Datasheet LTC4110 (Analog Devices) - 10

LTC4110
PIN FUNCTIONS BAT (Pin 31):
Battery Voltage Sense Input. This pin is used
BATID (Pin 35):
Drives the Gate of the Battery P-MOSFET to monitor the battery and control charging voltage through Ideal Diode. Controls low loss ideal diode between the an internal resistor divider connected to this pin that is battery and backup load when in backup mode. When not disconnected in shutdown mode. Also provides a control in backup mode, the P-MOSFET is turned off to prevent input for battery ideal diode functions. Pin should be Kelvin- battery power from back driving into main power. connected to battery to avoid voltage drop errors.
NC (Pin 36):
No Connect.
DCHFET (Pin 32):
Drives the Gate of an External N-MOSFET.
DCOUT (Pin 37):
System Power Output Voltage Monitor Used to drive energy into the battery side of the high ef- Input. Provides a control input for supply input ideal diode fi ciency switch mode converter during low loss calibration and battery ideal diode functions. Also supplies power to the discharge of the battery. Provides synchronous rectifi cation IC. Bypass at pin with 100nF low ESR capacitor to GND. during battery charging.
INID (Pin 38):
Drives the Gate of the Supply Input P-MOSFET
CHGFET (Pin 33):
Drives the Gate of an External N- Ideal Diode. Controls low loss ideal diode between the sup- MOSFET. Used to drive energy into the supply side of ply input and backup load when not in backup mode. the high effi ciency switch mode converter during battery charging. Provides synchronous rectifi cation during low
Exposed Pad (Pin 39):
Ground. The Exposed Pad must loss calibration mode. be soldered to the PCB.
VDD (Pin 34):
Bypass Capacitor Connection for Internal VDD Regulator. Bypass at pin with 100nF low ESR capaci- tor to GND. 4110fb 10