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Phase and Output Configuration

The MAX77542 has four 4A switching phases configurable to five phase configurations. As shown in Table 5, the buck

converters are configured from a single output (4Φ) to four individual outputs (1Φ + 1Φ + 1Φ + 1Φ) based on resistor

values on the SELx inputs.

Table 5. Phase-Configuration Selection

RSEL1 (Ω)

RSEL2 (Ω)

RSEL3 (Ω)

RSEL4 (Ω)

PHASE (Φ) CONFIGURATION

NUMBER OF OUTPUTS

Any

≥ 200

1Φ + 1Φ + 1Φ + 1Φ

Any

≤ 95.3

≥ 200

2Φ + 1Φ + 1Φ

Any

≤ 95.3

≥ 200

≤ 95.3

2Φ + 2Φ

Any

≤ 95.3

≥ 200

3Φ + 1Φ

Any

≤ 95.3

4Φ

Also, the output-voltage sensing of the buck converters is assigned based on the phase-configuration setting. In

multiphase configurations, the buck controllers regulate the output voltage using the differential output-voltage sensing

inputs (SNSxP/SNSxN) of the master phases. Table 6 shows how the output-voltage sensing inputs are configured for

each phase configuration.

Table 6. Buck Output-Voltage Sensing Assignment

PHASE (Φ) CONFIGURATION

PHASE ASSIGNED*

BUCK NAMING CONVENTION

VOUT SENSING INPUT

1Φ + 1Φ + 1Φ + 1Φ

(4 Outputs)

Phase1 (M1)

Buck1 (VOUT1)

SNS1P/SNS1N

Phase2 (M2)

Buck2 (VOUT2)

SNS2P

Phase3 (M3)

Buck3 (VOUT3)

SNS3P/SNS3N

Phase4 (M4)

Buck4 (VOUT4)

SNS4P

2Φ + 1Φ + 1Φ

(3 Outputs)

Phase1 (M1)

Phase2 (S1)

Buck1 (VOUT1)

SNS1P/SNS1N

Phase3 (M3)

Buck3 (VOUT3)

SNS3P/SNS3N

Phase4 (M4)

Buck4 (VOUT4)

SNS4P

2Φ + 2Φ

(2 Output)

Phase1 (M1)

Phase2 (S1)

Buck1 (VOUT1)

SNS1P/SNS1N

Phase3 (M3)

Phase4 (S3)

Buck3 (VOUT3)

SNS3P/SNS3N

3Φ + 1Φ

(2 Output)

Phase1 (M1)

Phase2 (S1)

Phase3 (S1)

Buck1 (VOUT1)

SNS1P/SNS1N

Phase4 (M4)

Buck4 (VOUT4)

SNS4P

4Φ

(1 Output)

Phase1 (M1)

Phase2 (S1)

Phase3 (S1)

Phase4 (S1)

Buck1 (VOUT1)

SNS1P/SNS1N

*Mx = Master phase.

Sx = Slave phase.

In multiphase configurations, the logic I/O pins and the control registers assigned to slave phases are deactivated so that

MAX77542

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

Converter

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