Data Sheet

14

Rev. 1.0

2016-08-05

TLE8457

LIN Transceiver with integrated Voltage Regulator

Functional Description

4.3

Voltage Regulator

The TLE8457 has an integrated voltage regulator dedicated for supplying microcontrollers and/or on-board

sensors under harsh automotive environment conditions. It can supply a load current up to 70 mA with an

output voltage tolerance within ± 2%. Because of the ultra low current consumption, the TLE8457 is perfectly

suited for applications permanently connected to the battery supply. Additionally, in Sleep Mode, the voltage

regulator is switched off and an even lower quiescent current can be achieved.

The voltage regulator output is protected against undervoltage, overcurrent, over-temperature and power-up

falling below the undervoltage reset threshold.

multi-layer ceramic capacitors.

4.3.1

VCC Undervoltage Detection

and the TLE8457 will automatically enter Init Mode and start the Initialization Watchdog (see Chapter 4.3.2

and Chapter 4.4).

Figure 11

4.3.2

Reset Output

The NRST output is used for issuing reset pulses to for example an external microcontroller. In case of voltage

regulator undervoltage or over-temperature events the NRST output will go “low” and a mode transition to

Init Mode will be triggered. The NRST output will stay “low” until a complete recovery from the failure and

While the TLE8457 is in Init Mode and NRST is “low” mode transition to Normal Operation Mode is blocked.

can be implemented.

TLE8457_VCC_UNDERVOLTAGE

Init mode

Normal Operation mode (EN = „high“)

Standby mode (EN = „low“)

Normal Operation mode (EN = „high“)

Init mode (EN = „low“)

NRST goes and stays „low“ as long

as

NRST stays „low“ for

additional Reset time

NRST

t

t