MFS5600AMBA0ES datasheet(11/111 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

FS5600

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

Product data sheet

Rev. 3 — 2 August 2022

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