MFS5600AMBAFES datasheet(15/118 Pages) NXP

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NXP Semiconductors

FS5600

Automotive buck regulator and controller with voltage monitors and watchdog timer

Parameter

Symbol

Min

Typical Max

Units

Peak current limit

OTP_SW1_ILIM_SEL[1:0] = 00

OTP_SW1_ILIM_SEL[1:0] = 01

OTP_SW1_ILIM_SEL[1:0] = 10

OTP_SW1_ILIM_SEL[1:0] = 11

SW1ILIM

1.5

3.8

2.5

4.1

4.9

6.5

3.5

5.2

6.5

High side MOSFET RDS(on)

(Vin = 12 V, VCC = 5 V, ID = 2.5 A), including bondwires

HSRDS(ON) —

105

—

mΩ

Low side MOSFET RDS(on)

(Vin = 12 V, VCC = 5 V, ID = 2.5 A), including bondwires

LSRDS(ON) —

—

mΩ

EN1 pin rising threshold

EN1RTH

1.4

—

EN1 pin falling threshold

EN1FTH

—

0.95

SW1 monitor over voltage threshold (% of nominal)

—

SW1 monitor under voltage threshold (% of nominal)

—

–15

—

–5

SW1 monitoring hysteresis (measured at mid-point of resistor divider)

—

SW1 monitoring debounce

—

Table 8. SW1 electrical specifications...continued

11.2 SW1 external component selection

Table 9 provides the recommended external components for the SW1 regulator.

Components

Switching frequency < 1 MHz

Switching frequency > 1 MHz

Inductor

6.8 µH

1.5 µH

Output Capacitor

2 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 9. SW1 external component selection

See Section 14.4 for switching frequency selection.

11.3 SW1 operation

SW1 is a peak current mode controlled regulator with internal current sense. It integrates low Rds(on) N-FETs

for high efficiency and low solution cost.

11.3.1 Output voltage selection

The output voltage of SW1 may be set via OTP using the OTP_SW1_VOLT[7:0] bits.

OTP_SW1_VOLT[7] = 0b0 sets the output voltage using an internal resistor divider via OTP. Connect the

SW1FB pin directly to the output voltage in this case.

OTP_SW1_VOLT[7] = 0b1 allows using an external resistor divider to set the output voltage. In this case,

connect the SW1FB pin to the output voltage via a resistor divider. The gain of the resistor divider sets the

output voltage as shown in Figure 7. Set R1 = 10 kΩ and calculate R2 such that VOUT × [ R2 / (R1 + R2) ] = 1

V. Ensure that OTP_SW1_VOLT[7:0] is set to the appropriate value from Table 10 as the slope compensation is

calculated internally based on the output voltage.

FS5600

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

Product data sheet

Rev. 4 — 29 April 2024

15 / 118

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