MP2886A datasheet(21/113 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.

VTEMP

700mV,

then

the

junction

temperature of the Intelli-Phase is 80°C. Since

VTEMP cannot go below 0V, it reads 0V when

the junction temperature is lower than 10°C.

Refer to the Intelli-Phase datasheet for more

information.

Temperature Sense of the Thermistor

The MP2886A senses the external thermal

component’s temperature by connecting a

thermistor to TSNS (see Figure 10). The sensed

temperature is used for over-temperature fault

protection and over-temperature warning (assert

TALERT#).

ADC

10µA

TSNS

MP2886A

Figure 10: Temperature Sense for MP2886A with

Thermistor

TSNS sources a 10µA current source to the

thermistor, and the MP2886A senses the voltage

of TSNS. The 10µA current source can be

disabled via register TSNS_CURRENT_DIS

(34h bit[10]), and

a voltage signal can be

connected to TSNS as a new defined protection

function.

Note that if the 10µA current source is enabled,

TSNS cannot be floated.

EEPROM Operation

The MP2886A provides an EEPROM to store

custom configurations. A 4-digit part number

suffix is assigned for each application. The

default configuration for each 4-digit part can be

pre-programmed at the MPS factory. The data

can

programmed

again

using

the

STORE_USER_ALL (15h) command via the

PMBus and requires 200ms for the data to be

stored to the EEPROM. The EEPROM is read

automatically during the power-on sequence or

by the RESTORE_USER_ALL (16h) command

via the PMBus and requires at least 300µs for

data to be restored from the EEPROM.

EEPROM operation can be accomplished easily

with MPS GUI software.

The MP2886A uses register DBh to enable

EEPROM write protection.

The EEPROM can be erased or written for more

than 100,000 cycles. When the EEPROM is

write-protected, the EEPROM write action is

ineffective.

EEPROM Fault

If the data from the EEPROM is checked as

invalid by the cyclic redundancy code (CRC)

during the system initialization process, the

system enters an EEPROM fault state without

outputting power and waits for the error clear

command. The configuration from the EEPROM

is ignored.

There are three ways to clear the EEPROM fault

and start up again with the restored value from

the EEPROM:

1. Clear the EEPROM fault via the PMBus

command (FFh).

2. Clear the fault status via the PMBus

command (03h).

3. Store the configuration into the EEPROM

and restart.

Low-Power Mode

The MP2886A can be programmed to operate in

regular-power mode or low-power mode.

regular-power

mode,

the

PMBus

communication is available when EN is low. With

low-power mode enabled, when EN is low, the

PMBus communication is disabled, and the

quiescent current (IQ) can be reduced to 150µA.

Low-power mode is factory-programmable.

Power On

The MP2886A is supplied by a +3.3V voltage at

VDD33. VDD33 provides the bias supply for the

analog circuit and internal 1.8V LDO. The 1.8V

LDO produces the +1.8V supply for the digital

circuit. The system is reset by the internal power-

on reset signal (POR) after the VDD33 supply is

ready. If the MP2886A is in regular-power mode,

EN must be high. After the system exits POR,

the data in the EEPROM is loaded into the

MP2886A Datasheet(PDF) 21 Page - Monolithic Power Systems

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