Specifications
CC
GND
GND
±9
R
±,
t
GNDshift
GND
nom
V
R
I
d
Gate drive
and Clamp
Logic and
Protection
Current Sense/
Current Limit
IN
CURRENT LIMIT
CS
Version B
SOURCE
DRAIN
Output
Clamp
DIAG_EN
GND
Dgnd
Rgnd
NC
(Floating)
Load
STATUS
Version A
VBAT
GND
Network
TPS1H100-Q1
www.ti.com
SLVSCM2A –OCTOBER 2014–REVISED JANUARY 2014
Method 2 (GND network protection): Only the high-side device is protected under this connection. The load
reverse loop is limited by the load itself. Note when reverse polarity happens, the continuous reverse current
through the power FET should be less than I
rev
. Of the three types of ground pin networks, TI strongly
recommends type 3 (the resistor and diode in parallel). No matter what types of connection are between IC GND
and the board GND, if a GND voltage shift happens, ensure the following proper connections for the normal
operation:
• Leave the NC pin floating or connect to the IC GND. TI recommends to leave floating.
• Connect the current limit programmable resistor to IC GND.
Figure 42. Reverse Protection With GND Network
• Type 1 (resistor): The higher resistor value contributes to a better current limit effect when the reverse
battery or negative ISO pulses. However, it leads to higher GND shift during normal operation mode. Also,
consider the resistor’s power dissipation.
(9)
where
• V
GNDshift
is the maximum value for the GND shift, determined by the HSD and microcontroller. TI suggests a
value ≤ 0.6 V.
• I
nom
is the nominal operating current.
• –V
CC
is the maximum reverse voltage seen on the battery line.
• –I
GND
is the maximum reverse current the ground pin can withstand, which is available in the Absolute
Maximum Ratings. (10)
If multiple high-side power switches are used, the resistor can be shared among devices.
• Type 2 (diode): A diode is needed to block the reverse voltage, which also brings a ground shift (≈ 600 mV).
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