MFS5600AMBAFES datasheet(23/118 Pages) NXP

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NXP Semiconductors

FS5600

Automotive buck regulator and controller with voltage monitors and watchdog timer

Parameter

Symbol

Min

Typ

Max

Unit

PWM Switching Frequency Range (Programmable via OTP)

fsw

300

—

2400

kHz

Error Amplifier Transconductance (COMP = 0.9 V)

1.5

2.3

N-Channel MOSFET Gate Drivers

High/ Low Side Driver Pull-up Resistance at Vds = 0.5 V

OTP_SW2_HS_SR[3:2]/OTP_SW2_LS_SR[1:0] = 00

OTP_SW2_HS_SR[3:2]/OTP_SW2_LS_SR[1:0] = 01

OTP_SW2_HS_SR[3:2]/OTP_SW2_LS_SR[1:0] = 10

OTP_SW2_HS_SR[3:2]/OTP_SW2_LS_SR[1:0] = 11

RSW2PUP —

5.6

2.8

1.6

—

Ω

High/ Low Side Driver Pull-Down Resistance at Vds = 0.5 V

OTP_SW2_HS_SR[1:0]/OTP_SW2_LS_SR[1:0] = 00

OTP_SW2_HS_SR[1:0]/OTP_SW2_LS_SR[1:0] = 01

OTP_SW2_HS_SR[1:0]/OTP_SW2_LS_SR[1:0] = 10

OTP_SW2_HS_SR[1:0]/OTP_SW2_LS_SR[1:0] = 11

RSW2PDN —

6.8

3.4

1.7

—

Ω

Discharge Resistance (at the output) during regulator disable

RSW2DIS —

500

—

Ω

EN2 pin rising threshold

EN2RTH

1.4

—

EN2 pin falling threshold

EN2FTH

—

0.95

SW2 monitor over voltage threshold (% of nominal)

—

SW2 monitor under voltage threshold (% of nominal)

—

–15

—

–5

SW2 monitoring hysteresis (measured at mid-point of resistor divider)

—

SW2 monitoring debounce

—

µs

Table 18. SW2 electrical characteristics...continued

12.2 SW2 operation

SW2 is a peak current-mode controller plus driver with external current sense. The driver is built to drive low

Rds(on) N-channel high and low side MOSFETs for low cost and high efficiency.

12.2.1 SW2 external component selection

Table 19 provides the recommended external components for the SW2 regulator.

Components

Switching frequency < 1 MHz

Switching frequency > 1 MHz

Inductor

4.7 µH

1.5 µH

Output Capacitor

3 x 22 µF to 5 x 22 µF X5R/X7R

Bootstrap Capacitor

0.1 µF

Input Capacitor

2 x 10 µF X5R/X7R

1 x 10 µF X5R/X7R

Table 19. SW2 recommended external components

Choose VDS > 40 V for 12 V automotive applications. At high current (> 8 A), each MOSFET should be

selected in a single package to limit the heat exchange between HS and LS. Dual MOSFETs in the same

package are practical for low and mid current (< 8 A). When operating at 450 kHz or lower, by choosing low

Rds(on) MOSFETs in separate packages, and with a low DCR inductor, SW2 can be designed to support loads

of up to 15 A. Refer to the schematic of KITFS5600FRDMEVM for a design that can support 15 A.

See Table 20 for guidance on the MOSFET selection.

FS5600

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

Product data sheet

Rev. 4 — 29 April 2024

23 / 118

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