TLE4260 Siemens Semiconductor Group, TLE4260 Datasheet - Page 3

• Manufacturer Part Number: TLE4260
• Description: 5-V Low-Drop Voltage Regulator
• Manufacturer: Siemens Semiconductor Group

Semiconductor Group
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 output voltage goes
below 96% of its typical value, an external capacitor is discharged on pin 4 by the reset
generator. If the voltage on the capacitor reaches the lower threshold V
is issued on pin 2 and not cancelled again until the upper threshold V
an output current of less than I
generator. The latter is turned on again when the output current increases, the output
voltage drops below 4.2 V or the delay capacitor is discharged by external measures.
The IC also incorporates a number of internal circuits for protection against:
• Overload
• Overvoltage
• Overtemperature
• Reverse polarity
Block Diagram
Input
1
Overvoltage
Monitoring
Adjustment
Temperature
Sensor
BANDGAP
Reference
QN Off
= 10 mA the standby changeover turns off the reset
Control
Amplifier
+
-
GND
3
3
Buffer
STANDBY
Changeover
Saturation
Control and
Protection
Circuit
RESET
Generator
DT
ST
is exceeded. For
, a reset signal
AEB00578
TLE 4260
7
4
2
1998-11-01
Output
RESET
Delay
RESET