L99DZ120 datasheet(59/162 Pages) STMICROELECTRONICS

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L99DZ120

Application information

161

Application information

4.1

Supply VS, VSREG

VSREG supplies voltage regulators V1 and V2, all internal regulated voltages for analog and

digital functionality, LIN and both P-channel high-side switches OUT15 and OUT_HS.

All other high-sides, Fail Safe block and the charge pump are supplied by VS.

In case the VSREG pin is disconnected, all power outputs connected to VS are automatically

switched off.

4.2

Voltage regulators

The device contains two independent and fully protected low drop voltage regulators

designed for very fast transient response and do not require electrolytic output capacitors

for stability.

The output voltage is stable with ceramic load capacitors >220 nF.

4.2.1

Voltage regulator: V1

The V1 voltage regulator provides 5 V supply voltage and up to 250 mA continuous load

current to supply the system microcontroller. The V1 regulator is embedded in the power

management and fail-safe functionality of the device and operates according to the selected

operating mode. The V1 voltage regulator is supplied by pin VSREG.

In addition, the V1 regulator supplies the devices internal loads. The voltage regulator is

protected against overload and overtemperature. An external reverse current protection has

to be provided by the application circuitry to prevent the input capacitor from being

discharged by negative transients or low input voltage. Current limitation of the regulator

ensures fast charge of external bypass capacitors. The output voltage is stable for ceramic

load capacitors >220 nF.

In case the device temperature exceeds the TSD1 threshold (either cluster or grouped

mode) the V1 regulator remains on. The micro controller has the possibility for interaction or

error logging. If the chip temperature exceeds the TSD2 threshold (TSD2 > TSD1), V1 will

be deactivated and all wakeup sources (LIN, WU and Timer) are disabled. After tTSD, the

voltage regulator will restart automatically. If the restart fails 7 times within one minute the

devices enter the Forced Vbat_standby mode. The status bit

FORCED_SLEEP_TSD2/V1SC (SR1) is set.

4.2.2

Voltage regulator: V2

The voltage regulator V2 is supplied by pin VSREG and can supply additional 5 V loads such

as sensors or potentiometers. The maximum continuous load current is 50 mA. The

regulator is protected against:



Overload



Overtemperature



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



Reverse biasing

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