MP2884A datasheet(13/107 Pages) MPS

13 / 107 page

MP2884A – DIGITAL PWM CONTROLLER WITH PMBUS AND PWM-VID

MP2884A Rev. 1.01

www.MonolithicPower.com

12/25/2018

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

OPERATION

The MP2884A is a single-output, digital, multi-

phase voltage regulator (VR) controller for high-

performance GPU or CPU. It supports PWM-

VID’s controllable VOUT reference and is

compliant

with

NVIDIA’s

Open

VReg

specification.

The MP2884A uses MPS’s unique loop

compensation strategy to balance and optimize

steady and transient performance. It also

adopts adaptive phase-shedding and phase-

adding strategies to optimize the overall VR

efficiency according to the load current.

The MP2884A contains precision DAC and

ADC, differential remote voltage sense amplifier,

fast comparators, current-sense amplifiers,

internal slope compensation, digital load-line

setting, power good monitor, and temperature

monitor.

The MP2884A provides rich programmable

functions with the PMBus 1.3 interface. On-chip

EEPROM

flexible

for

storing

custom

configurations and auto-records the fault type

when a protection occurs.

Fault protection features include VIN under-

voltage lockout (UVLO), VIN over-voltage

protection (OVP), VOUT OVP, VOUT under-

voltage protection (UVP), VOUT reverse-voltage

protection (RVP), output over-current protection

(OCP), and over-temperature protection (OTP).

PMBus-programmable functions include phase

assignment, switching frequency, reference

voltage, loop stability parameters, protection

thresholds and behaviors, load-line parameters,

and so on.

The MP2884A can also detect the fault type of

the Intelli-Phase when a protection occurs. The

MP2884A can record all faults into the

EEPROM automatically in case the power

supply shuts off while the fault is occurring.

The MP2884A system state machine is shown

in Figure 2.

Figure 2: System State Machine

PWM Control and Switching Frequency

The MP2884A applies MPS’s unique digital

pulse-width modulation (PWM) control to

provide fast load transient response and easy

loop compensation. The switching frequency

can be set with the PMBus command MFR_FS

(BDh).

The PWM on time of each phase updates in

real time according to the input voltage, output

voltage, and the phase switching frequency

adaptively. TON can be calculated with Equation

(1):

OUT





(1)

MP2884A Datasheet(PDF) 13 Page - Monolithic Power Systems

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