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A Low Drop-Out or LDO regulator is a DC linear voltage regulator which can operate with a very small input–output differential voltage.

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LM27762 is a charge pump combined with an LDO. It outputs a +2.5 V and a -2.5 V. The charge pump portion switches at 2 MHz. I am not worried about the ripple noise at 2 MHz + harmonics I will take ...
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There is an SMD component with an F marking which I need to identify. The desoldered 5 pin component, which is right beside it, has a marking 'PD1J' which I think is a 1.8V LDO. The component with ...
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I want to build a variable power supply with an op-amp based current limiting to work on CC and CV modes. I thought of a circuit based on the example from TI LM350 datasheet, on page 12 (image 1 below)...
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Consider this theoretical example (not real case) with this Low Drop-out voltage regulator in which 5 V comes from a power supply: 1) Does it make sense to put a 100uF capacitor in the input? The ...
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Say I have a load instrumented with Kelvin feedback wires (VCCS and GNDS) for the purpose of, ideally, canceling the voltage ...
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I’m designing a small board with a external IMU that requires 3.3 V ±7%, nominal current of about 0.1 A, and a max start current of 1.5 A according to its datasheet. I have very limited space, so I’d ...
Knowledge's user avatar
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I am using a LTM8058MPY component to step down from a 25-30 Vdc power source, to a Vout1=13Vdc lower voltage power. The configuration in question is an adaptation of the application examples that the ...
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As the title says, I’m looking for feedback on a very simple, home-built LDO and the stability analysis. This is purely about understanding the behavior and checking my LTspice simulations. 🙂 After ...
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I want to use an LM1084 and two resistors to limit the voltage to 21.9V I have removed the reference design capacitors, assuming that stability should not be an issue here. Could that lead to nasty ...
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Need Chip identified it's a LDO Voltage Regulator on the control board of a Dyson V12 Slim. The Chip is marked 8A127 an regulates power to a Micro Processor ATSAMC21E18A-U.
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I made a very basic board with a STM32H573IIT3Q microcontroller (and the required VDD/Vcore/NRST capacitors, and not much else). As per p. 407 of the manual, I expect the LDO to be enabled after power-...
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I am using this LDO in my design. The datasheet says the below thing about this LDO Enable pin. My circuit is given below. Analog devices AE team which reviewed the schematic says the below thing. • ...
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In a document by Analog Devices, these two figures are given. I want to understand which circuits elements correspond to each block on the block diagram of the regulator. I can tell Q18 and Q19 form ...
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I am designing a stand alone board with AD5941. First time I am doing the layout of a board like this. The LDO used for powering the ADC is ADM7155. The schematic diagram of power section is given ...
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I designing an electrochemical sensor readout using Ad5941.The LDO used for powering the ADC is ADM7155. In the reference design all the capacitors and resistors used are 0603 package.In my design I ...
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I have what seems to me to be an LDO (or less likely voltage detection IC / transistor) to identify. It's coming from PS4 SAB-001 motherboard, marking is 'X9', and I have an exact same model of ...
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This is a continuation of this question I previously asked. I will be using this ADC in my design. It has two power rails AVDD and DVDD. I am planning to use two TLV75533PDBVR will be used one for ...
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I am using AD5941 in my design. The power section of its analog domain (AVDD) is given below. It is obtained from the reference design. You can see the schematics, BOM etc in bottom of this page. The ...
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I have a device that works with two voltage levels (5V and 3V3). The first one (5V) is used for addressable LEDs (and other peripherals), and the second one (3V3) for an MCU (STM32F3). The device ...
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I have just seen an LDO schematic where a diode is used at the input. The LDO is a MIC5365. For an output voltage of 3.3 V and an input voltage of up to 5 V, what would be the correct diode to use for ...
ulix's user avatar
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Why is this diode required? Unlike battery, +12V is derived from a converter (with significant o/p capacitance). Had there been no diode, when +12V converter is powered off, the rail would gradually ...
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I am creating a PCB design to power an ESP32 using a 3.7 V lithium-ion cell, which will be charged via a 5 V solar panel and TP4056. The main challenge I face is selecting an LDO (Low-Dropout ...
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I'm implementing the ES9218P DAC/amp, and there is a power-up sequence recommendation. I'm planning on using separate LDOs for all digital and analog 1.8V and 3.3V supplies (the digital 3.3V is for ...
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Greetings to all the masters and seniors on the forum!​ I am currently preparing for an upcoming interview opportunity at my dream company. Through my past experiences, I've realized that the depth ...
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I’m looking for a low noise LDO preferably 3V to supply an AOM-5024L-HD-R (~5-10mA), note a 3.7v Lipo battery supplies the LDO. I am currently using a LT3045 configured to output 3.3V (Prebuilt board),...
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I am using this in a project to power the STM32's VDDA pin. The MCU's main power is supplied from a buck switching converter, so the datasheet says to use a linear regulator to power the ADC since ...
aud098's user avatar
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I've found the circuit below in this publication: Chen, Jiann-Jong, et al. "Low-quiescent-current fast-response current-feedback shunt regulator." APCCAS 2008-2008 IEEE Asia Pacific ...
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I have the following DC-DC convertor: MEJ2D0512SC The output of the this module is ±12V and I need to reduce it to ±7V, Would you please share you though what is the best approach? Possible approach: ...
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I am designing my first PCB and it uses an STM32WBA63 MCU. In the power scheme diagram (p97 of the datasheet), it is written "n x 100nF + 10 µF" for the corresponding n VDD pins (in my case: ...
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I am working on ESC 4in1 for an FPV drone, and I couldn't identify a specific ic to replace it in my design. Here is the picture of the IC:
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When trying to slightly limit the power dissipation of an LDO, is it a good approach to place a diode/Schottky in series with VIN to drop the input voltage slightly and shift some of the power ...
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Could you please help me identify this component? It is part of ESC 4 in 1, I assume in power regulation. IC:
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I am encountering an issue with poorer than expected transient response of a regulator, causing voltage sags leading to browning-out of devices on the rail. Board Design I am using the XC6210B332MR (...
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I am using the LM5164QDDARQ1 buck converter to step down 52V from a lithium-ion battery to 5V at 1A for a battery charging application. My system also uses CAN communication to monitor the charging ...
Akash Kumar's user avatar
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Why does output noise reduce with frequency (in particular at frequencies beyond 1 MHz)? I think it is a general principle of physics but I am not able to explain it. Here is a typical graphic showing ...
Jess's user avatar
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I have a capacitive divider and a bootstrapped switch in an IC, with the switch being triggered to close by on-chip digital logic for just 20ns. The reference voltage (VCM) is currently supplied by a ...
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I have read this interesting article about LDO and particulary the AC analysis of it. They mention the equation of the output impedance and I would want to know the equivalent schematic of it. Why ZO ...
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I attempted to add an LDO to the output of a DC-DC converter to reduce output ripple. However, I observed that the presence of the LDO significantly alters the performance of the DC-DC converter. ...
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This is my first post, thank you for the help in advance :) Background: I am designing a power section (3.3V LDO) for a custom ESP32 board. I am using the MCP73831-2-OT (https://ww1.microchip.com/...
Arachne's user avatar
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For typical designs that need a positive and negative supply rail, it seems common to use different parts which are a positive regulator (LDO) and negative regulator. Is it possible to use a positive ...
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I recently built a PCB that uses a LP38693SD-3.3 LDO to step down +5V to +3.3V. Today when I assembled all the components on the PCB I was surprised that the output of the LDO is +5V, the same as the ...
Robert's user avatar
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I'm designing the power supply part of a little camera module using the AR0134CS sensor. When using the iLCC Package it has these power supply pins: VDD_IO (2.8V) VDD (1.8V) VDD_PLL (2.8V) VAA (2.8V) ...
Blue's user avatar
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At the moment I work on designing a device and I can't understand which principle/rules should be used to select a DC/DC and LDO for power supplying digital ICs. I have the following ICs - 6 sensor ...
Fahrenheit's user avatar
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I use an LDO (MIC2941A) to supply constant current (~100mA) for charging a large super capacitor. Input voltage to the LDO is 12V. When the super capacitor is charged to circa 12V, there is no other ...
s0rent's user avatar
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This is from the datasheet for the TPS786 LDO: I am trying to understand how the SHUTDOWN' input to the error amplifier causes shutdown mode. The datasheet says: My understanding is that when EN is ...
charles's user avatar
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I have designed the following circuit for converting 11 V to 5 V (3 A), by using LT3083: The schematic: The PCB: Fabricated PCB: I have used two power resistors to make 1.7 Ω for drawing 3 A, the ...
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I want to design a variable output regulator to convert 12V to -10V to 0V @1.5A. My idea is to convert 12V to -10V using an LTC7149: I have 40mV ripple at 1.5A. I need to reduce this ripple as much ...
Andromeda's user avatar
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I am using the LP38693SD-3.3/NOPB (datasheet) power converter to step down +5V to +3.3V. I used the WEBENCH power designer tool from TI for the schematic and I chose the input and output capacitors ...
Robert's user avatar
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I'm not sure if this circuit design feasible, but i would like to have multiple voltages output coming from a single LiPo battery (3.7 - 4.2V). Initially the battery output to a switching DC-DC boost ...
Kenny Thum's user avatar
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I am using TI TPS70933DBVR LDO. Input: 12.6V (3S 18650 Battery) Output: fixed 3.3V When I connect the battery to circuit, the LDO is over heating and after 3 second, it will be burned but if I use 4....
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