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PDF TLE4271-2 Data sheet ( Hoja de datos )
| Número de pieza | TLE4271-2 | |
| Descripción | 5-V Low-Drop Fixed Voltage Regulator | |
| Fabricantes | Infineon Technologies AG | |
| Logotipo |  |
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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)
• Short-circuit proof
• Suitable for use in automotive electronics
• Wide temperature range
• Adjustable reset and watchdog time
P-TO220-7-11
Type
TLE 4271-2
TLE 4271-2 S
TLE 4271-2 G
Ordering Code
Q67000-A9446
Q67000-A9448
Q67006-A9447
Package
P-TO220-7-11
P-TO220-7-12
P-TO263-7-1
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, ≤ 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
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
1 page  
TLE 4271-2
Absolute Maximum Ratings
Tj = – 40 to 150 °C
Parameter
Symbol
Limit Values
min.
max.
Input
Voltage
Voltage
Current
VI
VI
II
Inhibit
Voltage
Voltage
Current
VINH
VINH
IINH
Reset Output
Voltage
Current
VRO
IRO
Reset Delay
Voltage
Current
VD
ID
Watchdog
Voltage
Current
VW
IW
Output
Voltage
Current
VQ
IQ
Ground
Current
IGND
Temperatures
Junction temperature
Storage temperature
Tj
Tstg
– 42
–
–
– 42
–
–
– 0.3
–
– 0.3
–5
– 0.3
–5
– 1.0
–5
– 0.5
–
– 50
42
65
–
42
65
–
42
–
7
5
7
5
16
–
–
150
150
Data Sheet Rev. 2.4
5
Unit Notes
V–
V t ≤ 400 ms
mA internally limited
V–
V t ≤ 400 ms
mA internally limited
V–
mA internally limited
V–
mA –
V–
mA –
V–
mA internally limited
A–
°C –
°C –
2001-04-04
5 Page 
TLE 4271-2
Application Description
The IC regulates an input voltage in the range of 6 V < VI < 40 V to VQnom = 5.0 V. Up to
26 V it produces a regulated output current of more than 550 mA. Above 26 V the save-
operating-area protection allows operation up to 36 V with a regulated output current of
more than 300 mA. Overvoltage protection limits operation at 42 V. The overvoltage
protection hysteresis restores operation if the input voltage has dropped below 36 V. The
IC can be switched off via the inhibit input, which causes the quiescent current to drop
below 50 µA. A reset signal is generated for an output voltage of VQ < 4.5 V. The
watchdog circuit monitors a connected controller. If there is no positive-going edge at the
watchdog input within a fixed time, the reset output is set to low. The delay for power-on
reset and the maximum permitted watchdog-pulse period can be set externally with a
capacitor.
Design Notes for External Components
An input capacitor CI is necessary for compensation of line influences. The resonant
circuit consisting of lead inductance and input capacitance can be damped by a resistor
of approx. 1 Ω in series with CI. An output capacitor CQ is necessary for the stability of
the regulating circuit. Stability is guaranteed at values of CQ ≥ 22 µF and an ESR of
< 3 Ω.
Reset Circuitry
If the output voltage decreases below 4.5 V, an external capacitor CD on pin D will be
discharged by the reset generator. If the voltage on this capacitor drops below VDRL, a
reset signal is generated on pin RO, i.e. reset output is set low. If the output voltage rises
above the reset threshold, CD will be charged with constant current. After the power-on-
reset time the voltage on the capacitor reaches VDU and the reset output will be set high
again. The value of the power-on-reset time can be set within a wide range depending
of the capacitance of CD.
Reset Timing
The power-on reset delay time is defined by the charging time of an external capacitor
Cd which can be calculated as follows:
tD = CD∗∆V/ID
Definitions:
CD = delay capacitor
tD = reset delay time
ID = charge current, typical 14 µA
∆V = VUD, typical 1.8 V
VUD = upper delay timing threshold at CD for reset delay time
Data Sheet Rev. 2.4
11
2001-04-04
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet TLE4271-2.PDF ] | |
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