UB2012 データシートの表示（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.)

DC+

RSNS

0.2Ω

Q1

UT4101

D1

VCC

R2

UTC

1kΩ

CC

UB2012

COMP

SNS

BAT

VCC

TS

VSS

STAT

GND

C1

10μF

R4

511Ω

R5

1kΩ

R3

1kΩ

PACK+

C2

10μF

PACK-

VCC

RT1

TEMP

RT2

NTC

Battery

Pack

CMD67-

22SRU

Fig. 4 0.5-A Charger Using P-Channel MOSFET

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 (Fig. 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

9 of 17

QW-R121-018 .G

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