LTC4110EUHF LINER [Linear Technology], LTC4110EUHF Datasheet - Page 9

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

ACPb (Pin 13): AC Present Status Digital Output. Open-
Drain N-MOSFET output is asserted low when the main
supply is present as detected by the DCDIV pin and internal
DCIN UVLO.
V
Backup Program Input. Battery threshold voltage at which
backup mode will terminate by turning off the isolation
P-MOSFET with the BATID pin. Adjustable from external
resistor string biased from V
connect to GND pin.
V
tion Program Input. Battery threshold voltage at which
calibration will terminate. Adjustable from external resistor
string biased from V
to GND pin.
V
the fl oat voltage during charging. Programmed from
external resistor string biased from V
GND for default fl oat voltage.
V
gramming Input. Provides a typical virtual reference of 1.220V
(V
GND that programs the V
Total resistance from V
on the timer pin, programs the charge time. Voltage refer-
ence output remains active in all modes except shutdown.
Load current must be between 10μA and 25μA.
TIMER (Pin 18): Charge Timing Input. A capacitor con-
nected between TIMER and GND along with the resistance
connected from V
intervals.
TYPE (Pin 19): Refer to Table 8.
THA (Pin 20): SafetySignal Force/Sense Pin to Smart
Battery and Force Pin to Lead Acid Battery Thermistor.
See description of operation for more detail. The maxi-
mum allowed combined capacitance on THA, THB and
SafetySignal is 1nF . For lead acid battery applications the
maximum capacitance on the THA pin is 50pF .
PIN FUNCTIONS
REF
DIS
CAL
CHG
REF
(Pin 17): Voltage Reference Output and Timing Pro-
) for an external resistor divider tied between this pin and
(Pin 14): Battery Discharge Voltage Limit During
(Pin 16): Battery Float Voltage Program Input. Trims
(Pin 15): Battery Voltage Limit During Calibra-
REF
REF
REF
to GND programs the charge time
pin. For default threshold connect
CHG
to GND, along with the capacitor
, V
REF
CAL
pin. For default threshold
and V
REF
DIS
pin. Connect to
pin functions.
THB (Pin 21): SafetySignal Force/Sense Pin to Smart
Battery and Sense Pin to Lead Acid Battery Thermistor.
See description of operation for more detail. The maxi-
mum allowed combined capacitance on THA, THB and
SafetySignal is 1nF .
I
Program Input. Programs the battery current during
preconditioning or wakeup charging. Programmed from
external resistor to GND.
I
Program Input. Programs the constant discharge current at
the battery during calibration. Programmed from external
resistor to GND.
I
Programs the battery current while constant-current bulk
charging. Programmed from external resistor to GND.
I
compensates control loop. Higher I
to higher charging current.
CSP (Pin 26): Current Sense Positive Input. This pin and
the CSN pin measure voltage across the external current
sense resistor to control battery current during charging
and calibration.
CSN (Pin 27): Current Sense Negative Input. This pin and
the CSP pin measure voltage across the external current
sense resistor to control battery current during charging
and calibration.
SGND (Pin 28): Signal Ground Reference Input. This pin
should be Kelvin connected to the fl yback current sense
resistor and to the battery return.
I
the fl yback transformer by monitoring voltage across the
external current sense resistor. This pin should be Kelvin-
connected to the resistor.
SELC (Pin 30): Refer to Table 8.
PCC
CAL
CHG
TH
SENSE
(Pin 25): Control Signal of the Current Mode PWM. AC
(Pin 23): Battery Discharge Current During Calibration
(Pin 24): Battery Current During Charge Program Input.
(Pin 22): Battery Preconditioning Charge Current
(Pin 29): Current Sense Input. Senses current in
TH
voltage corresponds
LTC4110
4110fa
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