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TLE4267SIEN/a550avaiVoltage Regulator


TLE4267 ,Voltage RegulatorFunctional DescriptionTLE 4267 is a 5-V low-drop voltage regulator forP-DSO-14-8automotive
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TLE4267
Voltage Regulator
5-V Low-Drop Voltage Regulator
Bipolar IC
Features
Output voltage tolerance ��� 2 %400mA output current capabilityLow-drop voltageVery low standby current consumptionInput voltage up to 40 VOvervoltage protection up to 60 V (� 400 ms)Reset function down to 1 V output voltageESD protection up to 2000 VAdjustable reset timeOn/off logicOvertemperature protectionReverse polarity protectionShort-circuit proofWide temperature rangeSuitable for use in automotive electronics
Functional Description

TLE 4267 is a 5-V low-drop voltage regulator for
automotive applications in the TO220-7 or DSO-14
package. It supplies an output current of >400mA. The
IC is shortcircuit-proof and has an overtemperature
protection circuit.


TLE 4267
Application
The IC regulates an input voltage VI in the range of 5.5Vvoltage of VQ=5.0V.A reset signal is generated for an output voltage of VQ(typ.4.5V). The reset delay can be set with an external capacitor.The device has two
logic inputs. A voltage of VE2>4.0V given to the E2-pin (e.g. by ignition) turns the device
on. Depending on the voltage on pin E6 the IC may be hold in active-state even if VE2
goes to low level. This makes it simple to implement a self-holding circuit without external
components. When the device is turnedoff, the output voltage drops to 0 V and current
consumption tends towards 0�A.
Design Notes for External Components

The input capacitor CI is necessary for compensation of line influences. The resonant
circuit consisting of lead inductance and input capacitance can be damped by a resistor
of approx. 1� in series with CI. The output capacitor is necessary for the stability of the
regulating circuit. Stability is guaranteed at values of �22�F and an ESR of �3� within
the operating temperature range.
Circuit Description

The 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-saturating of the power element.
The reset output RO is in high-state if the voltage on the delay capacitor CD is greater or
equal VUD. The delay capacitance CD is charged with the current ID for output voltages
greater than the reset threshold VRT. If the output voltage gets lower than VRT a fast
discharge of the delay capacitor CD sets in and as soon as VCD gets lower than VLD the
reset output RO is set to low-level (see Figure6). The reset delay can be set within wide
range by dimensioning the capacitance of the external capacitor.
Truth Table for Turn-ON/Turn-OFF Logic
Inhibit:E2 Enable function, active High
Hold:E6 Hold and release function, active Low
Figure1Pin Configuration (top view)

Pin Definitions and Functions
Figure2Pin Configuration (top view) (cont’d)
Pin Definitions and Functions

Figure3Block Diagram


Absolute Maximum Ratings
TJ = –40 to 150 �C
Input
Reset Output
Reset Delay
Output
Inhibit
Hold
GND
Temperatures
Operating Range
Thermal Resistance
CharacteristicsI = 13.5 V; –40 �C < TJ < 125 �C; VE2 > 4 V (unless specified otherwise)Drop voltage = VI – VQ (measured when the output voltage VQ has dropped 100 mV from the nominal value
obtained at VI = 13.5 V)
Characteristics (cont’d)
Reset Generator
The reset output is Low for 1V
Inhibit
Overvoltage Protection
Figure4Test Circuit
Figure6Time Response
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