LMV931MF/NOPB National Semiconductor, LMV931MF/NOPB Datasheet - Page 14

• Manufacturer Part Number: LMV931MF/NOPB
• Description: IC OP AMP RRIO SNGL 1.8V SOT23-5
• Manufacturer: National Semiconductor

Specifications of LMV931MF/NOPB

• Amplifier Type: General Purpose
• Number Of Circuits: 1
• Output Type: Rail-to-Rail
• Slew Rate: 0.42 V/µs
• Gain Bandwidth Product: 1.5MHz
• Current - Input Bias: 14nA
• Voltage - Input Offset: 1000µV
• Current - Supply: 116µA
• Current - Output / Channel: 100mA
• Voltage - Supply, Single/dual (±): 1.8 V ~ 5.5 V, ±0.9 V ~ 2.75 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-5, SC-74A, SOT-25
• Number Of Channels: 1
• Voltage Gain Db: 113 dB
• Common Mode Rejection Ratio (min): 50 dB
• Input Offset Voltage: 4 mV at 5 V
• Operating Supply Voltage: 3 V
• Supply Current: 0.21 mA at 5 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• For Use With: LMH730227 - BOARD EVALUATION FOR SOIC PKGLMH730165 - BOARD EVALUATIONLMH730216 - BOARD EVAL HS MONO AMP SOT23
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: Details
• Other names: LMV931MF; LMV931MFTR

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FIGURE 1. Canceling the Offset Voltage due to Input Bias
Typical Applications
HIGH SIDE CURRENT SENSING
The high side current sensing circuit
used in a battery charger to monitor charging current to pre-
vent over charging. A sense resistor R
the battery directly. This system requires an op amp with rail-
to-rail input. The LMV931/LMV932/LMV934 are ideal for this
application because its common mode input range goes up
to the rail.
FIGURE 2. High Side Current Sensing
Current
(Figure
SENSE
2) is commonly
is connected to
20032659
200326h0
14
HALF-WAVE RECTIFIER WITH RAIL-TO-GROUND
OUTPUT SWING
Since the LMV931/LMV932/LMV934 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.
In
4
rations implement the half wave rectifier since the LMV931/
LMV932/LMV934 can not respond to one-half of the incoming
waveform. It can not respond to one-half of the incoming be-
cause the amplifier can not swing the output beyond either
rail therefore the output disengages during this half cycle.
During the other half cycle, however, the amplifier achieves a
half wave that can have a peak equal to the total supply volt-
age. R
LMV932/LMV934.
the circuit is biased to the positive supply. These configu-
Figure 3
I
should be large enough not to load the LMV931/
the circuit is referenced to ground, while in
Figure