L9026 datasheet(31/60 Pages) STMICROELECTRONICS

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8.2

Overtemperature protection

A temperature sensor is integrated for each channel. Totally 8 temperature sensors are present, which switch

OFF the channel in overtemperature in order to prevent destruction.

Once a channel overtemperature is detected, the corresponding diagnosis bit DIAG_OVC_OVT is set (combined

with Over Load protection). The channel can be switched ON after clearing the protection latch by setting the

corresponding DIAG_OVC_OVT_RLW.OUTn bit to “1”. This bit is set back to “0” internally after de-latching the

channel.

8.3

Overtemperature and overload in Limp Home mode

In Limp Home mode, through the input pin In0 and In1, the channels 2 and 3 can be switched ON. In case of

overload, short-circuit or overtemperature the channels are switched OFF. If In0 and In1 remain “high”, the

channel remains on, in case of overload the channels restart at every tRETRY.

8.4

Reverse polarity protection

In case of reverse polarity (battery) condition, the body diode of each DMOS cause the power dissipation. The

reverse current through the channels has to be limited by the connected loads.

In order to sustain the Reverse polarity condition the exposed pad of device must be left electrically floating.

8.5

Electrical characteristics

3 V ≤ VDDIO ≤ 5.5 V; 6 V ≤ VBATT ≤ 18 V; -40 °C ≤ Tj ≤ 150 °C unless otherwise noticed. All voltages are

referred to GND pin.

Table 17. Over temperature and over load electrical parameters

Symbol

Description

Test condition

Min

Typ

Max

Unit

IL(OVL0_LS)

Over Load detection current

(Channels used as Low-Side)

TJ = -40 °C

1.9

IL(OVL0_LS)

Over Load detection current

(Channels used as Low-Side)

TJ = 25 °C

1.7

IL(OVL0_LS)

Over Load detection current

(Channels used as Low-Side)

TJ = 150 °C

1.7

IL(OVL1_LS)

Over Load detection current

(Channels used as Low-Side)

TJ = -40 °C

0.6

IL(OVL1_LS)

Over Load detection current

(Channels used as Low-Side)

TJ = 25 °C

0.6

IL(OVL1_LS)

Over Load detection current

(Channels used as Low-Side)

TJ = 150 °C

0.6

IL(OVL0_HS)

Over Load detection current

(Channels used as High-Side)

TJ = -40 °C

1.2

2.1

IL(OVL0_HS)

Over Load detection current

(Channels used as High-Side)

TJ = 25 °C

1.2

1.9

IL(OVL0_HS)

Over Load detection current

(Channels used as High-Side)

TJ = 150 °C

1.7

IL(OVL1_HS)

Over Load detection current

(Channels used as High-Side)

TJ = -40 °C

0.7

1.4

IL(OVL1_HS)

Over Load detection current

(Channels used as High-Side)

TJ = 25 °C

0.7

1.3

IL(OVL1_HS)

Over Load detection current

TJ = 150 °C

0.7

1.2

L9026

Protection functions

DS13397 - Rev 9

page 31/60

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