MP86998

– INTEGRATED INTELLI-PHASETM SOLUTION IN TLGA PACKAGE

MP86998 Rev. 1.0

www.MonolithicPower.com

11

11/3/2020

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The gain is 8mV/°C and has an 800mV offset at

25°C. For example the voltage is 0.8V when

TJ = 25°C, and 1.6V when TJ = 125°C.

If a fault occurs, TOUT/FLT is pulled to the VDD

voltage to report the fault event, regardless of the

temperature. 200ns after the fault occurrs, 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-to-PGND short protection

1k

Ω to VDD

TOUT/FLT can monitor three fault events.

1.

Over-current limit (HS-FET): To trigger an

over-current fault, the current limit must be

exceeded eight consecutive times. If this

fault occurs, the MP86998 latches off to turn

off the HS-FET. The LS-FET turns on and

stays on until the inductor current reaches

0A. PWM uses a

10kΩ resistor connected to

AGND to indicate the fault type.

2.

Over-temperature fault at TJ > 160°C: If this

fault occurs, the MP86998 latches off to turn

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

the inductor current reaches 0A. PWM uses

a

20kΩ resistor connected to AGND to

indicate the fault type.

3.

SW-to-PGND short: If this fault occurs, the

MP86998 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 power on VIN or VDD.

For

multi-phase

operation,

connect

the

TOUT/FLT pins of each Intelli-PhaseTM together

(see Figure 2).

L1

PWM

Intelli-Phase

TM

PWM1

L2

PWM

VIN

VIN

PWM2

TOUT/FLT

VIN

TOUT/FLT

Intelli-Phase

TM

VOUT

COUT

Multi-Phase

Controller

Temperature

ADC

Intelli-Phase

TM

Power Stage

VIN

Figure 2: Multi-Phase Temperature-Sense Utilization