LTC4110EUHF LINER [Linear Technology], LTC4110EUHF Datasheet - Page 33

• Manufacturer Part Number: LTC4110EUHF
• Description: Battery Backup System Manager
• Manufacturer: LINER [Linear Technology]

APPLICATIONS INFORMATION
The fi rst confi guration 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 confi guration. Please
note NiMH and NiCd batteries are only supported in the
smart battery confi guration. 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 V
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 confi guration
Table 8. Battery Type and Number of Series Cell Selection for Batteries
SELC = GND
SELC = 0.5V
SELC = V
SELC = V
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)
2.5
2.5
2.5
2.5
2.5
2.7
2.7
2.7
REF
DD
3
3
3
3
REF
SERIES CAP
COUNT
2
3
5
6
7
3
5
6
3
4
5
6
CHG
STANDARD Li-Ion
(TYPE = GND)
pin. As far as the LTC4110
1
2
3
4
VOLTAGE (V)
STACK CAP
12.5
17.5
13.5
16.2
7.5
8.1
15
12
15
18
5
9
(TYPE = 0.5V
0.5V
0.5V
0.5V
0.5V
0.5V
TYPE
GND
GND
GND
GND
GND
GND
GND
SLA
REF
REF
REF
REF
REF
2
3
5
6
based on the desired cap voltage and series cell count.
Other per cell voltages can be obtained by adjusting the
V
When the LTC4110 is confi gured to charge a super cap,
if TYPE pin is tied to 0.5V
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 I
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
fl oat voltage. See V
CHG
REF
)
pin as required.
0.5V
0.5V
0.5V
SELC
GND
V
V
V
V
V
V
V
V
REF
REF
REF
DD
DD
DD
DD
DD
REF
REF
REF
SMART NiMH/NiCd
(TYPE = V
BOV
10
4
6
9
)
REF
REF
PCC
0.625V
0.625V
0.625V
0.625V
0.646V
0.375V
0.750V
0.375V
0.750V
0.333V
0.625V
0.750V
)
, use the bulk charge current
V
CHG
pin to I
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
CHG
THRESHOLD (V/CELL)
LTC4110
SMART Li-Ion
(TYPE = V
pin if these two
BULK CHARGE
1
2
3
4
1.71
2.25
N/A
N/A
N/A
N/A
N/A
1.8
2
2
2
2
DD
33
)
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