MP2886A datasheet(28/113 Pages) MPS

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MP2886A – DIGITAL PWM CONTROLLER WITH PMBUS AND PWM-VID

MP2886A Rev. 1.0

www.MonolithicPower.com

1/21/2019

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

Phase Number Configuration

The MP2886A can be configured to different

phase numbers via the PMBus register or by

CSx (see Table 4).

Table 4: Phase Number Configuration and

Activated PWM Pins

PHASE_CNT (E1h)

Activated PWM Pins

PWM1

PWM1~2

PWM1~3

PWM1~4

PWM1~5

PWM1~6

If PHASE_CNT is set to 0, the MP2886A

operates in 1-phase DCM.

Any unused PWM pin enters tri-state, and the

activated phases interleave automatically. Float

the unused PWM pins. For the Intelli-Phase, if

the PWM input is in Hi-Z, the SW node is in Hi-Z

as well.

If the CS pins are enabled to program the phase

number, the register setting in E1h is ignored.

Pull down the unused CS pins to ground. After

EN is pulled high, the MP2886A checks the

voltage on the CS pins sequentially from CS1 to

CS6 until it finds the first low voltage. Figure 15

shows an example of the connection for 3-phase

applications. The first low voltage is on CS4.

CS1

CS2

CS3

CS4

CS5

CS6

CSSUM

To Dr.Mos

GND

Figure 15: CS Pins Program to 3-Phase

Figure 16 shows the connection for 2-phase

applications in couple-inductor mode.

CS1

CS2

CS3

CS4

CS5

CS6

CSSUM

To Dr.Mos

GND

Figure 16: CS Pins Configure for 2-Phase in

Couple-Inductor Mode

The MP2886A supports couple-inductor mode to

reduce the overshoot during load releasing.

Table 5 shows the relation of coupled phases.

Table 5: Coupled Phases Group Requirement

Couple Group

Phase Number

Phase 1, Phase 6

2-Ph

Figure 17 shows a connection example of 6-

phase couple-inductor application.

Vout

SW1

SW6

Figure 17: Couple Inductor Connection

The

MP2886A

supports

the

auto-phase-

shedding function for couple-inductor mode to

flatten the overall VR efficiency. When the phase

number drops to only one phase at light load,

PWM6 is pulled low simultaneously with PWM1

to let the coupled current from phase one flow

through the low-side MOSFET of phase six

instead of the bode diode of phase six to improve

the efficiency at light load (see Figure 18).

PWM1

PWM6

Tri-state

2 phase CCM shedding

to 1 phase CCM

Figure 18: Phase Shedding to 1-Phase CCM

MP2886A Datasheet(PDF) 28 Page - Monolithic Power Systems

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