UB2012 Просмотр технического описания (PDF) - Unisonic Technologies

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UB2012

ADVANCED LINEAR CHARGE MANAGEMENT IC FOR SINGLE AND TWO-CELL LITHIUM-ION AND LITHIUM-POLYMER

Unisonic Technologies 

UB2012

LINEAR INTEGRATED CIRCUIT

 APPLICATION INFORMATION(Cont.)

VOLTAGE REGULATION PHASE

The voltage regulation feedback is through the BAT pin. This input is tied directly to the positive side of the

battery pack. The UTC UB2012 monitors the battery-pack voltage between the BAT and VSS pins. According to the

voltage regulation, there are four versions of UTC UB2012, namely, 4.1V, 4.2V, 8.2V and 8.4V.

Other regulation voltages can be achieved by adding a voltage divider between the positive and negative

terminals of the battery pack and using UTC UB2012C or UTC UB2012D. The voltage divider presents scaled

battery-pack voltage to BAT input. (See Fig. 7, 8) The resistor values RB1 and RB2 for the voltage divider are

calculated by the following equation:

RB1

RB2

= (N×

V(CELL)

VO(REG)

)

-

1

(2)

Where: N = Number of cells in series, V(CELL) = Desired regulation voltage per cell

CHARGE TERMINATION AND RECHARGE

The UTC UB2012 monitors the charging current during the voltage-regulation phase. The UTC UB2012

declares a done condition and terminates charge when the current tapers off to the charge termination threshold,

I(TERM). A new charge cycle begins when the battery voltage falls below the V(RCH) threshold.

UNISONIC TECHNOLOGIES CO., LTD

www.unisonic.com.tw

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