MFS5600AMBAFES datasheet(22/118 Pages) NXP

22 / 118 page

NXP Semiconductors

FS5600

Automotive buck regulator and controller with voltage monitors and watchdog timer

12 SW2: 36 V DC-DC controller with external FETs

SW2 is an external FET buck controller. Figure 8 shows a high-level block diagram of SW2. The rated load

current of SW2 is dependent on the external components chosen. With careful selection of the MOSFET,

inductor and current sense circuitry, load currents of up to 15 A can be drawn without entering current limit.

aaa-037155

SWIN

SW2GHS

SW2BOOT

SW2GLS

EN2

SW2CSN

CONTROL,

DRIVER

AND

LOGIC

VCC

SW2FB

SW2LX

SW2CSP

10 µF

4.7 µH

2 x

22 µF

10 mΩ

0.047 µF

Figure 8. SW2 high-level block diagram

12.1 SW2 electrical characteristics

All parameters are specified at Tj = –40 °C to 150 °C, VSW2IN = 6 V to 18 V, Vout = 1.8 V to 7.2 V, typical

external component values, unless otherwise noted. Typical parameters are specified at VSW2IN = 12 V, Tj = 25

°C unless otherwise noted.

Parameter

Symbol

Min

Typ

Max

Unit

Output Voltage Accuracy

(Vout = 1.8 V to 5.5 V, internal resistor divider, PWM mode, Not in

dropout, Vin up to 36 V)

VSW2ACC –3

—

Output Voltage Accuracy

(Internal resistor divider, PFM mode, Vin = 12 V, Load = 0 A to 10 mA)

VSW2ACC –3

—

Reference accuracy for external resistor divider

SW2REF

0.98

1.00

1.02

Soft start Ramp Slew Rate (Measured at EA input. Multiply by Vout

setting for start up time)

OTP_SW2_SS = 0

OTP_SW2_SS = 1

SW2RAMP —

—

mV/

µs

Current Limiter-Inductor Peak Current Sense Voltage in CCM in the

forward direction

OTP_SW2_ILIM[1:0] = 00

OTP_SW2_ILIM[1:0] = 01

OTP_SW2_ILIM[1:0] = 10

OTP_SW2_ILIM[1:0] = 11

VSW2

CSLIM

120

150

100

144

180

Current Limiter-Inductor Peak Current Sense Voltage in CCM (Sense

Resistor 10 mΩ to 20 mΩ) in the reverse direction

VSW2

CSLIM

Table 18. SW2 electrical characteristics

FS5600

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

Product data sheet

Rev. 4 — 29 April 2024

22 / 118

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