5-V Low-Drop Voltage Regulator
TLE 4260
Features
•
•
•
•
•
•
•
•
•
•
•
Low-drop voltage
Very low quiescent current
Low starting current consumption
Integrated temperature protection
Protection against reverse polarity
Input voltage up to 42 V
Overvoltage protection up to 65 V (
≤
400 ms)
Short-circuit proof
Suited for automotive electronics
Wide temperature range
EMC proofed (100 V/m)
P-TO220-5-1
Type
w
TLE 4260
w
TLE 4260 S
Ordering Code
Q67000-A8187
Q67000-A9044
Package
P-TO220-5-1
P-TO220-5-2
P-TO220-5-2
w
Please also refer to the new pin compatible device TLE 4270
Functional Description
TLE 4260; S is a 5-V low-drop fixed-voltage regulator in a P-TO220-5-H/S package. The
maximum input voltage is 42 V (65 V/
≤
400 ms). The device can produce an output
current of more than 500 mA. It is shortcircuit-proof and incorporates temperature
protection that disables the circuit at unpermissibly high temperatures.
Due to the wide temperature range of – 40 to 150
°C,
the TLE 4260; S is also suitable
for use in automotive applications.
The IC regulates an input voltage
V
I
in the range 6 <
V
I
< 35 V to
V
Qnominal
= 5.0 V. A reset
signal is generated for an output voltage of
V
Q
< 4.75 V. The reset delay can be set
externally with a capacitor. If the output current is reduced below 10 mA, the regulator
switches internally to standby and the reset generator is turned off. The standby current
drops to max. 700
µA.
Semiconductor Group
1
1998-11-01
TLE 4260
Pin Configuration
(top view)
TLE 4260
TLE 4260 S
1
2
3
4 5
GND
V
Ι
V
Q
QVRES DRES
AEP00577
Pin Definitions and Functions (TLE 4260 and TLE 4260 S)
Pin No.
1
2
3
4
5
Symbol
Function
Input;
block directly to ground at the IC by a 470-nF capacitor
Reset output;
open collector output controlled by the reset
delay
Ground
Reset delay;
wired to ground with a capacitor
5-V output voltage;
block to ground with a 22-µF capacitor
V
I
QVRES
GND
DRES
V
Q
Semiconductor Group
2
1998-11-01
TLE 4260
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
ST
, a reset signal
is issued on pin 2 and not cancelled again until the upper threshold
V
DT
is exceeded. For
an output current of less than
I
QN Off
= 10 mA the standby changeover turns off the reset
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
Overvoltage
Monitoring
Temperature
Sensor
Saturation
Control and
Protection
Circuit
7
Control
Amplifier
Input
1
Output
Adjustment
BANDGAP
Reference
Buffer
+
-
STANDBY
Changeover
RESET
Generator
4 RESET
Delay
2
RESET
3
GND
AEB00578
Block Diagram
Semiconductor Group
3
1998-11-01
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