MFS5600AMBAFES datasheet(28/118 Pages) NXP

28 / 118 page

NXP Semiconductors

FS5600

Automotive buck regulator and controller with voltage monitors and watchdog timer

OTP_SW2_VOLT[5:0]

SW2 voltage setting (V)

111111

Reserved. Do not use.

Table 22. OTP_SW2_VOLT[5:0] Selection...continued

12.2.3 Pulse skipping operation

At high VIN/VOUT ratio with high switching frequency, the controller may start to skip pulses to maintain

regulation. The minimum on-time of high side FET is programmable via the OTP_SW2_TON_MIN[1:0] bits.

OTP_SW2_TON_MIN[1:0]

SW2 minimum on-time (ns)

45 (recommended for 450 kHz operation)

25 (recommended for 2.2 MHz operation)

Table 23. OTP_SW2_TON_MIN[1:0] Selection

12.2.4 PFM operation

When the OTP_MODE_SYNCINB bit = 0, the MODE/SYNCIN pin is configured as a SYNCIN input. In

this case, switching mode of SW2 can be selected using the SW2_MODE[1:0] bits. The default value of

SW2_MODE[1:0] is loaded from OTP_SW2_MODE[1:0].

OTP_SW2_MODE[1:0]

SW2_MODE[1:0]

SW2 operating mode

PFM

Reserved. Do not use.

PWM

Table 24. SW2_MODE[2:0] selection

When the OTP_MODE_SYNCINB bit = 1, the MODE/SYNCIN pin is configured as a MODE input that can be

used to select the operating mode of SW2 between PWM (MODE = 0) and PFM (MODE = 1). Do not use the

SW2_MODE[1:0] to change the operating mode to avoid conflicts between the pin and the register bits.

On-time of the pulses in PFM mode is configurable using the OTP_SW2_PFM_TON[1:0] bits.

OTP_SW2_PFM_TON[1:0] = 0b10 offers a good compromise between quiescent current and the output ripple

for most applications.

OTP_SW2_PFM_TON[1:0]

SW2 PFM on-time (ns)

120

210

300

550

Table 25. OTP_SW2_PFM_TON[1:0] Selection

FS5600

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

Product data sheet

Rev. 4 — 29 April 2024

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