MP86992

– 50A INTELLI-PHASETM SOLUTION IN LGA (5MMX6MM)

MP86992 Rev. 1.0

www.MonolithicPower.com

10

11/5/2019

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When any fault occurs, TOUT/FLT is pulled to

the VDD voltage to report the fault event

regardless of the temperature. 200ns after the

fault occurs, the PWM impedance changes

accordingly to indicate the fault type. Table 2

shows the PWM status regarding each fault

event.

Table 2: PWM Resistance when a Fault Occurs

Fault Type

PWM

HS-FET current limit protection

10k

Ω to AGND

Over-temperature protection

20k

Ω to AGND

SW-PGND short protection

1k

Ω to VDD

TOUT/FLT can monitor three fault events:

1.

Over-current limit (HS-FET)

– To trip the

over-current fault, the current limit must be

exceeded eight consecutive times. Once a

fault occurs, the MP86992 latches off to turn

off the HS-FET. The LS-FET turns off when

the inductor current reaches zero. PWM

uses a 10kΩ resistor to AGND to indicate the

fault type.

2.

Over-temperature fault at TJ > 160°C – Once

a fault occurs, the MP86992 latches off to

turn off the HS-FET. The LS-FET turns off

when the inductor current reaches zero.

PWM uses a 20kΩ resistor to AGND to

indicate the fault type.

3.

SW to PGND shorted

– Once a fault occurs,

the MP86992 latches off to turn off the HS-

FET. PWM is pulled high (1kΩ to VDD) to

indicate the fault type.

The fault latch can be released by toggling EN,

or by recycling VIN or VDD.

For

multi-phase

operation,

connect

the

TOUT/FLT pin of each Intelli-PhaseTM together

(see Figure 3).

L1

PWM

PWM1

L2

PWM

VIN

PWM2

TOUT/FLT

TOUT/FLT

Intelli-Phase

TM

VOUT

COUT

Multi-Phase

Controller

Temperature

ADC

Intelli-Phase

TM

Power Stage

VIN

VIN

VIN

Intelli-Phase

TM

Figure 3: Multi-Phase Temperature Sense Utilization