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Texas Instruments LP2981-50DBVRG4
- Part No.:
- LP2981-50DBVRG4
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2981-50DBVRG4.pdf
- Description:
- IC REG LINEAR 5V 100MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,550
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Product details
Overview
LP2981-50DBVRG4 from Texas Instruments is a 5.0 V fixed-output, ultra-low dropout linear regulator with 100 mA output capability, ±1.25% output voltage tolerance (standard grade), 200 mV typical dropout at full load, and active-low shutdown control via the ON/OFF pin - used for precision power regulation in battery-powered audio systems and portable instrumentation.
For engineers reviewing the LP2981-50DBVRG4 datasheet, LP2981-50DBVRG4 pinout, LP2981-50DBVRG4 application, or LP2981-50DBVRG4 equivalent, key selection criteria include dropout performance at light-to-full load, shutdown current (0.01 µA), thermal protection behavior, and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The LP2981-50DBVRG4 employs a vertical PNP pass transistor architecture enabling ultra-low dropout (7 mV at 1 mA, 200 mV at 100 mA) and low ground current (600 µA typical at full load). Its internal reference is trimmed to 1.23 V, feeding an error amplifier that drives the pass element to maintain regulated 5.0 V output.
It integrates overcurrent and thermal shutdown protection, supports reverse-input-output voltage mitigation via external Schottky diode, and requires output capacitor ESR matching per load current (e.g., ≥1.2 Ω at 100 mA for 5 V output) to ensure stability - ceramic capacitors require series resistors to meet minimum ESR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1.25% (25°C, 1–100 mA load); ensures stable rail for analog audio stages and microcontroller I/O. |
| Dropout Voltage | 200 mV typical at 100 mA; enables operation from 5.2 V input when battery voltage sags, preserving system uptime. |
| Quiescent Current | 600 µA typical at 100 mA; minimizes standby power loss in always-on sensor nodes. |
| Shutdown Current | 0.01 µA typical; reduces system-level leakage to sub-nA levels during deep sleep modes. |
| Operating Temperature | −40°C to +125°C junction range; supports deployment in automotive cabin electronics and industrial motor controllers. |
| Ripple Rejection | 63 dB at 1 kHz; suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Noise (RMS) | 160 µV (300 Hz–50 kHz); meets low-noise requirements for microphone preamps and ADC reference supplies. |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm max height, surface-mount, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Input supply connection | Accepts 2.2 V to 16 V; must exceed VOUT by ≥200 mV for regulation; internal parasitic diode anode ties to VOUT. |
| 2 - GND | Power ground reference | Low-impedance return path for load and quiescent current; must be tied to clean analog ground plane. |
| 3 - ON/OFF | Active-low enable control | Pull ≤0.3 V to disable (0.01 µA IQ); pull ≥1.6 V to enable; requires active termination - tie to VIN if unused. |
| 4 - NC | No-connect terminal | Internally unconnected; must remain floating - no trace, pad, or component attached. |
| 5 - VOUT | Regulated output | Delivers 5.0 V ±1.25%; requires ≥3.3 µF output capacitor with specified ESR; cathode of internal PNP diode. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 200 mV at 100 mA enables single-cell Li-ion (3.0–4.2 V) to power 5 V logic with external boost or dual-supply architecture. |
| Low ground current | 600 µA at full load reduces total power dissipation vs. lateral PNP regulators - critical for thermal-limited SOT-23 designs. |
| Integrated protection | Thermal shutdown and foldback current limiting prevent damage during short-circuit events without external circuitry. |
| Stable with low-ESR caps | Supports tantalum and aluminum electrolytic outputs; ceramic use requires ≥1 Ω series resistor to meet stability ESR window. |
| Reverse voltage immunity | Internal PNP diode structure necessitates external Schottky (anode to VOUT) if output may exceed VIN - prevents SCR latch-up. |
Applications
| Smart Meter Power Management | Portable Audio DAC Supply |
|---|---|
Use Scenario: Regulating 5 V rail for metrology ADC, real-time clock, and RF transceiver in battery-backed smart electricity meters. IC Role / Device Role / Timing Role: Primary low-noise post-regulator delivering stable 5 V from a 3.3 V buck converter or coin-cell backup path. Use Value: 160 µV RMS noise and 63 dB PSRR prevent quantization errors in 24-bit metrology ADCs; shutdown mode extends 10-year battery life. |
Use Scenario: Providing clean 5 V bias to high-fidelity stereo DAC and headphone amplifier in Bluetooth speakers. IC Role / Device Role / Timing Role: Low-noise linear post-regulator isolating sensitive analog audio circuitry from noisy digital switching supplies. Use Value: Ultra-low dropout preserves headroom when powered from single Li-ion cell (3.0–4.2 V); 200 mV dropout allows >90% usable battery range. |
| Motor Control Logic Supply | Industrial Sensor Node Core Rail |
Use Scenario: Generating 5 V for microcontroller, gate driver logic, and position encoder interface in servo drives. IC Role / Device Role / Timing Role: Dedicated LDO supplying isolated logic domain, decoupled from high-current motor power stages. Use Value: −40°C to +125°C operation ensures reliability in enclosed motor housings; thermal shutdown prevents fault propagation during stall conditions. |
Use Scenario: Powering ultra-low-power MCU, temperature/humidity sensor, and LoRaWAN transceiver in remote environmental monitors. IC Role / Device Role / Timing Role: Always-on regulator with shutdown control, enabling wake-on-event operation from primary battery. Use Value: 0.01 µA shutdown current extends 10-year field life on AA batteries; 600 µA IQ supports continuous sensing without compromising runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP2981A-50DBVR | ±0.75% output tolerance (A-grade), same pinout, identical electrical specs except tighter initial accuracy. | Better suited for precision analog rails where 5 V ±37.5 mV is required (e.g., reference buffers, calibration circuits). | Select LP2981A-50DBVR when initial accuracy is critical; LP2981-50DBVRG4 remains optimal for cost-sensitive, general-purpose 5 V regulation. |
| MCP1700T-5002E/TT | 250 mA output, 6 µA quiescent current, no shutdown pin, SOT-23-3 package (3-pin, no ON/OFF or NC). | Lacks enable control and has higher dropout (600 mV at 250 mA); suitable only for non-shutdown, higher-current applications. | Choose MCP1700T-5002E/TT only if shutdown is unnecessary and 250 mA load capability justifies trade-offs in dropout and feature set. |
Compared with LP2981A-50DBVR and MCP1700T-5002E/TT, the LP2981-50DBVRG4 uniquely balances 100 mA capability, 0.01 µA shutdown, 200 mV dropout, and SOT-23-5 pin compatibility - making it the preferred choice for space-constrained, battery-aware systems requiring precise enable control and thermal safety.
Availability
LP2981-50DBVRG4 is available at Aetrix Electronics and suitable for smart meter power management, portable audio DAC supply, and motor control logic supply requiring stable component supply across extended production lifecycles.
Supply support for LP2981-50DBVRG4 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
Texas Instruments is a global semiconductor company designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LP2981 family was engineered for ultra-low dropout, low-noise, and low-quiescent-current operation in portable and battery-powered systems - targeting applications where efficiency, thermal margin, and precision regulation are critical.
FAQ
What is the maximum input voltage rating for the LP2981-50DBVRG4?
The LP2981-50DBVRG4 has an absolute maximum input voltage (VIN) of 16 V. Operation above this level risks permanent damage. For reliable long-term use, the recommended maximum is 16 V under all conditions, including transient spikes - design margins should account for input ripple and surge events per IEC 61000-4-5.
Does the LP2981-50DBVRG4 require an external Schottky diode?
Yes - the LP2981-50DBVRG4 contains an internal PNP pass transistor with a parasitic diode (anode to VOUT, cathode to VIN). If VOUT may ever exceed VIN - such as during hot-swap, load-dump, or backup-battery switchover - an external Schottky diode (anode to VOUT) is mandatory to prevent SCR latch-up and device failure.
Can ceramic capacitors be used with the LP2981-50DBVRG4 output?
Ceramic capacitors can be used at the LP2981-50DBVRG4 output only if a ≥1 Ω resistor is placed in series to raise effective ESR into the stability window. The regulator requires minimum ESR (e.g., ≥1.2 Ω at 100 mA for 5 V output); standard 2.2 µF ceramics have ~10–20 mΩ ESR and will cause oscillation without series resistance.
What is the function of Pin 4 (NC) on the LP2981-50DBVRG4?
Pin 4 on the LP2981-50DBVRG4 is a no-connect (NC) terminal - it is not bonded internally and serves no electrical function. It must remain unconnected: no trace, solder mask opening, or component attachment is permitted. Leaving it floating avoids parasitic coupling or unintended current paths.
How does the LP2981-50DBVRG4 behave during thermal shutdown?
When junction temperature exceeds ~150°C, the LP2981-50DBVRG4 activates thermal shutdown: output is disabled, VOUT drops, and quiescent current falls to ~0.01 µA. Once die temperature cools by ~20°C, the device automatically recovers and resumes regulation - no reset or external intervention is needed.
LP2981-50DBVRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.37V @ 100mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 95 µA
- Current - Supply (Max):
- 1.7 mA
- PSRR:
- 63dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LP2981-50DBVRG4 FAQ
1.How can I place an order for LP2981-50DBVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2981-50DBVRG4 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 LP2981-50DBVRG4 reliable?
The price and inventory of LP2981-50DBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2981-50DBVRG4 is usually 5 days.
3.What payment methods are accepted for LP2981-50DBVRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2981-50DBVRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2981-50DBVRG4?
LP2981-50DBVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2981-50DBVRG4 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 LP2981-50DBVRG4?
For technical support, including LP2981-50DBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2981-50DBVRG4 requirements.
6.How does Aetrix verify that LP2981-50DBVRG4 is sourced from the original manufacturer or authorized distributors?
All LP2981-50DBVRG4 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 LP2981-50DBVRG4 meets industry standards.
7.What is the process for return or replacement of LP2981-50DBVRG4?
All LP2981-50DBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with LP2981-50DBVRG4, 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 LP2981-50DBVRG4 part is unused and in its original packaging.
Return procedure for LP2981-50DBVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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