LDS3985   Product is in volume production.

Very low drop and low noise BiCMOS 300 mA voltage regulator

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The LDS3985 provides up to 300 mA, from 2.5 V to 6 V input voltage. It is stable with ceramic and high quality tantalum capacitor. The ultra low drop voltage, low quiescent current and low noise make it suitable for low power applications and battery-powered systems. Shutdown logic control function is available, this means that when the device is used as local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. Typical applications are mobile phones and similar battery-powered wireless systems, portable information appliances.

Key Features

  • Input voltage from 2.5 V to 6 V
  • Stable with low ESR ceramic capacitors
  • Very low dropout voltage (150 mV typ. at 300 mA load, 0.4 mV typ. at 1 mA load)
  • Very low quiescent current (85 µA typ. at no load, 200 µA typ. at 300 mA load; max.1.5 µA in OFF mode)
  • Guaranteed output current up to 300 mA
  • Wide range of output voltages available on request: fixed from 1.25 V to 5 V with 100 mV step
  • Fast turn-on time: typ. 240 µs
    • [CO = 2.2 µF, CBYP = 33 nF and IO= 1 mA]
  • Logic-controlled electronic shutdown
  • Internal current and thermal limit
  • Low output voltage noise: 30 µ VRMS over 10 Hz to 100 kHz
  • SVR of 55 dB at 1 kHz, 50 dB at 10 kHz
  • Temperature range: - 40 °C to 125 °C
  • Automotive grade product available in DFN6 package, temperature range: - 40 °C to 85 °C

Resources

Technical Documentation

Product Specifications
Description Version Size
DS4148 DS4148: Very low drop and low noise BiCMOS 300 mA voltage regulator 10.0 938 KB

Publications and Collaterals

Selection Guides
Description Version Size
Linear and Switching Voltage Regulators Selection Guide 3.0 370 KB
Brochures
Description Version Size
Brochure Power management guide 10.2018 4 MB
Low-dropout (LDO) linear voltage regulators - Quick Reference Guide 2.2 216 KB
Power management for handheld and portable 2.0 1 MB
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Sample & Buy

Part Number Package Packing Type Output Voltage (V) (nom) Output Tolerance (typ) Output Current (A) (nom) Marketing Status Unit Price (US$) * Quantity ECCN (US) Country of Origin More info Order from ST Order from Distributors
LDS3985M30R SOT23-5L Tape And Reel 3 3 0.3 Active 0.24 1000 EAR99 MALAYSIA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
LDS3985M25R SOT23-5L Tape And Reel 2.5 3 0.3 Active 0.24 1000 EAR99 MALAYSIA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
LDS3985PU33RY DFN6 3x3 Tape And Reel 3.3 3 0.3 Active 0.6 1000 EAR99 MALAYSIA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
LDS3985M28R SOT23-5L Tape And Reel 2.8 3 0.3 Active 0.24 1000 EAR99 MALAYSIA MORE INFO No availability reported, please contact our Sales office
LDS3985M18R SOT23-5L Tape And Reel 1.8 3 0.3 Active 0.24 1000 EAR99 MALAYSIA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
LDS3985PU33R DFN6 3x3 Tape And Reel 3.3 3 0.3 Active 0.401 1000 EAR99 MALAYSIA MORE INFO No availability reported, please contact our Sales office
LDS3985M33R SOT23-5L Tape And Reel 3.3 3 0.3 Active 0.24 1000 EAR99 MALAYSIA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
LDS3985M50R SOT23-5L Tape And Reel 5 3 0.3 Active 0.24 1000 EAR99 MALAYSIA MORE INFO No availability reported, please contact our Sales office
LDS3985PU15R DFN6 3x3 Tape And Reel 1.5 3 0.3 Active 0.24 1000 EAR99 MALAYSIA MORE INFO No availability reported, please contact our Sales office
LDS3985PU28R DFN6 3x3 Tape And Reel 2.8 3 0.3 Active 0.401 1000 EAR99 MALAYSIA MORE INFO No availability reported, please contact our Sales office
LDS3985M15R SOT23-5L Tape And Reel 1.5 3 0.3 Active 0.24 1000 EAR99 MALAYSIA MORE INFO Buy Direct Add to cart No availability reported, please contact our Sales office
LDS3985PU18RY DFN6 3x3 Tape And Reel 1.8 3 0.3 Active 0.6 1000 EAR99 MALAYSIA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
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(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
LDS3985M30R ActiveSOT23-5LIndustrialEcopack2 0 0
LDS3985M25R ActiveSOT23-5LIndustrialEcopack2 0 0
LDS3985PU33RY ActiveDFN6 3x3AutomotiveEcopack2
LDS3985M28R ActiveSOT23-5LIndustrialEcopack2
LDS3985M18R ActiveSOT23-5LIndustrialEcopack2 0 0
LDS3985PU33R ActiveDFN6 3x3IndustrialEcopack2
LDS3985M33R ActiveSOT23-5LIndustrialEcopack2 0 0
LDS3985M50R ActiveSOT23-5LIndustrialEcopack2
LDS3985PU15R ActiveDFN6 3x3IndustrialEcopack2
LDS3985PU28R ActiveDFN6 3x3IndustrialEcopack2
LDS3985M15R ActiveSOT23-5LIndustrialEcopack2
LDS3985PU18RY ActiveDFN6 3x3AutomotiveEcopack2 0 0
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(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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