TLE4299G

The TLE 4299 is a monolithic voltage regulator with fixed 5-V output, supplying loads up to 150 mA. It is especially designed for applications that may not be powered down while the motor is off. It only needs a quiescent current of typical 65 A. In addition the TLE 4299 GM includes an inhibit function. When the inhibit signal is removed, the device is switched off and the quiescent current is less than 1 A. To achieve proper operation of the -controller, the device supplies a reset signal. The reset delay time is selected application-specific by an external delay capacitor. The reset threshold is adjustable. An early warning signal supervises the voltage at pin SI. The TLE 4299 is pin-compatible to the TLE 4269 and functional similar with the additional inhibit function. The TLE 4299 is designed to supply microcontroller systems even under automotive environment conditions. Therefore it is protected against overload, short circuit and over temperature.

The TLE 4299 is a PNP based very low drop linear voltage regular. It regulates the output voltage to V_Q = 5 V for an input voltage range of 5.5 V V_I 45 V. The control circuit protects the device against potential caused by damages overcurrent and overtemperature.

The internal control circuit achieves a 5 V output voltage with a tolerance of ± 2%.

The device includes a power on reset and an under voltage reset function with adjustable reset delay time and adjustable reset switching threshold as well as a sense control/early warning function. The device includes an inhibit function to disable it when the ECU is not used for example while the motor is off.

The reset logic compares the output voltage V_Q to an internal threshold. If the output voltage drops below this level, the external reset delay capacitor CD is discharged. When V_D is lower than V_LD, the reset output RO is switched Low. If the output voltage drop is very short, the V_LD level is not reached and no reset-signal is asserted. This feature avoids resets at short negative spikes at the output voltage e.g. caused by load changes.
As soon as the output voltage is more positive than the reset threshold, the delay capacitor is charged with constant current. When the voltage reaches V_UD the reset output RO is set High again.

The reset threshold is either the internal defined VRT voltage (typical 4.6 V) or can be lowered by a voltage level at the RADJ input down to 3.5 V. The reset delay time and the reset reaction time are defined by the external capacitor C_D. The reset function is active down to V_I = 1 V.

In addition to the normal reset function, the device gives an early warning. When the SI voltage drops below V_SI,low, the devices asserts the SI output Low to indicate the logic and theprocessor that this voltage has dropped. The sense function uses a hysteresis:
When the SI-voltage reaches the V_SI,high level, SO is set high again. This feature can be used as early warning function to notice the controller about a battery voltage drop and a possible reset in a short time. Of cause also any other voltage can be observed by this feature.

The user defines the threshold by the resistor-values R_SI1 and R_SI2. For the exact timing and calculation of the reset and sense timing and thresholds, please refer to the application section.