MFS5600AMMA8ES datasheet(28/111 Pages) NXP

28 / 111 page

NXP Semiconductors

FS5600

Automotive buck regulator and controller with voltage monitors and watchdog timer

OTP_SW2_SLOPECOMP[5:0]

SW2 slope compensation (mV/µs)

110100

938

110101

958

110110

979

110111

999

111000

1020

111001

1041

111010

1061

111011

1082

111100

1103

111101

1124

111110

1124

111111

1144

Table 26. OTP_SW2_SLOPECOMP[5:0] selection...continued

12.2.8 SW2 fault monitoring

SW2FB pin voltage is compared against an internal reference to detect overvoltage and

undervoltage faults in SW2. See Table 18 for monitoring thresholds.

When OTP_SW2_OV_PGOOD1 = 1, an overvoltage fault on SW2 asserts PGOOD1.

Similarly, when OTP_SW2_OV_PGOOD2 = 1, an overvoltage fault on SW2 asserts

PGOOD2.

When OTP_SW2_UV_PGOOD1 = 1, an undervoltage fault on SW2 asserts PGOOD1.

Similarly, when OTP_SW2_UV_PGOOD2 = 1, an undervoltage fault on SW2 asserts

PGOOD2.

The SW2_UV_I and SW2_OV_I bits are latched to 1 respectively if undervoltage and

overvoltage faults are detected. The latch bits can be cleared by writing a 1 to them.

SW2_UV_RT and SW2_OV_RT read-only bits indicate the real-time status of the faults.

13 BIAS_IN Input

An external voltage between 3.7 V and 5.5 V can be applied at the BIAS_IN pin to reduce

power consumption in the FS5600. When a valid voltage at BIAS_IN is detected, VCC

is powered directly from the BIAS_IN path, eliminating the power dissipation in the high-

voltage LDO from VIN to VCC.

In the application, if either SW1 or SW2 is set to 5.0 V on the output, NXP recommends

connecting that output to BIAS_IN. If an external 5 V is available in the system, that may

be connected to BIAS_IN. Ensure that the BIAS_IN voltage does not exceed 5.5 V.

14 FS5600 Clock Management

The clock management system provides a top-level management control scheme of

internal clock and external synchronization intended to be used primarily for the switching

regulators. The clock management system incorporates various sub-blocks:

FS5600

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

Product data sheet

Rev. 3 — 2 August 2022

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