Datasheet

Smart Low-Side Power Switch
BTS3405G
Block Description and CharacteristicsInput and Power Stage
Data Sheet 10 Rev. 1.1, 2011-09-01
5 Block Description and Characteristics
5.1 Input and Power Stage
5.1.1 Input Circuit
Figure 6 shows the input circuit of the BTS3405G. The zener Diode protects the input circuit against ESD pulses.
The internal circuitry is supplied by the input PIN. During normal operation the Input is connected to the Gate of
the power MOSFET. During fault condition the device tries to sink the current
I
INlim
in order to give the fault
information back to the driving circuit.
Figure 6 Input Circuit
Figure 7 Typical Input Threshold Voltage
V
inth
= f(T
J
); I
D
= 50 μA, V
D
= V
IN
Figure 8 Typical Transfer Characteristic I
D
= f(V
IN
); V
D
= 12 V, T
Jstart
= 25 °C
Input.emf
Source
Z
D
INI
IN
Gate
Fault
condition
I
INlim
I
INno m
Logic
0,00
0,25
0,50
0,75
1,00
1,25
1,50
1,75
2,00
-50 -25 0 25 50 75 100 125 150
V
IN(th)
[ V ]
T [°C]
Vinth.emf
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
012345
I
D
[ A ]
V
IN
[ V ]
Transferchar.emf