Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [quiescent]

30 questions
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2 answers

Replace AMS1117 5V-3.3V LDO on NodeMCU for LiPo with low quiescent current

I want use my NodeMCU to drive a SIM808 Module with integrated LiPo Charger. https://www.itead.cc/wiki/SIM808_GSM/GPRS/GPS_Module There are two problems. First of all the SIM808 Module just provides the LiPo Voltage, no steady 3.3V or 5V output. The…
Schr0nk
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2 answers

Transistor design with beta variation

I am studying Schilling-Belove Electronic Circuits, 3rd Ed. where in its second chapter under the "Maximum Symmetrical Swing" section it gives an example where the base current is kept constant and the beta is varied from 200 to 400 which makes the…
nn08
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2N2222 transistor datasheet saturation current

I am designing a 2N2222 transistor common emitter voltage-divider amplifier. Using 9V for the power supply and trying to make the loadline to determine Q. How do I determine the sauration point current for the load line?
SamR
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Low-power high-range current monitoring

I'm working on a power circuit for a device that is usually battery powered. Most of the time, the device is sleeping and sipping at power around ~5uA, which is great for battery life. In this state, the device will be powered by an LDO with a…
Helpful
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Low quiescent current boost converter for battery application (Io < 200 μA)

I am designing a PIR sensor alarm. It must be able to run on batteries for about a year. I am using 3.7 V Li-ion batteries to power an ATtiny24 directly. Although my PIR senor needs 5 V as recommended, it has HT7133 LDO to drop input to 3.3V so it…
CaveScientist
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3 answers

Reducing quiescent current of MOSFET pullup/pulldown

I have a device which will run off a 2.7-60V power source. The voltage may go up to 80V during surges. I have a couple of input protection circuits which use N or P channel MOSFETs and require pullups or pulldowns. Currently I am using a resistor…
Michael Lawton
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Why change the quiescent current in an op-amp? (LM4250)

I am trying to understand the LM4250 op-amp. Datasheet: http://www.ti.com/lit/ds/symlink/lm4250.pdf Main description: Pin-outs for DIP: Example circuit: It appears that pin 8 (quiescent current set) can be used to change the quiescent…
Nick Gammon
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2
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1 answer

Measuring quiescent current of a voltage regulator

I purchased 10PCS Socket Adapter plate Board For NRF24L01+ Wireless Transceive​ module and would like to know how much current/power it will draw as I want to run a project on batteries. A close-up of the unit is below. Using a multimeter, I…
Paul Grime
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How to control/remove "quiescent current" of UniversalOpamp2

In the circuit below, I get a quiescent current (entering positive supply and leaving negative supply of the op amp) of about 497 µA, while the load current is only 5 µA. I am aware that this purported quiescent current has no real-world…
tobalt
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MMA8452 high quiescent current consumption

I have designed a PCB where I am using the MMA8452Q accelerometer. Because it is a battery powered device, we want to ensure that we are using the lowest sleep current states of all the components on board. However, while testing we noted that the…
soumya panda
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Supply current vs quiescent current

I'm currently making a power/current consumption budget. Is there a difference between the quiescent current and supply current? I know the quiescent current is the current that when there is no load and is at a steady state. In comparison, the…
kurcio
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What does quiescent power mean and how I can find how much current the chip consume

I was checking this datasheet about a multiplexer. It says: This device handles rail-to-rail analog signals and consumes less than 4μW of quiescent power. Checking the tables below it says that Off-Leakage Current is about a couple of…
NicoCaldo
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Biasing a second stage amplifier

I built a two-stage amplifier as shown below. I have already built the first satge (R1-R5 & C1-C2) such that If I apply a signal of 1volts peak-peak, the output (at collector of Q1) would be 8 volts peak-to-peak (without the second stage). I wanted…
William
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How do you measure quiescent current?

How do you measure quiescent current? (For instance, a Battery connected device)
Roo
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Calculate the total max power dissipation in CLASS AB push pull for reactive loads

As worst case we can assume in reactive load the same power dissipation with the resistive part of that load. Thus for a 8 ohm impedance with phase angle of 60°, we can use \$R_L=0.5*R_{Reactive}=4\Omega\$. Given a push-pull with power supply Vcc+…
Gianluca G
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