MP8796B datasheet(32/52 Pages) MPS

32 / 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.

OPERATION (01h)

OPERATION is a paged register. The OPERATION command turns the converter output on or off in

conjunction with the input from the CTRL pin. OPERATION also sets the output voltage to the upper or

lower margin voltages. The unit remains in the commanded operating mode until a subsequent

OPERATION command or a change in the state of the CTRL pin instructs the converter to change to

another mode. This OPERATION command re-enables the converter after a fault-triggered shutdown.

Writing an off command followed by an on command clears all faults. Writing only an on command after

a fault-triggered shutdown will not clear the fault registers.

Command

OPERATION

Format

Unsigned binary

Bit

Access

R/W

Function

Default Value

Bit[7:6]

Bit[5:4]

Bit[3:2]

Bit[1:0]

On/Off

Margin state

01h

Immediate off

N/A

0x00

Soft off

N/A

0x40

Off

0x80

Margin low (ignore fault)

0x94

Margin low (act on fault)

0x98

Margin high (ignore fault)

0xA4

Margin high (act on fault)

0xA8

ON_OFF_CONFIG (02h)

The ON_OFF_CONFIG command configures the combination of the CTRL input and the PMBus

commands to turn the converter on and off. This includes how the converter responds when an input

voltage is applied.

Command

ON_OFF_CONFIG

Format

Unsigned binary

Bit

Access

R/W

Function

Ctrl

Pol_Ctrl

Delay

Default Value

The on bit sets the device to either operate whenever the input voltage is present, or for the on/off

function to be controlled by the CTRL and PMBus commands.

Bit[4] Value

Meaning

Converter powers up when the input voltage is present, regardless of state the of the CTRL pin.

Converter does not power up until commanded by the CTRL pin and OPERATION command (as

programmed in bit[3:0]).

The op bit controls how the converter responds to the OPERATION commands.

Bit[3] Value

Meaning

Converter ignores the “on” bit in the OPERATION command from the PMBus.

Converter responds to the “on” bit in the OPERATION command from the PMBus.

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