MFS5600AMBA0ES datasheet(23/111 Pages) NXP

23 / 111 page

NXP Semiconductors

FS5600

Automotive buck regulator and controller with voltage monitors and watchdog timer

When R1 and C1 are selected in such a way that the RC time constant is equal to the

ratio of inductance and its series resistance, the voltage across C1 is directly proportional

to the inductor current.

R1 × C1 = LSW2 / RDCR

Select R1 = a resistor in the kΩ range or C1 = a capacitor in the range of several hundred

nF, and calculate the other components.

Example: For an inductor L = 4.7 μH and RDCR = 7 mΩ, R1 = 6.7 kΩ and C1 = 100 nF.

With OTP_SW2_ILIM = 0b11, the minimum SW2CSP-SW2CSN voltage where a current

limit occurs is 150 mV. With 7 mΩ DCR, this is equivalent to a peak current limit of 150

mV / 7 mΩ = 21.4 A.

To maintain a proper signal-to-noise ratio, choose an inductor with a DCR of at least 6

mΩ.

12.2.2 Output voltage selection

Output voltage of SW2 may be set via OTP using the OTP_SW2_VOLT[5:0] bits.

OTP_SW2_VOLT[5:0] = 0b111000 configures the device to use an external resistor

divider to set the output voltage. Use the same equation for the external divider as for

SW1.

OTP_SW2_VOLT[5:0]

SW2 voltage setting (V)

000000

1.8

000001

1.9

000010

000011

2.1

000100

2.2

000101

2.3

000110

2.4

000111

2.5

001000

2.6

001001

2.7

001010

2.8

001011

2.9

001100

001101

3.1

001110

3.2

001111

3.3

010000

3.4

010001

3.5

010010

3.6

010011

3.7

Table 22. OTP_SW2_VOLT[5:0] Selection

FS5600

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

Product data sheet

Rev. 3 — 2 August 2022

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