MFS5600AMBA0ES datasheet(33/111 Pages) NXP

33 / 111 page

NXP Semiconductors

FS5600

Automotive buck regulator and controller with voltage monitors and watchdog timer

15.2 EN1 and EN2

EN1 and EN2 pins are used to enable SW1 and SW2 respectively. In addition to the EN1

and EN2 pins, the bits SW1_EN and SW2_EN ultimately determine if SW1 or SW2 are

enabled. This allows enable and disable of SW1 and SW2 to be performed through their

respective ENx pin, or via the respective I2C bit SWx_EN.

SW1 regulator is disabled if (EN1 pin = LOW).

SW1 regulator is disabled if (EN1 pin = HIGH AND SW1_EN = 0).

SW1 regulator is enabled if (EN1 pin = HIGH AND SW1_EN = 1).

SW2 regulator is disabled if (EN2 pin = LOW).

SW2 regulator is disabled if (EN2 pin = HIGH AND SW2_EN = 0).

SW2 regulator is enabled if (EN2 pin = HIGH AND SW2_EN = 1).

SW1/2_EN are initialized to 1.

When OTP_SW1_PULLDN_B = 0, a pulldown resistor of 500 Ω is engaged on the output

if SW1 is disabled. Similarly, when OTP_SW2_PULLDN_B = 0, a pulldown resistor of

500 ohm is engaged on the output if SW2 is disabled. The output is disabled in high-Z if

OTP_SWx_PULLDN_B = 1.

15.2.1 Programming turn-off delay

When OTP_SW1_OFF_DELAY = 0, SW1 is turned off after EN1 goes low.

When OTP_SW2_OFF_DELAY = 0, SW2 is turned off after EN2 goes low.

When OTP_SW1_OFF_DELAY = 1, SW1 is turned off 32 ms after EN1 goes low.

When OTP_SW2_OFF_DELAY = 1, SW2 is turned off 32 ms after EN2 goes low.

The 32 ms setting is useful when other devices are to be powered down in the system

prior to turning off the pre-regulators.

15.3 PGOOD1 and PGOOD2

For the QM variation of FS5600, PGOOD1 is used to indicate the voltage regulation

status of SW1 and PGOOD2 is used to indicate the voltage regulation state of SW2.

PGOOD1 is asserted low when the OV or UV monitor for SW1 indicates a faulty voltage.

See Table 8 for OV/UV thresholds. PGOOD2 is asserted low when the OV or UV monitor

for SW2 indicates a faulty voltage. See Table 18 for OV/UV thresholds.

The delay from SW1/2 reaching regulation to PGOOD1/2 being released high is

programmable. See Section 15.4 for details.

PGOOD1 and PGOOD2 are open-drain outputs and need an external pullup resistor.

For the ASIL B, and Enhanced ASIL B variations, behavior of PGOOD1 and PGOOD2

can be programmed to indicate status of other safety functions. See Section 17.6 for

details.

15.4 GPIO1/2/3

Pins 4, 14 and 13 are available as GPO1, GPO2, and GPO3 respectively in the QM

variation. They can be sequenced as part of the device power up to control external

FS5600

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 3 — 2 August 2022

33 / 111

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