MFS5600AMBA0ES datasheet(15/111 Pages) NXP

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NXP Semiconductors

FS5600

Automotive buck regulator and controller with voltage monitors and watchdog timer

OTP_SW1_VOLT[7:0]

Vout Setting (V)

11010xxx

5 V - 5.35 V with external resistor divider

11011xxx

5.4 V - .5.75 with external resistor divider

11100xxx

5.8 V - 6.15 V with external resistor divider

11101xxx

6.2 V - 6.55 V with external resistor divider

11110xxx

6.6 V - 6.95 V with external resistor divider

11111xxx

7 V - 8 V with external resistor divider

Table 10. OTP_SW1_VOLT[7:0] selection...continued

11.3.2 PFM and pulse skipping operation

At a high VIN/VOUT ratio with high switching frequency, the controller may start to

skip pulses to maintain regulation. The minimum on-time of the high side FET is

programmable via the OTP_SW1_MIN_TON[1:0] bits. OTP_SW1_MIN_TON[1:0] = 0b01

is the recommended default value that is optimal for most applications.

OTP_SW1_MIN_TON[1:0]

SW1 minimum on-time (ns)

60 (recommended)

100

Table 11. OTP_SW1_MIN_TON[1:0] selection

In addition, the controller starts to switch at half of the selected frequency when the VIN/

VOUT ratio is above 6. This allows reduced ripple operation compared to pulse-skipping.

11.3.3 PFM operation

When the OTP_MODE_SYNCINB bit = 0, the MODE/SYNCIN pin is configured

as a SYNCIN input. In this case, the switching mode of SW1 can be selected

using the SW1_MODE[1:0] bits. Default value of SW1_MODE[1:0] is loaded from

OTP_SW1_MODE[1:0].

OTP_SW1_MODE[1:0]

SW1_MODE[1:0]

SW1 operating mode

PFM

Reserved. Do not use.

PWM

Table 12. SW1_MODE[1:0] 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 SW1 between PWM

(MODE = 0) and PFM (MODE = 1). To avoid conflicts between the pin and register bits,

do not use SW1_MODE[1:0] to change the operating mode.

FS5600

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

Product data sheet

Rev. 3 — 2 August 2022

15 / 111

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