TLE4268 Datasheet, PDF (1/13 Pages) Siemens Semiconductor Group – 5-V Low-Drop Fixed Voltage Regulator

5-V Low-Drop Fixed Voltage Regulator
Features
• Output voltage tolerance ≤ ± 2 %
• Very low current consumption
• Low-drop voltage
• Watchdog
• Settable reset threshold
• Overtemperature protection
• Reverse polarity protection
• Short-circuit proof
• Suitable for use in automotive electronics
• Wide temperature range
TLE 4268
P-DSO-8-1
Type
TLE 4268 GS
TLE 4268 G
Ordering Code
Q67006-A9229
Q67006-A9146
Package
P-DSO-8-1 (SMD)
P-DSO-20-6 (SMD)
P-DSO-20-6
Functional Description
This device is a 5-V low-drop fixed-voltage regulator. The maximum input voltage is
45 V. It can deliver an output current of at least 180 mA. The IC is short-circuit proof and
features temperature protection that disables the circuit in the event of impermissibly
high temperatures. The watchdog function is disabled as a function of the load, so that
a controller is not interrupted during sleep mode by a watchdog reset.
Application Description
The IC regulates an input voltage V_i in the range 5.5 V < V_i < 45 V to V_qrated = 5.0 V. In
the event of an output voltage V_Q < V_RT, a reset signal is generated. The wiring of the
reset switching threshold input enables the value of V_RT to be reduced. The reset delay
time can be adjusted using an external capacitor. The integrated watchdog monitors the
connected active controller. If there is no positive-going edge at the watchdog input, the
reset output is set to low. The reset delay capacitor provides a wide adjustment range
for the pulse repetition time. The watchdog function is only activated if the load exceeds
8 mA. This ensures that a microcontroller is not activated during power-down and the
current drain is not increased. The IC is protected against overload and
overtemperature.
Semiconductor Group
1
1998-11-01