L9026 datasheet(29/60 Pages) STMICROELECTRONICS

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8.2

Over temperature protection

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

OFF the channel in over temperature in order to prevent destruction.

Once a channel over temperature 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

Over temperature and over load in Limp Home mode

In Limp Home mode, channels 2 and 3 can be switched ON using the input pins. In case of Over Load, Short

Circuit or Over Temperature the channels are switched OFF. If the input pins remain “high”, meaning that the

channel is still required to be on, in case of Over Load the channels restart at every tRETRY.

8.4

Reverse polarity protection

In Reverse Polarity (also known as Reverse Battery) condition, power dissipation is caused by the intrinsic body

diode of each DMOS. 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 16. 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

TJ = 25 °C

0.7

1.3

L9026

Over temperature protection

DS13397 - Rev 5

page 29/60

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