BTS3256D Datasheet, PDF (10/30 Pages) Infineon Technologies AG – 10 mΩ smart power single channel low side switch with restart and variable slew rate

Smart Low Side Power Switch
HITFET - BTS 3256D
Supply and Input Stage
5
Supply and Input Stage
5.1
Supply Circuit
The Supply pin V_S is protected against ESD pulses as shown in Figure 5.
Due to an internal voltage regulator the device can be supplied from a reverse polarity protected battery line.
5.5V .. 30V
BTS3256 D
V_S
Regulator
Z_D
Figure 5 Supply Circuit
GND
Supply .emf
5.1.1 Under Voltage Lock Out / Power On Reset
In order to ensure a stable device behavior under all allowed conditions the Supply voltage V_S is monitored by the
under voltage lock out circuit. All device functions are only given for supply voltages above under voltage lockout.
There is no failure feedback for V_S < V_SUVON.
Device
functional
off
V_{S U V O F F}
V_SUVON
Figure 6 Under Voltage Lock Out
UVLO.emf
5.2
Input Circuit
Figure 7 shows the input circuit of the BTS 3256D. It’s ensured that the device switches off in case of open input
pin. A Zener structure protects the input circuit against ESD pulses. As the BTS 3256D has a supply pin, the
operation of the power MOS can be maintained regardless of the voltage on the IN pin, therefore a digital status
feedback down to logic low is realized. For readout of the fault information, please refer to Diagnosis “Readout of
Fault Information” on Page 20.
Datasheet
10
Rev. 1.0, 2009-05-05