TLE4678 Datasheet, PDF (25/31 Pages) Infineon Technologies AG – Low Drop Out Linear Voltage Regulator 5 V Fixed Output Voltage

TLE4678
8.2
Electrical Characteristics Watchdog Function
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.
Default Watchdog Activating Threshold (pin WADJ left open)
8.2.1
Watchdog Activating
Threshold
I_Q,WDact,th 0.65
1.1
1.5
mA I_Q increasing
8.2.2
Watchdog Deactivating
Threshold
I_Q,WDdeact,th 0.55
0.9
–
mA I_Q decreasing
8.2.3
Watchdog Activating
Threshold Hysteresis
I_Q,WDact,hy 50
200 –
µA –
Adjustable Watchdog Activating Threshold (external resistor connected to pin WADJ)
8.2.4 Activating Threshold
V_WADJ,th –
693 –
mV –
8.2.5 Current ratio
I_Q / I_WADJ –
208 –
–
V_WADJ = 0V
8.2.6
Internal Watchdog Adjust
Resistor
R_WADJ,int 96
131 175 kΩ –
8.2.7 Activating Threshold Factor F_WDact,th 127
144
162
mA
Calculated value ¹⁾
× kΩ
8.2.8 Deactivating Threshold Factor F_WDdeact,th 104
118
–
mA Calculated value ¹⁾
× kΩ
8.2.9
Activating Threshold
Switching Hysteresis Factor
F_WDact,hy 7
26
–
mA Calculated value ¹⁾
× kΩ
Watchdog Input WI
8.2.10 Watchdog Input
Low Signal Valid
8.2.11 Watchdog Input
High Signal Valid
8.2.12 Watchdog Input
High Signal Pulse Length
8.2.13 Watchdog Input Signal
Slew Rate
V_WI,lo
–
–
V_WI,hi
2.6
–
t_WI,p
0.5
–
dV_WI/dt 1
–
0.8
V
– ²⁾
–
V
– ²⁾
–
µs
V_WI ≥ V_WI,high ²⁾
–
V/µs V_WI,low ≤ V_WI ≤ V_WI,high ²⁾
8.2.14 Watchdog Input Signal
f_WI
Frequency Capture Range
–
–
1
MHz Square Wave,
50% Duty Cycle ²⁾
Datasheet
25
Rev. 1.1, 2009-08-27