OPTIREG™ Linear TLE4278G
5 V low drop fixed voltage regulator
Features
•
Output voltage tolerance ≤ ±2%
•
Very low current consumption
•
Separated reset and watchdog output
•
Low-drop voltage
•
Watchdog
•
Adjustable watchdog activating threshold
•
Adjustable reset threshold
•
Overtemperature protection
•
Reverse polarity protection
•
Short-circuit proof
•
Suitable for use in automotive electronics
•
Wide temperature range
•
Green Product (RoHS compliant)
Potential applications
General automotive applications.
Product validation
Qualified for automotive applications. Product validation according to AEC-Q100/101.
Description
The OPTIREG™ Linear TLE4278G is a monolithic integrated low-drop fixed output voltage regulator supplying
loads up to 200 mA. The IC is available in a PG-DSO-14 package. It is designed to supply microprocessor
systems under the severe conditions of automotive applications and therefore equipped with additional
protection functions against over- load, short circuit and overtemperature. The TLE4278 can also be used in
other applications where a stabilized voltage is required.
Type
Package
Marking
TLE4278G
PG-DSO-14
TLE4278G
Data Sheet
www.infineon.com/OPTIREG-Linear
1
Rev. 1.5
2018-09-10
OPTIREG™ Linear TLE4278G
5 V low drop fixed voltage regulator
Table of contents
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Potential applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Product validation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table of contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
3.1
3.2
3.3
General product characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
4.1
4.2
4.3
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5
5.1
5.2
5.3
5.4
5.5
5.6
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input, output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reset timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reset switching threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Watchdog activating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Watchdog timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hints for unused pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Data Sheet
2
5
5
6
6
13
13
14
15
16
17
18
Rev. 1.5
2018-09-10
OPTIREG™ Linear TLE4278G
5 V low drop fixed voltage regulator
Block diagram
1
Block diagram
VΙ
13
9
Temperature
Sensor
Protection
Circuit
14
VQ
RO
Reset
Generator
-
+
Control
Amplifier
7
1
Bandgap
Reference
Watchdog
2
3-5, 10-12
WADJ
GND
Figure 1
Data Sheet
6
RADJ
WO
D
8
WΙ
AEB02114
Block diagram
3
Rev. 1.5
2018-09-10
OPTIREG™ Linear TLE4278G
5 V low drop fixed voltage regulator
Pin configuration
2
Pin configuration
WO
WADJ
GND
GND
GND
D
RADJ
1
2
3
4
5
6
7
14
13
12
11
10
9
8
RO
VΙ
GND
GND
GND
VQ
WΙ
AEP02113
Figure 2
Pin configuration PG-DSO-14 (top view)
Table 1
Pin definitions and functions
Pin
Symbol
Function
1
WO
Watchdog output; the open collector output is connected to the 5 V output
via an integrated resistor of 30 kΩ.
2
WADJ
Watchdog adjust; an external resistor to GND determines the watchdog
activating threshold.
3, 4, 5, 10, 11, 12
GND
Ground
6
D
Reset delay; connect a capacitor to ground for delay time adjustment.
7
RADJ
Reset switching threshold adjust; for setting the switching threshold,
connect a voltage divider from output to ground. If this input is connected to
ground, the reset is triggered at the internal threshold.
8
WI
Watchdog input; rising edge-triggered input for monitoring a
microcontroller.
9
Q
5 V output voltage; block to ground with min. 10 µF capacitor, ESR ≤ 5 Ω.
13
I
Input voltage; block to ground directly on the IC with ceramic capacitor.
14
RO
Reset output; the open collector output is connected to the 5 V output via an
integrated resistor of 30 kΩ.
Data Sheet
4
Rev. 1.5
2018-09-10
OPTIREG™ Linear TLE4278G
5 V low drop fixed voltage regulator
General product characteristics
3
General product characteristics
3.1
Absolute maximum ratings
Table 2
Absolute maximum ratings
Tj = -40°C to 150°C
Parameter
Symbol
Values
Unit Note or Test Condition
Min.
Typ.
Max.
Input voltage I
Voltage
VI
-42
–
45
V
–
Current
II
–
–
–
mA
Internally limited
Voltage
VQ
-1
–
25
V
–
Current
IQ
–
–
–
mA
Internally limited
Voltage
VRO
-0.3
–
25
V
–
Current
IRO
-5
–
5
mA
–
Voltage
VD
-0.3
–
7
V
–
Current
ID
-2
–
2
mA
–
Output voltage Q
Reset output RO
Reset delay D
Reset switching threshold adjust RADJ
Voltage
VRADJ
-0.3
–
7
V
–
Current
IRADJ
–
–
–
mA
Internally limited
Voltage
VWI
-0.3
–
7
V
–
Current
IWI
–
–
–
mA
Internally limited
Voltage
VWO
-0.3
–
25
V
–
Current
IWO
-5
–
5
mA
–
Voltage
VWADJ
-0.3
–
7
V
–
Current
IWADJ
–
–
–
mA
Internally limited
IGND
-100
–
50
mA
–
Junction temperature
Tj
-50
–
150
°C
–
Storage temperature
Tstg
-50
–
150
°C
–
Watchdog input WI
Watchdog output WO
Watchdog adjust WADJ
Ground GND
Current
Temperatures
Data Sheet
5
Rev. 1.5
2018-09-10
OPTIREG™ Linear TLE4278G
5 V low drop fixed voltage regulator
General product characteristics
Note:
ESD protection according to MIL Std. 883: ±2 kV.
Maximum ratings are absolute ratings; exceeding any one of these values may cause irreversible
damage to the integrated circuit.
3.2
Functional range
Table 3
Functional range
Parameter
Symbol
Values
Unit Note or Test Condition
Min.
Typ.
Max.
Input voltage
VI
5.5
–
45
V
–
Junction temperature
Tj
-40
–
150
°C
–
Note:
In the functional range the functions given in the circuit description are fulfilled.
3.3
Thermal resistance
Table 4
Thermal resistance
Parameter
Symbol
Values
Unit Note or Test Condition
Min.
Typ.
Max.
–
80
K/W
–
30
K/W
Junction ambient
Rthj-a
–
Junction pin
Rthj-pin
–
3
1)
Measured to pin 4
2
1) Package mounted on PCB 80 × 80 × 1.5 mm ; 35 µm Cu; 5 µm Sn; Heat Sink Area 6 cm ; zero airflow.
Data Sheet
6
Rev. 1.5
2018-09-10
OPTIREG™ Linear TLE4278G
5 V low drop fixed voltage regulator
Functional description
4
Functional description
The TLE4278 is a monolithic integrated low-drop fixed output voltage regulator supplying loads up to 200 mA.
An input voltage VI in the range of 5.5 V ≤ VI ≤ 45 V is regulated to VQ,nom = 5 V with an accuracy of ±2%.
The device operates in the wide temperature range of Tj = -40°C to 150°C.
Two additional features are implemented in the TLE4278 a load dependent watchdog function as well as a
sophisticated reset function including power on reset, under voltage reset, adjustable reset delay time and
adjustable reset switching threshold.
The watchdog function monitors the microcontroller, including time base failures. In case of a missing rising
edge within a certain pulse repetition time the watchdog output is set to “low”. Programming of the max.
repetition time can be done easily by an external reset delay capacitor. To prevent a reset in case of missing
pulses, the watchdog output WO is separate from the reset output RO for the TLE4278. The watchdog output
can be used as an interrupt signal for the microcontroller. In any case it is possible to connect pin WO and pin
RO externally.
When the controller is set to sleep mode or low power mode its current consumption drops and no watchdog
pulses are created. In order to avoid unnecessary wake-up signals due to missing pulses at pin WI the
watchdog feature can be disabled as a function of the load current. The switch off threshold is set by an
external resistor to pin WADJ. The watchdog function can also be used as a timer, which periodically wakes up
the controller. Therefore the pin WADJ must be connected to the output Q.
The power on reset feature is necessary for a defined start of the microprocessor when switching on the
application. The reset signal at pin RO goes “high” after a certain delay timed trd when the output voltage of
the regulator has surpassed the reset threshold. The delay time is set by the external delay capacitor. An under
voltage reset circuit supervises the output voltage. In case VQ falls below the reset threshold the reset output
is set to “low” after a short reset reaction time trr. The reset “low” signal is generated down to an output
voltage VQ of 1 V. In addition the reset switching threshold can be adjusted by an external voltage divider. This
feature is useful with microprocessors which ensure a safe operation down to voltages below the internally
set reset threshold of 4.65 V typical.
Data Sheet
7
Rev. 1.5
2018-09-10
OPTIREG™ Linear TLE4278G
5 V low drop fixed voltage regulator
Functional description
4.1
Electrical characteristics
Table 5
Electrical characteristics
VI = 13.5 V; -40°C ≤ Tj ≤ 125°C (unless otherwise specified)
Parameter
Symbol
Values
Unit Note or Test Condition
Min.
Typ.
Max.
Output voltage
VQ
4.90
5.00
5.10
V
0 mA ≤ IQ ≤ 150 mA;
6 V ≤ VI ≤ 28 V
Output voltage
VQ
4.8
5.0
5.2
V
1 mA ≤ IQ ≤ 50 mA;
28 V ≤ VI ≤ 45 V
Output current limiting
IQ
200
400
–
mA
VQ = 4.8 V
Current consumption
Iq = II - IQ
Iq,o
–
180
200
µA
Tj = 25°C;
IQ = 0 mA
Current consumption
Iq = II - IQ
Iq,o
–
210
230
µA
IQ = 0 mA;
Tj = 85°C
Current consumption
Iq = II - IQ
Iq,150
–
5
12
mA
IQ = 150 mA
Drop voltage
VDR = VI - VQ
Vdr
–
0.25
0.5
V
IQ = 150 mA1)
Load regulation
∆VQ.lo
-30
-5
–
mV
IQ = 5 to 150 mA;
VI = 6 V
Line regulation
∆VQ,li
–
5
20
mV
VI = 6 to 28 V;
IQ = 5 mA
Reset threshold
VQ,rt
4.5
4.65
4.8
V
RADJ connected to GND
Reset headroom
∆VQ,rt =
(VQ,nom VQ,rt)
180
350
–
mV
IQ = 10 mA
Reset adjust threshold
VRADJ,th
1.28
1.35
1.45
V
VQ ≥ 3.5 V
Reset low voltage
VRO,l
–
0.20
0.40
V
Rext = 10 kΩ to VQ;
VQ ≥ 1 V
Reset high voltage
VRO,h
4.5
–
–
V
–
Reset pull-up
RRO
20
30
45
kΩ
Internal connected to VQ
Charging current
ID,c
2
5
8
µA
VD = 1.0 V
Upper timing threshold
VDU
1.5
1.9
2.3
V
–
Lower reset timing
threshold
VDRL
0.2
0.3
0.4
V
–
Delay time
trd
12
20
28
ms
CD = 47 nF
Reset reaction time
trr
0.4
1.0
2.0
µs
CD = 47 nF
Reset generator
Data Sheet
8
Rev. 1.5
2018-09-10
OPTIREG™ Linear TLE4278G
5 V low drop fixed voltage regulator
Functional description
Table 5
Electrical characteristics (cont’d)
VI = 13.5 V; -40°C ≤ Tj ≤ 125°C (unless otherwise specified)
Parameter
Symbol
Values
Unit Note or Test Condition
Min.
Typ.
Max.
Watchdog
Activating threshold
VWADJ,th
1.28
1.35
1.45
V
Voltage at WADJ
Current ratio
IQ/IWADJ
650
720
800
–
IQ ≤ 10 mA
Slew rate
dVWI/dt
5
–
–
V/µs From 20% up to
80% VQ
Watchdog low voltage
VWOL
–
0.2
0.4
V
Rext > 10 kΩ to VQ
Watchdog high voltage
VWOH
4.5
–
–
V
–
Watchdog pull-up
RWO
20
30
45
kΩ
Internal connected to VQ
Charge current
ID,wc
2
5
8
µA
VD = 1.0 V
Discharge current
ID,wd
0.6
1.3
2.0
µA
VD = 1.0 V
Upper timing threshold
VDU
1.5
1.9
2.3
V
–
Lower watchdog timing
threshold
VDWL
0.5
0.7
0.9
V
–
Watchdog output pulse
period
TWD,p
42
60
80
ms
Cd = 47 nF
7
13
19
ms
VQ > VRT
35
47
61
ms
Cd = 47 nF
Watchdog output low time tWD,l
Watchdog trigger time
TWI,tr
1) Measured when the output voltage VQ has dropped 100 mV from the nominal value.
Data Sheet
9
Rev. 1.5
2018-09-10
OPTIREG™ Linear TLE4278G
5 V low drop fixed voltage regulator
Functional description
4.2
Test circuit
ΙΙ
C Ι1
1000 μF
Ι WO
VΙ
WO
VΙ
WΙ
VWADJ
9
VQ
ΙQ
C Ι2
470 nF
Ι WADJ WADJ
VWO
13
VW
VD
CQ
10 μF
TLE 4278 G
1
2
8
3-5,
10-12
GND
6
D
CD
47 nF
Ι GND
RO
14
7
RADJ
Ι RO
VQ
VRO
VRE
AES02115
VDR = VΙ -VO Outside the control range
Figure 3
Data Sheet
Test circuit
10
Rev. 1.5
2018-09-10
OPTIREG™ Linear TLE4278G
5 V low drop fixed voltage regulator
Functional description
4.3
Typical performance characteristics
Drop voltage Vdr versus
output current IQ
Current consumption Iq
versus output current IQ
TL E4 2 7 8 _ IQ -IQ .VSD
AED01544
mV
I q [mA]
V dr
700
V I = 13.5V
T j = 25°C
10
600
500
1
400
Tj = 125 C
300
Tj = 25 C
0.1
200
100
0
0
50
100
150
200
250
0.01
0.1
mA
1
10
100
ΙQ
Current consumption Iq
versus input voltage VI
IQ [mA]
Output voltage VQ
versus input voltage VI
AED01546
12
Iq mA
VQ
Tj = 25 ˚C
10
10
8
8
6
AED01547
mA
6
R L= 33 Ω
R L= 33 Ω
4
4
R L= 50 Ω
2
0
2
R L= 100 Ω
0
10
20
30
0
40 V 50
VI
Data Sheet
0
2
4
6
8
V
VΙ
11
Rev. 1.5
2018-09-10
OPTIREG™ Linear TLE4278G
5 V low drop fixed voltage regulator
Functional description
Charge current ID,wc and discharge current ID,wd
versus temperature Tj
AED03111
8
μA
Ι
Switching voltage VDU, VDWL and VDRL
versus temperature Tj
VD
VΙ = 13.5 V
VD = 1.0 V
7
V Ι = 13.5 V
2.4
6
Ι D, wc
5
2.0
4
1.6
3
1.2
2
Ι D, wd
1
0
-40
AED03055
3.2
V
2.8
0
40
80
120
V DU
0.8
V DWL
0.4
V DRL
0
-40
C
0
40
80
Tj
Tj
Output voltage VQ versus
temperature Tj
Output current limit IQ versus
input voltage VI
AED03056
5.2
VQ
120 ˚C 160
AED03057
500
IQ
V
5.1
Tj = 25 ˚C
mA
400
VΙ = 13.5 V
5.0
300
4.9
200
4.8
100
4.7
4.6
-40
0
0
40
80
120 ˚C 160
10
20
30
40 V 50
VI
Tj
Data Sheet
0
12
Rev. 1.5
2018-09-10
OPTIREG™ Linear TLE4278G
5 V low drop fixed voltage regulator
Application information
5
Application information
5.1
Input, output
The input capacitors CI1 and CI2 are necessary for compensating line influences. Using a resistor of
approx. 1 Ω in series with CI1, the LC circuit of input inductance and input capacitance can be damped.
To stabilize the regulation circuit the output capacitor CQ is necessary. Stability is ensured at values CQ ≥ 10 µF
with an ESR ≤ 5 Ω within the operating temperature range.
VΙ
+12 V
C Ι1
CΙ2
13
9
VQ
470 nF
1
TLE 4278G
14
8
3-5,
10-12
GND
6
D
WO
R1
CQ
22 μF
RO
WΙ
RADJ
7
2
WADJ
μP
*)
Cooling
Area
CD
47 nF
R WADJ
R2
*) or short to GND
for internal threshold
Figure 4
Data Sheet
AES02116
Application circuit
13
Rev. 1.5
2018-09-10
OPTIREG™ Linear TLE4278G
5 V low drop fixed voltage regulator
Application information
5.2
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:
CD = (∆trd × ID,c) / ∆V
(5.1)
Definitions:
•
CD = delay capacitor
•
∆trd = delay time
•
ID,c = charge current, typical 5 µA
•
∆V = VDU, typical 1.9 V
•
VDU = upper delay switching threshold at CD for reset delay time
The reset reaction time trr is the time it takes the voltage regulator to set the reset out “low” after the output
voltage has dropped below the reset threshold. It is typically 1 µs for delay capacitor of 47 nF. For other values
for CD the reaction time can be estimated using Equation (5.2):
trr ≈ 20 s/F × CD
(5.2)
VΙ
t
< t rr
VQ
V Q, rt
d V Ι D,c
=
dt
CD
VD
t
V DU
V DRL
VRO
t rd
t rr
t
t
Power-on-Reset
Figure 5
Data Sheet
Thermal
Shutdown
Voltage Dip
at Input
Undervoltage
Secondary
Spike
Overload
at Output
AED03010
Reset timing (watchdog disabled)
14
Rev. 1.5
2018-09-10
OPTIREG™ Linear TLE4278G
5 V low drop fixed voltage regulator
Application information
5.3
Reset switching threshold
The present default value is 4.65 V. When using the TLE4278 the reset threshold can be set to 3.5 V < VQ,rt < 4.6 V
by connecting an external voltage divider to pin RADJ. The calculation can be easily done since the reset adjust
input current can be neglected. If this feature is not needed, the pin must be connected to GND.
VQ,rt = Vref × (1 + R1/R2)
(5.3)
Definitions:
•
VQ,rt = Reset threshold
•
Vref = comparator reference voltage, typical 1.35 V
(Reset adjust input current ≈ 50 nA)
TLE 4278 G
Ι
13
9
Q
30 kΩ
14
RO
Band-GapReference
Band-GapReference
1.35 V
1.35 V
>1
+
-
R1
7
3 ... 5,
RADJ
10 ... 12
GND
R2
AES03071
Figure 6
Reset switching threshold
The reset output pin is internally connected to the 5 V output Q via a 30 kΩ pull-up resistor. Down to an output
voltage VQ of typical 1 V the reset “low” signal at pin RO is generated.
For the timing of the reset feature please refer to Figure 5.
Data Sheet
15
Rev. 1.5
2018-09-10
OPTIREG™ Linear TLE4278G
5 V low drop fixed voltage regulator
Application information
5.4
Watchdog activating
The calculation of the external resistor which adjusts the watchdog switch off threshold can be done by
Equation (5.4):
RWADJ = VWADJ,th × (IQ/IWADJ)/IQ,act
(5.4)
Definitions:
•
VWADJ,th = switch off threshold, typical 1.35 V
•
IQ/IWADJ = current ratio, typical 720
•
IQ,act = switch off load current
TLE 4278 G
Ι
Q
Band-GapReference
HIGH
+
-
WADJ
Watchdog
active
LOW
Watchdog
disabled
R WADJ
GND
AES03072
Figure 7
Data Sheet
Watchdog activating
16
Rev. 1.5
2018-09-10
OPTIREG™ Linear TLE4278G
5 V low drop fixed voltage regulator
Application information
5.5
Watchdog timing
The frequency of the watchdog pulses must be higher than the minimum pulse sequence which is set by the
external reset delay capacitor CD. Calculation can be done according to the formulas given in Figure 8.
The watchdog output is internally connected to the output Q via a 30 kΩ pull-up resistor. To generate a
watchdog created reset signal for the microcontroller the pin WO can be connected to the reset input of the
microcontroller. It is also allowed to parallel the watchdog out to the reset out.
VW Ι
t
VΙ
VQ
t
T WD, p
VD
t
T WI, tr
VDU
VDWL
VWO
T WI, tr =
t WD, L
(VDU - VDWL )
Ι D, wd
C D ; T WD, p =
(VDU -VDWL ) (Ι D, wc + Ι D, wd )
Ι D, wc x Ι D, wd
C D ; t WD, L =
t
(VDU - VDWL )
Ι D, wc
t
CD
AED03099
Figure 8
Data Sheet
Timing of the watchdog function
17
Rev. 1.5
2018-09-10
OPTIREG™ Linear TLE4278G
5 V low drop fixed voltage regulator
Application information
5.6
Hints for unused pins
Table 6
Hints for unused pins
Symbol
Function
Connect to
RO
Reset output
Open
D
Reset delay
Open or to output Q
RADJ
Reset switching threshold adjust
GND
WI
Watchdog input
GND
WO
Watchdog output
Open
WADJ
Watchdog adjust
1)
Data Sheet
To output Q via a 270 kΩ resistor:
Watchdog always active
2)
To GND: Watchdog disabled
18
Rev. 1.5
2018-09-10
OPTIREG™ Linear TLE4278G
5 V low drop fixed voltage regulator
Package information
6
Package information
Figure 9
PG-DSO-14 (Plastic Dual Small Outline) 1)
Green Product (RoHS compliant)
To meet the world-wide customer requirements for environmentally friendly products and to be compliant
with government regulations the device is available as a green product. Green products are RoHS-Compliant
(i.e Pb-free finish on leads and suitable for Pb-free soldering according to IPC/JEDEC J-STD-020).
Further information on packages
https://www.infineon.com/packages
1) Dimension in mm
Data Sheet
19
Rev. 1.5
2018-09-10
OPTIREG™ Linear TLE4278G
5 V low drop fixed voltage regulator
Revision history
7
Revision history
Revision Date
1.5
Data Sheet
Changes
2018-09-10 Updated layout and structure
Updated packaged drawing “PG-DSO-14”
Editorial changes
20
Rev. 1.5
2018-09-10
Trademarks
All referenced product or service names and trademarks are the property of their respective owners.
Edition 2018-09-10
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2018 Infineon Technologies AG.
All Rights Reserved.
Do you have a question about any
aspect of this document?
Email: erratum@infineon.com
Document reference
Z8F55294583
IMPORTANT NOTICE
The information given in this document shall in no
event be regarded as a guarantee of conditions or
characteristics ("Beschaffenheitsgarantie").
With respect to any examples, hints or any typical
values stated herein and/or any information regarding
the application of the product, Infineon Technologies
hereby disclaims any and all warranties and liabilities
of any kind, including without limitation warranties of
non-infringement of intellectual property rights of any
third party.
In addition, any information given in this document is
subject to customer's compliance with its obligations
stated in this document and any applicable legal
requirements, norms and standards concerning
customer's products and any use of the product of
Infineon Technologies in customer's applications.
The data contained in this document is exclusively
intended for technically trained staff. It is the
responsibility of customer's technical departments to
evaluate the suitability of the product for the intended
application and the completeness of the product
information given in this document with respect to
such application.
For further information on technology, delivery terms
and conditions and prices, please contact the nearest
Infineon Technologies Office (www.infineon.com).
WARNINGS
Due to technical requirements products may contain
dangerous substances. For information on the types
in question please contact your nearest Infineon
Technologies office.
Except as otherwise explicitly approved by Infineon
Technologies in a written document signed by
authorized representatives of Infineon Technologies,
Infineon Technologies’ products may not be used in
any applications where a failure of the product or any
consequences of the use thereof can reasonably be
expected to result in personal injury.