MFS5600AMBA0ES datasheet(57/111 Pages) NXP

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NXP Semiconductors

FS5600

Automotive buck regulator and controller with voltage monitors and watchdog timer

17.13.9 Low-power operation

There are several ways to reduce the quiescent current consumption of the FS5600.

These are:

• Turning off SW1 and SW2 (via I2C, or using EN1/2 pins)

• Changing SW1 and SW2 operation mode from PWM to Auto Skip or PFM mode.

The operation mode of SW1 and SW2 may be changed using I2C or by using the MODE

pin.

17.13.9.1 Ultra low-power operation

When (MODE pin =1) AND (OTP_MODE_SYNCINB_SEL[1:0] = 00) AND

(OTP_ULPM_EN = 1), the FS5600 achieves further reduction in quiescent current by

turning off the internal 20 MHz clock. In this condition, I2C access is not available, the

watchdog timer function is not available and external voltage monitors (VMON1-4)

are disabled. PGOOD pins assigned to the external voltage monitors (VMON1-4) are

asserted low. If the respective regulator is enabled, voltage monitors for SW1 and SW2

regulators remain enabled. The OTP_ULPM_EN bit is set to 1 in the QM version of

FS5600. The user may choose its value in ASIL B and Enhanced ASIL B versions.

17.13.10 State transition table

Transition

Description

Transition conditions

Power up to INIT_RUN

Completion of SW1 soft-start (if EN1 = high)

Completion of SW2 soft-start (if EN2 = high)

Expiration of largest delay among OTP_GPOx_DELAY[2:0] (if GPIOx pin

used as GPO AND OTP_GPOx_DELAY[2:0] NOT EQUAL to 0b000)

Note: If one regulator is disabled, its soft-start completion signal is ignored

as a condition for this state transition.

Table 53. State transition table

FS5600

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Product data sheet

Rev. 3 — 2 August 2022

57 / 111

MFS5600AMBA0ES датащи(PDF) 57 Page - NXP Semiconductors