TLE4268 ,Voltage RegulatorFeatures• Output voltage tolerance ≤ ± 2% Very low current consumption Low-drop voltage Watchdo ..
TLE4268 G , 5-V Low-Drop Fixed Voltage Regulator
TLE4268G , 5-V Low-Drop Fixed Voltage Regulator
TLE4268G , 5-V Low-Drop Fixed Voltage Regulator
TLE4268G , 5-V Low-Drop Fixed Voltage Regulator
TLE4268G , 5-V Low-Drop Fixed Voltage Regulator
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TLE4268
Voltage Regulator
5-V Low-Drop Fixed Voltage Regulator TLE 4268
FeaturesOutput voltage tolerance ≤ ± 2%Very low current consumptionLow-drop voltageWatchdogSettable reset thresholdOvertemperature protectionReverse polarity protectionShort-circuit proofSuitable for use in automotive electronicsWide temperature range
Functional DescriptionThis device is a 5-V low-drop fixed-voltage regulator. The maximum input voltage isV. It can deliver an output current of at least 180 mA. The IC is short-circuit proof and
features temperature protection that disables the circuit in the event of impermissibly
high temperatures. The watchdog function is disabled as a function of the load, so that
a controller is not interrupted during sleep mode by a watchdog reset.
Application DescriptionThe IC regulates an input voltage VI in the range 5.5V < VI < 45V to VQ,nom=5.0V. In
the event of an output voltage VQ < VRT, a reset signal is generated. The wiring of the
reset switching threshold input enables the value of VRT to be reduced. The reset delay
time can be adjusted using an external capacitor. The integrated watchdog monitors the
connected active controller. If there is no rising edge at the watchdog input, the reset
output is set to low. The reset delay capacitor provides a wide adjustment range for the
pulse repetition time. The watchdog function is only activated if the load exceeds 8mA.
This ensures that a microcontroller is not activated during power-down and the current
drain is not increased. The IC is protected against overload and overtemperature.
Figure1Pin Configuration (top view)
Pin Definitions and Functions
Figure2Pin Configuration (top view) (cont’d)
Pin Definitions and Functions
Circuit DescriptionThe control amplifier compares a reference voltage, which is kept highly accurate by
resistance adjustment, to a voltage that is proportional to the output voltage and drives
the base of the series transistor via a buffer. Saturation control as a function of the load
current prevents any over-saturation of the power element. If the externally scaled down
output voltage at the reset threshold input drops below 1.35V, the external reset delay
capacitor is discharged by the reset generator. If the voltage on the capacitor reaches
the lower threshold VDRL, a reset signal is generated on the reset output and not
cancelled again until the upper threshold voltage is exceeded. If the reset threshold input
is connected to GND, reset is triggered at an output voltage of 4.5 V. A connected
microcontroller is monitored by the watchdog logic. If pulses are missing, the rest output
is set to low. The pulse sequence time can be set within a wide range with the reset delay
capacitor. The IC also incorporates internal circuits for protection against:OverloadOvertemperatureReverse polarity
Figure3Block Diagram TLE 4268 G
Absolute Maximum Ratings
Input I
Reset Output RO
Reset Delay D
Watchdog W
Reset Switching Threshold RADJ
Output Q
Ground GND
Temperatures
Operating RangeOptimum reliability and life time are guaranteed if the junction temperature does not
exceed 125°C in operating mode. Operation at up to the maximum junction temperature
of 150°C is possible in principle. Note, however, operation at the maximum permitted
ratings could affect the reliability of the device.
Thermal ResistancePackage mounted on PCB 80×80×1.5mm3; 35μ Cu; 5μ Sn; Footprint only; zero airflow.Measured to pin 2.Measured to pin 5.
Characteristics =13.5 V; – 40°C≤Tj≤125°C (unless otherwise specified)Drop voltage=VI–VQ (measured when the output voltage has dropped 100 mV from the nominal value
obtained at 13.5 V input)
Note:The reset output is low in range from VQ = 1V to VQ,rt.
Reset Generator
Watchdog
Characteristics (cont’d)=13.5 V; – 40°C≤Tj≤125°C (unless otherwise specified)
