TCM680 datasheet(7/18 Pages) MICROCHIP

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DS21486C-page 7

TCM680

4.5

Maximum Operating Limits

The maximum input voltage rating must be observed.

The TCM680 will clamp the input voltage to 5.8V.

Exceeding this maximum threshold will cause exces-

sive current to flow through the TCM680, potentially

causing permanent damage to the device.

4.6

Switched Capacitor Converter

Power Losses

The overall power loss of a switched capacitor

converter is affected by four factors:

Losses from power consumed by the internal

oscillator, switch drive, etc. These losses will

vary

with

input

voltage,

temperature and

oscillator frequency.

Conduction losses in the non-ideal switches.

Losses due to the non-ideal nature of the

external capacitors.

Losses that occur during charge transfer from

the pump to reservoir capacitors when a voltage

difference between the capacitors exists.

The power loss for the TCM680 is calculated using the

following equation:

EQUATION

PLOSS = (IOUT+)

2 X R

OUT

- + (I

OUT-)

2 X R

OUT

+ + I

IN X VIN

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