LB1982ALQFP32

The LB1982 integrates a precision analogue front-end controller and a switching-mode power supply (SMPS), as well as a pulse-width modulation (PWM) driver, within a single silicon platform for large-capacity battery testing and manufacturing. A precision instrumentation amplifier (in-amp) measures the battery charge/discharge current with an accuracy of better than ±0.1%, while a similarly precise differential amplifier measures the battery voltage. An internal laser-trimmed resistor network sets the gain of the instrumentation amplifier and differential amplifier (66V/V and 0.4V/V, respectively) and stabilizes the LB1982's performance over the specified operating temperature range. By applying precise control voltages to the ISET and VSET inputs, the required battery cycle current and voltage levels are established. The actual charge and discharge current levels are sensed (usually through high-power, high-precision shunt resistors), the values of which are carefully chosen based on system parameters. The switching between constant current (CC) and constant voltage (CV) loops is instantaneous, automatic, and transparent to the observer. A logical high level on the MODE input determines the charge or discharge mode (high level indicates charge, low level indicates discharge). With a space-saving 7mm × 7mm × 1.4mm, 32-pin, LQFP package, the LB1982 simplifies design and provides exceptional performance, functionality, and overall reliability, with an operating temperature range of -40°C to +85°C.