FS6407 datasheet(52/111 Pages) NXP

52 / 111 page

NXP Semiconductors

FS6407/FS6408

Figure 36. VAUX current limitation scheme with foldback mechanism

6.7.5.2

Voltage monitoring

The overvoltage detection switches OFF the regulator. The regulator remains ON in case of an undervoltage detection. A diagnostic is

reported in the dedicated register, generating an Interrupt, and may bring the application into Fail-safe state depending on the supervisor

configuration (registers INIT SUPERVISOR 1, 2, 3).

6.7.6

CAN_5V voltage regulator

The CAN_5V voltage regulator is a linear regulator fully dedicated to the internal HSCAN interface. By default, the CAN_5V regulator and

the undervoltage detector are enabled, and the overvoltage detector is disabled. The overvoltage detector can be enabled by the SPI

during INIT_MAIN sate.

If the overvoltage detector is enabled, the CAN_5V regulator switches OFF when an overvoltage is detected. The undervoltage detector

is disabled when the regulator is switched OFF reporting an undervoltage. A diagnostic is reported in the dedicated register, generating

an Interrupt. The CAN_5V regulator is not a safety regulator. Consequently, the CAN_5V voltage monitoring (overvoltage, undervoltage)

never asserts RSTB or the FS0B Fail-safe pins.

If the FS6407/FS6408 internal CAN transceiver is not used in the application, the CAN_5V regulator can be used to supply an external

load, provided the current load remains below the maximum current capability in all conditions. In that case, the internal CAN transceiver

must be put in Sleep mode without wake-up capability.

6.7.7

Power dissipation

The FS6407/FS6408 provides high performance SMPS and Linear regulators to supply high end MCU in industrial applications. Each

regulator can deliver:

•VPRE (6. 5V) up to 2.0 A

•VCORE (from 1.2 V to 3.3 V range) up to 0.8 A (FS6407) or up to 1.5 A (FS6408)

•VCCA (3.3 V or 5.0 V) up to 100 mA (with internal MOS) or up to 300 mA (with external PNP)

•VAUX (3.3 V or 5.0 V) up to 300 mA (with external PNP)

•VCAN (5.0 V) up to 100 mA

A thermal dissipation analysis has to be performed based on application use case to ensure the maximum silicon junction temperature

does not exceed 150 °C.

Two use cases covering the two main VCORE voltage configurations are provided in Figure 37.

• use case 1: VCORE = 3.3 V, ICORE = 0.7 A, VCCA with int. MOS

• use case 2: VCORE = 1.2 V, ICORE = 1.4 A, VCCA with ext. PNP

Both use cases have a total internal power dissipation below 0.9 W. A junction to ambient thermal resistivity of 30 °C/W allows the

application to work up to 125 °C ambient temperature. A good soldering of the package expose pad is highly recommended to achieve

such thermal performance.

Iaux_LIM

Iaux_LIM_FB

IAUX

VAUX

Vaux

(3.3Vor

5V)

Vaux_LIM_FB

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