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TLE4258 Datasheet

5-V Low-Drop Voltage Regulator

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5-V Low-Drop Voltage Regulator
Preliminary Data
Features
q Low-drop voltage
q Low quiescent current
q Reset output
q Protection against reverse polarity
q Overvoltage protection 70 V
q Short-circuit proof
q Suited for automotive electronics
q Inhibit input
q Wide temperature range
TLE 4258
Bipolar IC
P-TO220-7-1
Type
TLE 4258
Ordering Code
Q67000-A8238
Package
P-TO220-7-1
The TLE 4258 is a very low drop voltage regulator which provides two regulated 5-V output
voltages. The main regulator can be loaded with 750 mA and is turned on and off by pin 5 (pin
5 unconnected = main regulator off). In addition, the main regulator incorporates a short-circuit
current limitation and is turned off in case of overvoltage (VI > VI OFF). The standby regulator
can be loaded with 35 mA, it does not incorporate a short-circuit current limitation and remains
permanently active at positive input voltage independent of the turn-off functions of the main
regulator.
If the main regulator output voltage is less than 4.5 V, the reset output is switched to low without
delay. As soon as the reset threshold has been exceeded, a delay time to be set by an external
capacitor expires and afterwards the reset output switches to high again.
If the lines to the controller are long, the oscillating circuit of line inductance and input
capacitance C I can be attenuated by a resistor 1 connected in series to C I.
Circuit Description
The TLE 4258 incorporates a main and standby-control regulator: The amplifiers regulate the
output voltage by comparing the output voltage (from the voltage divider) with a highly precise
reference voltage. The standby regulator directly controls the base of a PNP series transistor
and the main regulator via a buffer that can be turned off with inhibit pulse at pin 5. If the output
voltage VQ at pin 7 drops below 4.5 V, a reset signal is released which can only be disabled
after a delay time to be set at pin 6. The main output is current-limited and remains active up
to the input voltage VI OFF.
Semiconductor Group
1
09.94



Siemens Electronic Components Datasheet

TLE4258 Datasheet

5-V Low-Drop Voltage Regulator

No Preview Available !

Pin Configuration
(top view)
TLE 4258
Pin Definitions and Functions
Pin Symbol Function
1 VI Input of voltage regulator
2 Q RES Reset output; open-collector output NPN to pin 4. If the output voltage
VQ drops below the reset threshold, the output stage becomes conduc-
tive.
3
Q ST
Standby output, connect with a capacitor 10 µF
4
GND
Ground; reference potential
5 INH Inhibit (main regulator ON/OFF), input for turning on/off main
regulator, connected to a 22-kseries resistor. With open input, the
main regulator remains turned off.
6 D RES Reset delay; pin for reset capacitor; the size of this capacitor deter-
mines the delay time of the reset signal typ. 175 ms/µF.
7 VQ REG Main regulator output, connected to a capacitor 22 µF.
Semiconductor Group
2


Part Number TLE4258
Description 5-V Low-Drop Voltage Regulator
Maker Siemens
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TLE4258 Datasheet PDF






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