TLE4262 Datasheet, PDF (4/16 Pages) Siemens Semiconductor Group – 5-V Low Drop Voltage Regulator

TLE 4262
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 V_DRL, a reset signal is issued on the reset output and not cancelled
again until the upper threshold V_DU is exceeded. If the reset threshold input is connected
to GND, reset is triggered at an output voltage of 4.5 V. The IC can be switched at the
TTL-compatible, low-active inhibit input. It also includes a number of internal circuits for
protection against:
• Overload
• Overtemperature
• Reverse polarity
I ¹³
Temperature
Sensor
Saturation
Control and
Protection
Circuit
Bandgap
Reference
Control
Amplifier
Buffer
Adjustment
9Q
6D
Reset
Generator
1 _RO
7 _RADJ
14
INH
3-5, 10-12
GND
AEB01081
Figure 2 Block Diagram
Data Sheet
4
Rev. 2.8, 2008-05-19