PT8A2707 Datasheet, PDF (2/26 Pages) Pericom Semiconductor Corporation – Charger Controller with Fuel-Guage & LCD/LED Display

PT8A2707-12/17-19
Charger Controller
with Fuel-Guage & LCD/LED Display
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Description
The PT8A2707-12/2717-19 integrates charger controller and fuel-gauge into a single-chip. It detects full-charge
through -V, dT/dt, safety-timer and maximum battery voltage, and learns the battery capacity from each
charging/discharging cycle. Since PT8A2707-12/2717-19 measures charge/discharge current to account for the battery
capacity in/out respectively, the battery capacity can be accurately recorded and displayed in 6-level
(10%/20%/40%/60%/80%/100%) LED or LCD pattern. The continuous-learning capability enables the devices to take
care of battery aging effect so that the capacity level is always accurately displayed throughout the life-span of the
battery pack. In the charging control, a DC/DC controller is regulated to regulate constant currents for pre-charge, fast-
charge and trickle-charge conditions. The charging current is determined by the value of a current-sense resistor such
that it is tunable upon different applications requirements. When motor is turned on during charging, the charge
current to battery pack is regulated at 1/10 of the fast-charge current so that motor can draw current from the adapter
while battery is charged in a safe and under-controlled condition. The PT8A2707-12/2717-19 employs NTC as the
means to measure the battery pack temperature. When a high temperature is measured during charging, the charging
current will be cut off. The devices also detect NTC short/open at which all activities will be disabled if any one of
these conditions is observed.
Function comparison table
Family
members
TACT
Switch
(ON/OFF)
SLIDE
Switch
(ON/OFF)
DSTACT Switch
(ON(70%)/100%
/OFF)
LCD
PT8A2707
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PT8A2708
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PT8A2709
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PT8A2710
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PT8A2711
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PT8A2712
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PT8A2717
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PT8A2718
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PT8A2719
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LED



Motor
Speed (70%
PWM)

LCD/LED
display in
idle mode

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


12-07-0005
PT0268-1 07/05/12
2