MCP6034 MICROCHIP [Microchip Technology], MCP6034 Datasheet - Page 17

• Manufacturer Part Number: MCP6034
• Description: 0.9 uA, High Precision Op Amps
• Manufacturer: MICROCHIP [Microchip Technology]

4.9
4.9.1
The MCP6031/2/3/4 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 ultra low quiescent
current (0.9 µA, typical) helps prolong battery life, and
the rail-to-rail output supports detection of low currents.
Figure 4-7
circuit. The 10Ω resistor is sized to minimize power
losses. The battery current (I
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 V
within its allowed range. The output of the op amp will
also be below V
Voltage Swing specification.
FIGURE 4-7:
Sensor.
© 2007 Microchip Technology Inc.
1.8V to
5.5V
10Ω
V
Application Circuits
DD
shows a high side battery current sensor
BATTERY CURRENT SENSING
V
SS
I
I
DD
DD
DD
100 kΩ
, which is within its Maximum Output
=
------------------------------------------- -
(
High Side Battery Current
10 V V
V
DD
⁄
–
)
V
•
DD
MCP6031
OUT
(
10
) through the 10Ω
1 MΩ
V
Ω
DD
)
V
SS
DD
, which is
V
OUT
4.9.2
Use high gain before a comparator to improve the lat-
ter’s input offset performance.
of 11 V/V placed before a comparator. The reference
voltage V
rails.
FIGURE 4-8:
Comparator.
V
IN
100 kΩ
REF
MCP6031
PRECISION COMPARATOR
can be any value between the supply
MCP6031/2/3/4
1 MΩ
V
REF
Precision, Non-inverting
MCP6541
Figure 4-8
DS22041A-page 17
shows a gain
V
OUT