• Output voltage 5 V ± 2%
• 150 mA Output current
• Extreme low current consumption typical 65 μA in ON state
• Inhibit function: Below 1 μA current consumption in off mode
• Early warning
• Reset output low down to VQ = 1 V
• Adjustable reset threshold
• Overtemperature protection
• Reverse polarity proof
• Wide temperature range

Functional Description
 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 μA. 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 μA.

 To achieve proper operation of the μ-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 overtemperature.

Circuit Description
 The TLE 4299 is a PNP based very low drop linear voltage regular. It regulates the output voltage to VQ = 5 V for an input voltage range of 5.5 V ≤ VI ≤ 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 VQ to an internal threshold. If the output
voltage drops below this level, the external reset delay capacitor CD is discharged. When
VD is lower than VLD, the reset output RO is switched Low. If the output voltage drop is
very short, the VLD 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 VUD 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 CD. 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 VSI,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 VSI,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 cause also any other voltage can be observed by this
The user defines the threshold by the resistor-values RSI1 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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Axial Power Schottky rectifier suited for Switch Mode Power Supplies and high frequency DC to
DC converters. Packaged in DO-201AD these devices are intended for use in low voltage, high
frequency inverters, free wheeling, polarity protection and small battery chargers.

1N5820 1N5821 1N5822

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