The LTC4110 is a complete single chip, high efficiency, flyback battery charge and discharge manager with automatic switchover between the input supply and the backup battery or super capacitor. The IC provides four modes of operation: battery backup, battery charge, battery calibration, and shutdown. Battery backup and battery charge are automatic standalone modes, while the optional calibration mode requires a CPU host to communicate over an SMBus. During calibration, the flyback charger is used in reverse to discharge the battery with a programmable constant current into the system load eliminating heat generation. Three status outputs can be individually reconfigured over the SMBus to become GPIOs. User programmable over-discharge protection is provided. The SHDN pin isolates the battery to support shipping the product with a charged battery installed. Multiple LTC4110s can be combined to form a redundant battery backup system or increase the number of battery packs to achieve longer backup run times. The LTC4110 is available in a low profile (0.75mm), 38-pin 5mm × 7mm QFN package. The QFN features an exposed metal die mount pad for optimum thermal performance.
The LTC4110 is a complete single‑chip backup battery manager supporting Li‑ion/Polymer, Lead‑acid, NiMH/NiCd batteries and super‑capacitors. It provides charge, discharge, calibration and automatic switchover between the input supply and the backup source, with optional SMBus/I²C control for host‑based calibration.
The document includes absolute maximum ratings, pin configuration, detailed electrical characteristics, package information for the 38‑lead QFN, typical performance curves, and example applications such as server memory backup and medical equipment power protection.
| Backup Battery Supply Range | 2.7 V to 19 V |
|---|---|
| Package Type | 38‑Lead (5mm × 7mm) Plastic QFN |
| Programmable Charge/Calibration Current | Up to 3 A |
The backup battery supply range is 2.7 V to 19 V.