TLE 4267
5-V Low-Drop Voltage Regulator
TLE 4267
Bipolar IC
Features
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Output voltage tolerance
≤ ±
2 %
Low-drop voltage
Very low standby current consumption
Input voltage up to 40 V
Overvoltage protection up to 60 V (≤ 400 ms)
Reset function down to 1 V output voltage
ESD protection up to 2000 V
Adjustable reset time
On/off logic
Overtemperature protection
Reverse polarity protection
Short-circuit proof
Wide temperature range
Suitable for use in automotive electronics
Ordering Code Package
Q67000-A9153
P-TO220-7-3
P-TO220-7-180 (SMD)
P-TO220-7-230
P-TO220-7-3
P-TO220-7-180
Type
TLE 4267
TLE 4267 G Q67006-A9169
TLE 4267 S Q67000-A9246
Functional Description
P-TO220-7-230
TLE 4267 is a 5-V low-drop voltage regulator in a
TO220-7 package. It supplies an output current of > 400 mA. The IC is shortcircuit-proof
and incorporates temperature protection that disables the IC at overtemperature.
Application
The IC regulates an input voltage
V
I
in the range 5.5 V <
V
I
< 40 V to
V
Qrated
= 5.0 V. A
reset signal is generated for an output voltage
V
Q
of < 4.5 V. The reset delay can be set
with an external capacitor. The device has two logic inputs. It is turned-ON by a voltage
of > 4 V on E2 by the ignition for example. It remains active as a function of the voltage
on E6, even if the voltage on E2 goes Low. This makes it possible to implement a self-
holding circuit without external components. When the device is turned-OFF, the output
voltage drops to 0 V and current consumption tends towards 0
µA.
Semiconductor Group
1
1998-11-01
TLE 4267
Design Notes for External Components
The input capacitor
C
I
is necessary for compensation 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
. The output capacitor is necessary for the stability of the
regulating circuit. Stability is guaranteed at values of
≥
22
µF
and an ESR of
≤
3
Ω
within
the operating temperature range.
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-saturating of the power element.
A comparator in the reset-generator block compares a reference that is independent of
the input voltage to the scaled-down output voltage. If this reaches a value of 4.5 V, the
reset-delay capacitor is discharged and then the reset output is set Low. As the output
voltage increases again, the reset-delay capacitor is charged with constant current from
V
Q
= 4.5 V onwards. When the capacitor voltage reaches the upper switching threshold,
reset goes High again. The reset delay can be set within wide range by selection of the
external capacitor.
With the integrated turn-ON/turn-OFF logic it is simple to implement delayed turn-OFF
without external components.
Truth Table for Turn-ON/Turn-OFF Logic
Pin 2
L
H
H
X
L
L
Pin 6
X
X
L
L
L
H
V
Q
Remarks
Initial state, pin 6 internally pulled up
Regulator switched on via pin 2, by ignition for example
Pin 6 clamped active to ground by controller while pin 2 is still
high
Previous state remains, even ignition is shut off: self-holding
state
Ignition shut off while regulator is in self-holding state
Regulator shut down by releasing of pin 6 while pin 2 remains
Low, final state. No active clamping required by external self-
holding circuit (µC) to keep regulator shut off.
OFF
ON
ON
ON
ON
OFF
Pin 2: (Inhibit, E2) Enable function, active High
Pin 6: (Hold, E6) Hold and release function, active Low
Semiconductor Group
2
1998-11-01
TLE 4267
Pin Configuration
(top view)
P-TO220-7-3
P-TO220-7-180
P-TO220-7-230
1
2 3
4 5 6
7
1 2
3 4 5
6
7
1 2 3 4 5 6 7
Ι
E2
R
GND
D
E6
AEP01724
Ι
E2
Ι
R
E2
GND
D
E6
Q
AEP02123
R
GND
D
E6
Q
AEP01481
Pin Definitions and Functions
Pin
1
2
3
4
5
6
7
Symbol
I
Function
Input;
block to ground directly at the IC by a ceramic capacitor
Inhibit;
device is turned-ON by High signal on this pin; internal
pulldown resistor of 100 kΩ
Reset Output;
open-collector output internally connected to
the output via a resistor of 30 kΩ
Ground;
connected to rear of chip
Reset Delay;
connect with capacitor to GND for setting delay
Hold;
see truth table above for function; this input is connected
to output voltage across pullup resistor of 50 kΩ
5-V Output;
block to GND with 22-µF capacitor, ESR < 3
Ω
E2
R
GND
D
E6
Q
Semiconductor Group
3
1998-11-01
TI Technology Forum
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