PT8A2707 Datasheet, PDF (1/26 Pages) Pericom Semiconductor Corporation – Charger Controller with Fuel-Guage & LCD/LED Display

PT8A2707-12/17-19
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Charger Controller with Fuel-Guage & LCD/LED Display
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).
 Integrated with a DC/DC step-down controller make it possible for customers to manufacture just one
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.
 Motor also can work in both corded or cordless conditions. When motor is used in cord-mode, the
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.
 Provide excellent charge and discharge protections.
 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
 Negative delta voltage detection (-ΔV) with precision of +/-1mV step
 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
12-07-0005
PT0268-1 07/05/12
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