L99MM70XP datasheet(12/68 Pages) STMICROELECTRONICS

12 / 68 page

Description

L99MM70XP

12/68

Doc ID 022637 Rev 2

Description

3.1

Voltage regulator

The L99MM70XP contains a fully protected low drop voltage regulator, which is designed for

very fast transient response.

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

The voltage regulator provides 5 V supply voltage and up to 100 mA continuous load current

for the external digital logic (microcontroller, etc...). In addition the regulator VCC drives the

L99MM70XP internal 5 V 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. 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 > 220 nF.

If device temperature exceeds TSD1 threshold, all outputs (OUTx, LIN) are deactivated

except VCC. Hence the microcontroller has the possibility for interaction or error logging. In

case of exceeding TSD2 threshold (TSD2 > TSD1), also VCC is deactivated (see Figure 8).

A timer is started and the voltage regulator is deactivated for tTSD =1s.

During this time, all other wake-up sources (LIN) are disabled. After 1 s, the voltage

regulator tries to restart automatically. If the restart fails 6 times without clearing and thermal

shutdown condition still exists, the L99MM70XP enters the VBAT-standby mode.

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

L99MM70XP enters the VBAT-standby mode. Reactivation (wake-up) of the device can be

achieved with signals from LIN or INH.

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