LTC4110EUHF データシートの表示（PDF） - Linear Technology

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LTC4110EUHF

Battery Backup System Manager

Linear Technology 

LTC4110

PIN FUNCTIONS

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.

VDIS (Pin 14): Battery Discharge Voltage Limit During

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 VREF pin. For default threshold

connect to GND pin.

VCAL (Pin 15): Battery Voltage Limit During Calibra-

tion Program Input. Battery threshold voltage at which

calibration will terminate. Adjustable from external resistor

string biased from VREF pin. For default threshold connect

to GND pin.

VCHG (Pin 16): Battery Float Voltage Program Input. Trims

the float voltage during charging. Programmed from

external resistor string biased from VREF pin. Connect to

GND for default float voltage.

VREF (Pin 17): Voltage Reference Output and Timing Pro-

gramming Input. Provides a typical virtual reference of 1.220V

(VREF) for an external resistor divider tied between this pin and

GND that programs the VCHG, VCAL and VDIS pin functions.

Total resistance from VREF to GND, along with the capacitor

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 VREF to GND programs the charge time

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.

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.

IPCC (Pin 22): Battery Preconditioning Charge Current

Program Input. Programs the battery current during

preconditioning or wakeup charging. Programmed from

external resistor to GND.

ICAL (Pin 23): Battery Discharge Current During Calibration

Program Input. Programs the constant discharge current at

the battery during calibration. Programmed from external

resistor to GND.

ICHG (Pin 24): Battery Current During Charge Program Input.

Programs the battery current while constant-current bulk

charging. Programmed from external resistor to GND.

ITH (Pin 25): Control Signal of the Current Mode PWM. AC

compensates control loop. Higher ITH voltage corresponds

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 flyback current sense

resistor and to the battery return.

ISENSE (Pin 29): Current Sense Input. Senses current in

the flyback 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.

4110fa

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