LDO Recommendations for 5V to 3.3V

vasyl

vasyl

Which LDO would you recommend for a 5V input and 3.3V output with low noise and a maximum current of 750mA?

flux

2:10

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Searching library for: "Low-noise LDO voltage regulator for converting 5V input to 3.3V output at up to 750mA load. Need fixed 3.3V output, low output noise and good PSRR, suitable dropout margin from 5V to 3.3V, prefer common modern parts with datasheets and good availability. Please find strong candidates around 750mA to 1A output current."

Creating search plan for: "Low-noise LDO voltage regulator for converting 5V input to 3.3V output at up to 750mA load. Need fixed 3.3V output, low output noise and good PSRR, suitable dropout margin from 5V to 3.3V, prefer common modern parts with datasheets and good availability. Please find strong candidates around 750mA to 1A output current. --- MANDATORY search constraints (these MUST be applied to all searches): fieldCategories: ["core","type","manufacturer","specifications","availability","packaging"] hitsPerPage: 10 page: 0"

Searching: "Low-noise fixed 3.3V LDO regulator, 750mA to 1A output, good PSRR and low output noise, VIN=5V input, dropout <1.7V, prefer common modern parts and good availability"

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Searching: "Low-noise LDO voltage regulator for converting 5V input to 3.3V output at up to 750mA load. Need fixed 3.3V output, low output noise and good PSRR, suitable dropout margin from 5V to 3.3V, prefer common modern parts with datasheets and good availability. Please find strong candidates around 750mA to 1A output current. --- MANDATORY search constraints (these MUST be applied to all searches): fieldCategories: ["core","type","manufacturer","specifications","availability","packaging"] hitsPerPage: 10 page: 0"

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Looking for "fixed output voltage, max output current, input voltage range, dropout voltage near 750 mA or full load, output noise, PSRR, required input and output capacitors, package" in 1912111437_MICRONE-Nanjing-Micro-One-Elec-ME6217C33M5G_C427602.pdf

Looking for "fixed output voltage, max output current, input voltage range, dropout voltage near 750 mA or full load, output noise, PSRR, required input and output capacitors, package" in XC6220.pdf

Looking for "fixed or adjustable output range, max output current, input voltage range, dropout voltage near 750 mA, output noise, PSRR, required input and output capacitors, package" in tps777.pdf

For your requirements, I’d start with TPS77801_SO8 or, if you want a fixed 3.3 V part in a smaller package, ME6217C33M5G.

My recommendation

PartWhy it stands outWatch-outs
TPS77801_SO8Best fit if low noise is the priority. Datasheet shows a 750 mA LDO family, 260 mV typ dropout at 750 mA for the 3.3 V version, and dedicated PSRR plots for the 3.3 V variant.The specific library item is adjustable, so you’d set it to 3.3 V with resistors. It also needs 10 µF output capacitance with ESR in the specified range.
ME6217C33M5GGood simple choice if you want fixed 3.3 V and enough current. Datasheet gives 800 mA max, 2.0 V to 6.5 V input range, and 65 dB typ PSRR at 1 kHz.Datasheet extract does not specify output noise, so I can’t call it the best low-noise choice with confidence.
XC6220B331MRHas more current headroom: 1 A class, 1.6 V to 6.0 V input range.PSRR is only 50 dB typ at 1 kHz, and I don’t have output-noise data from the extracted datasheet text, so it’s less compelling for a low-noise rail.
Bottom line
With 5 V in and 3.3 V out, dropout is not the limiting factor here, but thermal dissipation still matters:
  • Power loss at 750 mA is about (5.0 - 3.3) × 0.75 = 1.275 W
So whichever LDO you choose, package thermal performance and copper area will be important.
If you want, I can next narrow this to:
  • lowest noise
  • smallest package
  • best thermal margin
  • or best availability/cost
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Meshtastic Low Power

Meshtastic ESP32-S3 node with 5 V input, 3.3 V low-noise regulation, and I2C expansion.

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