TLE4678 Datasheet, PDF (26/31 Pages) Infineon Technologies AG – Low Drop Out Linear Voltage Regulator 5 V Fixed Output Voltage

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).
Pos. Parameter
Symbol
Limit Values
Unit Conditions
Min. Typ. Max.
Watchdog Output WO
8.2.15 Watchdog Output
Low Voltage
8.2.16 Watchdog Output
Maximum Sink Current
8.2.17 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 –
Watchdog Timing
8.2.18 Delay Capacitor
Charge Current
I_D
–
2.78 –
µA
V_D = 1 V
8.2.19 Delay capacitor
watchdog discharge current
I_DW,disch –
1.39 –
µA
V_D = 1 V
8.2.20 Upper watchdog timing
threshold
V_DW,hi
–
1.2
–
V
–
8.2.21 Lower watchdog timing
threshold
V_DW,lo
–
0.7
–
V
–
8.2.22 Watchdog Trigger Time
t_WI,tr,100nF 25
36
47
ms Calculated value;
C_D = 100 nF ³⁾
8.2.23 Watchdog Output Low Time t_WD,lo,100nF 13
18
23
ms Calculated value;
C_D = 100 nF ³⁾
V_Q > V_RT,lo
8.2.24 Watchdog Period
t_WD,p,100nF 38
54
70
ms Calculated value;
t t _WI,tr,100nF + _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
26
Rev. 1.1, 2009-08-27