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CBC3150-D9C-TR5 датащи(PDF) 2 Page - Cymbet Corporation

номер детали CBC3150-D9C-TR5
подробное описание детали  Capacitance to EnerChip Battery Charge Conversion Guide
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производитель  CYMBET [Cymbet Corporation]
домашняя страница  http://www.cymbet.com
Logo CYMBET - Cymbet Corporation

CBC3150-D9C-TR5 датащи(HTML) 2 Page - Cymbet Corporation

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AN-1057: Capacitance to EnerChip Battery Charge Conversion Guide
©2013 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com
Doc AN-72-1057 Rev B
Page 2 of 3
Preliminary
Figure 1 profiles do not account for the effects of self-discharge, which are measurably worse for
supercapacitors than for the EnerChip solid state battery.
Another frequently asked question is: “How much storage capacity do I need for my application?”
The simplest calculation involves multiplying the RTC/MCU/SRAM operating current (at the backup power
source voltage) times the number of hours needed for backup. The product is the amount of charge capacity
needed, in ampere-hours. When calculating the device run time in backup mode, it is sometimes necessary
to include de-rating factors such as storage device characteristics vs. temperature and aging, as well as load
current consumption over temperature and voltage. This is particularly true if precise knowledge of minimum
available backup time over life of product is required.
Comparing - in absolute terms - EnerChip storage capacity to supercapacitors in a comparable energy storage
range, we turn to Figure 2. Recalling the state-of-charge dependence typical of supercapacitors, three lines are
drawn, representing the minimum operating voltage (Vmin) at which the load can operate. Note that as Vmin
rises, a diminishing amount of useful charge is available from the supercapacitor. (Again, the relatively high
self-discharge of supercapacitors has been ignored here for the sake of clarity.) For reference, EnerChips range
from a few microampere-hours to several tens of microampere-hours, corresponding to equivalent capacitance
of tens to hundreds of millifarads.
Figure 2: Charge Capacity of EnerChips vs. Supercapacitors at Several Discharge Cutoff Voltage Levels.
In addition to the battery (EnerChip) management functions, the EnerChip CC has additional functions that
are useful and often necessary in backup power applications - such as supply voltage threshold detection and
a power-good indicator. EnerChip CC devices also have temperature-dependent battery charge compensation
included to improve the service life of the product. For more technical information related to the EnerChip and
EnerChip CC products, refer to the Cymbet Corporation web site: www.cymbet.com.


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