Datasheet

Data Sheet 15 Rev. 1.0, 2008-03-18
BTS4130QGA
Protection Mechanisms
In the case the supply voltage is in between of V
S(SC) max
and V
DS(AZ)
, the output transistor is still operational and
follow the input. If at least one channel is in ON state, parameters are no longer warranted and lifetime is reduced
compared to normal mode. This specially impacts the short circuit robustness, as well as the maximum energy
E
AS
the device can handle.
6.4 Reverse Polarity Protection
In case of reverse polarity, the intrinsic body diode causes power dissipation. The current in this intrinsic body
diode is limited by the load itself. Additionally, the current into the ground path and the logical pins has to be limited
to the maximum current described in
Chapter 4.1, sometimes with an external resistor. Figure 10 shows a typical
application. The R
GND
resistor is used to limit the current in the zener protection of the device. Resistors R
IN
and
R
ST
are used to limit the current in the logic of the device and in the ESD protection stage. The recommended value
for
R
GND
is 150Ω, for R
ST 0/1
= 15kΩ. In case the over voltage is not considered in the application, R
GND
can be
replaced by a Shottky diode.
Figure 10 Reverse polarity protection with external components
6.5 Overload Protection
In case of overload, or short circuit to ground, the BTS4130QGA offers several protections mechanisms.
Micro controller
protection diodes
GND
OUT0, 1, 2, 3
IN1
V
S
V
BAT
R
IN0 IN0
ST 0/1
R
IN 1
R
ST /1
R
GND
ZD
body
Rever se Polarity quad shar ed
diag .vsd
-V
DS(REV)
I
L(nom)
R
L
R
PU ST 0/1
VccµC
ZD
ESD
IN1
R
IN0
IN0
ST 2/3
R
IN 1
R
ST 2/3
R
PU ST 2/3
VccµC
ZD
ESD