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TLE4287G

5-V Voltage Regulator

Infineon Technologies 

TLE 4287 G

The device has two logic inputs, EN and H. It is turned ON by a voltage > 4 V at EN, for

example by the ignition and remains active in case H is set LOW, even if the voltage at

EN goes LOW. This makes it possible to implement a self-holding circuit without external

components. When the device is turned OFF, the output voltage drops to 0 V and current

consumption tends towards 0 µA. (Please see following truth table).

Design Notes for External Components

The input capacitor CI is necessary for compensation line influences. The resonant

circuit consisting of lead inductance and input capacitance can be damped by a resistor

of approx. 1 Ω in series with CI. The output capacitor is necessary for the stability of the

regulating circuit. Stability is guaranteed for CQ ≥ 100 nF within the operating

temperature range.

State Table for Turn-On/Turn-Off Logic

Nr. Enable EN Hold H VQ Remarks

1

L

X

0 V Initial state

2

H

X

5 V Regulator switched on via pin 6, by ignition for

example

3

H

L

5 V Pin 9 clamped active to GND by controller

while pin 6 is still HIGH

4

X

L

5 V Previous state remains, even ignition is shut

off: self-holding state

5

L

L

5 V Ignition shut off while regulator is in self-

holding state

6

L

H

0 V Regulator shut down by releasing of pin 9

while pin 6 remains LOW, final state. No

active clamping required by external self-

holding circuit (µC) to keep regulator shut off

Data Sheet Version 1.3

2

2001-09-12

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