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PH2

PH4

PH3

PH1

3+1

2+2

2+1+1

1+1+1+1

PHASE

CONFIGURATION

M3 M4

NA NA NA

MAX77542

ACTIVE CONTROL

REGISTERS

Figure 6. Active Control Registers

Default Output-Voltage Selection (SELx)

The MAX77542 supports user-selectable default voltages of individual buck outputs with 1% tolerance (or better)

resistors. The MAX77542 evaluates the resistances between the SELx and the AGND whenever the VDD regulator first

turns on (exits shutdown). The decoded values of the RSELx are latched until the next time the device exits shutdown

mode. The SELx_LATCH[4:0] status bits reflect the latched decoded values of the RSELx. See the Register Map section

for more details.

The resistances between the SELx and the AGND (RSELx) configure the default voltages of corresponding buck outputs.

The RSEL2, the RSEL3, and the RSEL4 are also used in selecting phase configuration. When the SEL2, the SEL3, and/or

the SEL4 pins are tied to the AGND on the PCB (RSELx ≤ 95.3Ω), the corresponding buck is configured as a slave phase

of a multiphase converter. See the Phase and Output Configuration section for more information.

In case multiphase configuration is selected, the decoded resistance (RSELx) on the master phase sets the default output

voltage. Table 7 and Table 8 decode the default selection options for the VOUT1, the VOUT2, the VOUT3, and the VOUT4,

respectively. Once latched, the Mx_VOUT_H[7:0], the Mx_VOUT_L[7:0], the Mx_VOUT_B[7:0], and the Mx_RNG[1:0]

bits reflect the selected options. The decoded values for RSELx ≥ 115kΩ are programmable at the factory.

Table 7. Default VOUT1 Selection

RSEL1 (Ω)

TARGET VOUT1 (V)

VOUT1 RANGE

≤ 95.3

0.500

Low

200

0.550

Low

309

0.600

Low

422

0.650

Low

536

0.675

Low

649

0.700

Low

768

0.720

Low

909

0.750

Low

1.05k

0.800

Low

1.21k

0.820

Low

1.40k

0.900

Low

1.62k

0.950

Low

1.87k

1.000

Low

2.15k

1.050

Low

2.49k

1.100

Low

2.87k

1.150

Low

3.74k

1.200

Low

8.06k

1.20

Mid

12.4k

1.25

Mid

16.9k

1.35

Mid

MAX77542

16VIN/16A, Quad-Phase High-Efficiency Buck

Converter

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