L9788 datasheet(88/264 Pages) STMICROELECTRONICS

88 / 264 page

Low-side drivers

L9788

88/264

DS12308 Rev 4

7.2

Low-side driver - INJECTOR INJ[1:4]

These 4 low-side drivers are designed to driver Injector Load. They are driven by MSC

command. The output voltage is clamped to voltage limit by internal clamp circuit.

Figure 34. INJECTOR LowSide driver stage

Conditions:

5.5 V ≤ VB_IN ≤ 18 V; Tj -40 to 175 °C unless otherwise specified;

Driver Status Error (STA)

Driver on/off

When the driver

output level is not

aligned with the

command on/off

The fault is latched in

MSC diagnosis

On read

Overtemperature (OVT)

Shutdown

Driver on

Driver is put in off

state. The fault is

latched in MSC

diagnosis register.

On read

The driver restarts when the

temperature decreases. The

fault is cleared at MSC read.

Table 43. Low-side driver error handling (continued)

Type of error

Detection

condition

Action

Clear MSC

flag

Restart condition

GADG0212160751PS

PGND

OUT1/2/3/4

INJECTOR DRIVER

INJ LOAD

MSC Command

OFF state

OL & STG detection

Driver

ON state

OC & OT protection

Safety BIST control

VBAT

L/R

Table 44. Low-side driver - INJECTOR electrical characteristics

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

INJECTOR

LS_RdsON

Low-side RdsON

Tj = 150 °C, ILOAD = 3 A

0.35

0.44

0,6

Ω

INJ1/2/3/4

LS_RdsON

Tj = 25°C,ILOAD = 3 A

0.22

0.3

0.31

Ω

INJ1/2/3/4

LS_RdsON

Tj = -40 °C, ILOAD = 3 A

0.15

0.2

0.25

Ω

INJ1/2/3/4

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