UB261

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

10 of 10

www.unisonic.com.tw

QW-R502-A27.b



TYPICAL APPLICATION CIRCUIT

M1

M2

R1=100~470Ω

C1=0.1µF

R2=1kΩ

DO

CO

Battery

EB+

EB-

UTC UB261

DP

Notes: 1. Overdischarge detection voltage must be higher than the threshold voltage of M1 and M2, if not, the M1

may not cut the charging current. If the threshold voltage of M1 equal to or higher than the overdischarge

detection voltage is used, discharging may be stopped before overdischarge is detected.

2. Charger voltage must be higher than the withstanding voltage between the gate and source of M1 and M2,

if not, M1 and M2 may be destroyed.

3. Resistance of R1 can’t be high, the value is about from 100Ω to 470Ω, If R1 has a high resistance, the

connected in reverse since the current flows from the charger to the IC. Insert a resistor of 100Ω or higher

as R1 for ESD protection.

4. The capacitance of C1 must not be less than 0.022μF, if not, DO pin may oscillate when load

short-circuiting is detected. Be sure to connect a capacitor of 0.022μF or higher to C1, the typical value is

about 0.1μF.

5. The resistance of R2 can not be higher than 2kΩ, if not, the charging current may not be cut when a

high-voltage charger is connected.

UTC assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or

other parameters) listed in products specifications of any and all UTC products described or contained

herein. UTC products are not designed for use in life support appliances, devices or systems where

malfunction of these products can be reasonably expected to result in personal injury. Reproduction in

whole or in part is prohibited without the prior written consent of the copyright owner. The information

presented in this document does not form part of any quotation or contract, is believed to be accurate

and reliable and may be changed without notice.