MFS5600AMBA0ES datasheet(25/111 Pages) NXP

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NXP Semiconductors

FS5600

Automotive buck regulator and controller with voltage monitors and watchdog timer

OTP_SW2_VOLT[5:0]

SW2 voltage setting (V)

111000

1 (Use External Resistor Divider)

111001

Reserved. Do not use.

111010

Reserved. Do not use.

111011

Reserved. Do not use.

111100

Reserved. Do not use.

111101

Reserved. Do not use.

111110

Reserved. Do not use.

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.

FS5600

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

Product data sheet

Rev. 3 — 2 August 2022

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