MCPF1412M06 datasheet(11/63 Pages) MICROCHIP

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MCPF1412M06

Functional Description

Data Sheet

DS60001885C - 11

2.9.

Enable Pin (EN)

The Enable (EN) pin serves multiple purposes:

• By default, according to the ON_OFF_CONFIG command, it controls the power state of the

MCPF1412M06. It features a precise threshold monitored by the UVLO circuit. If left unconnected,

an internal 1 MΩ resistor pulls it down to prevent accidental activation of the MCPF1412M06.

• It can be utilized to establish a precise input voltage UVLO. The EN pin's input is derived from the

PVIN voltage through a set of resistive dividers (Figure 2-1). Users can adjust the UVLO threshold

voltage by selecting different resistor ratios, allowing for finer control over the PVIN UVLO voltage

levels than the VIN_ON/VIN_OFF commands provide.

• It can also be used to monitor other power rails for specific power sequencing schemes (Figure

2-5).

Figure 2-5. EN Pin Used to Monitor a Second Rail for Startup

MCPF1412

RAIL #2

PVIN

VIN

PVCC

VCC

PVIN

2.10. Overcurrent Protection (OCP)

Overcurrent Protection (OCP) is achieved by monitoring the voltage across the channel RDS(ON) of

the Synchronous MOSFET. When this surpasses the OCP threshold, a fault condition is triggered.

This approach offers several advantages:

• Ensures precise overcurrent protection without compromising converter efficiency (the current

sensing is lossless)

• Lowers costs by eliminating the need for a current-sense resistor

• Minimizes layout-related noise issues

The OCP threshold is set by the IOUT_OC_FAULT_LIMIT command (or corresponding user registers)

and can be programmed in 0.5A increments, up to a maximum of 16A. The recommended minimum

overcurrent threshold is 10A. The OCP threshold is internally compensated to remain nearly

constant across different ambient temperatures.

When the current exceeds the OCP threshold, the PG and SS signals are pulled low. The

Synchronous MOSFET stays ON until the current drops to 0, after which the MCPF1412M06 enters

hiccup. Both the Control MOSFET and the Synchronous MOSFET remain OFF during the hiccup-

blanking period. After this period, the MCPF1412M06 attempts to restart. If an overcurrent fault

is still present, the previous actions are repeated. The MCPF1412M06 stays in hiccup mode until

the overcurrent fault is resolved. The MCPF1412M06 can also be reprogrammed to enter a latched

shutdown mode upon detecting an overcurrent fault.

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