TH2: Center2 (signal part) Temperature Sensor

•

TH3: BUCK2 Temperature Sensor

•

TH4: Center3 (signal part) Temperature Sensor

•

TH5: BOOST Temperature Sensor (the related regulator is disabled)

•

TH6: LDO Temperature Sensor (the related regulator is disabled)

•

TH7: Center of Die Temperature Sensor

4.2.6

Wake up pin (WKUP)

The WKUP pin has an internal pulldown resistance. The maximum voltage this pin can sustain is limited to 40 V.

A higher voltage compliance level in the application can be achieved by applying an external series resistor

between the WKUP pin and the external wake-up signal.

•

When the device is in STANDBY mode, it can be activated by a voltage above VWAKE_ON threshold, with a

minimum duration of tWAKE_FILTER.

STPM066S

Voltage regulators and features description

DS12976 - Rev 2

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