INFINEON TLE4268

5-V Low-Drop Fixed Voltage Regulator
TLE 4268
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
Type
Ordering Code
Package
TLE 4268 GS
Q67006-A9229
P-DSO-8-1 (SMD)
TLE 4268 G
Q67006-A9146
P-DSO-20-6 (SMD)
P-DSO-8-1
P-DSO-20-6
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 Vqrated = 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 positive-going edge at the watchdog input, the
reset 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.
Semiconductor Group
1
1998-11-01
TLE 4268
Pin Configuration
(top view)
P-DSO-8-1
VΙ
N.C.
QRES
GND
1
2
3
4
8
7
6
5
VQ
W
SRES
DRES
AEP01954
Figure 1
Pin Definitions and Functions
Pin
Symbol
Function
1
VI
Input voltage
2
N. C.
Not connected
3
QRES
Reset output
4
GND
Ground
5
DRES
Reset delay
6
SRES
Reset switching threshold
7
W
Watchdog input
8
VQ
5-V output voltage
Semiconductor Group
2
1998-11-01
TLE 4268
Pin Configuration
(top view)
P-DSO-20-6
N.C.
N.C.
QRES
GND
GND
GND
GND
N.C.
DRES
SRES
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
N.C.
N.C.
VΙ
GND
GND
GND
GND
N.C.
VQ
W
AEP01540
Figure 2
Pin Definitions and Functions
Pin
Symbol Function
1, 2, 8, 13, N. C.
19, 20
Not connected.
3
QRES
Reset 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
9
DRES
Reset delay; connect a capacitor to ground for delay time
adjustment.
10
SRES
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
VQ
5-V output voltage; block to ground with 22-µF capacitor,
ESR < 3 Ω.
18
VI
Input voltage; block to ground directly on the IC with ceramic
capacitor.
Semiconductor Group
3
1998-11-01
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 VST, 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 a member of internal circuits for protection against:
• Overload
• Overtemperature
• Reverse polarity
Input
12 Output
18
Temperature
Sensor
Protection
Circuit
3 Reset
Output
Reset
Generator
Control
Amplifier
+
-
Adjustment
Bandgap
Reference
Watchdog
4-7, 14-17
GND
11
Watchdog
Input
Reset
10 Switching
Threshold
9 Reset
Delay
AEB01539
Figure 3
Block Diagram
Semiconductor Group
4
1998-11-01
TLE 4268
Absolute Maximum Ratings
Tj = – 40 to 150 °C
Parameter
Symbol
Limit Values
Unit
Notes
min.
max.
VI
II
– 30
45
VR
IR
– 0.3
VD
ID
– 0.3
VW
– 0.3
7
V
–
VRE
– 0.3
7
V
–
VQ
IQ
– 0.3
7
V
IM
– 100
50
mA
–
°C
°C
–
– 50
150
150
Input
Input voltage
Input current
V
Internally limited
Reset Output
Voltage
Current
7
V
Internally limited
Reset Delay
Voltage
Current
7
V
Internally limited
Watchdog
Watchdog input
Reset Input
Reset threshold
Output
Output voltage
Output current
Internally limited
Ground
Current
Temperatures
Junction temperature
Storage temperature
Semiconductor Group
Tj
TS
5
1998-11-01
TLE 4268
Operating Range
Parameter
Symbol
Input voltage
Junction temperature
Limit Values
Unit
Notes
min.
max.
VI
Tj
–
45
V
–
– 40
150
°C
–
RthjA
RthjA
RthjC
RthjC
–
200
70
K/W
K/W
P-DSO-8-1
P-DSO-20-6
–
60
25
K/W
K/W
P-DSO-8-1
P-DSO-20-6
Thermal Resistance
Junction ambient (soldered)
Junction case
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.
Characteristics
VI = 13.5 V; – 40 °C ≤ Tj ≤ 125 °C (unless otherwise specified)
Parameter
Symbol
Limit Values
min.
typ.
max.
Unit
Test Condition
Output voltage
VQ
4.90
5.00
5.10
V
5 mA ≤ IQ ≤ 150 mA;
6 V ≤ VI ≤ 28 V;
Output current
limiting
IQ
180
250
–
mA
–
Current consumption Iq
Iq = II - IQ
–
300
450
µA
IQ = 0 mA
Current consumption Iq
Iq = II – IQ
–
13
20
mA
IQ = 150 mA
–
0.25
0.5
V
–
10
30
mV
–
10
30
mV
IQ = 150 mA1)
IQ = 5 to 150 mA
VI = 6 to 28 V
IQ = 150 mA
Drop voltage
Load regulation
Supply voltage
regulation
1)
VDR
∆VQ
∆VQ
Drop voltage = VI – VQ (measured when the output voltage has dropped 100 mV from the nominal value
obtained at 13.5 V input)
Semiconductor Group
6
1998-11-01
TLE 4268
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.
VRT
VRE
VR
VC
Id
VDU
4.2
4.5
4.8
V
–
1.28
1.35
1.45
V
–
–
0.2
0.5
V
1 mA extern
–
30
100
mV
5
12
18
µA
VQ < VRT
VC = 1.0 V
1.4
1.8
2.2
V
–
td
tt
RR
VDRL
10
15
25
ms
–
2
–
µs
Cd = 100 nF
Cd = 100 nF
18
30
46
kΩ
with resp. to VQ
0.2
0.4
0.55
V
–
ICd
Id
VCd
VDWL
1.5
3.5
5.2
µA
5
12
18
µA
VC = 1.0 V
VC = 1.0 V
1.6
1.8
2.0
V
–
0.2
0.4
0.55
V
–
TWP
TWT
30
55
75
ms
25
40
60
ms
Cd = 100 nF
Cd = 100 nF
IQ
VW
2
8
15
mA
Activates watchdog
5
–
–
V/µs
from 20 % up to
80 % VQ
Reset Generator
Switching threshold
Switching voltage
Saturation voltage
Saturation voltage
Charging current
Delay switching
threshold
Delay time
Delay time
Pull-up
Lower switching
threshold
Watchdog
Discharge current
Charging current
Switching voltage
Lower switching
threshold
Watchdog periode
Watchdog trigger
time
Activating current
Slew rate
Note: The reset output is low in range from VQ = 1 V to VRT.
Semiconductor Group
7
1998-11-01
TLE 4268
ΙQ
ΙΙ
1000 µ F
22 µF
470 nF
TLE 4268G
ΙR
VΙ
Ι Cd
VW
VC
VQ
VR
ΙM
Ιd
VRE
Cd
100 nF
AES01541
VDr = VΙ -VQ Outside the control range
Figure 4
Test Circuit
VΙ
< t RR
V RT
VQ
dV Ι d
=
dt C D
VDT
VST
VD
td
t RR
V RO
Power-on-Reset
Thermal
Shutdown
Voltage Dip
at Input
Undervoltage
Secondary
Spike
Overload
at Output
AED01542
Figure 5
Timing (Watchdog Disabled)
Semiconductor Group
8
1998-11-01
TLE 4268
VW Ι
VΙ
T WP
VQ
T WT
VDU
VD
VDWL
t WR
VWO
T WP =
(VDU - VDWL ) (Ι d + Ι dis )
Ι d x Ι dis
C D;
t WR =
VDUL = VDRL
(VDU - VDWL )
Ιd
C D;
T WT =
(VDU - VDWL )
Ι dis
CD
AED01543
Figure 6
Timing of the Watchdog Function
Semiconductor Group
9
1998-11-01
TLE 4268
Drop Voltage VDr versus
Output Current IQ
Current Consumption Iq
versus Output Current IQ
AED01544
mV
Ιq
V DR
AED01545
mA
700
14
600
12
500
10
400
8
V Ι =13.5 V
Tj = 25 C
Tj = 125 C
300
6
Tj = 25 C
200
4
100
2
0
0
50
100
150
200
250
0
mA
0
50
100
150
200
250
ΙQ
ΙQ
Current Consumption Iq
versus Input Voltage Vi
Output Voltage versus
Input Voltage Vi
AED01546
mA
Ιq
mA
AED01547
mA
VQ
Tj = 25 C
10
10
8
8
R L= 33 Ω
6
6
R L= 33 Ω
4
4
R L= 50 Ω
2
0
2
R L= 100 Ω
0
10
20
30
40
0
V
2
4
6
8
V
VΙ
VΙ
Semiconductor Group
0
10
1998-11-01
TLE 4268
Charge Current Id and Discharge
Current Icd versus Temperature Tj
Switching Voltage VCd
and VST versus Temperature Tj
AED01548
µA
Ι
VD
VΙ = 13.5 V
VD = 1.0 V
7
2.8
V Ι = 13.5 V
2.4
6
Ιd
5
1.6
3
1.2
2
Ι dis
1
0
V DU
2.0
4
0
-40
AED01549
V
40
80
120
0.8
V DWL
0.4
V DRL
0
-40
C
0
40
80
120
Tj
Tj
Output Voltage VQ versus
Temperature Tj
Output Current IQ versus
Input Voltage Vi
AED01550
V
C
AED01551
mA
ΙQ
VQ
Tj = 25 C
250
5.1
VΙ = 13.5 V
5.0
200
4.9
150
4.8
100
4.7
50
4.6
-40
0
0
40
80
120
V
10
20
30
40
V
Vj
Tj
Semiconductor Group
0
11
1998-11-01
TLE 4268
Package Outlines
GPS05121
P-DSO-8-1
(Plastic Dual Small Outline)
Sorts of Packing
Package outlines for tubes, trays etc. are contained in our
Data Book “Package Information”.
SMD = Surface Mounted Device
Semiconductor Group
12
Dimensions in mm
1998-11-01
TLE 4268
Package Outlines (cont’d)
1.27
0.35 x 45˚
7.6 -0.2 1)
0.23 +0.0
9
8˚ ma
x
2.65 max
2.45 -0.2
0.2 -0.1
P-DSO-20-6
(Plastic Dual Small Outline)
0.4 +0.8
0.35 +0.15 2)
0.2 24x
20
10.3 ±0.3
0.1
11
GPS05094
1 12.8 1) 10
-0.2
Index Marking
1) Does not include plastic or metal protrusions of 0.15 max per side
2) Does not include dambar protrusion of 0.05 max per side
Sorts of Packing
Package outlines for tubes, trays etc. are contained in our
Data Book “Package Information”.
SMD = Surface Mounted Device
Semiconductor Group
13
Dimensions in mm
1998-11-01