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LTC4110

4110fa

based on the desired cap voltage and series cell count.

Other per cell voltages can be obtained by adjusting the

VCHG pin as required.

When the LTC4110 is conﬁgured to charge a super cap,

if TYPE pin is tied to 0.5VREF, use the bulk charge current

equation (see the Programming Charging/Calibration Cur-

rent section for details) to set the charging current. If TYPE

pin is tied to GND, then the charging current will equal

to preconditioning charge current when the cap voltage

is below the bulk charge threshold (as listed in Table 9)

and bulk charge current when the voltage is above the

threshold. Simply tie the IPCC pin to ICHG pin if these two

currents need to be the same. If the capacitor is too small

(<10mF), the voltage might rise too fast to be regulated

by the loop. In that case, the capacitor will be charged to

over voltage pretection threshold (typically 107.5% of the

ﬂoat voltage. See VBOV)

The ﬁrst conﬁguration option to set for the LTC4110 is the

type and cell count of the battery you wish to use. Pins

TYPE and SELC are use to set this conﬁguration. Please

note NiMH and NiCd batteries are only supported in the

smart battery conﬁguration. The three state input pins

SELA, SELC and TYPE should NOT be changed while power

is applied to the IC unless in shutdown mode. Such action

will result in unpredictable behavior from the LTC4110.

SUPERCAPS

Table 8 shows all of the options with the exception of

SuperCaps. SuperCaps are supported by using standard

Li-ion or SLA modes in combination with the adjusting the

charge voltage with the VCHG pin. As far as the LTC4110

is concerned, it is still working with a Li-ion or SLA bat-

tery and will follow all the charge states as required for

that chemistry. Table 9 shows the required conﬁguration

APPLICATIONS INFORMATION

Table 8. Battery Type and Number of Series Cell Selection for Batteries

STANDARD Li-Ion

(TYPE = GND)

SLA

(TYPE = 0.5VREF)

SMART NiMH/NiCd

(TYPE = VREF)

SMART Li-Ion

(TYPE = VDD)

SELC = GND

1241

SELC = 0.5VREF

2362

SELC = VREF

3593

SELC = VDD

Note: When smart battery is selected by the TYPE pin, SELA pin must be connected to GND to select address 12h.

Table 9. Battery Type and Number of Series Cell Selection for Super Caps

CAP VOLTAGE (V)

SERIES CAP

COUNT

STACK CAP

VOLTAGE (V)

TYPE

SELC

VCHG

BULK CHARGE

THRESHOLD (V/CELL)

2.5

0.5VREF

GND

0.625VREF

N/A

2.5

7.5

0.5VREF

0.625VREF

N/A

2.5

12.5

0.5VREF

VREF

0.625VREF

N/A

2.5

0.5VREF

VDD

0.625VREF

N/A

2.5

17.5

GND

VDD

0.646VREF

1.71

2.7

8.1

GND

0.5VREF

0.375VREF

2.7

13.5

GND

VREF

0.750VREF

1.8

2.7

16.2

GND

VDD

0.375VREF

GND

0.5VREF

0.750VREF

GND

VREF

0.333VREF

2.25

0.5VREF

VDD

0.625VREF

N/A

GND

VDD

0.750VREF

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