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STMicroelectronics LD2982BM30R
- Part No.:
- LD2982BM30R
- Manufacturer:
- STMicroelectronics
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LD2982BM30R.pdf
- Description:
- IC REG LINEAR 3V 50MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,789
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Product details
Overview
LD2982BM30R from STMicroelectronics is a 50 mA fixed-output low-dropout linear voltage regulator with 1.8 V output, 120 mV dropout at 50 mA, 30 µVrms output noise, and TTL-compatible inhibit control on Pin 3. It operates from −40 °C to +125 °C and supports stable regulation with only 1 µF ceramic output capacitor - ideal for battery-powered portable electronics requiring ultra-low quiescent current and low-noise power rails.
For engineers reviewing the LD2982BM30R datasheet, LD2982BM30R pinout, LD2982BM30R application, or LD2982BM30R equivalent, key selection criteria include dropout performance at light load (7 mV @ 1 mA), shutdown current (<1 µA), ±1% output tolerance at 25 °C, bypass-capacitor–enabled noise reduction, and SOT23-5L footprint compatibility in space-constrained designs.
Technical Context
The LD2982BM30R integrates a PMOS pass transistor enabling ultra-low dropout operation and uses internal feedback resistors (42.6 kΩ / 51.15 kΩ) to set the 1.8 V output. Its inhibit function disables regulation when Pin 3 is pulled below 0.15 V, reducing quiescent current to sub-microamp levels without external circuitry.
Stability is achieved with low-ESR ceramic capacitors: minimum 2.2 µF output capacitance required for 1.8 V versions, and a dedicated Bypass pin (Pin 4) accepts a 10 nF capacitor to reduce thermal noise to 30 µVrms across 300 Hz–50 kHz bandwidth.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V ±1% at 25 °C - ensures precise rail generation for 1.8 V logic and memory interfaces |
| Dropout Voltage | 120 mV at 50 mA - enables regulation down to VIN = 1.92 V, extending battery runtime |
| Quiescent Current | 75 µA at 1 mA load; <1 µA in inhibit mode - critical for always-on subsystems in portable devices |
| Output Noise | 30 µVrms (300 Hz–50 kHz, 10 nF bypass) - meets low-noise analog/RF supply requirements |
| Supply Rejection | 45 dB at 1 kHz - suppresses switching noise from upstream DC/DC converters |
| Operating Temp | −40 °C to +125 °C junction - supports industrial and extended-temperature embedded applications |
| Max Output Current | 50 mA continuous - suitable for powering microcontroller cores, sensors, or interface ICs |
Pinout & Package
LD2982BM30R is housed in a compact SOT23-5L package (2.8 × 1.75 × 1.3 mm), optimized for high-density PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input voltage supply connection | Accepts 2.5 V to 16 V input; requires ≤0.5″ placement of 1 µF input capacitor to clean analog ground |
| 2 GND | Power ground reference | Common return path for input, output, inhibit, and bypass; must connect to clean analog ground plane |
| 3 INHIBIT | Logic-controlled enable/disable input | TTL-compatible; device disabled when voltage <0.15 V; must not float - tie to VIN if unused |
| 4 BYPASS | Noise-reduction capacitor terminal | Connects 10 nF capacitor to GND to lower output noise from 120 µVrms to 30 µVrms |
| 5 OUT | Regulated 1.8 V output | Delivers up to 50 mA; requires ≥2.2 µF low-ESR ceramic capacitor placed within 0.5″ of pin |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 7 mV at 1 mA load enables operation near battery end-of-life (e.g., single-cell Li-ion down to 1.87 V) |
| Sub-µA shutdown | <1 µA quiescent current in inhibit mode extends shelf life and standby time in IoT endpoints |
| Dedicated noise bypass | Separate Bypass pin allows 10 nF capacitor to reduce integrated noise by >60% without affecting stability |
| Low-ESR capacitor support | Stable with 2.2 µF X7R ceramic output cap - eliminates need for costly tantalum or polymer alternatives |
| Reverse-current blocking | No body diode between IN and OUT; prevents backfeed when output voltage exceeds input (e.g., hot-swap scenarios) |
Applications
| Wearable Sensor Node | Portable Medical Monitor |
|---|---|
|
Use Scenario: Powering MEMS accelerometers and BLE SoCs in ultra-thin wrist-worn devices with coin-cell batteries. IC Role / Device Role / Timing Role: Local 1.8 V LDO supplying sensor analog front-end and radio transceiver core logic. Use Value: 75 µA quiescent current and 7 mV dropout preserve battery capacity over multi-week deployments; 30 µVrms noise avoids ADC quantization errors. |
Use Scenario: Regulating power for ECG signal conditioning circuitry and display driver in handheld diagnostic tools. IC Role / Device Role / Timing Role: Low-noise 1.8 V supply for precision op-amps and SAR ADC reference buffers. Use Value: Bypass-pin–enabled 30 µVrms noise meets clinical-grade signal integrity requirements; −40 °C to +125 °C rating supports sterilization cycles. |
| Industrial PLC I/O Module | Smart Camera Edge Processor |
|
Use Scenario: Providing clean 1.8 V bias to isolated digital I/O drivers in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Local post-regulator decoupling LDO downstream of isolated DC/DC converter. Use Value: 45 dB PSRR rejects switching noise from upstream 1 MHz flyback; SOT23-5L footprint eases layout in tight I/O channel spacing. |
Use Scenario: Powering image signal processor (ISP) core and MIPI CSI-2 PHY in battery-operated surveillance cameras. IC Role / Device Role / Timing Role: Dedicated 1.8 V rail for ISP logic and high-speed serial interface termination. Use Value: Inhibit control synchronizes power-down with camera sleep mode, cutting system idle current by >95%; 120 mV dropout sustains operation during brownout events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, low-IQ LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6206P182MR | 1.8 V, 100 mA, 120 mV dropout, but no inhibit pin or bypass pin; 40 µVrms noise | Lacks active shutdown and noise-reduction capability - unsuitable for systems requiring sub-µA standby or <40 µVrms noise | Select only if higher output current (100 mA) is needed and inhibit/bypass features are unnecessary |
| Richtek RT9193-18GB | 1.8 V, 300 mA, 250 mV dropout, inhibit pin present, but 65 µVrms noise and no dedicated bypass pin | Higher noise and dropout limit use in precision analog or long-battery-life applications | Prefer when higher load current is required and moderate noise (65 µVrms) is acceptable |
Compared with XC6206P182MR and RT9193-18GB, LD2982BM30R uniquely combines sub-µA shutdown, dedicated noise-bypass functionality, and 30 µVrms output noise - making it optimal for ultra-low-power, high-fidelity analog subsystems where both efficiency and signal integrity are co-critical.
Availability
LD2982BM30R is available at Aetrix Electronics and suitable for wearable electronics, portable medical instruments, industrial I/O modules, and smart camera edge processors requiring stable component supply across extended temperature ranges and low-noise power delivery.
Supply support for LD2982BM30R includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing silicon solutions for automotive, industrial, and consumer markets since 1987.
The LD2982 series belongs to ST's high-performance analog LDO portfolio, engineered specifically for battery-powered and noise-sensitive applications demanding ultra-low dropout, micropower shutdown, and integrated noise mitigation.
FAQ
What is the minimum output capacitance required for stability with LD2982BM30R at 1.8 V?
The LD2982BM30R requires a minimum 2.2 µF ceramic output capacitor with low ESR for stable operation at 1.8 V output. This value is specified in ST's Application Note section 6.3 and verified across −40 °C to +125 °C. Using less than 2.2 µF risks oscillation unless a series resistor is added per design guidance.
Can the INHIBIT pin be left unconnected?
No - the INHIBIT pin (Pin 3) has no internal pull-up or pull-down and must never be left floating. If shutdown functionality is unused, ST specifies connecting it directly to the input voltage (VIN) to ensure reliable regulation. Floating the pin may cause erratic enable/disable behavior or increased quiescent current.
How does the BYPASS pin reduce output noise?
The BYPASS pin (Pin 4) connects to a 10 nF capacitor tied to ground, which shunts high-frequency thermal noise from the internal bandgap reference. This reduces integrated output noise from ~120 µVrms to 30 µVrms over 300 Hz–50 kHz, as measured in the Electrical Characteristics table under parameter eN.
Is LD2982BM30R compatible with ceramic capacitors only?
Yes - the LD2982BM30R is optimized for ceramic output capacitors (X7R or better) due to their low ESR and stable capacitance over temperature. Tantalum capacitors may work but are discouraged due to higher cost, larger size, and ESR drift; aluminum electrolytics are incompatible and will cause instability.
LD2982BM30R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.225V @ 50mA
- Current - Output:
- 50mA
- Current - Quiescent (Iq):
- 150 µA
- Current - Supply (Max):
- 1.2 mA
- PSRR:
- 45dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LD2982BM30R FAQ
1.How can I place an order for LD2982BM30R through Aetrix?
Please submit a Request for Quotation (RFQ) for LD2982BM30R on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LD2982BM30R reliable?
The price and inventory of LD2982BM30R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD2982BM30R is usually 5 days.
3.What payment methods are accepted for LD2982BM30R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD2982BM30R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD2982BM30R?
LD2982BM30R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD2982BM30R order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LD2982BM30R?
For technical support, including LD2982BM30R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD2982BM30R requirements.
6.How does Aetrix verify that LD2982BM30R is sourced from the original manufacturer or authorized distributors?
All LD2982BM30R products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LD2982BM30R meets industry standards.
7.What is the process for return or replacement of LD2982BM30R?
All LD2982BM30R units undergo pre-shipment inspection (PSI). If there is an issue with LD2982BM30R, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LD2982BM30R part is unused and in its original packaging.
Return procedure for LD2982BM30R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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