The LTC ®1759 Smart Battery Charger is a single chip charging solution that dramatically simplifies construc- tion of an SBS compliant system. The LTC1759 imple- ments a Level 2 charger function whereby the charger can be programmed by the battery or by the host. A thermistor on the battery being charged is monitored for tempera- ture, connectivity and battery type information. The SMBus interface remains alive when the AC power adapter is removed and responds to all SMBus activity directed to it, including thermistor status (via the ChargerStatus com- mand). The charger also provides an interrupt to the host whenever a status change is detected (e.g., battery removal, AC adapter connection). Charging current and voltage are restricted to chemistry specific limits for improved system safety and reliability. Limits are programmable by two external resistors. Addi- tionally, the maximum average current from the AC adapter is programmable to avoid overloading the adapter when simultaneously supplying load current and charging cur- rent. When supplying system load current, charging cur- rent is automatically reduced to prevent adapter overload.
The LTC1759 is a single‑chip smart battery charger controller that supports SMBus communication, host‑or‑battery programming, and high‑efficiency synchronous buck conversion. It offers up to 8 A charging current, 0.5 V dropout, and a maximum duty cycle greater than 99.5 %.
The document details absolute maximum ratings, electrical characteristics, pin descriptions, typical performance curves, and example application circuits, including charging indication and high‑speed switching paths.
| Maximum Duty Cycle | > 99.5% |
|---|---|
| Charging Current Capability | Up to 8 A |
| Voltage Accuracy | 1 % |
| Current Accuracy | 5 % |
| Package | 36‑lead narrow (0.209") SSOP |
| Dropout Voltage | 0.5 V |
The LTC1759 can provide up to 8 A of charging current.
It is supplied in a 36‑lead narrow (0.209 in) SSOP package.
Status changes are signaled via the INTB (Interrupt Bar) active‑low output, which can be connected to the SMBALERT# line of the SMBus.
The charger has a dropout voltage of 0.5 V.