TLE4678_15 Datasheet, PDF (28/37 Pages) Infineon Technologies AG – Low Drop Out Linear Voltage Regulator

TLE4678
Watchdog Function
Electrical Characteristics Watchdog Function
V_I = 13.5 V, T_j = -40 °C to +150 °C,
all voltages with respect to ground, direction of currents as shown in Figure 9 (unless otherwise specified).
Parameter
Symbol
Limit Values
Unit Conditions
Number
Min. Typ. Max.
Watchdog Output WO
Watchdog Output
Low Voltage
Watchdog Output
Maximum Sink Current
Watchdog Output
Internal Pull-up Resistor
V_WO,low –
0.2 0.4 V
I_WO = 1 mA;
Watchdog active;
V_WI = 0 V
I_WO,max 1.5
13
30
mA V_WO = 0.8 V;
Watchdog active;
V_WI = 0 V
R_WO
20 30 40 kΩ –
8.2.15
8.2.16
8.2.17
Watchdog Timing
Delay Capacitor
Charge Current
I_D
–
2.78 –
µA V_D = 1 V
8.2.18
Delay capacitor
I_DW,disch –
watchdog discharge current
1.39 –
µA V_D = 1 V
8.2.19
Upper watchdog timing
threshold
V_DW,hi
–
1.2 –
V
–
8.2.20
Lower watchdog timing
threshold
V_DW,lo
–
0.7 –
V
–
8.2.21
Watchdog Trigger Time
t_WI,tr,100nF 25
36
47
ms Calculated value;
C_D = 100 nF ³⁾
8.2.22
Watchdog Output Low Time t_WD,lo,100nF 13
18
23
ms Calculated value;
C_D = 100 nF ³⁾
V_Q > V_RT,lo
8.2.23
Watchdog Period
t_WD,p,100nF 38
54
70
ms Calculated value;
8.2.24
t_WI,tr,100nF + t_WD,lo,100nF
C_D = 100 nF ³⁾
1) See Chapter 8.1 for calculation hint
2) For details on the test pulse applied, see Figure 11.
3) For programming a different watchdog timing, see Chapter 8.1.
Datasheet
28
Rev. 1.2, 2014-10-17