TLE4299_07 datasheet(2/25 Pages) INFINEON | Low-Drop Fixed Voltage Regulator

Part No.	TLE4299

Description	Low-Drop Fixed Voltage Regulator

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Manufacturer	INFINEON [Infineon Technologies AG]

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Datasheet

2

Rev. 1.1, 2007-10-17

TLE 4299

Circuit Description

The TLE 4299 is a PNP based very low drop linear voltage regulator. It regulates the

output voltage to

V

Q = 3.3 V for an input voltage range of 4.4 V ≤ VI ≤ 45 V. The control

circuit protects the device against potential damages caused by overcurrent and

overtemperature.

The internal control circuit achieves a 3.3 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

C

D is discharged. When

V

D is lower than VST, the reset output RO is switched Low. If the output voltage drop is

very short, the

V

ST 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

DT the reset

output RO is set High again.

The reset delay time and the reset reaction time are defined by the external capacitor

C

D. The reset function is active down to VI = 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 the

µ-processor 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

µ-controller about a battery voltage drop and

a possible reset in a short time. Of course also any other voltage can be observed by this

feature.

The user defines the threshold by the resistor-values

R

SI1 and RSI2.

For the exact timing and calculation of the reset and sense timing and thresholds, please

refer to the application section.

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