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STMicroelectronics LD2982BM15R
- Part No.:
- LD2982BM15R
- Manufacturer:
- STMicroelectronics
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LD2982BM15R.pdf
- Description:
- IC REG LINEAR 1.5V 50MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,699
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Product details
Overview
LD2982BM15R from STMicroelectronics is a 50 mA fixed-output low-dropout linear voltage regulator with 1.5 V output, ultra-low dropout (7 mV at 1 mA), 30 µVRMS output noise, logic-controlled inhibit function, and SOT23-5L package - designed for noise-sensitive, battery-powered portable electronics requiring precise local regulation.
For engineers reviewing the LD2982BM15R datasheet, LD2982BM15R pinout, LD2982BM15R application, or LD2982BM15R equivalent, this regulator delivers verified low-noise performance in compact footprint, supports TTL-compatible shutdown control, and enables sub-1 µA sleep-mode current draw - critical for power budgeting in handheld and wearable systems.
Technical Context
The LD2982BM15R integrates a PNP pass transistor architecture enabling ultra-low dropout voltage and minimal quiescent current across load range. Its internal feedback loop is optimized for stability with 1 µF ceramic output capacitors and includes dedicated bypass pin (Pin 4) for external 10 nF capacitor to reduce thermal noise to 30 µVRMS.
Inhibit logic operates at Pin 3 with TTL-compatible thresholds (VIL ≤ 0.15 V, VIH ≥ 2 V); pulling INHIBIT low disables output and reduces quiescent current to <1 µA. The device features internal current and thermal limiting, reverse-current protection (no body diode), and operates over –40 °C to +125 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.5 V ±1% (at 25 °C, A-version tolerance) - ensures stable core supply for low-voltage microcontrollers and sensors. |
| Dropout Voltage | 7 mV at 1 mA load - enables regulation from input as low as 1.507 V, extending battery runtime in single-cell Li-ion or alkaline systems. |
| Quiescent Current | 100 µA typ. at 1 mA load; <1 µA in inhibit-off state - minimizes standby power loss in always-on subsystems. |
| Output Noise | 30 µVRMS (300 Hz–50 kHz, with 10 nF bypass cap) - meets stringent noise requirements for RF front-ends and precision ADC references. |
| Supply Rejection | 45 dB typ. at 1 kHz - suppresses ripple from noisy DC-DC converters feeding the LDO input. |
| Stability Capacitor | 1 µF ceramic output capacitor sufficient for VO = 1.5 V - eliminates need for costly low-ESR tantalum or polymer caps. |
| Operating Temp | –40 °C to +125 °C junction - supports industrial and automotive under-hood ambient conditions when derated. |
Pinout & Package
SOT23-5L package: 5-pin surface-mount, 1.3 mm height, 2.8 × 1.75 mm footprint, ECOPACK® compliant, thermal resistance RthJA = 255 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input voltage supply port | Accepts 2.5–16 V DC; requires 1 µF input capacitor within 12.7 mm of pin for transient immunity. |
| 2 GND | Ground reference | Analog ground return for feedback network and bypass capacitor; must be low-impedance path to system ground plane. |
| 3 INHIBIT | Logic-controlled enable/disable input | TTL-compatible; drives regulator into <1 µA shutdown when ≤0.15 V; must not float - tie to VI if unused. |
| 4 Bypass | Noise-reduction terminal | Connects external 10 nF capacitor to GND to lower output noise from 60 µVRMS to 30 µVRMS. |
| 5 OUT | Regulated output | Delivers 1.5 V ±1% at up to 50 mA; requires 1 µF ceramic output cap placed ≤12.7 mm from pin for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 7 mV at 1 mA enables operation with <10 mV headroom - ideal for single-cell battery systems near end-of-life. |
| Sub-µA shutdown | <1 µA quiescent current in inhibit mode extends shelf life and enables long-term sensor wake-on-event designs. |
| Low-noise architecture | 30 µVRMS output noise with 10 nF bypass cap meets noise floor requirements for audio codecs and RF synthesizers. |
| Capacitor flexibility | Stable with 1 µF ceramic output cap - avoids cost/size penalties of tantalum and simplifies BOM for high-volume portable designs. |
| Reverse-current blocking | No intrinsic body diode between IN and OUT - prevents backfeed when output voltage exceeds input (e.g., hot-swap scenarios). |
Applications
| Wearable Health Sensor Node | Portable Audio DAC Supply |
|---|---|
|
Use Scenario: Ultra-low-power ECG/PPG sensor node powered by coin cell, requiring continuous analog front-end bias with minimal self-heating. IC Role / Device Role / Timing Role: Local 1.5 V LDO supplying ADC reference and op-amp rails, synchronized to MCU sleep/wake cycles via INHIBIT pin. Use Value: 7 mV dropout preserves usable battery voltage down to 1.507 V; 30 µVRMS noise prevents baseline drift in sub-µV biomedical signals. |
Use Scenario: High-fidelity portable DAC in Bluetooth earbuds, where switching noise from main PMIC must not modulate audio output. IC Role / Device Role / Timing Role: Dedicated low-noise 1.5 V supply for DAC core and I²S interface receiver, decoupled from noisy digital rails. Use Value: 45 dB PSRR at 1 kHz rejects PMIC ripple; 1 µF ceramic stability simplifies layout in space-constrained earbud PCB. |
| Industrial Wireless Sensor Transmitter | Smart Card Reader IC Power |
|
Use Scenario: LoRaWAN node operating in remote locations with wide-temperature outdoor deployment (-40 °C to +85 °C ambient). IC Role / Device Role / Timing Role: Primary 1.5 V regulator for ultra-low-power MCU and sub-GHz transceiver, controlled by host MCU GPIO. Use Value: –40 °C to +125 °C junction rating ensures reliability; <1 µA shutdown current enables 10+ year battery life in periodic transmit mode. |
Use Scenario: Contactless smart card reader in point-of-sale terminal, requiring fast, glitch-free 1.5 V ramp for secure element initialization. IC Role / Device Role / Timing Role: Precision 1.5 V supply for ISO/IEC 14443-A/B secure microcontroller, enabled only during card presence detection. Use Value: ±1% output tolerance guarantees compliance with secure IC voltage specs; TTL-compatible INHIBIT allows direct GPIO control without level-shifting. |
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 XC6206P152MR | 1.5 V, 100 mA, 120 mV dropout @ 100 mA, 1 µA IQ, SOT23-3 (no INHIBIT or Bypass pins) | Lacks inhibit control and noise-reduction bypass pin - requires external enable circuitry and higher-noise design margin. | Select when higher output current (100 mA) is needed and board space permits discrete enable logic. |
| ROHM BD05HA5WEFJ-C | 1.5 V, 50 mA, 120 mV dropout @ 50 mA, 25 µA IQ, 40 µVRMS noise, HTSOP-J8 package | Larger 8-pin HTSOP-J8 footprint, no dedicated bypass pin, higher dropout limits low-VIN use cases. | Prefer when thermal dissipation >1 W is required and PCB area allows larger package; avoid for coin-cell systems. |
Compared with XC6206P152MR and BD05HA5WEFJ-C, the LD2982BM15R uniquely combines sub-10 mV dropout, <1 µA shutdown, and integrated bypass noise reduction in SOT23-5L - making it optimal for miniaturized, battery-critical, low-noise applications where pin count and headroom are constrained.
Availability
LD2982BM15R is available at Aetrix Electronics and suitable for wearable health monitors, portable audio DACs, industrial wireless sensors, and smart card readers requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LD2982BM15R 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 belongs to ST's high-precision, ultra-low-noise LDO family targeting portable and battery-operated equipment where power efficiency, noise integrity, and small form factor are primary design constraints.
FAQ
What is the minimum input voltage required for regulation at 1.5 V output?
The LD2982BM15R maintains regulation with input as low as 1.507 V due to its 7 mV dropout at 1 mA load. At 50 mA, dropout rises to 120 mV, requiring minimum input of 1.62 V. Input must remain ≥2.5 V for full specification compliance per datasheet absolute maximum ratings.
Can the INHIBIT pin be left unconnected?
No - the INHIBIT pin has no internal pull-up or pull-down. Leaving it floating risks undefined output state and potential oscillation. When not used, it must be hard-wired to the IN pin to ensure continuous operation, as specified in Section 6.5 of the datasheet.
Is an external capacitor required on the Bypass pin?
Yes - a 10 nF capacitor between Bypass (Pin 4) and GND is required to achieve the specified 30 µVRMS output noise. Without it, noise increases to ~60 µVRMS. The capacitor must be placed adjacent to the pin with short, low-inductance traces to GND.
Does the LD2982BM15R support reverse-current protection?
Yes - the internal PNP pass transistor lacks an inherent body diode, preventing reverse current flow from OUT to IN when output voltage exceeds input. Reverse current is limited to ~160 µA through internal feedback resistors, confirmed in Section 6.6 and Figure 17 of the datasheet.
LD2982BM15R 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):
- 1.5V
- 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
LD2982BM15R FAQ
1.How can I place an order for LD2982BM15R through Aetrix?
Please submit a Request for Quotation (RFQ) for LD2982BM15R 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 LD2982BM15R reliable?
The price and inventory of LD2982BM15R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD2982BM15R is usually 5 days.
3.What payment methods are accepted for LD2982BM15R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD2982BM15R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD2982BM15R?
LD2982BM15R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD2982BM15R 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 LD2982BM15R?
For technical support, including LD2982BM15R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD2982BM15R requirements.
6.How does Aetrix verify that LD2982BM15R is sourced from the original manufacturer or authorized distributors?
All LD2982BM15R 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 LD2982BM15R meets industry standards.
7.What is the process for return or replacement of LD2982BM15R?
All LD2982BM15R units undergo pre-shipment inspection (PSI). If there is an issue with LD2982BM15R, 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 LD2982BM15R part is unused and in its original packaging.
Return procedure for LD2982BM15R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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