L9788 datasheet(100/264 Pages) STMICROELECTRONICS

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Low-side drivers

L9788

100/264

DS12308 Rev 4

7.5

Low-side driver - RELAY RLY [1:5]

These 5 LowSide drivers are optimized for relay or generic low current loads driving. They

are driven by MSC command. The Output voltage is clamped to voltage limit by internal

clamp circuit.

Each relay driver is separately put in on or off state by the MSC CONFIG-REG 14 [0:4] just

for the time required to perform on or off diagnosis (Fast Diagnosis). At the end of the

diagnosis it is automatically put in the state determined by the current value of MSC data

frame.

The micro command is activated by writing 1 from 0 in the MSC registers (both for ON and

OFF).

Figure 38. Relay LowSide driver stage

Conditions:

5.5 V ≤ VB_IN ≤ 18 V, Tj -40 to 175 °C unless otherwise specified; the RLY4 can be

associated to DELAY_OFF function if the MSC CONFIG_REG_3 [0] = RLY4_DLY_OFF_EN

is set. In this case the RLY4 is configured as starter and can work down to VB_IN = 3.1 V for

THOLD.

GADG0212161126PS

PGND

OUTx

RELAY DRIVER

Relay

MSC Command

OFF state

OL & STG detection

Driver

ON state

OC & OT protection

VBAT

Chip en

Table 48. Low-side driver - RELAY electrical characteristics

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

Relay

LS_RdsON

Low-side RdsON

Tj = 150 °C, ILOAD = 1 A

1.5

Ω

RLY/1/2/3/4/5

LS_RdsON

Low-side RdsON

Tj = 25 °C, ILOAD = 1 A

0.82

Ω

RLY/1/2/3/4/5

LS_RdsON

Low-side RdsON

Tj = 40 °C, ILOAD = 1 A

0.63

Ω

RLY/1/2/3/4/5

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