UCM101L-AF5-R datasheet(4/4 Pages) UTC

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UCM101

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

4 of 4

www.unisonic.com.tw

QW-R502-933.a



APPLICATION INFORMATION

A common application for micro-power current monitors is measuring the discharge current of a rechargeable

lithium ion/polymer battery. The UTC UCM101 enables measuring both the charge and discharge current into the

battery and with its wide operating voltage of 2.5~20V enables it to measure the currents in to/ out of up to 4 cells

connected in series.

When choosing appropriate values for RSENSE a compromise must be reached between in-line signal loss

(including potential power dissipation effects) and small signal accuracy.

Higher values for RSENSE gives better accuracy at low load currents by reducing the inaccuracies due to internal

offsets. For best operation the UTC UCM101 has been designed to operate with VSENSE of the order of

50mV~150mV.

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TYPICAL APPLICATION CIRCUIT

VIN+

VIN-

S+

S-

Flag

GND

OUT

VOUT

UTC

UCM101

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.

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