UB264BG-P08-R datasheet(9/10 Pages) UTC

9 / 10 page

UB264B

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

9 of 10

www.unisonic.com.tw

QW-R502-833.A

TYPICAL APPLICATION CIRCUIT(Cont.)

2-serial cell

BAT1

BAT2

RVDD

CVDD

VDD

SENSE

VC1

VC2

VC3

VSS

CTL

UTC

UB264B

Series

External

input

RCTL

EB+

EB-

FET

SC Protector

Constants for External Components

NO.

PART

MIN

TYP

MAX

UNIT

R1 to R4

0.1

KΩ

C1 to C4, CVDD

0.01

0.1

μF

RVDD

100

500

Ω

RCTL

100

500

Ω

Notes:

the examples of connection shown above and the constants will not guarantee successful operation.

Perform thorough evaluation using the actual application to set the constant.

Set the same constants to R1 to R4 and to C1 to C4 and CVDD.

Set RVDD, C1 to C4 and CVDD so that the condition (RVDD) × (C1 to C4, CVDD) ≥ 5 × 10

−6 is satisfied.

T Set R1 to R4, C1 to C4, and CVDD so that the condition (R1 to R4) × (C1 to C4, CVDD) ≥ 1 × 10

−4 is

satisfied.

In some application circuits, even if an overcharged battery is not included, the order of connecting

batteries may be restricted to prevent transient output of CO detection pulses when the batteries are

connected. Perform thorough evaluation with the actual application circuit.

Since “H” may be output at CO transiently when the battery is being connected, connect the positive

terminal of BAT1 last in order to prevent the three terminal protection fuse from cutoff.

Before the battery connection, short-circuit the battery side pins RVDD and R1.

In the UTC UB264B Series, normally input “L” to the external input, and input “H” when releasing the

latch that maintains CO at “H” after overcharge detection.

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