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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
P-DSO-8-1
Type TLE 4268 GS TLE 4268 G
Ordering Code Q67006-A9229 Q67006-A9146
Package P-DSO-8-1 (SMD) P-DSO-20-6 (SMD) 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
V N.C. QRES GND
1 2 3 4
8 7 6 5
AEP01954
VQ W SRES DRES
Figure 1
Pin Definitions and Functions Pin 1 2 3 4 5 6 7 8 Symbol Function Input voltage Not connected Reset output Ground Reset delay Reset switching threshold Watchdog input 5-V output voltage
VI
N. C. QRES GND DRES SRES W
VQ
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
AEP01540
N.C. N.C. V GND GND GND GND N.C. VQ W
Figure 2
Pin Definitions and Functions Pin Symbol Function Not connected. Reset output; the open collector output is connected to the 5-V output via an integrated resistor of 30 k. Ground Reset delay; connect a capacitor to ground for delay time adjustment. 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. Watchdog input; positive-edge-triggered input for monitoring a microcontroller. 5-V output voltage; block to ground with 22-F capacitor, ESR < 3 . Input voltage; block to ground directly on the IC with ceramic capacitor.
3 1998-11-01
1, 2, 8, 13, N. C. 19, 20 3 4 ... 7, 14 ... 17 9 10 QRES GND DRES SRES
11 12 18
W
VQ VI
Semiconductor Group
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
18
12 Output
Temperature Sensor
Protection Circuit Reset Generator Control Amplifier
+ -
3 Reset Output Reset 10 Switching Threshold 9 Reset Delay
Adjustment
Bandgap Reference
Watchdog
4-7, 14-17 GND
11 Watchdog Input
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 min. Input Input voltage Input current Reset Output Voltage Current Reset Delay Voltage Current Watchdog Watchdog input Reset Input Reset threshold Output Output voltage Output current Ground Current Temperatures Junction temperature Storage temperature max. Unit Notes
VI II
- 30
45
V Internally limited
VR IR
- 0.3
7
V Internally limited
VD ID
- 0.3
7
V Internally limited
VW
- 0.3
7
V
-
VRE
- 0.3
7
V
-
VQ IQ
- 0.3
7
V Internally limited
IM
- 100
50
mA
-
Tj TS
- 50
150 150
C C
-
Semiconductor Group
5
1998-11-01
TLE 4268
Operating Range Parameter Input voltage Junction temperature Thermal Resistance Junction ambient (soldered) Junction case Symbol Limit Values min. max. 45 150 V C - - - - 40 Unit Notes
VI Tj
RthjA RthjA RthjC RthjC
- -
200 70 60 25
K/W K/W K/W K/W
P-DSO-8-1 P-DSO-20-6 P-DSO-8-1 P-DSO-20-6
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 Output voltage Output current limiting Symbol min. Limit Values typ. 5.00 250 300 13 0.25 10 10 max. 5.10 - 450 20 0.5 30 30 V mA A mA V mV mV 5 mA IQ 150 mA; 6 V VI 28 V; - 4.90 180 - - - - - Unit Test Condition
VQ IQ
Current consumption Iq Iq = II - IQ Current consumption Iq Iq = II - IQ Drop voltage Load regulation Supply voltage regulation
1)
IQ = 0 mA IQ = 150 mA IQ = 150 mA1) IQ = 5 to 150 mA VI = 6 to 28 V IQ = 150 mA
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 min. 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 Limit Values typ. max. Unit Test Condition
VRT VRE VR VC Id VDU td tt RR VDRL
4.2 1.28 - - 5 1.4 10 - 18 0.2
4.5 1.35 0.2 30 12 1.8 15 2 30 0.4
4.8 1.45 0.5 100 18 2.2 25 - 46 0.55
V V V mV A V ms s k V
- - 1 mA extern
VQ < VRT VC = 1.0 V
-
Cd = 100 nF Cd = 100 nF
with resp. to VQ -
ICd Id VCd VDWL TWP TWT IQ VW
1.5 5 1.6 0.2 30 25 2 5
3.5 12 1.8 0.4 55 40 8 -
5.2 18 2.0 0.55 75 60 15 -
A A V V ms ms mA V/s
VC = 1.0 V VC = 1.0 V
- -
Cd = 100 nF Cd = 100 nF
Activates watchdog from 20 % up to 80 % VQ
Note: The reset output is low in range from VQ = 1 V to VRT.
Semiconductor Group
7
1998-11-01
TLE 4268
1000 F 470 nF
Q
22 F
TLE 4268G
V VW VC
R Cd d
Cd 100 nF
VQ VR
M
VRE
AES01541
VDr = V -VQ Outside the control range
Figure 4 Test Circuit
V
< t RR
V RT VQ
dV 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
V T WP VQ VDU VD VDWL VWO T WP =
(VDU -VDWL ) ( d + dis )
T WT
t WR
d x dis
C D;
t WR =
(VDU - VDWL )
d
C D;
T WT =
(VDU - VDWL )
dis
CD
VDUL = VDRL
AED01543
Figure 6 Timing of the Watchdog Function
Semiconductor Group 9 1998-11-01
TLE 4268
Drop Voltage VDr versus Output Current IQ
mV
AED01544
Current Consumption Iq versus Output Current IQ
mA 14 12 10 8
AED01545
V DR
700 600 500 400
q
V =13.5 V
Tj = 25 C
Tj = 125 C
300 6
Tj = 25 C
200 100 0 4 2 0
0
50
100
150
200
250
mA
0
50
100
150
200
250
mA
Q
Q
Current Consumption Iq versus Input Voltage Vi
mA
AED01546
Output Voltage versus Input Voltage Vi
mA
AED01547
q
10
Tj = 25 C
VQ
10
8
8
R L= 33
6
6
R L= 33
4
4
R L= 50
2
R L= 100
0 10 20 30 40 V
2
0
0
0
2
4
6
8
V
V
V
Semiconductor Group
10
1998-11-01
TLE 4268
Charge Current Id and Discharge Current Icd versus Temperature Tj
A
AED01548
Switching Voltage VCd and VST versus Temperature Tj
V
AED01549
7 6 5 4 3 2 1 0 -40
V = 13.5 V VD = 1.0 V
VD
2.8
V = 13.5 V
2.4
d
2.0 1.6 1.2 0.8 0.4 0 -40
V DU
dis
V DWL V DRL
0
40
80
120
C
0
40
80
120
C
Tj
Tj
Output Voltage VQ versus Temperature Tj
V
AED01550
Output Current IQ versus Input Voltage Vi
mA
AED01551
VQ
5.1
Q
250
Tj = 25 C
V = 13.5 V
5.0
200
4.9
150
4.8
100
4.7
50
4.6 -40
0
0 40 80 120 V
0
10
20
30
40
V
Tj
Vj
Semiconductor Group
11
1998-11-01
TLE 4268
Package Outlines 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
GPS05121
TLE 4268
Package Outlines (cont'd) P-DSO-20-6 (Plastic Dual Small Outline)
2.65 max
0.35 x 45
2.45 -0.2
0.2 -0.1
1.27 0.35 +0.15 2) 20 0.2 24x 11 0.1
0.4 +0.8 10.3 0.3
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
0.23 +0.0 9 8 ma x
7.6 -0.2 1)
Dimensions in mm 1998-11-01

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