MFS5600AMBA0ES datasheet(16/111 Pages) NXP

16 / 111 page

NXP Semiconductors

FS5600

Automotive buck regulator and controller with voltage monitors and watchdog timer

On-time of the pulses in PFM mode is configurable using the OTP_SW1_PFM_TON[1:0]

bits. OTP_SW1_PFM_TON[1:0] = 0b10 offers a good compromise between quiescent

current and the output ripple for most applications.

OTP_SW1_PFM_TON[1:0]

SW1 PFM on-time (ns)

160

320

640

800

Table 13. OTP_SW1_PFM_TON[1:0] selection

11.3.4 Soft-start

The startup of SW1 is internally controlled to eliminate overshoot and control the inrush

current. The soft-start time is programmable via OTP using the OTP_SW1_SS[1:0] bits.

See Table 8 for values.

11.3.5 Current limit protection

Cycle-by-cycle current limit is utilized to limit the total permissible output current. Output

voltage returns to regulation when the overcurrent is removed. The current limit value is

programmable to four different values via OTP using the OTP_SW1_ILIM_SEL[1:0] bits.

See Table 8 for values.

11.3.6 Compensation selection

OTP_SW1_SLOPECOMP[1:0], OTP_SW1_PWM_R_COMP[2:0], and

OTP_SW1_GM_COMP[1:0] select the loop parameters for SW1. See Table 14 for

recommended values for different operating conditions. Use interpolation for values

between the ones shown in Table 14.

Switching

frequency

Output voltage

Output

capacitance

OTP_SW1_

SLOPECOMP[1:0]

OTP_SW1_PWM_

R_COMP[2:0]

OTP_SW1_GM_

COMP[1:0]

450 kHz

3.3 V

2 x 22 μF

000

450 kHz

3.3 V

5 x 22 μF

000

2.2 MHz

3.3 V

2 x 22 μF

000

2.2 MHz

3.3 V

5 x 22 μF

010

450 kHz

4.0 V

2 x 22 μF

000

450 kHz

4.0 V

5 x 22 μF

000

2.2 MHz

4.0 V

2 x 22 μF

000

2.2 MHz

4.0 V

5 x 22 μF

010

450 kHz

5.0 V

2 x 22 μF

000

450 kHz

5.0 V

5 x 22 μF

000

2.2 MHz

5.0 V

2 x 22 μF

010

2.2 MHz

5.0 V

5 x 22 μF

010

Table 14. SW1 compensation selection

FS5600

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

Product data sheet

Rev. 3 — 2 August 2022

16 / 111

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