LD3985   Product is in volume production.

Ultra low drop-low noise BiCMOS voltage regulators low ESR capacitors compatible

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The LD3985 provides up to 150 mA, from 2.5 V to 6 V input voltage. The ultra low drop voltage, low quiescent current and low noise make it suitable for low power applications and in battery-powered systems. Regulator ground current increases slightly in dropout only, prolonging the battery life. Power supply rejection is better than 60 dB at low frequencies and rolls off at 10 kHz. High power supply rejection is maintained down to low input voltage levels common to battery operated circuits. 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. The LD3985 is designed to work with low ESR ceramic capacitors. Typical applications are in mobile phones and similar battery-powered wireless systems.

Key Features

  • Input voltage from 2.5 to 6 V
  • Stable with low ESR ceramic capacitors
  • Ultra low-dropout voltage (60 mV typ. at 150 mA load, 0.4 mV typ. at1 mA load)
  • Very low quiescent current (85 μA typ. at no load, 170 μA typ. at 150 mA load; max.1.5 μA in OFF mode)
  • Guaranteed output current up to 150 mA
  • Wide range of output voltages: 1.22 V; 1.8 V; 2.5 V; 2.7 V; 2.8 V;2.9 V; 3.3 V; 4.7 V
  • Fast turn-on time: typ. 200 μs [CO = 1 μF, CBYP = 10 nF and IO = 1 mA]
  • Logic-controlled electronic shutdown
  • Internal current and thermal limit
  • Output low noise voltage 30 μVRMS over 10 Hz to 100 kHz
  • SVR of 60 dB at 1 kHz, 50 dB at 10 kHz
  • Temperature range: -40 °C to 125 °C

Resources

Technical Documentation

Product Specifications
Description Version Size
DS3355 DS3355: Ultra low drop and low noise BiCMOS voltage regulators 16.0 322.32 KB

Publications and Collaterals

Selection Guides
Description Version Size
Linear and Switching Voltage Regulators Selection Guide 3.0 370.88 KB
Brochures
Description Version Size
Brochure Power management guide 10.2018 4.42 MB
Low-dropout (LDO) linear voltage regulators - Quick Reference Guide 2.0 216.23 KB
Power management for handheld and portable 2.0 1.09 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
LD3985M47R SOT23-5L Tape And Reel 4.7 2 0.15 Active 0.192 1000 EAR99 MALAYSIA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
LD3985M25R SOT23-5L Tape And Reel 2.5 2 0.15 Active 0.192 1000 EAR99 MALAYSIA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
LD3985M33R SOT23-5L Tape And Reel 3.3 2 0.15 Active 0.192 1000 EAR99 CHINA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
LD3985M122R SOT23-5L Tape And Reel 1.22 2 0.15 Active 0.192 1000 EAR99 MALAYSIA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
LD3985M18R SOT23-5L Tape And Reel 1.8 2 0.15 Active 0.192 1000 EAR99 MALAYSIA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
LD3985M30R SOT23-5L Tape And Reel 3 2 0.15 Active 0.192 1000 EAR99 MALAYSIA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
LD3985M27R SOT23-5L Tape And Reel 2.7 2 0.15 Active 0.192 1000 EAR99 MALAYSIA MORE INFO DISTRIBUTOR AVAILABILITY
LD3985M29R SOT23-5L Tape And Reel 2.9 2 0.15 Active 0.192 1000 EAR99 MALAYSIA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
LD3985M28R SOT23-5L Tape And Reel 2.8 2 0.15 Active 0.192 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**
LD3985M47R ActiveSOT23-5LIndustrialEcopack2
LD3985M25R ActiveSOT23-5LIndustrialEcopack2
LD3985M33R ActiveSOT23-5LIndustrialEcopack2 0 0
LD3985M122R ActiveSOT23-5LIndustrialEcopack2
LD3985M18R ActiveSOT23-5LIndustrialEcopack2 0 0
LD3985M30R ActiveSOT23-5LIndustrialEcopack2
LD3985M27R ActiveSOT23-5LIndustrialEcopack2
LD3985M29R ActiveSOT23-5LIndustrialEcopack2 0 0
LD3985M28R ActiveSOT23-5LIndustrialEcopack2
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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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