5-V Voltage Regulator
TLE 4287 G
Features
•
•
•
•
•
•
•
•
•
•
•
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Output voltage tolerance
≤ ±
2%
Very low standby current consumption
Input voltage up to 42 V
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
Very wide temperature range
Very small output capacitor
Ordering Code
Q67006-A9286
P-DSO-14-8
Type
TLE 4287 G
New type
Package
P-DSO-14-8 (SMD)
Functional Description
The
TLE 4287 G
is a monolithic integrated 5 V voltage regulator in
P-DSO-14-8
package. It supplies an output current
I
Q
> 250 mA. The IC is short circuit proof and
incorporates temperature protection which turns off the device at overtemperature.
The input voltage
V
I
is regulated in the range of 7.5 V <
V
I
< 40 V to
V
Q,nom
= 5 V.
Therefore a reference voltage, which is kept highly accurate by resistance adjustment,
is compared via a control amplifier to a voltage that is proportional to the output voltage.
The control amplifier drives the base of the series transistor by a buffer.
A comparator in the reset-generator block compares a reference voltage that is
independent of the input voltage to the scaled-down output voltage. In the case of an
output voltage
V
Q
< 4.5 V the reset delay capacitor is discharged and a reset signal is
generated by setting the reset output LOW. The reset delay time can be set by choosing
the external capacitor over a wide range. When the output voltage rises above
V
Q
≥
4.5 V the reset delay capacitor is charged again. As soon as the delay capacitor
voltage reaches the upper switching threshold the reset output pin is set HIGH again.
Data Sheet Version 1.3
1
2001-09-12
TLE 4287 G
The device has two logic inputs,
EN
and
H.
It is turned ON by a voltage > 4 V at
EN,
for
example by the ignition and remains active in case
H
is set LOW, even if the voltage at
EN
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
µ
A. (Please see following truth table).
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 for
C
Q
≥
100 nF within the operating
temperature range.
State Table for Turn-On/Turn-Off Logic
Nr.
1
2
3
4
5
6
Enable
EN
Hold
H
L
H
H
X
L
L
X
X
L
L
L
H
V
Q
0V
5V
5V
5V
5V
0V
Remarks
Initial state
Regulator switched on via pin 6, by ignition for
example
Pin 9 clamped active to GND by controller
while pin 6 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 9
while pin 6 remains LOW, final state. No
active clamping required by external self-
holding circuit (
µ
C) to keep regulator shut off
Data Sheet Version 1.3
2
2001-09-12
TLE 4287 G
I
N.C.
GND
GND
GND
EN
RO
1
2
3
4
5
6
7
14
13
12
11
10
9
8
AEP02240
GND
Q
GND
GND
GND
H
D
Figure 1
Pin Configuration
(top view)
Pin Definitions and Functions
Pin No.
1
2
3, 4, 5, 10,
11, 12, 14
6
Symbol
I
N.C.
GND
EN
Function
Input;
block to ground directly at the IC by a ceramic
capacitor
Not connected
Ground
Enable;
active high, device is turned ON by HIGH signal at
this pin, internally connected to GND via pull-down resistor of
100 k
Ω
Reset Output;
open-collector output, internally connected to
Q via a pull-up resistor of 30 k
Ω
Reset Delay;
connect to GND via external delay capacitor for
setting delay time
Hold
and release; active low, see truth table above for
function, connected to Q via a pull-up resistor of 50 k
Ω
Output;
block to GND with a capacitor
C
Q
≥
100 nF
7
8
9
13
RO
D
H
Q
Data Sheet Version 1.3
3
2001-09-12
TLE 4287 G
Temperature
Sensor
Saturation
Control and
Protection Circuit
13 5V
Output
Input
1
Control
Amplifier
Adjustment
Bandgap
Reference
Buffer
Reset
Generator
7 Reset
Output
8 Reset
Delay
Turn-ON /
Turn-OFF
Logic
6
Enable
9
Hold
3,4,5,10,11,12,14
GND
AEB02241
Figure 2
Block Diagram
Data Sheet Version 1.3
4
2001-09-12
TLE 4287 G
Absolute Maximum Ratings
Parameter
Symbol
Limit Values
min.
Input I
Voltage
Current
Output Q
Voltage
Current
Reset Output RO
Voltage
Current
Reset Delay D
Voltage
Current
Enable EN
Voltage
Current
Hold H
Voltage
Current
max.
Unit
Remarks
V
I
I
I
– 0.5
–
42
–
V
mA
–
internally limited
V
Q
I
Q
– 0.3
–
7
–
V
–
–
internally limited
V
R
I
R
– 0.3
–
7
–
V
–
–
internally limited
V
D
I
D
– 0.3
–
42
–
V
–
–
–
V
EN
I
EN
– 42
–5
42
5
V
mA
–
t
≤
400 ms
V
H
I
H
–2
–
7
–
V
–
–
internally limited
Data Sheet Version 1.3
5
2001-09-12
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