MAX1758EAI

The MAX1758EAI is a versatile, stand-alone, switch-mode lithium-ion battery charger IC from Analog Devices. It is capable of charging one to four Li+ battery cells, providing a regulated charging current accurate to ±10% and a regulated voltage with only a ±0.8% total voltage error at the battery terminals. The internal high-side switch delivers a programmable current of up to 1.5A.

This charger features a built-in safety timer that automatically terminates charging once an adjustable time limit is reached. An additional control loop monitors the total current drawn from the input source, automatically reducing battery-charging current to prevent overload of the input supply. This allows for the use of low-cost wall adapters. The per-cell battery regulation voltage can be set between 4.0V and 4.4V using standard 1% resistors, and the number of cells is set from 1-to-4 by pin strapping.

Battery temperature is monitored by an external thermistor to prevent charging outside the acceptable temperature range. The MAX1758EAI operates within a temperature range of -40°C to 85°C (TA) and is available in a space-saving 28-pin SSOP package suitable for surface mounting.

Applications include Li+ battery packs for notebook computers, hand-held instruments, and desktop cradle chargers.