MP86936

– INTELLI-PHASETM WITH INTEGRATED DRIVER AND MOSFETS

MP86936 Rev. 1.1

www.MonolithicPower.com

10

8/4/2023

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© 2023 MPS. All Rights Reserved.

Temperature-Sense

Output

with

Fault

Indicator (VTEMP/FLT)

VTEMP/FLT is a pin with dual functions:

1. Junction temperature sense: VTEMP/FLT is

a voltage output proportional to the junction

temperature (TJ) whenever VDD is above its

under-voltage lockout (UVLO) threshold and

the part is in active mode. The gain is

10mV/°C, with a 150mV offset at 25°C. For

example, the gain is 0V at TJ < 10°C, 0.15V

at TJ = 25°C, and 0.9V at TJ = 100°C.

2. Fault indication: If any fault occurs, the

VTEMP/FLT pin is pulled to VDD (regardless

of the temperature) to report the fault event.

If the fault lasts for longer than 200ns, the

PWM impedance changes accordingly to

represent the fault type. Table 2 shows the

PWM status regarding each fault event.

Table 2: PWM Resistance when a Fault Occurs

Fault Type

PWM

Current-limit protection

10k

Ω to AGND

Over-temperature protection

(OTP)

20k

Ω to AGND

SW-PGND short protection

1k

Ω to VDD

The VTEMP/FLT pin monitors for three different

fault events:

1.

Over-current (OC) limit: If the current limit is

exceeded for four consecutive PWM cycles,

this fault is triggered. Once the fault is

triggered, the MP86936 latches off to turn off

the HS-FET. The LS-FET turns off once IL

reaches zero. When this fault occurs, PWM

changes to a

10kΩ to AGND register

configuration to indicate the fault type.

2.

Over-temperature protection (OTP): If TJ

exceeds 160°C, this fault is triggered. Once

the fault is triggered, the MP86936 latches

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

off once IL reaches zero. When this fault

occurs, PWM changes to a

20kΩ to AGND

register configuration to indicate the fault

type.

3.

SW to PGND short: Once the fault is

triggered, the MP86936 latches off to turn off

the HS-FET. When this fault occurs, PWM is

pulled high (

1kΩ to VDD) to indicate the fault

type.

The fault latch cannot be reset by entering

standby mode. Recycle the power on VIN or

VDD to release of fault latch.

For

multi-phase

operation,

connect

the

VTEMP/FLT

pins

of

each

Intelli-PhaseTM

together (see Figure 2).

L1

PWM

Intelli-Phase

TM

PWM1

L2

PWM

VIN

VIN

PWM2

VTEMP

VIN

VIN

VTEMP

VOUT

COUT

Multi-Phase

Controller

Temperature

ADC

Intelli-Phase

TM

Power Stage

Intelli-Phase

TM

Figure 2: Multi-Phase Temperature-Sense Utilization