L9848

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as well as provide proper fault mode operation with no other needed inputs. This device switch variable load

currents within the operation temperature range. The outputs are MOSFET drivers to minimize Vdd current re-

quirements. There's no VBatt input pin however VBatt is connected to the drains of high side outputs. The L9848

meets all required specifications when the supply voltage applied to the drain(s) of the outputs is within the op-

erating range. For supply voltages applied to the drain(s) down to 6.8V the part is functional however, it does

not meet all parametric limits, i.e. output on-state voltages.

Outputs - Common Characteristics

The 6 self-configuring outputs (Outputs1-6) are able to drive either incandescent lamps, inductive loads (non-

PWMed), or resistive loads biased to VBatt. These outputs are enabled and disabled via the SPI bus. Each of

these outputs is short circuit current limited and has an over-temperature protection as described under "Func-

tional Description - Thermal Shutdown". When a high side configured output is commanded OFF after having

been commanded ON, the source voltage will go to the lesser negative of (VBatt-45V). This is due to the design

of the circuitry and the transconductance of the MOSFET. When a low side configured output is commanded

OFF after having been commanded ON, the output voltage will rise to the internal zener clamp voltage (40Vdc

minimum) due to the flyback of the inductive load.

– Output 1-4

These four outputs can be used as either high or low side drives. Integrated current source pull-ups

and pull-downs are employed to correctly latch "open load" fault data. Both of these current sources

are needed to detect an open load state since these outputs self configure as either high or low side

drives.

Drain Connections of Output1-4 (DRN1-4)

These pins are connected to the drains of the n-channel MOSFET transistors.

Source Connections of Output1-4 (SRC1-4)

These pins are connected to the sources of the n-channel MOSFET transistors.

– Output 5-6

These two self-configuring outputs can be used to drive either high or low side loads. In addition to

be controlled by the SPI BUS these outputs can also be enabled and disabled via IN5 and IN6 inputs.

IN5 and IN6 inputs are logically ORed with the SPI commands to allow either the IN5-6 inputs or the

SPI commands to activate these outputs. The use of IN5-6 for PWM control on these outputs should

only be done with non-inductive loads. Integrated current source pull-ups and pull-downs are em-

ployed to correctly latch "open load" fault data. Both of these current sources are needed to detect

an open since these outputs self configure as either high or low side drives

Drain connections of Output5-6 (DRN5-6)

These pins are connected to the drains of the n-channel MOSFET transistors.

Source connections of Output5-6 (SRC5-6)

These pins are connected to the sources of the n-channel MOSFET transistors.

– Output7-8

These two outputs (DRN7-8) are dedicated low side drives. Integrated current source pull down are

required to correctly latch "open load" fault data.

Main Power Input (VDD)

The VDD input is the primary power source of the L9848. This supply is used as the power source for all of its