L9952XP datasheet(11/68 Pages) STMICROELECTRONICS

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L9952GXP

Description

Doc ID 13518 Rev 5

11/68

Description

2.1

Voltage regulator

The L9952GXP contains 2 independent and fully protected low drop voltage regulators,

which are designed for very fast transient response.

The output voltage is stable with loads capacitors > 220nF.

2.1.1

Voltage regulator: V1

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

current for the external digital logic (micro controller, CAN transceiver ...). In addition the

regulator V1 drives the L9952GXP internal 5V loads. The voltage regulator is protected

against overload and over-temperature. An external reverse current protection has to be

provided by the application circuitry to prevent the output capacitor from being discharged

by negative transients or low input voltage. The output voltage precision is better than +/-2%

(incl. temperature drift and line-/load regulation) for operating mode; respectively +/-3%

during low current mode. Current limitation of the regulator ensures fast charge of external

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

If device Temperature exceeds TSD1 threshold, all outputs (Hsx, Lsx, V2, LIN) will be

deactivated except V1. Hence the micro controller has the possibility for interaction or error

logging. In case of exceeding TSD2 threshold (TSD2>TSD1), also V1 will be deactivated

(see state chart Fig. 3.1: “Protection and diagnosis”). A timer is started and the voltage

regulator is deactivated for tTSD = 1sec. During this time, all other wakeup sources (CAN,

LIN, and WU1...4) are disabled. After 1 sec, the voltage regulator will try to restart

automatically. If TSD2 occurs within one minute and for 8 consecutive times, the L9952GXP

enters the VBAT - standby mode.

In case of short to GND at “V1” after initial turn on (V1 < 2V for at least 4ms) the L9952GXP

enters the VBAT - standby mode. Reactivation (wake-up) of the device can be achieved with

signals from CAN, LIN, WU1..4, SPI.

2.1.2

Voltage regulator: V2

The voltage regulator V2 supplies additional 5V loads (e.g. Logic components, external

sensors, external potentiometers). The continuous load current is 50mA. The regulator

provides accuracy better than + 3% @ 50mA (4% @ 100mA) load current.

In case of short to GND at “V2” after initial turn on (V2 < 2V for at least 4ms) the V2

regulator is switched off. Micro processor has to send a clear command to reactivate the V2

regulator.

V2 is protected against:

●

Overload

●

Over temperature

●

Short circuit (short to ground and battery supply voltage)

●

Reverse biasing

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