MFS5600AMBAFES datasheet(24/118 Pages) NXP

24 / 118 page

NXP Semiconductors

FS5600

Automotive buck regulator and controller with voltage monitors and watchdog timer

Switching

frequency

Load

current

High-side MOSFET

Low-side MOSFET

< 5 A

Qg < 10 nC

Rds(on) < 40 mΩ

Example: BUK9K18-40E

Qg < 20 nC

Rds(on) < 20 mΩ

Example: BUK9K18-40E

< 8 A

Qg < 10 nC

Rds(on) < 25 mΩ

Example: NVTFS5C471NL

Qg < 20 nC

Rds(on) < 15 mΩ

Example: NVTFS5C471NL

450 kHz

> 8 A

Qg < 10 nC

Rds(on) < 10 mΩ

Example: BUK9M9R5-40H

Qg < 20 nC

Rds(on) < 4 mΩ

Example: BUK9M3R3-40H

2.2 MHz

< 5 A

Qg < 10 nC

Rds(on) < 30 mΩ

Example: BUK9M20-40H

Qg < 20 nC

Rds(on) < 20 mΩ

Example: BUK9M20-40H

Table 20. MOSFET selection

See Section 14.4 for switching frequency selection.

12.2.1.1 Compensation network

SW2 is compensated externally using an R-C (Rcomp-Ccomp) network from SW2COMP to Ground. A high

frequency capacitor (Chf) placed from SW2COMP to Ground can be used in addition to the R-C network.

Refer to the table below for recommended compensation values for typical use case conditions.

Vout(V)

Switching frequency (kHz) Slope compensation

(OTP_SW2_

SLOPECOMP[5:0])

Rcomp

kΩ

Ccomp

Chf

3.3

450

0x04

1.5

5.0

450

0x08

2.3

3.3

2200

0x0D

8.0

Open

5.0

2200

0x20

Open

1.8

450

0x02

0.8

100

150

Table 21. SW2 Compensation selection

Select logical level NMOS (threshold voltage < 2.5 V). Use closest standard values for resistor and capacitors.

The gate drive comes from VCC (5 V).

12.2.1.2 Inductor current sense selection

12.2.1.2.1 Using current sense resistor

For low and medium output currents ( < 8 A), current sense can be done using a shunt resistor Rshunt in series

with the SW2 inductor LSW2, as shown in Figure 9 below.

FS5600

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

Product data sheet

Rev. 4 — 29 April 2024

24 / 118

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