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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
Featured Videos
All resources
Product Specifications (1)
| Resource title | Latest update | |||
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| 06 Dec 2019 |
06 Dec 2019
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Selection Guides (1)
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| 25 Mar 2020 |
25 Mar 2020
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Brochures (2)
| Resource title | Latest update | |||
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| 15 Feb 2019 |
15 Feb 2019
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| 26 Feb 2020 |
26 Feb 2020
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EDA Symbols, Footprints and 3D Models
STMicroelectronics - LD3985
Speed up your design by downloading all the EDA symbols, footprints and 3D models for your application. You have access to a large number of CAD formats to fit with your design toolchain.
Symbols
Footprints
3D models
Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| LD3985M122R |
Active
|
SOT23-5L | Industrial | Ecopack2 |
|
| LD3985M18R |
Active
|
SOT23-5L | Industrial | Ecopack2 | |
| LD3985M25R |
Active
|
SOT23-5L | Industrial | Ecopack2 |
|
| LD3985M27R |
Active
|
SOT23-5L | Industrial | Ecopack2 |
|
| LD3985M28R |
Active
|
SOT23-5L | Industrial | Ecopack2 |
|
| LD3985M29R |
Active
|
SOT23-5L | Industrial | Ecopack2 | |
| LD3985M30R |
Active
|
SOT23-5L | Industrial | Ecopack2 | |
| LD3985M33R |
Active
|
SOT23-5L | Industrial | Ecopack2 | |
| LD3985M47R |
Active
|
SOT23-5L | Industrial | Ecopack2 |
|
LD3985M122R
Package:
SOT23-5LMaterial Declaration**:
LD3985M25R
Package:
SOT23-5LMaterial Declaration**:
LD3985M27R
Package:
SOT23-5LMaterial Declaration**:
LD3985M28R
Package:
SOT23-5LMaterial Declaration**:
LD3985M47R
Package:
SOT23-5LMaterial Declaration**:
(**) 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.
Sample & Buy
| Part Number | Order from Distributors | Order from ST | Marketing Status | ECCN (US) | ECCN (EU) | Packing Type | Package | Temperature (°C) | Output Voltage (V) (nom) | Output Tolerance (typ) | Output Current (A) (nom) | Country of Origin | Budgetary Price (US$)*/Qty | More info | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | |||||||||||||||
| LD3985M47R | 2 distributors | Buy Direct |
Active
|
EAR99 | NEC | Tape And Reel | SOT23-5L | -40 | 125 | 4.7 | 2 | 0.15 | MALAYSIA | 0.192 / 1k | ||
| LD3985M25R | 5 distributors | Buy Direct |
Active
|
EAR99 | NEC | Tape And Reel | SOT23-5L | -40 | 125 | 2.5 | 2 | 0.15 | CHINA | 0.192 / 1k | ||
| LD3985M33R | 9 distributors | Buy Direct |
Active
|
EAR99 | NEC | Tape And Reel | SOT23-5L | -40 | 125 | 3.3 | 2 | 0.15 | CHINA | 0.192 / 1k | ||
| LD3985M122R | 3 distributors | Buy Direct |
Active
|
EAR99 | NEC | Tape And Reel | SOT23-5L | -40 | 125 | 1.22 | 2 | 0.15 | MALAYSIA | 0.192 / 1k | ||
| LD3985M18R | 5 distributors | Buy Direct |
Active
|
EAR99 | NEC | Tape And Reel | SOT23-5L | -40 | 125 | 1.8 | 2 | 0.15 | MALAYSIA | 0.192 / 1k | ||
| LD3985M30R | 5 distributors | Buy Direct |
Active
|
EAR99 | NEC | Tape And Reel | SOT23-5L | -40 | 125 | 3 | 2 | 0.15 | CHINA | 0.192 / 1k | ||
| LD3985M27R | 2 distributors | Buy Direct |
Active
|
EAR99 | NEC | Tape And Reel | SOT23-5L | -40 | 125 | 2.7 | 2 | 0.15 | MALAYSIA | 0.192 / 1k | ||
| LD3985M29R | 1 distributors | Buy Direct |
Active
|
EAR99 | NEC | Tape And Reel | SOT23-5L | -40 | 125 | 2.9 | 2 | 0.15 | MALAYSIA | 0.192 / 1k | ||
| LD3985M28R | 4 distributors | Buy Direct |
Active
|
EAR99 | NEC | Tape And Reel | SOT23-5L | -40 | 125 | 2.8 | 2 | 0.15 | MALAYSIA | 0.192 / 1k | ||
(*) 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