MCP6044T-ESLASHST datasheet(15/40 Pages) MICROCHIP

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DS21669D-page 15

MCP6041/2/3/4

4.9

Application Circuits

4.9.1

BATTERY CURRENT SENSING

The MCP6041/2/3/4 op amps’ Common Mode Input

Range, which goes 0.3V beyond both supply rails,

supports their use in high-side and low-side battery

current sensing applications. The very low quiescent

current (0.6 µA, typical) helps prolong battery life, and

the rail-to-rail output supports detection low currents.

Figure 4-7 shows a high-side battery current sensor

circuit. The 10

 resistor is sized to minimize power

losses. The battery current (IDD) through the 10

resistor causes its top terminal to be more negative

than the bottom terminal. This keeps the Common

mode input voltage of the op amp below VDD, which is

within its allowed range. The output of the op amp will

also be below VDD, which is within its Maximum Output

Voltage Swing specification.

FIGURE 4-7:

High-Side Battery Current

Sensor.

4.9.2

INSTRUMENTATION AMPLIFIER

The MCP6041/2/3/4 op amp is well suited for

conditioning

sensor

signals

battery-powered

applications. Figure 4-8 shows a two op amp instru-

mentation amplifier, using the MCP6042, that works

well for applications requiring rejection of Common

mode noise at higher gains. The reference voltage

(VREF) is supplied by a low impedance source. In single

supply applications, VREF is typically VDD/2.

FIGURE 4-8:

Two Op Amp

Instrumentation Amplifier.

VDD

IDD

MCP604X

100 k



1.4V

VOUT



6.0V

OUT

–

10 V/V

 10







------------------------------------------

OUT

–

 1

------

---------





REF

VREF R1

VOUT

MCP6042

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