L9945 datasheet(4/151 Pages) STMICROELECTRONICS

4 / 151 page

Applications

The device offers three different configuration options for the output channels: High-Side/Low-Side, Peak & Hold

and H-Bridge. P&H configuration requires 2 or 4 channels, while H-Bridge requires 4 or 8 channels. Channels not

used in P&H or H-Bridge are available for HS/LS usage. All the configurations involving channel 6 require the

output driver 6 to be enabled through the EN6 input.

2.1

High-Side / Low-Side, with configurable FET type (N channel or P channel)

Each channel features a dedicated SPI register where the user can specify:

•

MOS side: High-Side or Low-Side, through the LS_HS_config_xx bit;

•

MOS type: NMOS or PMOS, through the N_P_config_xx bit;

–

PMOS type is available only for High-Side.

The picture below shows an example of High-Side configuration with NMOS transistor on channel 1. Refer to this

schematic in order to understand how the external FET must be mounted with respect to the DRNx/GNSPx/

SNGPx/BATTx pins.

Figure 2. Example of High-Side configuration with NMOS on channel 1

GADG2302171549PS

Note: the freewheeling diode is needed only in case of inductive load.

BATT12

HS NMOS

DRN1

GND

VBATT

OUT1

GND

GNSP1

SNGP1

RPD

DFW

ESD

CBATT

RSH

PGND12

The following picture shows an example of High-Side configuration with PMOS transistor on channel 5. Refer to

this schematic in order to understand how the external FET must be mounted with respect to the DRNx/GNSPx/

SNGPx/BATTx pins.

L9945

Applications

DS12275 - Rev 8

page 4/151

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