A New, High Efficiency, Monolithic Synchronous Step-Down Regulator Works with Single or Dual Li-Ion Batteries

摘要

Li-Ion batteries, with their high energy density, are becoming the chemistry of choice for designers of many handheld products. In response to this growing trend, the LTC~®1627 incorporates features optimized for such chemistry. For instance, the LTC1627 integrates a precision undervoltage lockout circuit that shuts itself down when the supply voltage dips below 2.5V, drawing only 6μA of quiescent current. This prevents damaging a Li-Ion battery when it is nearing its end of charge. The operating supply range of the LTC1627 is from 2.65V to 8.5V; this accommodates one ortwo Li-Ion batteries and 3-to 6-cell NiCd and NiMH battery packs.