The LTC4000 is a high voltage, high current battery charging controller and power manager that forms a powerful battery charging and power management solution when combined with any externally compensated DC/DC converter, that is one with an ITH or VC pin. Virtually any topology switcher is compatible, including but not limited to buck, boost, buck-boost, SEPIC, and flyback. The LTC4000’s full-featured controller charges a variety of battery chemistries over a wide voltage range including lithium-ion/polymer/phosphate, sealed lead acid (SLA), and nickel-based. The LTC4000 is housed in a low profile 28-pin 4mm x 5mm QFN package and a 28-lead SSOP package.