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12-07-0005

PT0268-1

07/05/12

2

PT8A2707-12/17-19

Charger Controller

with Fuel-Guage & LCD/LED Display

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

LED

Motor

Speed (70%

PWM)

LCD/LED

display in

idle mode

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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