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The LD2981 is a 100 mA fixed-output voltage regulator. The low-drop voltage and the ultra low quiescent current make them suitable for low noise, low power applications and in battery powered systems.
The quiescent current in sleep mode is less than 1 μA when INHIBIT pin is pulled low. Shutdown logic control function is available on pin n° 3 (TTL compatible). 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 LD2981 is designed to work with low ESR ceramic capacitor. Typical applications are in cellular phone, palmtop/laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera.
Key Features
- Ultra low dropout voltage (0.17 V typ. at 100 mA load, 7 mV typ. at 1 mA load)
- Very low quiescent current (80 μA typ. at no load in on mode; max 1 μA in off mode)
- Guaranteed output current up to 100 mA
- Logic-controlled electronic shutdown
- Output voltage of 2.5; 3.0; 3.3; 5.0 V
- Internal current and thermal limit
- ± 0.75% tolerance output voltage available (A version)
- Output low noise voltage 160 μVRMS
- Temperature range: -40 to 125 °C
- Small package SOT23-5L and SOT-89
- Fast dynamic response to line and load changes
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| LD2981ABM30TR | Active | SOT23-5L | Industrial | Ecopack2 | |
| LD2981ABM33TR | Active | SOT23-5L | Industrial | Ecopack2 | |
| LD2981ABM50TR | Active | SOT23-5L | Industrial | Ecopack2 | |
| LD2981ABU33TR | Active | SOT-89 | Industrial | Ecopack2 | |
| LD2981ABU50TR | Active | SOT-89 | Industrial | Ecopack2 | |
| LD2981CM30TR | Active | SOT23-5L | Industrial | Ecopack2 | |
| LD2981CM33TR | Active | SOT23-5L | Industrial | Ecopack2 | |
| LD2981CM50TR | Active | SOT23-5L | Industrial | Ecopack2 | |
| LD2981CU33TR | Active | SOT-89 | Industrial | Ecopack2 | |
| LD2981CU50TR | Active | SOT-89 | Industrial | Ecopack2 |
(**) 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 | Package | Packing Type | Output Voltage (V) (nom) | Output Tolerance (typ) | Output Current (A) (nom) | Marketing Status | ECCN (US) | Country of Origin | Budgetary Price (US$)*/Qty | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LD2981ABU50TR | 8 distributors | Buy now | SOT-89 | Tape And Reel | 5 | 0.75 | 0.1 | Active | EAR99 | CHINA | 0.209 / 1k | |
| LD2981CM33TR | 7 distributors | Buy now | SOT23-5L | Tape And Reel | 3.3 | 0.75 | 0.1 | Active | EAR99 | CHINA | 0.217 / 1k | |
| LD2981ABM50TR | 6 distributors | Buy now | SOT23-5L | Tape And Reel | 5 | 0.75 | 0.1 | Active | EAR99 | CHINA | 0.262 / 1k | |
| LD2981CM30TR | 2 distributors | Buy now | SOT23-5L | Tape And Reel | 3 | 0.75 | 0.1 | Active | EAR99 | MALAYSIA | 0.217 / 1k | |
| LD2981ABU33TR | 8 distributors | Buy now | SOT-89 | Tape And Reel | 3.3 | 0.75 | 0.1 | Active | EAR99 | CHINA | 0.209 / 1k | |
| LD2981ABM30TR | 6 distributors | Buy now | SOT23-5L | Tape And Reel | 3 | 0.75 | 0.1 | Active | EAR99 | MALAYSIA | 0.262 / 1k | |
| LD2981ABM33TR | 6 distributors | Buy now | SOT23-5L | Tape And Reel | 3.3 | 0.75 | 0.1 | Active | EAR99 | CHINA | 0.262 / 1k | |
| LD2981CU50TR | 6 distributors | Buy now | SOT-89 | Tape And Reel | 5 | 0.75 | 0.1 | Active | EAR99 | CHINA | 0.166 / 1k | |
| LD2981CM50TR | 6 distributors | Buy now | SOT23-5L | Tape And Reel | 5 | 0.75 | 0.1 | Active | EAR99 | CHINA | 0.217 / 1k | |
| LD2981CU33TR | 6 distributors | Buy now | SOT-89 | Tape And Reel | 3.3 | 0.75 | 0.1 | Active | EAR99 | CHINA | 0.166 / 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
