MPM54313 datasheet(16/49 Pages) MPS

16 / 49 page

MPM54313

– 16V, TRIPLE 3A POWER MODULE WITH I2C

MPM54313 Rev. 1.0

MonolithicPower.com

5/7/2024

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

Over-Current Protection (OCP) and Short-

Circuit Protection (SCP)

The MPM54313 has fixed 3.6A valley current

limit control. When the low-side MOSFET (LS-

FET) is turning on, the inductor current (IL) is

monitored. If the sensed IL exceeds the valley

current limit threshold, the device sends an over-

current

(OC)

fault

warning

via

OC_STATUS_CLEAR

(2Ah).

The

high-side

MOSFET (HS-FET) is not allowed to turn on until

the valley current drops below the OC threshold.

Meanwhile, VOUT drops until it falls below its UV

threshold.

If the UV and OC conditions are both triggered,

OCP latches the device off. This means that the

chip disables the output power stage. The

MPM54313 does not automatically turn on again

until the UV and OCP conditions are removed,

and power is cycled on EN.

Output Discharge

To discharge the output capacitor

’s energy

during the power-off sequence or shutdown

sequence, there is discharge path from the VOx

pin to ground. The discharge function can be

enabled via the MTP interface, as well as the

discharge resistor.

Soft Start and Soft Stop

The MPM54313 employs a soft-start and soft-

stop mechanism to ensure smooth output during

the power-on and power-off sequences.

When the part is enabled and the BST voltage

reaches its rising threshold, the internal digital-

to-analog converter (DAC) outputs a ramp

voltage (reference voltage). VOUT smoothly

ramps up with the reference voltage. When the

DAC output reaches the final voltage, it stops at

that level. At this point, soft start finishes and the

device enters steady state operation.

When the part is disabled, the internal DAC

ramps down the reference voltage. The output

voltage follows the soft-stop slew rate with the

reference voltage until the output drops to 0.15V.

Then soft stop is finished, and the output is

discharged by a 30

Ω discharge resistor.

The start-up delay, shutdown delay, and soft-

start and soft-stop time can be configured via the

MTP.

Interleaving for Buck A and Buck B

The MPM54313 supports 2-phase interleaving

mode for buck A and buck B by setting

PROTECT_REG (14h), bit[5] = 1. VSA+ should

be connected to VSB+ for interleaving work

mode.

Figure 4 shows how the internal SET signal is

triggered when buck A/

B’s FB signal is below the

internal REF signal. When the SET signal

becomes high, only one phase’s pulse-width

modulation (PWM) output becomes high; the

next time SET becomes high, the next phase

’s

PWM output becomes high. This process

achieves automatic interleaving.

When buck A and buck B work in dual-phase

interleaving operation mode, the MPM54313

senses two phase currents and automatically

tunes the

buck’s on time (tON) to achieve active

paralleled current balancing.

VFB

VREF

SET

SWA

SWB

Figure 4: Dual-Phase Interleaving Mode

Active Voltage Positioning (AVP)

The

MPM54313

supports

active

voltage

positioning (AVP) by setting the AVP_EN bits

(ACTIVE_POSITION_ENABLE_A/B (71h), bit[7]

and

ACTIVE_POSITION_ENABLE_C

(79h),

bit[7]) to 1 via the I2C. Once enabled, the output

voltage of the corresponding channel drops in

proportion with the load current. VDROOP and VOUT

can be calculated with Equation (1) and Equation

(2), respectively:

VDROOP = IOUT x RDROOP

(1)

VOUT = VREF - VDROOP

(2)

Where VDROOP is the droop voltage, RDROOP is the

droop resistance with a typical value of 40m

Ω,

and VREF is the reference voltage of each

channel.

The AVP function enables on-demand parallel

operation, where the three outputs can be

paralleled in any combination without pre-setting

any registers (see Figure 5 on page 17). The

current of the paralleled channel(s) is inherently

balanced by the droop voltage created by the

AVP function.

MPM54313 Datasheet(PDF) 16 Page - Monolithic Power Systems

MPM54313 Datasheet(HTML) 16 Page - Monolithic Power Systems

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49

Datasheet Download

Link URL