Datasheet

Description L99MC6
12/32 Doc ID 16523 Rev 2
2 Description
2.1 Dual power supply: V
S
and V
CC
The supply voltage V
CC
(3.3 V/5 V) supplies the whole device. In case of power-on (V
CC
increases from undervoltage to V
POR OFF
= 2.7 V, typical) the circuit is initialized by an
internally generated power-on reset (POR). If the voltage V
CC
decreases under the
minimum threshold (V
POR ON
= 2.4 V, typical), the outputs are switched-off (high-
impedance) and the status registers are cleared (see Figure 4).
Figure 4. Power-on reset
2.1.1 Channels
The channels 1 to 3 are self configuring high-side or low-side n-channel mosfets. This
flexibility allows the user to connect loads in high-side or low-side configuration in any
combination.
In order to provide low R
dson
values for high-side configured switches (channels 1 to 3), a
charge pump (CP) to drive the internal gate voltage(s) is implemented. If the charge pump is
activated (ENCP1 = 1, DISCP2 = 0, see Section 9.3: Control and status registers), the
internal charge-pump uses V
S
from the drain of channel 1, as its power source. Otherwise
V
CC
is used to drive all channels.
The channels 4 to 6 are n-channel low-side drivers. The source of the respective mosfet are
internally connected to the device GND.
Caution: For any high-side configuration, channel 1 must be used as a high-side switch.
If channel 1 is configured as low-side, the charge pump has to be deactivated to avoid
charge pump current from the drain.
Caution: The charge pump may not be deactivated (see Section 9.3: Control and status registers) if
one of the channels is in high-side configuration, while a short-circuit from the source to the
battery is present. If these conditions occur, the voltage of the shorted source is applied to
the VCC pin.
V
POR hyst.
I
C
is disabled
All Status Registers are cleared
V
POR OFF
V
POR ON
V
CC