Type Package
TLE 4268 GS PG-DSO-8
TLE 4268 G PG-DSO-20
5-V Low Drop Fixed Voltage Regulator
TLE 4268
P-DSO-8-3, -6, -7, -8, -9
P/PG-DSO-20-1,-6,-7,-9,-14,-
Data Sheet 1 Rev. 1.6, 2013-11-25
Features
• Output voltage tolerance ≤ ±2%
• Very low current consumption
• Low-drop voltage
• Watchdog
• Settable reset threshold
• Overtemperature protection
• Reverse polarity protection
• Short-circuit proof
• Suitable for use in automotive electronics
• Wide temperature range
• Green Product (RoHS compliant)
• AEC Qualified
Functional Description
This device is a 5-V low-drop fixed-voltage regulator. The
maximum input voltage is 45 V. It can deliver an output
current of at least 180 mA. The IC is short-circuit proof
and features temperature protection that disables the
circuit in the event of impermissibly high temperatures. The watchdog function is
disabled as a function of the load, so that a controller is not interrupted during sleep
mode by a watchdog reset.
Application Description
The IC regulates an input voltage VI in the range 5.5 V < VI < 45 V to VQ,nom = 5.0 V. In
the event of an output voltage VQ < VRT, a reset signal is generated. The wiring of the
reset switching threshold input enables the value of VRT to be reduced. The reset delay
time can be adjusted using an external capacitor. The integrated watchdog monitors the
connected active controller. If there is no rising edge at the watchdog input, the reset
Data Sheet 2 Rev. 1.6, 2013-11-25
TLE 4268
output is set to low. The reset delay capacitor provides a wide adjustment range for the
pulse repetition time. The watchdog function is only activated if the load exceeds 8 mA.
This ensures that a microcontroller is not activated during power-down and the current
drain is not increased. The IC is protected against overload and overtemperature.
Figure 1 Pin Configuration (top view)
Table 1 Pin Definitions and Functions
Pin Symbol Function
1 I Input voltage
2 N.C. Not connected
3 RO Reset output
4 GND Ground
5 D Reset delay
6 RADJ Reset switching threshold
7 W Watchdog input
8 Q 5 V output voltage
RADJ
W
GND 5
6
7
N.C.
8
4
3
2
1
Ι
AEP01954
Q
RO
D
PG-DSO-8
TLE 4268
Data Sheet 3 Rev. 1.6, 2013-11-25
Figure 2 Pin Configuration (top view)
Table 2 Pin Definitions and Functions
Pin Symbol Function
1, 2, 8, 13,
19, 20
N.C. Not connected.
3ROReset output; the open collector output is connected to the
5-V output via an integrated resistor of 30 kΩ.
4 … 7,
14 … 17
GND Ground
9DReset delay; connect a capacitor to ground for delay time
adjustment.
10 RADJ Reset switching threshold; for setting the switching threshold,
output to ground with voltage divider. If this input is connected
to ground, the reset is triggered at an output voltage of 4.5 V.
11 W Watchdog input; positive-edge-triggered input for monitoring a
microcontroller.
12 Q 5-V output voltage; block to ground with 22 μF capacitor,
ESR < 3 Ω.
18 I Input voltage; block to ground directly on the IC with ceramic
capacitor.
AEP01540
GND
Q
Ι
N.C.
N.C.
13
14
10
15
9
16
8
17
N.C.
7
18
6
19
GND 5
20
4
3
2
1
GNDGND
N.C.
D
11
12
RO
GND
GND
RADJ
GND
GND
W
N.C.
N.C.
PG-DSO-20
Data Sheet 4 Rev. 1.6, 2013-11-25
TLE 4268
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-saturation of the power element. If the externally scaled down
output voltage at the reset threshold input drops below 1.35 V, the external reset delay
capacitor is discharged by the reset generator. If the voltage on the capacitor reaches
the lower threshold VDRL, a reset signal is generated on the reset output and not
cancelled again until the upper threshold voltage is exceeded. If the reset threshold input
is connected to GND, reset is triggered at an output voltage of 4.5 V. A connected
microcontroller is monitored by the watchdog logic. If pulses are missing, the rest output
is set to low. The pulse sequence time can be set within a wide range with the reset delay
capacitor. The IC also incorporates internal circuits for protection against:
• Overload
• Overtemperature
• Reverse polarity
Figure 3 Block Diagram TLE 4268 G (PG-DSO-20)
AEB01539
Temperature
Sensor
-
+
Control
Amplifier
Protection
Circuit
Reference
Bandgap
Adjustment
Generator
Reset
Watchdog
Watchdog
Input
3
12
10
9
Output
Reset
Reset
Reset
Output
Switching
Delay
11
Threshold
18
Input
4-7, 14-17
GND
TLE 4268
Data Sheet 5 Rev. 1.6, 2013-11-25
Table 3 Absolute Maximum Ratings
Parameter Symbol Limit Values Unit Notes
Min. Max.
Input I
Input voltage
Input current
VI
II
-30
–
45
–
V
–
–
Internally limited
Reset Output RO
Voltage
Current
VR
IR
-0.3
–
7
–
V
–
–
Internally limited
Reset Delay D
Voltage
Current
VD
ID
-0.3
–
7
–
V
–
–
Internally limited
Watchdog W
Watchdog input VW-0.3 7 V –
Reset Switching Threshold RADJ
Reset threshold VRADJ -0.3 7 V –
Output Q
Output voltage
Output current
VQ
IQ
-0.3
–
7
–
V
–
–
Internally limited
Ground GND
Current IGND -100 50 mA –
Temperatures
Junction temperature
Storage temperature
Tj
TS
-40
-50
150
150
°C
°C
–
–
Data Sheet 6 Rev. 1.6, 2013-11-25
TLE 4268
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, operation at the maximum permitted
ratings could affect the reliability of the device.
Table 4 Operating Range
Parameter Symbol Limit Values Unit Notes
Min. Max.
Input voltage VI–45V–
Junction temperature Tj-40 150 °C–
Thermal Resistance
Junction ambient (soldered) Rthj-a
Rthj-a
–
–
185
100
K/W
K/W
PG-DSO-81)
PG-DSO-201)
Junction pin Rthj-pin
Rthj-pin
–
–
72
23
K/W
K/W
PG-DSO-82)
PG-DSO-203)
1) Package mounted on PCB 80 × 80 × 1.5 mm3; 35μ Cu; 5μ Sn; Footprint only; zero airflow.
2) Measured to pin 2.
3) Measured to pin 5.
TLE 4268
Data Sheet 7 Rev. 1.6, 2013-11-25
Table 5 Characteristics
VI = 13.5 V; -40 °C ≤ Tj ≤ 125 °C (unless otherwise specified)
Parameter Symbol Limit Values Unit Test Condition
Min. Typ. Max.
Output voltage VQ4.90 5.00 5.10 V 5 mA ≤ IQ ≤ 150 mA;
6 V ≤ VI ≤ 28 V
Output current limiting IQ180 250 – mA –
Current consumption
Iq = II - IQ
Iq– 300 450 μAIQ = 0 mA
Current consumption
Iq = II - IQ
Iq– 1320mAIQ = 150 mA
Drop voltage VDR – 0.25 0.50 V IQ = 150 mA1)
Load regulation ΔVQ,Lo – 1030mVIQ = 5 to 150 mA
Line regulation ΔVQ,Li – 1030mVVI = 6 to 28 V
IQ = 150 mA
Reset Generator
Reset threshold VQ,rt 4.24.54.8V–
Reset adjust
threshold
VRADJ 1.28 1.35 1.45 V –
Reset low voltage VRO,l – 0.2 0.5 V 1 mA external
Saturation voltage VD– 30 100 mV VQ < VRT
Charging current ID,c 51218μAVD = 1.0 V
Upper reset timing
threshold
VDU 1.41.82.2V–
Reset delay time trd 10 15 25 ms CD = 100 nF
Reset reaction time trr –2–μsCD = 100 nF
Pull-up RRO 18 30 46 kΩwith resp. to VQ
Lower reset timing
threshold
VDRL 0.2 0.4 0.55 V –
Data Sheet 8 Rev. 1.6, 2013-11-25
TLE 4268
Note: The reset output is low in range from VQ = 1 V to VQ,rt.
Watchdog
Discharge current ID,d 1.5 3.5 5.2 μAVD = 1.0 V
Charging current ID,c 51218μAVD = 1.0 V
Upper timing
threshold
VDU 1.41.82.2V–
Lower timing
threshold
VDWL 0.2 0.4 0.55 V –
Watchdog period TWP 30 55 75 ms CD = 100 nF
Watchdog trigger time TWT 25 40 60 ms CD = 100 nF
Activating current IQ2 8 15 mA Activates watchdog
Slew rate dVW/dt5––V/μs from 20% up to
80% VQ2)
1) Drop voltage = VI - VQ (measured when the output voltage has dropped 100 mV from the nominal value
obtained at 13.5 V input)
2) Watchdog pulse recognition tested with 10 kHz max. pulse frequency
Table 5 Characteristics (cont’d)
VI = 13.5 V; -40 °C ≤ Tj ≤ 125 °C (unless otherwise specified)
Parameter Symbol Limit Values Unit Test Condition
Min. Typ. Max.
TLE 4268
Data Sheet 9 Rev. 1.6, 2013-11-25
Figure 4 Test Circuit
AES01541
TLE 4268G
1000 Fμ
V
Ι
R
Q
V
Ι
Ι
Ι
d
Ι
M
Ι
Q
CD
100 nF
V
D
Ι
R
22 Fμ
Q
V
-
Ι
VV
Dr =
470 nF
RES
V
V
W
V
Outside the control range
dis
Ι
Ι
W
D GND RADJ
RO
Q
Data Sheet 10 Rev. 1.6, 2013-11-25
TLE 4268
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 = (Δtrd × ID,c)/ΔV(1)
Definitions:
•CD = delay capacitor
•Δtrd = delay time
•ID,c = charge current, typical 12 μA
•ΔV = VDU, typical 1.8 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 the following equation:
trr ≈ 20 s/F × CD(2)
Figure 5 Timing (Watchdog disabled)
AED03010
Thermal
trd
Power-on-Reset Voltage Dip Secondary Overload
at OutputSpike
VΙ
D,c
Ι
=
Vd
dt
VQ
Q, rt
V
trr
<
rr
t
at Input
Undervoltage
Shutdown
CD
t
VRO
D
V
t
t
t
VDU
VDRL
TLE 4268
Data Sheet 11 Rev. 1.6, 2013-11-25
Figure 6 Timing of the Watchdog Function
AED03011_68
W
V
V
V
Q
D
V
V
WO
V
DU
-
V
DWL
()
Ι
(
D, c
+
D, d
)
Ι
Ι
D, c
Ι
x
D, d
T
WP
=
WD, L
t
WP
T
WT
T
WD, L
t
=
VV
(
DU
-
DWL
)
Ι
D, c
T
=
VV
(
DU
-
DWL
)
Ι
D, d
DU
V
V
DWL
Ι
Ι
WT
C
D
;;
D
C
D
C
t
t
t
t
t
Data Sheet 12 Rev. 1.6, 2013-11-25
TLE 4268
Drop Voltage VDR versus
Output Current IQ
Current Consumption Iq
versus Input Voltage VI
Current Consumption Iq
versus Output Current IQ
Output Voltage versus
Input Voltage VI
AED01546
0
0
= 33
Ω
R
I
q
V
4
8
12
16
20
24
10 20 30 40 50
L
I
L
R
Ω
= 50
L
R
Ω
= 100
T
j
= 25 ˚C
mA
V
AED01545
0
0
2
6
10
12
14
Q
I
q
I
V
I
= 13.5 V
16
4
8
T
= 25 ˚C
j
50 100 150 200mA
mA
AED01547
0
0
V
Q
V
2
4
6
8
10
mA
246 8 V
Ι
L
R
Ω
33=
Data Sheet 13 Rev. 1.6, 2013-11-25
TLE 4268
Charge Current ID,c and Discharge
Current ID,d versus Temperature Tj
Output Voltage VQ versus
Temperature Tj
Timing Threshold VDU, VDWL, VDRL
versus Temperature Tj
Output Current IQ versus
Input Voltage VI
AED03102
-40
4.6
V
Q
4.7
4.8
4.9
5.0
5.1
V
04080 120 V
13.5 V
Ι
V=
T
j
AED03101
-40
0
= 13.5 V
V
D
T
V
040
80 120 C
V
Ι
0.4
0.8
1.2
1.6
2.0
2.4
2.8
DU
V
DWL
VV
DRL
j
,
AED01551
0
0
I
Q
50
100
150
200
250
300
10 20 30 40 50
V
I
T
j
= 25 ˚C
mA
V
Data Sheet 14 Rev. 1.6, 2013-11-25
TLE 4268
Package Outlines
Figure 7 PG-DSO-8 (Plastic Dual Small Outline)
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).
1) Does not include plastic or metal protrusion of 0.15 max. per side
-0.06
-0.2
+0.1
5
0.41
8x
1
1)
4
8
1.27
5
A
0.1
0.2 MA
(1.45)
0.175
1.75 MAX.
B
B
6
±0.2
0.64
4
-0.2
0.19
+0.06
0.35 x 45°
1)
±0.25
MAX.8°
Index
Marking
±0.07
2) Lead width can be 0.61 max. in dambar area
GPS01229
You can find all of our packages, sorts of packing and others in our
Infineon Internet Page “Products”: http://www.infineon.com/products.
Dimensions in mm
SMD = Surface Mounted Device
TLE 4268
Data Sheet 15 Rev. 1.6, 2013-11-25
Figure 8 PG-DSO-20 (Plastic Dual Small Outline)
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).
GPS05094
1.27
0.2 20x
0.35
+0.15 2)
12.8
1)
-0.2
110
1120
2.65 MAX.
2.45
20x
0.1
-0.2
0.2
-0.1
Index Marking
1) Does not include plastic or metal protrusion of 0.15 max. per side
2) Does not include dambar protrusion of 0.05 max. per side
0.35 x 45˚
-0.21)
7.6
8˚ MAX.
±0.3
10.3
0.4
+0.8
0.23
+0.09
You can find all of our packages, sorts of packing and others in our
Infineon Internet Page “Products”: http://www.infineon.com/products.
Dimensions in mm
SMD = Surface Mounted Device
Data Sheet 16 Rev. 1.6, 2013-11-25
TLE 4268
Version Date Changes
Rev. 1.6 2013-11-25 Package version changed:
- PG-DSO-20-35 to PG-DSO-20
Package naming harmonized according to Infineon
standards:
- PG-DSO-8-16 to PG-DSO-8
Rev. 1.5 2007-03-20 Initial version of RoHS-compliant derivate of TLE 4268
Page 1: AEC certified statement added
Page 1 and Page 14 RoHS compliance statement and
Green product feature added
Page 1 and Page 14 Package changed to RoHS
compliant version
Legal Disclaimer updated
Edition 2013-11-25
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2013 Infineon Technologies AG
All Rights Reserved.
Legal Disclaimer
The information given in this document shall in no event be regarded as a guarantee of conditions or
characteristics. With respect to any examples or hints given herein, any typical values stated herein and/or any
information regard ing the application of t he device, Infineon Technologies hereby disclaims any and all warranties
and liabilities of any kind, including without limit ation, warranties of non-infringement of intellectual property rights
of any third party.
Information
For further information on technology, delivery terms and conditions and prices, please contact the nearest
Infineon Technologies Office (www.infineon.com).
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