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Charger Controller with Fuel-Guage & LCD/LED Display

12-07-0005

PT0268-1

07/05/12

1

PT8A2707-12/17-19

Product Features

 2-3 cells, NiCd or NiMH battery fast-charger controller for battery-embedded devices

 Precise 7-bit fuel-gauge-counter measures charging and discharging current through battery pack. Make it possible

to accurately indicate battery capacity through LCD (PT8A2707-09/2717-19) or LEDs (PT8A2710-12).

PCB module that can:

 Cover different product models that requires different charging current/speed by changing only one resistor;

 Work with different kinds of AC/DC adapters with wide input voltage ranges.

charging current to battery is regulated at a maximum value of 1/10 of the fast-charging current. The

battery is just like being slowly-charged and prevented from being exposed to a prolonged high-current

charging profile.

 Available with different parts to cover products employing slide switch (PT8A2707/10/17), tact switch

(PT8A2708/09/11/12/18/19) input to control motor ON/OFF. Two-step motor-speed control (70%, 100%) is also

available in PT8A2708/2711/2718.

 Very low standby current of typical 20A. Products could typically work in standby-mode for a few months,

depends on battery capacity.

Technology Highlights

 Employing 5 major charging states: cool-down / pre-charge / fast charge / trickle charge / stop charge, taking the

best care for different battery conditions, especially for aged or dry batteries

 Excellent battery protection and full-charge detection schemes

 Maximum battery voltage detection to turn to maintenance

 Rate of change of temperature detection (dT/dt) best for NiMH batteries full-charge termination (use with

NTC)

 Abnormal high battery temperature (55C) detection to stop charging (use with NTC)

 Flexible fast charge time-out setting (30mins/60mins/90mins/150mins)

 Fuel-gauge counter takes into account the battery self-discharge compensation based on time.

 Provide excellent battery over-discharge protection through auto-stop motor at once (<0.2s) when

 discharging current is higher than preset limit value for 3sec (3 limit values selectable externally)

 battery pack voltage is lower than No-Power value (adjustable externally)

 NTC measures battery pack temperature higher than preset high-temp value(adjustable externally)

 Key delay to reject multiple inputs at Tact switch (about 0.125s ignorance).

 Internal voltage regulator provides better rejection to interference.

 Integrated DC/DC step-down controller to regulate constant charging currents at different charging

 Available with 24-pin SOIC and SSOP lead-free package