tle4271.pdf

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5-V Low-Drop Fixed Voltage Regulator
TLE 4271-2
Features
• Output voltage tolerance
2%
• Low-drop voltage
• Integrated overtemperature protection
• Reverse polarity protection
• Input voltage up to 42 V
• Overvoltage protection up to 65 V (
400 ms)
P-TO220-7-11
• Short-circuit proof
• Suitable for use in automotive electronics
• Wide temperature range
• Adjustable reset and watchdog time
Type
Ordering Code Package
TLE 4271-2
Q67000-A9446
P-TO220-7-11
TLE 4271-2 S Q67000-A9448
P-TO220-7-12
P-TO263-7-1
TLE 4271-2 G Q67006-A9447
P-TO263-7-1
Functional Description
The TLE 4271-2 is functional and electrical identical to
the TLE 4271.
The device is a 5-V low-drop fixed-voltage regulator.
The maximum input voltage is 42 V (65 V,
P-TO220-7-12
2 % accuracy. The short circuit protection limits the output current of more than 650 mA.
The IC can be switched off via the inhibit input. An integrated watchdog monitors the
connected controller. The device incorporates overvoltage protection and temperature
protection that disables the circuit at overtemperature.
Data Sheet Rev. 2.4
1
2001-04-04
400 ms).
Up to an input voltage of 26 V and for an output current
up to 550 mA it regulates the output voltage within a
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TLE 4271-2
P-TO220-7-11
P-TO220-7-12
P-TO263-7-1
1
7
RO
GND
D
Q
1
7
1
7
INH
WI
AEP01938
RO
D Q
RO
D Q
INH
GND
WI
INH
GND
WI
AEP02017
AEP01939
Figure 1
Pin Configuration (top view)
Pin Definitions and Functions
Pin Symbol Function
1
I
Input ; block to ground directly on the IC with ceramic capacitor.
2
I H Inhibit
3
O Reset Output ; the open collector output is connected to the 5 V output
via an integrated resistor of 30 k
4
D Ground
5
D Reset Delay ; connect a capacitor to ground for delay time adjustment.
6
I
Watchdog Input
7
Q 5-V Output ; block to ground with 22 µ
F capacitor, ESR <
3 Ω .
Data Sheet Rev. 2.4
2
2001-04-04
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TLE 4271-2
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 a series transistor via a buffer. Saturation control as a function of the load
current prevents any over-saturation of the power element.
The reset output RO is in high-state if the voltage on the delay capacitor C D is greater or
equal V UD . The delay capacitor C D is charged with the current I D for output voltages
greater than the reset threshold V RT . If the output voltage gets lower than V RT (’reset
condition’) a fast discharge of the delay capacitor C D sets in and as soon as V D gets lower
than V LD the reset output RO is set to low-level.
The time for the delay capacitor charge from V UD to V LD is the reset delay time t D .
When the voltage on the delay capacitor has reached V UD and reset was set to high, the
watchdog circuit is enabled and discharges C D with the constant current I DWD . If there is
no rising edge observed at the watchdog input, C D will be discharge down to V LDW , then
reset output RO will be set to low and C D will be charged again with the current I DWC until
V D reaches V UD and reset will be set high again.
If the watchdog pulse (rising edge at watchdog input WI) occurs during the discharge
period C D is charged again and the reset output stays high. After V D has reached V UD ,
the periodical behavior starts again.
Internal protection circuits protect the IC against:
• Overload
• Overvoltage
• Overtemperature
• Reverse polarity
Data Sheet Rev. 2.4
3
2001-04-04
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TLE 4271-2
Temperature
Sensor
Saturation
Control and
Protection
Circuit
1
7
Q
Control
Amplifier
Buffer
3
Bandgap
RO
Adjustment
+
-
Reference
Reset
Generator
5
D
Watchdog
6
WI
2
4
INH
GND
AEB01940
Figure 2
Block Diagram
Data Sheet Rev. 2.4
4
2001-04-04
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TLE 4271-2
Absolute Maximum Ratings
T j = – 40 to 150 °
C
Parameter
Symbol
Limit Values
Unit
Notes
min.
max.
Input
Voltage
Voltage
Current
V I
V I
I I
– 42
–
–
42
65
–
V
V
mA
–
t ≤ 400 ms
internally limited
Inhibit
Voltage
Voltage
Current
V INH
V INH
I INH
– 42
–
–
42
65
–
V
V
mA
–
t ≤ 400 ms
internally limited
Reset Output
Voltage
Current
V RO
I RO
– 0.3
–
42
–
V
mA
–
internally limited
Reset Delay
Voltage
Current
V D
I D
– 0.3
– 5
7
5
V
mA
–
–
Watchdog
Voltage
Current
V W
I W
– 0.3
– 5
7
5
V
mA
–
–
Output
Voltage
Current
V Q
I Q
– 1.0
– 5
16
–
V
mA
–
internally limited
Ground
Current
I GND
– 0.5
–
A
–
Temperatures
Junction temperature
Storage temperature
T j
T stg
–
– 50
150
150
C
–
–
C
Data Sheet Rev. 2.4
5
2001-04-04
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