UB2012CL-S08-R datasheet(9/17 Pages) UTC

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UB2012

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

9 of 17

www.unisonic.com.tw

QW-R121-018 .G



APPLICATION INFORMATION(Cont.)

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

DC+

10μF

RSNS

0.2Ω

1kΩ

UTC

UB2012

SNS

VCC

VSS

STAT

BAT

COMP

511Ω

1kΩ

RT2

TEMP

PACK-

10μF

PACK+

NTC

Battery

Pack

CMD67-

22SRU

UT4101

VCC

RT1

GND

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:

O(REG)

(SNS)

SNS



(1)

Where IO(REG) is the desired charging current.

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