MP8796B datasheet(33/52 Pages) MPS

33 / 52 page

MP8796B – 16V, 30A, SYNCHRONOUS STEP-DOWN CONVERTER WITH PMBUS

MP8796B Rev. 1.0

www.MonolithicPower.com

1/19/2020

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

Ctrl

The ctrl bit controls how the converter responds to the CTRL pin.

Bit[2] Value

Meaning

Converter ignores the CTRL pin (on/off function is controlled by the OPERATION command).

Converter requires the CTRL pin to be asserted to power up. Depending on the bit[3] op bit, the

OPERATION command may also be required to instruct the converter to power up.

Pol_ctrl

The pol_ctrl bit sets the polarity of the CTRL pin.

Bit[1] Value

Meaning

Active low (pull the CTRL pin low to start the converter).

Active high (pull the CTRL pin high to start the converter).

Delay

The delay bit sets the turn-off action when the converter is commanded to turn off through the PMBus.

This bit is read-only and cannot be modified by the end user.

Bit[0] Value

Meaning

TOFF_DELAY, TOFF_FALL

CLEAR_FAULTS (03h)

The CLEAR_FAULTS command resets all stored warning and fault flags. If a fault or warning condition

still remains when the CLEAR_FAULTS command is issued, the ALT# signal may not be cleared or is

reasserted almost immediately. Issuing a CLEAR_FAULTS command will not cause the converter to

restart in the event of a fault shutdown. The converter restart must be done by issuing an OPERATION

command after the fault condition is cleared. This command uses the PMBus to send the byte protocol.

WRITE_PROTECT (10h)

The WRITE_PROTECT command controls writes to the converter. This command provides protection

against accidental changes. This command is not intended to provide protection against deliberate

changes to the converter’s configuration or operation.

All the supported commands may have their parameters read, regardless of the WRITE_PROTECT

settings.

Bit[7:0] Value

Meaning

Enable writes to all commands.

Disable all writes except to the WRITE_PROTECT, OPERATION, PAGE, ON_OFF_

CONFIG, and VOUT_COMMAND commands.

Disable all writes except to the WRITE_PROTECT, OPERATION, and PAGE

commands.

Disable all writes except to the WRITE_PROTECT command.

When 10h is set to a value other than 0x00, in order to program the MTP, 15h must be programmed

through the MPS GUI. A separate MTP command on E7h cannot be used. See the Multi-Time

Programming (MTP) section on page 30 for details on MTP programming.

The default value of 10h is 0x00.

STORE_USER_ALL (15h)

This command writes all data from the registers to the internal MTPs. This process operates when the

MP8796B receives a STORE_USER_ALL command from the PMBus interface. Currently, the

MP8796B does not support a standard 15h command, but it can accept a 15h command from MPS’s

GUI software for the MP8796B. See the Multi-Time Programming (MTP) section on page 30 for details.

MP8796B Datasheet(PDF) 33 Page - Monolithic Power Systems

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