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UB2012
(Rev.:2010)

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

Unisonic Technologies 

UB2012

Preliminary

„ APPLICATION INFORMATION(Cont.)

LINEAR INTEGRATED CIRCUIT

CURRENT REGULATION PHASE

When the battery-pack voltage is less than the regulation voltage, VO(REG), the current is regulated by the UTC

UB2012. This advanced linear charge management IC monitors charge current at the SNS input by the voltage drop

across a sense-resistor, RSNS, in series with the battery pack. In current sensing configuration (Figure 5), RSNS is

between the VCC and SNS pins. Charge-current feedback, applied through pin SNS, maintains a voltage of VSNS

across the current sense resistor. The following formula calculates the value of the sense resistor:

R SNS

=

V(SNS)

IO(REG)

(1)

Where IO(REG) is the desired charging current.

UNISONIC TECHNOLOGIES CO., LTD

www.unisonic.com.tw

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QW-R121-018 .b

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