Linear Technology Corporation introduces the LTC4011, a complete NiMH/NiCd battery charger device without any microcontroller or firmware programming required. The LTC4011 includes charge initiation, monitoring, protection, charge termination and constant current control circuitry for an autonomous charger product. The IC can fast charge 1- to 16-cell NiMH or NiCd batteries at rates up to 4 A from a range of input supplies and wall adapter voltages from 4.5 to 34 V. Both Δ V and ΔT/Δt charge termination can be active simultaneously in addition to a programmable safety timer. A step-down constant current controller using synchronous rectification allows high current charging with desirable efficiency from input voltages up to 34 V. With the LTC4011's 550 kHz operating frequency, the battery charger allows the use of small sized inductors and capacitors thus minimizing printed circuit board area. The LTC4011CFE is suited for use in portable instruments, diagnostic and control systems as well as back-up equipment.
Linear Technology Corporation