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TLE4268

5-V Low-Drop Fixed Voltage Regulator

Infineon Technologies 

TLE 4268

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-saturation of the power element. If the externally scaled down

output voltage at the reset threshold input drops below 1.35 V, 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:

• Overload

• Overtemperature

• Reverse polarity

Input 18

Temperature

Sensor

Adjustment

Bandgap

Reference

Protection

Circuit

Control

Amplifier

4-7, 14-17

GND

Figure 3

P-DSO-20-6

Block Diagram TLE 4268 G

Data Sheet Rev. 1.2

4

12 Output

Reset

Generator

3 Reset

Output

10

Reset

Switching

Threshold

Watchdog

9 Reset

Delay

11

Watchdog

Input

AEB01539

2000-10-10

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