MCP6144-I/SL Microchip Technology, MCP6144-I/SL Datasheet - Page 15

• Manufacturer Part Number: MCP6144-I/SL
• Description: IC OPAMP 1.4V QUAD R-R 14-SOIC
• Manufacturer: Microchip Technology

Specifications of MCP6144-I/SL

• Slew Rate: 0.003 V/µs
• Operating Temperature: -40°C ~ 85°C
• Amplifier Type: General Purpose
• Number Of Circuits: 4
• Output Type: Rail-to-Rail
• Gain Bandwidth Product: 100kHz
• Current - Input Bias: 1pA
• Voltage - Input Offset: 3000µV
• Current - Supply: 0.6µA
• Current - Output / Channel: 20mA
• Voltage - Supply, Single/dual (±): 1.4 V ~ 6 V
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Op Amp Type: General Purpose
• No. Of Amplifiers: 4
• Bandwidth: 100kHz
• Supply Voltage Range: 1.4V To 5.5V
• Amplifier Case Style: SOIC
• No. Of Pins: 14
• Number Of Channels: 4
• Voltage Gain Db: 115 dB
• Common Mode Rejection Ratio (min): 60 dB
• Input Offset Voltage: 3 mV
• Operating Supply Voltage: 3 V, 5 V
• Supply Current: 0.004 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: Details

4.9
4.9.1
The MCP6141/2/3/4 op amps’ Common Mode Input
Range, which goes 0.3V beyond both supply rails, sup-
ports their use in high side and low side battery current
sensing applications. The very low quiescent current
(0.6 A, typ.) help prolong battery life, and the
rail-to-rail output supports detection low currents.
Figure 4-9 shows a high side battery current sensor
circuit. The 1 k
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 at V
within its allowed range. When no current is flowing, the
output will be at its Maximum Output Voltage Swing
(V
FIGURE 4-9:
Sensor.
© 2005 Microchip Technology Inc.
.
1.4V to
OH
5.5V
1 k
), which is virtually at V
Application Circuits
BATTERY CURRENT SENSING
V
V
SS
DD
I
DD
100 k
resistor is sized to minimize power
High Side Battery Current
DD
.
DD
MCP6141
) through the 1 k
1 M
V
V
DD
SS
DD
, which is
V
OUT
4.9.2
The MCP6141/2/3/4 op amp is well suited for the
inverting summing amplifier shown in Figure 4-10
when the resistors at the input (R
the noise gain at least 10 V/V. The output voltage
(V
and is shifted by the V
calculations follow in Equation 4-3.
FIGURE 4-10:
EQUATION 4-3:
.
OUT
Noise Gain:
Signal Gains:
Output Signal:
) is a weighted sum of the inputs (V
V
V
V
1
2
3
G
G
G
G
V
V
OUT
N
1
2
3
INVERTING SUMMING AMPLIFIER
REF
=
=
=
=
R
R
R
MCP6141/2/3/4
1
2
3
–
–
–
=
1
R
R
R
+
F
F
F
V
1
R
G
R
R
R
F
Summing Amplifier.
1
2
3
1
⎛
⎝
MCP614X
----- -
R
+
1
1
V
REF
+
2
R
G
----- -
R
F
1
2
2
input. The necessary
+
+
V
1
----- -
R
, R
1
3
3
G
DS21668B-page 15
⎞
⎠
2
3
, and R
+
10 V/V
1
V
, V
V
REF
2
OUT
, and V
3
G
) make
N
3
),