SM6780AS

SM6780AS NIPPON PRECISION CIRCUITS INC. Ni-Cd/Ni-MH Battery Charger IC OVERVIEW The SM6780AS is a quick charge control IC for Nickel-Cadmium (Ni-Cd) and Nickel Metal Hydride (Ni-MH) rechargeable batteries. It supports quick charge, supplemental and pulse trickle charging modes. The charging mode is selected automatically in response to the battery voltage, temperature and charging time. The quick charge uses either negative delta voltage detection (−∆V), temperature detection (∆T/∆t), or charging time cutoff to control the charging process. In addition, the quick charge mode can be placed on hold, if the battery voltage or battery temperature are abnormal, until normal conditions are restored. The SM6780AS requires few external components to realize a high-stability quick charge battery charger. FEATURES s s s PINOUT (Top view) s s s s s s s s Ni-Cd/Ni-MH battery quick charge control −∆V, ∆T/∆t, and maximum charge time cutoffs 3 charge modes (quick charge, supplemental, pulse trickle charge) 3 selectable charge times (80, 120, and 240 minutes) Charge condition LED indicator output (on, pulsed, off) Low power dissipation mode 4.0 to 5.5V operating supply voltage 300sec (typ) −∆V detection invalid time 8mV (typ) −∆V detection accuracy 25mV/min (typ) ∆T/∆t detection accuracy 8-pin SOP package TIME CHGN 6780AS LEDN BATT VSS INH VDD TEMP ORDERING INFORMATION Device SM6780AS Package 8-pin SOP PACKAGE DIMENSIONS (Unit: mm) 0.15 + 0.1 − 0.05 4.4 0.2 6.2 0.3 0.695t...