L9305 datasheet(14/107 Pages) STMICROELECTRONICS

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Power supply

5.1

Overview

The L9305 has multiple supply pins. Internal circuits are powered from VDD (+5 V) and VBATP (reverse battery

protected) while digital I/O pins are powered from VDDIO (3.3 V or 5 V) for consistency with the main

microcontroller I/O operation. The charge pump regulator is sourced from VBATP and supplies the necessary

voltage source for the high side integrated valve drivers and fail safe pre-drivers.

5.2

Battery supply (VBATP)

This pin is the supply for the charge pump and must be connected to the reverse polarity protected battery

voltage supply. VBATP input voltage is diagnosed for over voltage conditions. The status of this diagnostic is

readable by SPI. Refer to Section 8.1.2: VBATP supply over voltage for additional information. The following table

summarizes the functional ranges dependent on battery supply voltage.

Table 8. VBATP electrical performance

Symbol

Parameter

Test condition

Min Typ Max Unit

VBATP operational

Normal operating voltage range(1)

Tamb = 40 °C, 4.75 V ≤ VDD ≤ 5.5 V

5.5

–

Tamb = 27 °C, 4.75 V ≤ VDD ≤ 5.5 V

5.55

–

Tamb = 125 °C, 4.75 V ≤ VDD ≤ 5.5 V

5.6

–

VBATP double/load dump High voltage range(2)

Tamb ≤ 50 °C, 4.75 V ≤ VDD ≤ 5.5 V

–

VBATP over voltage

Over voltage range(3)

Tamb ≤ 50 °C, 4.75 V ≤ VDD ≤ 5.5 V

–

VBATP low voltage

Low Voltage Range Cranking(4)

Tamb = -40 °C, 4.75 V ≤ VDD ≤ 5.5 V

–

5.5

Tamb = 27 °C, 4.75 V ≤ VDD ≤ 5.5 V

–

5.55

Tamb = 125 °C, 4.75 V ≤ VDD ≤ 5.5 V

–

5.6

1. Device is capable of full functional operation; VBATP must be reversed battery protected

2. Device is capable of full functional operation at Ta ≤ 50 °C with possible degradation of electrical parameters linked to

battery line (ex. solenoid slew rate control and current regulation accuracy); There will be no damage to the device, no false

operation and input pins will withstand voltage and current defined in Absolute ratings regardless of battery voltage range.

Full functional operation will resume without operator intervention when battery voltage returns to Normal Operating Voltage

Range at Ta ≤ 50 °C.

3. Ta ≤ 50 °C, duration less than 500 ms. There will be no damage to the device, Solenoid channels and Fail Safe switch will

be disabled and input pins will withstand voltages and currents defined in Absolute ratings regardless of battery voltage

range. Full functional operation will resume with operator intervention, as described in the specification, when battery

voltage returns to normal operating voltage range.

4. Device is capable of full functional operation until charge pump is out of under voltage condition with possible degradation of

electrical parameters linked to battery line (ex. solenoid slew rate control and current regulation accuracy). Full functional

operation will resume without operator intervention when battery voltage returns to normal operating voltage range.

5.3

Load supplies (VSOL1, VSOL2, VSOL3 & VSOL4)

The VSOLx pins are connected to the high side of the solenoid load when the output drivers are configured for

low side operation. In low side operation, VSOLx provides power to the load and recirculation path through the

high side driver. When the output drivers are configured for high side operation, the VSOLx pin becomes the

power source for driving the load thru the high side solenoid driver transistor. In this case, load current is

recirculated through the corresponding low side driver. VSOLx pins are independent for each solenoid driver

channel. Solenoid driver operation and configuration are detailed in Section 6.4: Solenoid driver and load

diagnostic.

L9305

Power supply

DS12774 - Rev 10

page 14/107

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