Datasheet

LMV981-N, LMV982-N
www.ti.com SNOS976L –NOVEMBER 2001–REVISED MARCH 2013
Figure 31. Canceling the Offset Voltage due to Input Bias Current
Typical Applications
High Side Current Sensing
The high side current sensing circuit (Figure 32) is commonly used in a battery charger to monitor charging
current to prevent over charging. A sense resistor R
SENSE
is connected to the battery directly. This system
requires an op amp with rail-to-rail input. The LMV981-N/LMV982 are ideal for this application because the
common mode input range goes up to the rail.
Figure 32. High Side Current Sensing
Half-Wave Rectifier with Rail-to-Ground Output Swing
Since the LMV981-N/LMV982 input common mode range includes both positive and negative supply rails and
the output can also swing to either supply, achieving half-wave rectifier functions in either direction is an easy
task. All that is needed are two external resistors; there is no need for diodes or matched resistors. The half
wave rectifier can have either positive or negative going outputs, depending on the way the circuit is arranged.
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