MFS5600AMBA0ES datasheet(19/111 Pages) NXP

19 / 111 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

Table 18. SW2 electrical characteristics

FS5600

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

Product data sheet

Rev. 3 — 2 August 2022

19 / 111

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