TLE4678-2EL
Low Drop Out Linear Voltage Regulator
5 V Fixed Output Voltage
TLE4678-2EL
Data Sheet
Rev. 1.0, 2014-05-07
Automotive Power
TLE4678-2EL
Table of Contents
Table of Contents
1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
3.1
Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin Configuration PG-SSOP14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
4.1
4.2
4.3
General Product Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
5.1
5.2
5.3
Voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Description Voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical Characteristics Voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Typical Performance Characteristics Voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6
6.1
6.2
Current Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Electrical Characteristics Current Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Typical Performance Characteristics Current Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7
7.1
7.2
7.3
Reset Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Description Reset Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics Reset Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Performance Characteristics Reset Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16
16
19
21
8
8.1
8.2
8.3
Watchdog Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics Watchdog Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Performance Characteristics Standard Watchdog Function . . . . . . . . . . . . . . . . . . . . . . . . .
22
22
25
27
9
9.1
9.2
9.3
9.4
9.5
Application Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Application Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Selection of External Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reverse Polarity Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Further Application Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
28
28
28
29
30
30
10
Package Outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
11
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Data Sheet
2
7
7
8
8
Rev. 1.0, 2014-05-07
Low Drop Out Linear Voltage Regulator5 V Fixed
Output Voltage
1
TLE4678-2EL
Overview
Features
•
Output Voltage 5 V ± 2%
•
Current Capability 200 mA
•
Ultra Low Current Consumption
•
Very Low Drop Out Voltage
•
Watchdog Circuit for Monitoring a Microprocessor
with Programmable Load-dependent Activating Threshold
•
Reset Circuit Sensing the Output Voltage
with Programmable Switching Threshold and Delay Time
•
Reset Output Active Low Down to VQ = 1 V
•
Separated Reset and Watchdog Output
•
Excellent Line Transient Robustness
•
Maximum Input Voltage -14 V ≤ VI ≤ +45 V
•
Reverse Polarity Protection
•
Short Circuit Protected
•
Overtemperature Shutdown
•
Automotive Temperature Range -40 °C ≤ Tj ≤ 150°C
•
Available in a small thermally enhanced PG-SSOP14 package
•
Green Product (RoHS Compliant)
•
AEC Qualified
PG-SSOP14
Description
The TLE4678-2EL is a monolithic integrated low drop out fixed output voltage regulator for loads up to 200 mA.
An input voltage of up to 45 V is regulated to an output voltage of 5 V. The integrated reset and watchdog function,
as well as several protection circuits, combined with a wide operating temperature range offered by the TLE46782EL make it suitable for supplying microprocessor systems in automotive environments.
The watchdog circuitry will be disabled in case the output current drops below a programmable threshold, enabling
a microcontroller to switch in stand-by mode. Modifying the reset threshold is possible by an optional resistor
divider.
The TLE4678-2EL is placed inside the PG-SSOP14 package, and is pin to pin compatible with the TLE4678EL.
Type
Package
Marking
TLE4678-2EL
PG-SSOP14
46782EL
Data Sheet
3
Rev. 1.0, 2014-05-07
TLE4678-2EL
Block Diagram
2
Block Diagram
For details on the circuit blocks see the respective section in this data sheet.
TLE4678-2
I
Q
Regulated Output Voltage
CQ
RO
Protection
Circuits
Bandgap
Reference
WO
Reset
and
Watchdog
Generator
WI
RADJ
WADJ
GND
Load
e. g.
Micro
Controller
XC22 xx
GND
BlockDiagr am_AppCir cuit1.vsd
Supply
D
CD
Figure 1
Data Sheet
Block Diagram and Simplified Application Circuit
4
Rev. 1.0, 2014-05-07
TLE4678-2EL
Pin Configuration
3
Pin Configuration
3.1
Pin Configuration PG-SSOP14
3.1.1
Pin Assignment
WO
n.c.
WADJ
GND
D
n.c.
RADJ
1
2
3
4
5
6
7
14
13
12
11
10
9
8
RO
n.c.
I
n.c.
Q
n.c.
WI
Pinout_SSOP14.vsd
Figure 2
Pin Assignment PG-SSOP14 Package
3.1.2
Pin Definitions and Functions PG-SSOP14
Pin
Symbol
Function
1
WO
Watchdog Output
Open collector output with an internal pull-up resistor to the output Q.
An additional external pull-up resistor to the output Q is optional.
Leave open if the watchdog function is not needed.
3
WADJ
Watchdog Activating Threshold Adjust
An external resistor to GND determines the watchdog activating threshold.
Connect directly to GND for disabling the watchdog.
Connect directly to GND if the watchdog function is not needed.
Connect to output Q via 270 kΩ resistor for permanently activating the watchdog.
4
GND
IC Ground
Interconnect with the exposed pad and heatsink area on PCB.
5
D
Reset Delay and Watchdog Timing
Connect a ceramic capacitor D (pin 6) to GND for reset delay and watchdog timing
adjustment.
Leave only open if both, the reset and the watchdog function are not needed.
7
RADJ
Reset Switching Threshold Adjust
For reset threshold adjustment connect to a voltage divider from output Q to GND.
For triggering the reset at the internally determined threshold, connect this pin directly to
GND.
Connect directly to GND if the reset function is not needed.
Data Sheet
5
Rev. 1.0, 2014-05-07
TLE4678-2EL
Pin Configuration
Pin
Symbol
Function
8
WI
Watchdog Input
Positive edge triggered input, usable for microcontroller monitoring.
Connect to GND if the watchdog function is not needed.
10
Q
5 V Regulator Output
Block to GND with a capacitor close to the IC pins, respecting capacitance and ESR
requirements given in the Chapter 4.2.
12
I
Regulator Input and IC Supply
For compensating line influences, a capacitor to GND close to the IC pins is
recommended.
14
RO
Reset Output
Open collector output with an internal pull-up resistor to the output Q.
An additional external pull-up resistor to the output Q is optional.
Leave open if the reset function is not needed.
2, 6, 9,
11, 13,
n. c.
Internally not connected
Connection to GND on PCB recommended.
Exposed pad
Data Sheet
Connect to heat sink area on PCB. Interconnect with GND.
6
Rev. 1.0, 2014-05-07
TLE4678-2EL
General Product Characteristics
4
General Product Characteristics
4.1
Absolute Maximum Ratings
Note: Stresses above the ones listed here may cause permanent damage to the device. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
1. Integrated protection functions are designed to prevent IC destruction under fault conditions described in the
data sheet. Fault conditions are considered as “outside” normal operating range. Protection functions are not
designed for continuous repetitive operation.
Table 1
Absolute Maximum Ratings1)
Tj = -40°C to +150 °C; all voltages with respect to ground, positive current flowing into pin
(unless otherwise specified)
Parameter
Symbol
Values
Min.
Typ.
Max.
Unit
Note / Test Condition
Number
Voltage Rating
Regulator Input and IC Supply I VI
-14
–
45
V
–
P_4.1.1
VQ
VRO
VD
-1
–
7
V
–
P_4.1.2
-0.3
–
7
V
–
P_4.1.3
-0.3
–
7
V
–
P_4.1.4
Reset Switching Threshold
Adjust RADJ
VRADJ
-0.3
–
7
V
–
P_4.1.5
Watchdog Input WI
VWI
VWO
VWADJ
-0.3
–
7
V
–
P_4.1.6
-0.3
–
7
V
–
P_4.1.7
-0.3
–
7
V
–
P_4.1.8
Tj
Tstg
-40
–
150
°C
–
P_4.1.9
-55
–
150
°C
–
P_4.1.10
-3
–
3
kV
HBM2); Pin 12 (Input) only.
ESD Susceptibility
VESD,12
VESD
-2
–
2
kV
HBM
P_4.1.12
All pins except pin 12 (Input)
ESD Susceptibility all pins
VESD
-1
–
1
kV
CDM3)
Regulator Output Q
Reset Output RO
Reset Delay and Watchdog
Timing D
Watchdog Output WO
Watchdog Activating
Threshold Adjust WADJ
Temperature
Junction Temperature
Storage Temperature
ESD Susceptibility
ESD Susceptibility
P_4.1.11
2)
P_4.1.13
1) Not subject to production test, specified by design.
2) ESD susceptibility, HBM according to ANSI/ESDA/JEDEC JS001 (1.5k Ω, 100 pF)
3) ESD susceptibility, Charged Device Model “CDM” according JEDEC JESD22-C101.
Note: Stresses above the ones listed here may cause permanent damage to the device. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Integrated protection functions are designed to prevent IC destruction under fault conditions described in the
data sheet. Fault conditions are considered as “outside” normal operating range. Protection functions are
not designed for continuous repetitive operation.
Data Sheet
7
Rev. 1.0, 2014-05-07
TLE4678-2EL
General Product Characteristics
4.2
Functional Range
Table 2
Functional Range
Parameter
Symbol
Values
Unit
Note / Test Condition
Number
Input Voltage Range for
Normal Operation
VI(nor)
VQ + Vdr –
45
V
1)
P_4.2.1
Extended Input Voltage
Range
VI(ext)
3.3
–
45
V
2)
P_4.2.2
Input Voltage Transient
Immunity
dVI/dt
-10
–
20
V/µs
dVI ≤ 10 V; VI > 9 V;
P_4.2.3
No trigger of WO, RO. 3)
Junction Temperature
Tj
CQ
-40
–
150
°C
–
10
–
–
ESRCQ
–
–
3
Min.
Output Capacitor
Requirements
Output Capacitor
Requirements
Typ.
Max.
P_4.2.4
µF
4)
–
P_4.2.5
Ω
–5)
P_4.2.6
1) For specification of the output voltage VQ and the drop out voltage Vdr, see Chapter 5.
2) The output voltage VQ will follow the input voltage, but is outside the specified range.
For details see Chapter 5.
3) Transient measured directly at the input pin. Not subject to production test, specified by design.
4) The minimum output capacitance requirement is applicable for a worst case capacitance tolerance of 30%.
5) Relevant ESR value at f = 10 kHz.
Note: Within the functional range the IC operates as described in the circuit description. The electrical
characteristics are specified within the conditions given in the related electrical characteristics table.
4.3
Thermal Resistance
Note: This thermal data was generated in accordance with JEDEC JESD51 standards. For more information, go
to www.jedec.org.
Table 3
Thermal Resistance
Parameter
Symbol
Values
Min.
Typ.
Max.
15
–
Unit
Note / Test Condition
Number
K/W
–
P_4.3.1
TLE4678-2EL (Package Versions PG-SSOP14)
Junction to Case1)
–
Junction to Ambient
RthJC
RthJA
RthJA
Junction to Ambient
Junction to Ambient
Junction to Ambient
2)
–
153
–
K/W
footprint only
–
70
–
K/W
300 mm2 heatsink area P_4.3.3
on PCB 2)
P_4.3.2
RthJA
–
60
–
K/W
600 mm2 heatsink area P_4.3.4
on PCB 2)
RthJA
–
52
–
K/W
2s2p PCB 2)
P_4.3.5
1) Not subject to production test, specified by design
2) Specified RthJA value is according to JEDEC JESD51-2,-5,-7 at natural convection on FR4 2s2p board; The Product
(Chip+Package) was simulated on a 76.2 x 114.3 x 1.5 mm³ board with 2 inner copper layers (2 x 70µm Cu, 2 x 35µm Cu).
Where applicable a thermal via array under the exposed pad contacted the first inner copper layer.
Data Sheet
8
Rev. 1.0, 2014-05-07
TLE4678-2EL
Voltage Regulator
5
Voltage Regulator
5.1
Description Voltage Regulator
The output voltage VQ is controlled by comparing a portion of it to an internal reference and driving a PNP pass
transistor accordingly. Saturation control as a function of the load current prevents any oversaturation of the pass
element. The control loop stability depends on the output capacitor CQ, the load current, the chip temperature and
the poles/zeros introduced by the integrated circuit. To ensure stable operation, the output capacitor’s capacitance
and its equivalent series resistor ESR requirements given in the chapter Chapter 4.2 have to be maintained. For
details see also the typical performance graph “Output Capacitor Series Resistor ESRCQ vs. Output Current IQ”.
Also, the output capacitor shall be sized to buffer load transients.
An input capacitor CI is not needed for the control loop stability, but recommended to buffer line influences.
Connect the capacitors close to the IC terminals.
Protection circuitry prevent the IC as well as the application from destruction in case of catastrophic events. These
safeguards contain output current limitation, reverse polarity protection as well as thermal shutdown in case of
overtemperature.
In order to avoid excessive power dissipation that could never be handled by the pass element and the package,
the maximum output current is decreased at input voltages above VI = 22 V.
The thermal shutdown circuit prevents the IC from immediate destruction under fault conditions (e.g. output
continuously short-circuited) by switching off the power stage. After the chip has cooled down, the regulator
restarts. This leads to an oscillatory behavior of the output voltage until the fault is removed. However, a junction
temperature above 150 °C is outside the maximum rating and therefore reduces the IC lifetime.
The TLE4678-2EL allows a negative supply voltage. However, several small currents are flowing into the IC
increasing its junction temperature. This has to be considered for the thermal design, respecting that the thermal
protection circuit is not operating during reverse polarity condition.
II
Supply
I
Q
Regulated
Output Voltage
IQ
Saturation Control
Current Limitation
VI
CI
Bandgap
Reference
Temperature
Shutdown
V
VQ,nom
VI(ext),min
Data Sheet
LOAD
ESR
GND
Block Diagram Voltage Regulator Circuit
VI
Vdr
VQ
dVQ
Iload
≈
CQ
dt
Diagram_Output-InputVoltage.svg
Figure 4
VQ
CQ
BlockDiagram_VoltageRegulator.vsd
Figure 3
C
dVQ
IQ,max - Iload
≈
CQ
dt
t
Output Voltage vs. Input Voltage
9
Rev. 1.0, 2014-05-07
TLE4678-2EL
Voltage Regulator
5.2
Electrical Characteristics Voltage Regulator
Table 4
Electrical Characteristics: Voltage Regulator
VI = 13.5 V, Tj = -40°C to +150 °C,
all voltages with respect to ground, direction of currents as shown in Figure 3 (unless otherwise specified)
Parameter
Symbol
Values
Min.
Typ.
Max.
Unit
Note / Test Condition
Number
Output Voltage
VQ
4.9
5.0
5.1
V
0 mA ≤ IQ ≤ 200 mA;
8 V ≤ VI ≤ 18 V
P_5.2.1
Output Voltage
VQ
4.9
5.0
5.1
V
0 mA ≤ IQ ≤ 150 mA;
6 V ≤ VI ≤ 18 V
P_5.2.2
Output Voltage
VQ
4.9
5.0
5.1
V
0 mA ≤ IQ ≤ 100 mA;
18 V ≤ VI ≤ 32 V
Tj ≤ 105 °C 1) 2)
P_5.2.3
Output Voltage
VQ
4.9
5.0
5.1
V
0 mA ≤ IQ ≤ 10 mA;
32 V ≤ VI ≤ 45 V
Tj ≤ 105 °C 1) 2)
P_5.2.4
Output Voltage
VQ
4.9
5.0
5.1
V
0.3 mA ≤ IQ ≤ 100 mA; P_5.2.5
18 V ≤ VI ≤ 32 V 1)
Output Voltage
VQ
4.9
5.0
5.1
V
0.3 mA ≤ IQ ≤ 10 mA;
32 V ≤ VI ≤ 45 V 1)
P_5.2.6
Load Regulation
steady-state
|dVQ,load| –
5
30
mV
P_5.2.7
Line Regulation
steady-state
|dVQ,line| –
5
20
mV
Power Supply Ripple Rejection PSRR
60
65
–
dB
Drop out VoltageVdr = VI - VQ
Vdr
Vdr
IQ,max
IQ
II
–
80
170
mV
–
120
300
mV
201
350
500
mA
-1.5
-0.7
–
mA
-2
-1
–
mA
IQ = 1 mA to 150 mA;
VI = 6 V
VI = 6 V to 32 V;
IQ = 5 mA
fripple = 100 Hz;
Vripple = 1 Vpp 2)
IQ = 50 mA 3)
IQ = 150 mA 3)
0 V ≤ VQ ≤ 4.8 V
VI = 0 V; VQ = 5 V
VI = -14 V; VQ = 0 V
Overtemperature Shutdown
Threshold
Tj,sd
151
–
200
°C
Tj increasing 2)
P_5.2.15
Overtemperature Shutdown
Threshold Hysteresis
Tj,hy
–
20
–
K
Tj decreasing 2)
P_5.2.16
Drop out VoltageVdr = VI - VQ
Output Current Limitation
Reverse Current
Reverse Current
at Negative Input Voltage
P_5.2.8
P_5.2.9
P_5.2.10
P_5.2.11
P_5.2.12
P_5.2.13
P_5.2.14
1) See typical performance graph for details.
2) Parameter not subject to production test; specified by design.
3) Measured when the output voltage VQ has dropped 100 mV from its nominal value.
Data Sheet
10
Rev. 1.0, 2014-05-07
TLE4678-2EL
Voltage Regulator
5.3
Typical Performance Characteristics Voltage Regulator
Output Voltage VQ versus
Junction Temperature Tj
Output Current Limitation IQmax versus
Input Voltage VI
5.08
VI = 13.5 V
IQ = 100 mA
5.06
500
5.04
400
Tj = -40 °C
IQ,max [mA]
VQ [V]
5.02
5.00
4.98
T j = 25 °C
300
Tj = 150 °C
200
4.96
100
4.94
4.92
0
-40
0
40
80
120
160
Tj [°C]
0
10
20
30
40
VI [V]
Dropout Voltage Vdr versus
Output Current IQ
Dropout Voltage Vdr versus
Junction Temperature Tj
300
300
250
250
200
200
Tj = 150 °C
Tj = 25 °C
VDR [mV]
VDR [mV]
IQ = 150 mA
150
IQ = 50 mA
100
50
150
Tj = - 40 °C
100
50
IQ = 0.2 mA
0
0
-40
0
40
80
120
160
0
Tj [°C]
Data Sheet
50
100
150
200
IQ [mA]
11
Rev. 1.0, 2014-05-07
TLE4678-2EL
Voltage Regulator
Reverse Output Current IQ versus
Output Voltage VQ
Output Capacitor Series Resistor ESRCQ versus
Output Current IQ
0
100
CQ = 10 µF
Tj = 25° C
VI = 6..28 V
VI = 0V
-0.25
Unstable
Region
-0.5
10
Tj = -40 °C
-0.75
ESR(CQ) [Ω ]
-1.25
T j = 25 °C
ΙQ
[mA]
-1
-1.5
Tj = 150 °C
1
Stable
Region
-1.75
0.1
-2
-2.25
-2.5
0.01
0
1
2
3
4
5
6
V Q [V]
Reverse Current II versus
Input Voltage VI
0
50
100
150
200
IQ [mA]
Power Supply Ripple Rejection PSRR versus
Frequency f
0
90
IQ = 10 mA
CQ = 10 µF
VI = 13.5 V
Vripple = 1 Vpp
Tj = 25 °C
80
VQ = 0V
-0.2
70
60
-0.4
PSRR [dB]
ΙI
[mA]
Tj = -40 °C
Tj = 150 °C
-0.6
50
40
30
‐ ‐ ‐ Tj = 25 °C
20
-0.8
10
-1
-14
-10.5
-7
-3.5
0
0.01
0
V I [V]
Data Sheet
0.1
1
10
100
1000
f [kHz]
12
Rev. 1.0, 2014-05-07
TLE4678-2EL
Voltage Regulator
Output Voltage ΔVQ versus
Output Current IQ
Output Voltage ∆VQ versus
Input Voltage VI
10
16
VI = 6 V
IQ = 5 mA
14
7.5
12
5
10
Δ VQ [mV]
Δ VQ [mV]
Tj = 150 °C
8
6
Tj = 150 °C
2.5
Tj = 25 °C
0
4
Tj = -40 °C
Tj = 25 °C
-2.5
2
Tj = -40 °C
0
0
50
100
150
IQ [mA]
0
8
16
24
32
40
VI [V]
Line Transient Response
Load Transient Response
200
100
VI = 6 V
CQ = 10 µF
Tj = 25° C
IQ = 5 mA
CQ = 10 µF
Tj = 25° C
50
Δ VQ [mV]
100
Δ VQ [mV]
-5
200
0
-100
-200
0
-50
-100
35
200
VI = 6 .. 32 V
IQ = 1 .. 150 mA
150
25
VI [V]
IQ [mA]
100
50
15
5
0
0
200
400
600
800
1000
1200
-50
1400
150
250
350
450
t [us]
t [us]
Data Sheet
50
13
Rev. 1.0, 2014-05-07
TLE4678-2EL
Current Consumption
6
Current Consumption
6.1
Electrical Characteristics Current Consumption
Table 5
Electrical Characteristics: Current Consumption
VI = 13.5 V, Tj = -40°C to +150 °C,
all voltages with respect to ground, direction of currents as shown in Figure 5 (unless otherwise specified).
Parameter
Symbol
Values
Min.
Typ.
Max.
Unit
Note / Test Condition
Number
Current Consumption
Watchdog Deactivated
Iq = II - IQ
Iq1
–
60
80
µA
IQ ≤ 200 µA; Tj ≤ 25 °C
Watchdog deactivated
P_6.1.1
Current Consumption
Watchdog Deactivated
Iq = II - IQ
Iq1
–
70
85
µA
IQ ≤ 200 µA; Tj ≤ 85 °C
Watchdog deactivated
P_6.1.2
Current Consumption
Iq = II - IQ
Iq2
–
110
140
µA
IQ ≤ 2 mA; Tj ≤ 25 °C
Watchdog activated
P_6.1.3
Current Consumption
Iq = II - IQ
Iq2
–
120
155
µA
IQ ≤ 2 mA; Tj ≤ 85 °C
Watchdog activated
P_6.1.4
Current Consumption
Iq = II - IQ
Iq2
–
0.6
1.6
mA
IQ = 50 mA
P_6.1.5
Current Consumption
Iq = II - IQ
Iq2
–
2
6
mA
IQ = 150 mA
P_6.1.6
II
Supply
I
Q
IQ
Voltage Regulator
+
+
VI
CQ
CI
CurrentConsumption _ ParameterDefinition .vsd
Regulated
Output Voltage
VQ
LOAD
GND
Iq
Figure 5
Data Sheet
Parameter Definition
14
Rev. 1.0, 2014-05-07
TLE4678-2EL
Current Consumption
6.2
Typical Performance Characteristics Current Consumption
Current Consumption Iq versus
Junction Temperature Tj
Current Consumption Iq versus
Output Current IQ
10
5
WD activated
IQ = 150 mA
4
1
Tj = -40 °C
3
Iq [mA]
Iq [mA]
IQ = 50 mA
0.1
- - - Tj = 125°C
2
Tj = 25°C
IQ = 2 mA
1
0
0.01
-40
0
40
80
0
120
50
100
150
200
IQ [mA]
Tj [°C]
Current Consumption Iq versus
Junction Temperature Tj
Current Consumption Iq versus
Input Voltage VI
100
100
Tj=25°C
I Q = 100 uA
WD deactived
80
10
60
Iq [mA]
Iq [µA]
IQ = 100 mA
40
1
IQ = 10 mA
0.1
20
0.01
0
-40
0
40
80
0
120
20
30
40
VI [V]
Tj [°C]
Data Sheet
10
15
Rev. 1.0, 2014-05-07
TLE4678-2EL
Reset Function
7
Reset Function
7.1
Description Reset Function
The reset function provides several features:
Output Undervoltage Reset:
An output undervoltage condition is indicated by setting the Reset Output “RO” to “low”. This signal might be used
to reset a microcontroller during low supply voltage.
Power-On Reset Delay Time
The power-on reset delay time td,PWR-ON allows a microcontroller and oscillator to start up. This delay time is the
time period from exceeding the upper reset switching threshold VRT,hi until the reset is released by switching the
reset output “RO” from “low” to “high”. The power-on reset delay time td,PWR-ON is defined by an external delay
capacitor CD connected to pin “D” which is charged up by the delay capacitor charge current ID,ch starting from
VD = 0 V.
In case a power-on reset delay time td,PWR-ON different from the value for CD = 100nF is required, the delay
capacitor’s value can be derived from the specified value given in Table “Power-on Reset Delay Time” on
Page 20:
CD = 100nF × td,PWR-ON / td,PWR-ON,100nF
(1)
with
td,PWR-ON: Desired power-on reset delay time
• td,PWR-ON,100nF: Power-on reset delay time specified in Table “Power-on Reset Delay Time” on Page 20
• CD: Delay capacitor required.
The formula is valid for CD ≥ 10nF. For precise timing calculations consider also the delay capacitor’s tolerance.
•
Undervoltage Reset Delay Time
Unlike the power-on reset delay time, the undervoltage reset delay time td considers a short output undervoltage
event where the delay capacitor CD is assumed to be discharged to VD = VDST,lo only before the charging sequence
starts. Therefore, the undervoltage reset delay time td is defined by the delay capacitor charge current ID,ch starting
from VD = VDST,lo and the external delay capacitor CD.
A delay capacitor CD for a different undervoltage reset delay time as specified in Table “Undervoltage Reset
Delay Time” on Page 19 can be calculated similar as above:
CD = 100nF × td / td,100nF
(2)
with:
td: Desired undervoltage reset delay time
• td,100nF: Power-on reset delay time specified in Table “Undervoltage Reset Delay Time” on Page 19
• CD: Delay capacitor required
The formula is valid for CD ≥ 10nF. For precise timing calculations consider also the delay capacitor’s tolerance.
•
Data Sheet
16
Rev. 1.0, 2014-05-07
TLE4678-2EL
Reset Function
Reset Reaction Time
In case the output voltage of the regulator drops below the output undervoltage lower reset threshold VRT,lo, the
delay capacitor CD is discharged rapidly. Once the delay capacitor’s voltage has reached the lower delay switching
threshold VDST,lo, the reset output “RO” will be set to “low”. In case of a very short drop of output voltage, may the
delay capacitor voltage doesn‘t reach the lower delay switching threshold and therefore no “RO” = “low will be set.
This prevents a microcontroller reset because of a very short distortion on output voltage. Typically the time of this
fiter effect is about 550 ns (trr,blank). See also timing diagram on Page 18
Additionally to the delay capacitor discharge time trr,d, an internal reaction time trr,int applies. Hence, the total reset
reaction rime trr,total becomes:
trr,total = trr,int + trr,d
(3)
with
•
•
•
trr,total: Total reset reaction time
trr,int: Internal reset reaction time; see Table “Internal Reset Reaction Time” on Page 20.
trr,d: Delay capacitor discharge time. For a capacitor CD different from the value specified in Table “Delay
Capacitor Discharge Time” on Page 20, see typical performance graphs.
Reset Ouput “RO”
The reset output “RO” is an open collector output with an integrated pull-up resistor. In case a lower-ohmic “RO”
signal is desired, an external pull-up resistor to the output “Q” can be connected. Since the maximum “RO” sink
current is limited, the optional external resistor RRO,ext must not below as specified in Table “Reset Output” on
Page 19.
Reset Output “RO” Low for VQ ≥ 1 V
In case of an undervoltage reset condition reset output “RO” is held “low” for VQ ≥ 1 V, even if the input voltage VI
is 0 V. This is achieved by supplying the reset circuit from the output capacitor.
Reset Adjust Function
The undervoltage reset switching threshold can be adjusted according to the application’s needs by connecting
an external voltage divider (RADJ1, RADJ2) at pin “RADJ”. For selecting the default threshold connect pin “RADJ” to
GND. The reset adjustment range is given in Table “Reset Adjustment Range” on Page 19.
When dimensioning the voltage divider, take into consideration that there will be an additional current constantly
flowing through the resistors.
With a voltage divider connected, the reset switching threshold VRT,new is calculated as follows (neglecting the
Reset Adjust Pin Current IRADJ):
VRT,new = VRADJ,th × (RADJ,1 + RADJ,2) / RADJ,2
(4)
with
•
•
•
VRT,new: Desired reset switching threshold.
RADJ,1, RADJ,2: Resistors of the external voltage divider, see Figure 6.
VRADJ,th: Reset adjust switching threshold given in Table “Reset Adjust” on Page 19.
Data Sheet
17
Rev. 1.0, 2014-05-07
TLE4678-2EL
Reset Function
I
Q
R RO
Int.
Supply
Control
VDD
CQ
RO
ID ,ch
Reset
IRO
VDST
VRADJ ,th
optional
Supply
OR
MicroController
RADJ ,1
RADJ
IRADJ
GND
opti onal
IDR ,dsch
D
BlockDiagram _ResetAdjust .vsd
GND
RADJ ,2
CD
Figure 6
Block Diagram Reset Circuit
VI
t
VQ
t < trr,blank
V RH
V RT,hi
V RT,lo
1V
t
td
VD
VDS T,hi
VDS T,lo
t
VRO
V RO,low
td
trr,total
td
t rr,total
td
t rr,total
1V
t
Thermal
Shutdown
Figure 7
Data Sheet
Input
Voltage Dip
Undervoltage
Spike at
output
Overload
T i mi n g Di a g ra m_ Re se t. vs
Timing Diagram Reset
18
Rev. 1.0, 2014-05-07
TLE4678-2EL
Reset Function
7.2
Electrical Characteristics Reset Function
Table 6
Electrical Characteristics: Reset Function
VI = 13.5 V, Tj = -40°C to +150 °C,
all voltages with respect to ground, direction of currents as shown in Figure 6 (unless otherwise specified).
Parameter
Symbol
Values
Min.
Typ.
Unit
Note / Test Condition
Number
Max.
Output Undervoltage Reset Comparator Default Values (Pin RADJ = GND)
Output Undervoltage Reset
Lower Switching Threshold
VRT,lo
4.6
4.7
4.8
V
VI = 0 VVQ decreasing
RADJ = GND
P_7.2.1
Output Undervoltage Reset
Upper Switching Threshold
VRT,hi
4.7
4.8
4.9
V
VI within operating
rangeVQ increasing
P_7.2.2
RADJ = GND
Output Undervoltage Reset
Switching Hysteresis
VRT,hy
Output Undervoltage Reset
Headroom
VRH
60
120
–
mV
VI within operating range P_7.2.3
RADJ = GND.
250
300
–
mV
P_7.2.4
Calculated Value:VQ VRT,lo VI within operating
rangeIQ = 50 mA
RADJ = GND
Reset Threshold Adjustment
Reset Adjust
Lower Switching Threshold
VRADJ,th
1.176
1.20
1.224
V
VI = 0 V
3.2 V ≤VQ < 4.6 V
P_7.2.5
Reset Adjustment Range 1)
VRT,range
3.20
–
4.60
V
–
P_7.2.6
Reset Output Low Voltage
VRO,low
–
0.2
0.4
V
P_7.2.8
Reset Output
External Pull-up Resistor to Q
RRO,ext
3
–
–
kΩ
VI = 0 V;
1 V ≤ VQ ≤ VRT,low
RRO,ext = 3.3 kΩ
VI = 0 V;
1 V ≤ VQ ≤ VRT,low
VRO = 0.4 V
Reset Output
Internal Pull-up Resistor
RRO
20
30
45
kΩ
internally connected
to Q
P_7.2.10
Upper Delay
Switching Threshold
VDST,hi
–
1.21
–
V
–
P_7.2.11
Lower Delay
Switching Threshold
VDST,lo
–
0.30
–
V
–
P_7.2.12
Delay Capacitor
Charge Current
ID,ch
–
2.8
–
µA
VD = 1 V
P_7.2.13
Delay Capacitor
Reset Discharge Current
IDR,dsch
–
80
–
mA
VD = 1 V
P_7.2.14
Undervoltage Reset Delay
Time
td,100nF
20
31
45
ms
Calculated value;
P_7.2.15
CD = 100 nF 2);
CD discharged to VDST,lo
Reset Output RO
P_7.2.9
Reset Delay Timing
Data Sheet
19
Rev. 1.0, 2014-05-07
TLE4678-2EL
Reset Function
Table 6
Electrical Characteristics: Reset Function (cont’d)
VI = 13.5 V, Tj = -40°C to +150 °C,
all voltages with respect to ground, direction of currents as shown in Figure 6 (unless otherwise specified).
Parameter
Power-on Reset Delay Time
Symbol
td,PWR-
Values
Unit
Note / Test Condition
Number
P_7.2.16
Min.
Typ.
Max.
28
43
64
ms
Calculated value;
CD = 100 nF 2);
CD discharged to 0 V;
CD = 0 nF
CD = 100 nF 2)
P_7.2.18
Calculated Value:
P_7.2.19
ON,100nF
Internal Reset Reaction Time
Delay Capacitor
Discharge Time
Total Reset Reaction Time
trr,int
trr,d,100nF
–
9
15
µs
–
1.5
3
µs
10.5
18
µs
trr,total,100nF –
P_7.2.17
trr,d,100nF + trr,int ;
CD = 100 nF 2)
1) Related Parameters (VRT,hi, VRT,hy) are scaled linear when the Reset Switching Threshold is modified.
2) For programming a different delay and reset reaction time, see Chapter 7.1.
Data Sheet
20
Rev. 1.0, 2014-05-07
TLE4678-2EL
Reset Function
7.3
Typical Performance Characteristics Reset Function
Undervoltage Reset Switching Thresholds
VRT,LOW , VRT,HIGH versus Junction Temperature Tj
Reset Delay Time td , td,PWR-ON versus
Delay Capacitor CD
5.2
1000
IQ = 1 mA
Pin RADJ = GND
Tj = 25° C
5.1
VQ
5
100
t d,PWR-ON (typ.)
td,
td,PWR-ON
[ms]
4.9
VQ [V],
VRT [V]
VRT,hi
4.8
td (typ.)
10
VRT,lo
4.7
1
4.6
-40 -20
0
20
40
60
80
10
100 120 140
Tj [°C]
Data Sheet
100
1000
CD [nF]
21
Rev. 1.0, 2014-05-07
TLE4678-2EL
Watchdog Function
8
Watchdog Function
8.1
Description
The TLE4678-2EL features a load dependent watchdog function with a programmable activating threshold as well
as a programmable watchdog timing.
The watchdog function monitors a 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’. The programming of the expected
watchdog pulse repetition time can be easily done by an external reset delay capacitor.
The watchdog output “WO” is separated from the reset output “RO”. Hence, the watchdog output might be used
as an interrupt signal for the microcontroller independent from the reset signal. It is possible to interconnect pin
“WO” and pin “RO” in order to establish a wire-or function with a dominant low signal.
Programmable Watchdog Activation Threshold and Hysteresis
In case a microcontroller is set to sleep mode or to low power mode, its current consumption is very low and the
controller might not be able to send any watchdog pulses to the regulators watchdog input “WI”. In order to avoid
unwanted wake-up signals due to missing edges at pin “WI”, the TLE4678-2EL watchdog function can be activated
dependent on the regulator’s output current. The TLE4678-2EL comprises a default watchdog activating threshold
IQ,WDact,th with a small hysteresis IQ,WDact,hy which is modifiable by an external resistor RWADJ,ext connected to the
pin “WADJ”. For using the default watchdog activating threshold, leave pin “WADJ” open.
The following tabel shows the external resisistor RWADJ,ext that is needed at pin “WADJ” for activating/deactivating
the watchdog at a desired output current IQ,WDact,th, IQ,WDdeact,th.
Table 7
RWADJ,ext [kOhm)]
IQ,WDact,th [mA]
IQ,WDdeact,th [mA]
IQ,WDact,hy [µA]
4000
1.015
0.987
28
470
1.339
1.310
29
220
1.761
1.700
61
100
2.728
2.612
116
50
4.435
4.217
219
33
6.333
6.016
318
20
9.792
9.310
482
10
18.523
17.838
685
7.5
24.198
23.472
725
Data Sheet
22
Rev. 1.0, 2014-05-07
TLE4678-2EL
Watchdog Function
Supply
I
IQ
Q
IWADJ
Control
VDD
CQ
RWO
VWADJ,th
RWADJ ,ext
optional
WADJ
MicroController
RWADJ ,int
(optional)
Int.
Supply
WI
Edge
Detect
OR
S
WO
I D,ch
Reset
IWO
VDW
&
1
R
IDW ,dsch
WI
I/O
VDW,hi
GND
D
BlockDiagram _WatchdogAdjust .vsd
GND
CD
Figure 8
Block Diagram Watchdog Circuit
Watchdog Output “WO”
The watchdog output “WO” is an open collector output with an integrated pull-up resistor. In case a lower-ohmic
“WO” signal is desired, an external pull-up resistor to the output “Q” can be connected. Since the maximum “WO”
sink current is limited, the optional external resistor RWO,ext needs to be sized to comply with the watchdog output
sink current (see Table “Watchdog Output Low Voltage” on Page 25 and Table “Watchdog Output
Maximum Sink Current” on Page 25).
Watchdog Input “WI”
The watchdog is triggered by an positive edge at the watchdog input “WI”. The signal is filtered by a bandpass
filter and therefore its amplitude and slope has to comply with the specification Table “Watchdog Input” on
Page 25 to Table “Watchdog Input Signal Slew Rate” on Page 25. For details on the test pulse applied, see
Figure 9.
Data Sheet
23
Rev. 1.0, 2014-05-07
TLE4678-2EL
Watchdog Function
V WI
V WI
tWI,p
VWI,hi
VWI,lo
1 / fWI
VWI,hi
VWI,lo
d VWI / d t
t
Figure 9
t
Test Pulses Watchdog Input WI
Watchdog Timing
Positive edges at the watchdog input pin “WI” are expected within the watchdog trigger time frame tWI,tr, otherwise
a low signal at pin “WO” is generated. If a watchdog low signal at pin “WO” is generated, it remains low for tWD,lo.
All watchdog timings are defined by charging and discharging the capacitor CD at pin “D”. Thus, the watchdog
timing can be programmed by selecting CD. For timing details see also Figure 10.
In case a watchdog trigger time period tWI,tr different from the value for CD = 100nF is required, the delay
capacitor’s value can be derived from the specified value given in Table “Watchdog Trigger Time” on Page 26:
CD = 100nF × tWI,tr / tWI,tr,100nF
(5)
The watchdog output low time tWD,lo and the watchdog period tWD,p then becomes:
tWD,lo = tWD,lo,100nF × CD / 100nF
(6)
tWD,p = tWI,tr + tWD,lo
(7)
The formula is valid for CD ≥ 10nF. For precise timing calculations consider also the delay capacitor’s tolerance.
VWI
V WI,hi
V WI,lo
dV WI / d t
outside spec
No positive
VWI edge
VD
tWI,tr
1/ fWI
t WI,p
t
TWI,p
VDW,hi
VDW,lo
t
t WD,lo
t WD,lo
VWO
V WO,low
Figure 10
Data Sheet
T i mi n g Di a g ra m_ W a t ch d o g .vsd
t
Timing Diagram Watchdog
24
Rev. 1.0, 2014-05-07
TLE4678-2EL
Watchdog Function
8.2
Electrical Characteristics Watchdog Function
Table 8
Electrical Characteristics: Watchdog Function
VI = 13.5 V, Tj = -40°C to +150 °C,
all voltages with respect to ground, direction of currents as shown in Table 8 (unless otherwise specified).
Parameter
Symbol
Values
Min.
Typ.
Unit
Note / Test Condition Number
Max.
Default Watchdog Activating Threshold (pin WADJ left open)
Watchdog Activating Threshold IQ,WDact,th
Watchdog Deactivating
Threshold
0.65
1.1
1.65
mA
IQ,WDdeact,t 0.55
0.9
–
mA
IQ increasing
IQ decreasing
P_8.2.2
26
–
µA
–
P_8.2.3
P_8.2.1
h
Watchdog Activating Threshold IQ,WDact,hy –
Hysteresis
Adjustable Watchdog Activating Threshold (external resistor connected to pin WADJ)
Watchdog Activating Threshold IQ,WDact,th
Watchdog Deactivating
Threshold
P_8.2.4
µA
IQ increasing
RWADJ,ext = 220 kΩ1) 2)
IQ decreasing
RWADJ,ext = 220 kΩ1) 2)
RWADJ,ext = 220 kΩ1) 2)
–
1.76
–
mA
IQ,WDdeact,t –
1.70
–
mA
60
–
h
Watchdog Activating Threshold IQ,WDact,hy –
Hysteresis
P_8.2.5
P_8.2.6
Watchdog Input WI
Watchdog Input
Low Signal Valid
VWI,lo
–
–
0.8
V
– 3)
P_8.2.7
Watchdog Input
High Signal Valid
VWI,hi
2.6
–
–
V
– 3)
P_8.2.8
Watchdog Input
High Signal Pulse Length
tWI,p
0.5
–
–
µs
VWI ≥ VWI,high 3)
P_8.2.9
Watchdog Input Signal
Slew Rate
dVWI/dt
1
–
–
V/µs
VWI,low ≤ VWI ≤ VWI,high 3) P_8.2.10
Watchdog Input Signal
Frequency Capture Range
fWI
–
–
1
MHz
Square Wave,
50% Duty Cycle 3)
P_8.2.11
Watchdog Output
Low Voltage
VWO,low
–
0.2
0.4
V
IWO = 1 mA;
P_8.2.12
Watchdog Output
Maximum Sink Current
IWO,max
1.5
13
30
mA
VWO = 0.8 V;
Watchdog active;
VWI = 0 V
P_8.2.13
Watchdog Output
Internal Pull-up Resistor
RWO
20
30
45
kΩ
–
P_8.2.14
Delay Capacitor
Charge Current
ID
–
2.78
–
µA
VD = 1 V
P_8.2.15
Delay capacitor
watchdog discharge current
IDW,disch
–
1.39
–
µA
VD = 1 V
P_8.2.16
Watchdog Output WO
Watchdog active;
VWI = 0 V
Watchdog Timing
Data Sheet
25
Rev. 1.0, 2014-05-07
TLE4678-2EL
Watchdog Function
Table 8
Electrical Characteristics: Watchdog Function (cont’d)
VI = 13.5 V, Tj = -40°C to +150 °C,
all voltages with respect to ground, direction of currents as shown in Table 8 (unless otherwise specified).
Parameter
Symbol
Values
Min.
Typ.
Max.
Unit
Note / Test Condition Number
Upper watchdog timing
threshold
VDW,hi
–
1.2
–
V
–
P_8.2.17
Lower watchdog timing
threshold
VDW,lo
–
0.7
–
V
–
P_8.2.18
Watchdog Trigger Time
tWI,tr,100nF
24
36
54
ms
Calculated value;
CD = 100 nF 4)
P_8.2.19
Watchdog Output Low Time
tWD,lo,100nF 12
18
27
ms
Calculated value;
P_8.2.20
tWD,p,100nF 36
54
Watchdog Period
1)
2)
3)
4)
CD = 100 nF 4)
VQ > VRT,lo
81
ms
Calculated value;
P_8.2.21
tWI,tr,100nF + tWD,lo,100nF
CD = 100 nF 4)
For details see Table 7.
Not subject to production test, specified by design.
For details on the test pulse applied, see Figure 9.
For programming a different watchdog timing, see Chapter 8.1..
Data Sheet
26
Rev. 1.0, 2014-05-07
TLE4678-2EL
Watchdog Function
8.3
Typical Performance Characteristics Standard Watchdog Function
Watchdog Activating Threshold IQ,WDact,th versus
External Resistor RWADJ,ext
24
Watchdog Deactivating Threshold IQ,WDdeact,th versus
External Resistor RWADJ,ext
24
Tj = 25° C
Tj = 25° C
22
22
20
20
18
18
16
16
14
14
12
12
IQ,WDact,th
[mA] 10
IQ,WDdeact,th
[mA] 10
8
8
6
6
4
4
2
2
0
0
1
10
100
1000
10000
1
RWADJ ,ext [kΩ]
100
1000
10000
RWADJ ,ext [kΩ]
Watchdog Trigger Time tWI,tr versus
Delay Capacitor CD
1000
10
Watchdod Activation Threshold Hysteresis
IQ,WDact,hy versus External Resistor RWADJ,ext
800
Tj = 25° C
Tj = 25° C
700
600
100
500
400
tWI,tr
[ms]
IQ,WDact,hy
[µA]
300
10
200
100
0
1
10
100
1
1000
100
1000
10000
RWADJ ,ext [kΩ]
CD [nF]
Data Sheet
10
27
Rev. 1.0, 2014-05-07
TLE4678-2EL
Application Information
9
Application Information
The following information is given as a hint for the implementation of the device only and shall not be regarded as
a description or warranty of a certain functionality, condition or quality of the device.
Application Diagram
Supply
TLE4678-2
I
Q
RO
DI
C I2
C I1
工商网监
湘ICP备2023018690号
