MCPF1412M06 datasheet(13/63 Pages) MICROCHIP

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MCPF1412M06

Functional Description

Data Sheet

DS60001885C - 13

The MCPF1412M06 issues warnings for output overvoltage and undervoltage, and provides

protection against output undervoltage faults. These functions are controlled by three commands

(or their corresponding user registers):

• VOUT_OV_WARN_LIMIT

• VOUT_UV_WARN_LIMIT

• VOUT_UV_FAULT_LIMIT

The threshold mechanism for these warnings differs from the overvoltage protection mechanism:

the warnings use a digital comparison of the digitized and processed VOUT telemetry against the

thresholds, while the overvoltage protection uses an all-analog signal path and an internal high-

speed comparator.

2.12. Overtemperature Protection (OTP)

The MCPF1412M06 includes an internal temperature sensing feature. The Overtemperature

Protection (OTP) threshold is determined by a fixed internal threshold, set at 145°C. This threshold is

monitored by an internal analog comparison. If the temperature exceeds this limit, the device halts

switching and turns OFF all MOSFETs until the temperature falls below the threshold, at which point

it automatically restarts.

2.13. Power Good (PG)

Power Good (PG) behavior is defined through the PGControl register bits and the

POWER_GOOD_ON command. When the PGControl bit is enabled, the PMBus™ command can

set the upper Power Good threshold relative to the output voltage with a resolution of 1/256V.

Internally, these values are rounded to one of four settings, as illustrated in the table below.

POWER_GOOD_ON

(% of VOUT_COMMAND)

Actual Threshold

(% of VOUT_COMMAND)

Above 96.1 or below 79.6

Above 79.6 to 85.1

Above 85.1 to 89.8

90 (default)

Above 89.8 to 96.1

The default setting is 90%, meaning the PG signal will be activated when the voltage at the FB pin

surpasses 90% of the VOUT_COMMAND setting (default 0.6V). A 5% hysteresis is applied, creating a

lower threshold. If the voltage at the FB pin falls below this lower threshold, the PG signal will be

deactivated.

Figure 2-8 illustrates the case where the PGControl bit is set to 1.

Figure 2-8. PG Operation With PGControl Bit Set to 1

85% VOUT

90% VOUT

VOUT

The behavior remains consistent during start-up and normal operation. The PG signal is asserted

when:

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