EE Product News

Multi-Cell, Multi-Chemistry Charger Controllers Need No Blocking Diode

A family of fast-charge, 4-A, high-efficiency battery charger controllers target multiple battery chemistries. The LTC4012 supports Li-ion/Polymer, NiMH, NiCd, and sealed lead-acid batteries in single- and multi-cell configurations, and offers adjustable battery-termination voltage. The LTC4012-1 and LTC4012-3 use a programmable internal resistor divider to charge from one to four series Lithium cells at multiples of 4.1 and 4.2 V, respectively. All devices feature a wide output voltage range of 2 to 28 V. The controllers' analog INFET control eliminates the need for an external blocking diode at the power input, which increases efficiency and reduces the solution footprint. Also, ac adapter current limiting maximizes the charge rate for a given fixed input power level, allowing the end-product to operate at the same time the battery is charging without complex load management algorithms. The ICs operate at input voltages from 5 to 28 V and are intended for applications including portable computers, portable instruments, and battery backup systems. The LTC4012/-1/-2 come in a compact 20-lead, low-profile (0.75-mm) 4- by 4-mm QFN package. They are guaranteed for operation from 0°C to 85°C ambient temperature. Pricing starts at $3.15 for the LTC4012 and $3.25 each for the LTC4012-1 and LTC4012-3 each, in 1000-piece quantities. LINEAR TECHNOLOGY CORP., Milpitas, CA. (408) 432-1900.


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