MFS5600AMBA0ES datasheet(10/111 Pages) NXP

10 / 111 page

NXP Semiconductors

FS5600

Automotive buck regulator and controller with voltage monitors and watchdog timer

11 SW1: 36 V Integrated FET DC-DC Converter

SW1 is a 3 A integrated FET DC DC converter. Load currents of up to 3.5 A may be

drawn without entering current limit. Figure 6 shows a high-level block diagram of SW1.

aaa-037154

SW1BOOT

SW1LX

SW1IN

EN1

CONTROL,

DRIVER

AND

LOGIC

VCC

SW1FB

PGND

(EPAD)

SW1LX

Figure 6. SW1 high-level block diagram

SW1IN pins provide input power to the MOSFETs, and VCC provides the voltage needed

to drive the MOSFET gates. EN1 controls the enable of the SW1 regulator.

11.1 SW1 electrical specifications

All parameters are specified at Tj = –40 °C to 150 °C, VSW1IN = 6 V to 18 V, Vout = 5 V,

typical external component values, unless otherwise noted. Typical parameters are

specified at VSW1IN = 12 V, Tj = 25 °C unless otherwise noted.

Parameter

Symbol

Min

Typical Max

Units

Output Voltage Accuracy

(PWM mode, SW1IN = 6 V to 18 V, 0 A <= ISW <= Rated A, minimum

2 V headroom, Vout = 1.8 V to 5.5 V using internal resistor divider)

VSW1ACC

–2

—

Output Voltage Accuracy in Dropout:

(PWM mode, SW1IN = 6 V to (Vout+2 V), 0 A <=ISW <= Rated A, 25C,

Vout <= 5 V, 450 kHz)

VSW1ACCDO -3

—

Output Voltage Accuracy

(Internal resistor divider, PFM mode, Load = 10 mA)

VSW1ACC

–3

—

Reference accuracy when using external resistor divider

VSW1ACC

0.99

1.01

Rated load current (PWM mode)

VSW1LOAD

—

Soft-start time (all output voltages)

(Measured from 0 % to 90 % of Vout)

OTP_SW1_SS = 00

OTP_SW1_SS = 01

OTP_SW1_SS = 10

OTP_SW1_SS = 11

tss

—

337

675

1350

2700

500

1000

2000

4000

Operating frequency range (selectable via OTP)

SW1FSW

250

—

3000

kHz

Table 8. SW1 electrical specifications

FS5600

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

Product data sheet

Rev. 3 — 2 August 2022

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