MCPF1412M06 datasheet(7/63 Pages) MICROCHIP

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MCPF1412M06

Functional Description

Data Sheet

DS60001885C - 7

• +9 – 7.15 kΩ

• +10 – 7.87 kΩ

• +11 – 8.66 kΩ

• +12 – 9.31 kΩ

• +13 – 10.2 kΩ

• +14 – 11 kΩ

• +15 – 12.1 kΩ

Note: Avoid using the 7-bit address 0x0C, as it corresponds to the Alert Response Address in the

SMBus™ protocol.

2.5.

Soft Start and Target Output Voltage

The MCPF1412M06 features an internal digital soft start circuit designed to manage the output

voltage rise-time and limit current surges during start-up. When VCC surpasses its start threshold

(VCC_UVLO(START)), the MCPF1412M06 exits reset mode, initiating the loading of non-volatile memory

contents into working registers and calculating the address offset as previously described. After

initialization, the internal soft start ramps up towards the set reference voltage at a rate specified by

the TON_RISE registers (associated with the TON_RISE command), provided the following conditions

are met:

1. A valid enable signal is detected, as defined by the Enable pin, Operation register,

ON_OFF_CONFIG register, input voltage PVIN, and PVIN UVLO threshold corresponding to the

VIN_ON registers.

2. The internal pre-charge circuit ensures balanced PVIN/2 voltages across all FETs when the device

begins switching.

During initial start-up, the MCPF1412M06 operates with minimal high-drive (HDrv) pulses until

the output voltage increases (refer to Switching frequency and minimum values for ON-time, OFF-

time). The ON time is increased until VOUT reaches the target value set by the VOUT_COMMAND

registers. For optimal start-up performance, it is recommended to use a 100Ω resistor connected

in parallel with the output capacitors (COUT). A minimum wait time of 600Ω × COUT is advised

between successive power or Enable cycling operations. For instance, with a 100Ω resistor across

four 47 μF output capacitors, a new Enable assertion should not occur until at least 78 ms (allowing

the reduction of capacitance at a bias of 1V - see Design Example) after disabling the MCPF1412M06.

MCPF1412M06 Datasheet(PDF) 7 Page - Microchip Technology