Datasheet

Datasheet 9 Rev. 1.0, 2008-08-28
Smart High-Side Power Switch
BTS50080-1TEA
Power Stages
5 Power Stages
The power stage is built by a N-channel vertical power MOSFET (DMOS) with charge pump.
5.1 Input Circuit
Figure 4 shows the input circuit of the BTS50080-1TEA. The current source to V
bb
ensures that the device
switches off in case of open input pin. The zener diode protects the input circuit against ESD pulses.
Figure 4 Input Circuit
A high signal at the required external small signal transistor pulls the input pin to ground. A logic supply current I
IN
is flowing and the power DMOS switches on with a dedicated slope, which is optimized in terms of EMC emission.
Figure 5 Switching a Load (resistive)
5.2 Output On-State Resistance
The on-state resistance R
DS(ON)
depends on the supply voltage as well as the junction temperature T
j
. Figure 6
shows these dependencies for the typical on-state resistance. The voltage drop in reverse polarity mode is
described in Section 6.3.
IN
R
bb
I
V
bb
Input.emf
V
Z,IN
V
IN
I
IN
V
bIN
V
OUT
t
SwitchOn.emf
t
I
IN
10%
25%
50%
90%
t
ON
t
OFF
(dV/dt)
ON
(d V/dt)
OFF