LMC6584AIM datasheet(16/19 Pages) NSC

Part #	LMC6584AIM

Description	Low Voltage, Rail-To-Rail Input and Output CMOS Operational Amplifier

PDF	19 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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16 / 19 page

Battery Monitoring Circuit (Continued)

The LMC6582/4 has been optimized for performance at 3V,

and also has guaranteed specs at 1.8V and 2.2V. In portable

applications, the R

Load represents the laptop/notebook, or

any other computer which the battery is powering. A desired

output voltage can be achieved by manipulating the ratios of

the feedback resistors. During the charging cycle, the cur-

rent flows out of the battery as shown. While during dis-

charge, the current is in the reverse direction. Since the cur-

rent can range from a few milliamperes to amperes, the

amplifier will have to sense a signal below ground during the

discharge cycle. At 3V, the LMC6582/4 can accept a signal

up to 300 mV below ground. The common-mode voltage

range of the LMC6582/4, which extends beyond both rails is

thus a very useful feature in this application.

A typical offset voltage of 0.5 mV, and CMRR of 82 dB main-

tain accuracy in the circuit outputs while the rail-to-rail output

performance allows for a maximum signal range.

DS012041-34

FIGURE 24. Circuit used to Sense Discharging

LMC6584AIM Datasheet(PDF) 16 Page - National Semiconductor (TI)