Rainbow Electronics BA3170 User Manual

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.

Applications
Lithium-ion (two cell) battery chargers, and charging circuits

Features

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.

5) Built-in over-discharge battery return circuit.

6) Built-in charge fault protection circuit.

7) Built-in over-voltage battery operation circuit.

8) Built-in LED output for charge display (two outputs).

9) 12-pin power package provides large power dissipa­tion in a compact package.

10) Temperature protection circuit prevents thermal de­struction of the IC.

Absolute maximum ratings (Ta = 25C)

Recommended operating conditions (Ta = 25C)

395

Regulator ICs BA3170

Block diagram

396

Regulator ICs BA3170

Pin descriptions

Electrical characteristics (unless otherwise noted, Ta = 25C, V

CC = 12V, R1 = 58.7kΩ, R2 = 10kΩ)

397