BA3170

Regulator ICs Trickle-charge IC for two-cell, lithium-ion batteries BA3170 The BA3170 is a trickle-charge IC developed for two-cell, lithium-ion batteries.The IC includes a charge control circuit, a charge output transistor, and an LED driver for showing the charging status. FApplications Lithium-ion (two cell) battery chargers, and charging circuits FFeatures 1) Output voltage can be varied using an external resistor. 2) The output pin is PNP output with low saturation voltage. 3) Built-in output current limiting circuit protects batteries from excessive current, and prevents destruction of the IC due to output shorts. The initial charge current is set to a low value (the current limit pin voltage can be used to vary the current limit value). 4) Pulse charging at over 99% of the final voltage. FAbsolute maximum ratings (Ta = 25_C) 5) 6) 7) 8) 9) Built-in over-discharge battery return circuit. Built-in charge fault protection circuit. Built-in over-voltage battery operation circuit. Built-in LED output for charge display (two outputs). 12-pin power package provides large power dissipation in a compact package. 10) Temperature protection circuit prevents thermal destruction of the IC. FRecommended operating conditions (Ta = 25_C) 395 Regulator ICs FBlock diagram BA3170 396 Regulator ICs FPin descriptions BA3170 FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 12V, R1 = 58.7kΩ, R2 = 10kΩ) 397 Regulator ICs BA3170 FOperation notes (1) Do not u...