5-V Low-Drop Fixed Voltage Regulator
TLE 4270
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 time
ESD protection
>
4000 V
Ordering Code
Package
P-TO220-5-11
(P-TO220-5-1)
Type
TLE 4270
TLE 4270 S
TLE 4270 G
w
TLE 4270
w
TLE 4270 S
w
TLE 4270 G
q
TLE 4270 D
Q67000-A9209-A903 P-TO220-5-11
Q67000-A9243-A904 P-TO220-5-12
Q67006-A9201-A901 P-TO263-5-1
Q67000-A9209-A801 P-TO220-5-1
Q67000-A9243-A802 P-TO220-5-2
Q67006-A9201-A802 P-TO220-5-8
Q67006-A9360
P-TO252-5-1
P-TO220-5-12
(P-TO220-5-2)
P-TO263-5-1
(P-TO220-5-8)
w
Not for new design
Functional Description
q
New type
This 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-TO252-5-1 (D-PAK)
2 % accuracy. The short circuit protection limits the
output current of more than 650 mA. The device incorporates overvoltage protection
and temperature protection that disables the circuit at unpermissibly high temperatures.
Semiconductor Group
1
1998-11-01
TLE 4270
Pin Configuration
(top view)
P-TO220-5-11
(P-TO220-5-1)
P-TO220-5-12
(P-TO220-5-2)
P-TO263-5-1
(P-TO220-5-8)
1
RO
D
Ι
GND Q
5
1
5
1
5
AEP01922
P-TO252-5-1 (D-PAK)
D
RO
Ι
GND Q
AEP01923
Ι
GND
GND Q
RO
D
AEP02172
1
Ι
RO
D Q
5
AEP02580
Figure 1
Pin Definitions and Functions
Pin
1
2
3
4
5
Symbol
I
RO
GND
D
Q
Function
Input;
block to ground directly on the IC with ceramic capacitor
Reset Output;
the open collector output is connected to the 5 V output
via an integrated resistor of 30 kΩ.
Ground;
internally connected to heatsink.
Reset Delay;
connect a capacitor to ground for delay time adjustment.
5-V Output;
block to ground with 22
µF
capacitor, ESR
<
3
Ω.
2
1998-11-01
Semiconductor Group
TLE 4270
Application Description
The IC regulates an input voltage in the range of 5.5 V
<
V
I
<
36 V to
V
Qnom
= 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. A reset signal is generated for an output voltage of
V
Q
<
4.5 V. The delay for
power-on reset can be set externally with a capacitor.
Design Notes for External Components
An input capacitor
C
I
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
C
I
. An output capacitor
C
Q
is necessary for the stability of
the regulating circuit. Stability is guaranteed at values of
C
Q
≥
22
µF
and an ESR of
<
3
Ω.
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.
If the output voltage decreases below 4.5 V, an external capacitor
C
D
on pin 4 (D) will be
discharged by the reset generator. If the voltage on this capacitor drops below
V
DRL
, a
reset signal is generated on pin 2 (RO), i.e. reset output is set low. If the output voltage
rises above 4.5 V,
C
D
will be charged with constant current. After the power-on-reset time
the voltage on the capacitor reaches
V
DU
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
C
D
.
The IC also incorporates a number of internal circuits for protection against:
•
•
•
•
Overload
Overvoltage
Overtemperature
Reverse polarity
Semiconductor Group
3
1998-11-01
TLE 4270
Temperature
Sensor
Saturation
Control and
Protection
Circuit
5
Output
Input
1
Control
Amplifier
Adjustment
Bandgap
Reference
+
-
Buffer
Reset
Generator
2 Reset
Output
4 Reset
Delay
3
GND
AEB01924
Figure 2
Block Diagram
Semiconductor Group
4
1998-11-01
TLE 4270
Absolute Maximum Ratings
T
j
= – 40 to 150
°C
Parameter
Symbol
min.
Input
Voltage
Voltage
Current
Reset Output
Voltage
Current
Reset Delay
Voltage
Current
Output
Voltage
Current
Ground
Current
Temperatures
Junction temperature
Storage temperature
Limit Values
max.
Unit
Notes
V
I
V
I
I
I
– 42
42
65
V
V
t
≤
400 ms
internally limited
V
R
I
R
– 0.3
7
V
Internally limited
V
D
I
D
– 0.3
7
V
Internally limited
V
Q
I
Q
– 1.0
16
V
Internally limited
I
GND
– 0.5
–
A
–
T
j
T
stg
– 50
150
150
°C
°C
–
Optimum reliability and life time are guaranteed if the junction temperature does not
exceed 125
°C
in operating mode. Operation at up to the maximum junction temperature
of 150
°C
is possible in principle. Note, however, that operation at the maximum
permitted ratings could affect the reliability of the device.
Semiconductor Group
5
1998-11-01
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