L99PM60J datasheet(10/75 Pages) STMICROELECTRONICS

10 / 75 page

Detailed description

L99PM60J

10/75

Doc ID 18309 Rev 6

Detailed description

2.1

Voltage regulator

The L99PM60J contains a fully protected low drop voltage regulator, which is designed for

very fast transient response. The output voltage is stable with loads capacitors > 220 nF

The V1 voltage regulator provides 5 V supply voltage and up to 100 mA continuous load

current and is mainly intended for supply of the system microcontroller. The V1 regulator is

embedded in the power management and failsafe functionality of the device and operates

according to the selected operating mode.

In addition the regulator V1 drives the L99PM60J 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. 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, RELx, LIN) are

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 is deactivated (see

state chart Figure 11). A timer is started and the voltage regulator is deactivated for tTSD.

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

regulator tries to restart automatically. If the restart fails 7 times without clearing and thermal

shutdown condition still exists, the L99PM60J enters the VBAT-standby mode.

In case of short to GND at “V1” after initial turn on (V1 < V1fail for t > tv1short) the L99PM60J

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

signals from LIN.

2.1.1

Voltage regulator failure

The V1, regulator output voltage is monitored.

In case of a drop below the V1 – fail thresholds (V1 < V1fail for t > tV1fail), the V1 -fail bit is

latched. The fail bits can be cleared by a dedicated SPI command.

Short to ground detection

At power-on, in case of short detection on V1, the regulator output switches off after tV1short

and the L99PM60J turns to forced VBAT-standby mode. The forced VBAT TSD2/SHTV1 and

V1fail lists are set.

During Normal mode, once the regulator exceeded the V1fail threshold, in case of short

detection on V1, the device turns to force VBAT-standby mode only after thermal shutdown

TSD2 detection. In this case the forced VBAT TSD2/SHTV1 bit is set.

V1 undervoltage warning

For the L99PM60J 2 different V1 reset thresholds can be selected. The higher threshold

VRT2 is set by default. If the lower threshold is selected the V1 undervoltage warning flag is

set, if the voltage on V1 output drops below the higher threshold. This Bit is latched and can

be read and optionally cleared.

L99PM60J Datasheet(PDF) 10 Page - STMicroelectronics

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