MAX77542 datasheet(52/122 Pages) AD

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NORMAL

NORMAL(1)

(1)

POK FAULT

POK FAULT(2)

(2)

(Mx_POK = 0)

SCP FAULT

SCP FAULT(3)

(3)

(Mx_POK = 0, Mx_SCFLT = 1)

LX THREE-STATE IMMEDIATELY,

VOUT REGISTERS OF BUCKS

ARE RESET

tELAPSED < tPOK_TO

VOUTx ≥ 82% of TARGET

VOUTx < 20% OF TARGET

OR tELAPSED ≥ tPOK_TO

VIO ≤ VIO_UVLO_F

VOUTx ≤ 78% OF TARGET

88))

1) EACH BUCK HAS AN INDEPENDENT

FAULT STATE.

2) IN POK FAULT STATE, THE

INDIVIDUAL BUCK OUTPUT CAN

STILL BE ENABLED OR DISABLED.

3) SHORT-CIRCUIT FAULT EVENT

DISABLES ONLY BUCK IN FAULT

CONDITION AND RESETS VOUT

REGISTERS OF CORRESPONDING

BUCK.

4) UVLO FAULT EVENT DISABLES ALL

BUCKS AND RESETS VOUT

REGISTERS OF ALL BUCKS.

5) VIO FAULT EVENT DISABLES ALL

BUCKS AND RESETS VOUT

REGISTERS OF ALL BUCKS.

6) OVER-TEMPERATURE FAULT

EVENT DISABLES ALL BUCKS AND

RESETS VOUT REGISTERS OF ALL

BUCKS.

7) AFTER 500ms OF FORCED DISABLE

TIME, BUCK FAULT STATE IS

AUTOMATICALLY CLEARED WHEN

JUNCTION TEMPERATURE COOLS

DOWN TO +140°C, IF THE

AUTO_RSTRT BIT IS SET TO 1.

8) ALL BUCK OUTPUTS MUST BE

DISABLED TO CLEAR TSHDN

FAULT, HOWEVER SCP FAULT IS

CLEARED WHEN THE

CORRESPONDING BUCK OUTPUT

IS DISABLED.

9) TRANSITION IS PREVENTED

DURING SOFT-START AND SOFT-

STOP.

10)

10) IF VSYS DROPS BELOW POR

THRESHOLD (TYP 1.7V) OR VDD

SUPPLY IS NOT VALID (< 1.55V,

TYP), ALL FAULT STATE IS

CLEARED.

WAIT

WAIT(7)

(7)

FORCED DISABLED FOR 500ms

TSHDN FAULT

TSHDN FAULT(6)

(6)

(TSHDN = 1)

LX THREE-STATE IMMEDIATELY,

VOUT REGISTERS OF ALL BUCKS

ARE RESET

VVIO

IO FAULT

FAULT(5)

(5)

(VIOFLT = 1)

LX THREE-STATE IMMEDIATELY,

VOUT REGISTERS OF ALL BUCKS

ARE RESET

TJ ≥ +165°C

TJ < +150°C AND

AND Mx_EN =

EN_Mx = FPS_Mx = 0

VIO > VIO_UVLO_R

AUTO_RSTRT = 0

LATCH OFF

LATCH OFF(8)

(8)

TJ < +150°C AND

AND

AUTO_RSTRT = 1

ANY STATE

UVLO FAULT

UVLO FAULT(4)

(4)

(UVLO = 1)

LX THREE-STATE IMMEDIATELY,

VOUT REGISTERS OF ALL BUCKS

ARE RESET

VSYS > VUVLO_R

VSYS ≤ VUVLO_F

Figure 12. Fault-Protection State Diagram

Detailed Description—Multifunction I/Os

The MAX77542 has eight multifunction I/Os (MFIO1 through MFIO8) which can be configured as output enable, low-

power mode, forced-PWM mode, external clock detection, clock output, output-voltage selection, POK output, FPS input,

FPS output, system reset input, system reset output, thermal-warning output, GPIO, and ADC mux input. The default

functions of the MFIOs are selected by the RCFG1 (see the Device Configuration (CFGx) section for more information)

and they are individually selectable through the I2C interface. The I/O supply voltage (VIO) must be valid for the MFIOx

to operate in the GPO function with push-pull mode. Each MFIO has a set of interrupt, interrupt mask, and status bits.

When unmasked, the interrupt bit sets whenever activated input state toggles.

MAX77542

16VIN/16A, Quad-Phase High-Efficiency Buck

Converter

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