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Texas Instruments LP2985A-50DBVRG4
- Part No.:
- LP2985A-50DBVRG4
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2985A-50DBVRG4.pdf
- Description:
- IC REG LINEAR 5V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,889
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Product details
Overview
LP2985A-50DBVRG4 from Texas Instruments is a 5.0V fixed-output, 150mA low-dropout linear regulator in SOT-23-5 (DBV) package, featuring ±0.5% output accuracy (new chip), 30µVRMS output noise with 10nF bypass capacitor, 70dB PSRR at 1kHz, and shutdown current of 1.12µA. It powers noise-sensitive analog rails in motor control boards and active antenna systems.
For engineers reviewing the LP2985A-50DBVRG4 datasheet, LP2985A-50DBVRG4 pinout, LP2985A-50DBVRG4 application, or LP2985A-50DBVRG4 equivalent, this page delivers verified electrical specs, thermal performance data, enable logic thresholds, dropout behavior across temperature/load, and real-world stability conditions with 2.2µF ceramic output capacitors.
Technical Context
The LP2985A-50DBVRG4 uses a CMOS pass transistor architecture with internal bandgap reference and UVLO (2.2–2.4V rising threshold). Its ON/OFF pin is active-high with 0.72V low-to-high transition and includes internal pulldown for controlled output discharge during disable.
It achieves stable regulation with ≥1µF effective output capacitance (derated 50%), supports up to 16V input, and integrates thermal shutdown (170°C trip), current limiting (300–350mA peak), and soft-start to limit inrush. Dropout is 180–198mV at 150mA and 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±0.5% over load and temperature - ensures stable MCU core voltage under varying conditions |
| Max Output Current | 150mA continuous - sufficient for powering low-power microcontrollers and RF front-end bias rails |
| Dropout Voltage | 180–198mV at 150mA, 25°C - enables operation from 5.2V input when VOUT = 5.0V |
| Ground Pin Current | 765–890µA at 150mA load - defines total system quiescent power consumption |
| PSRR | 70dB at 1kHz, 40dB at 1MHz - suppresses switching noise from upstream DC/DC converters |
| Output Noise | 30µVRMS (300Hz–50kHz, 10nF BYPASS) - meets low-noise requirements for ADC references and PLL supplies |
| Operating Temp | –40°C to +125°C junction - qualified for industrial motor drives and outdoor mMIMO equipment |
Pinout & Package
LP2985A-50DBVRG4 is housed in a 5-pin SOT-23 (DBV) package measuring 2.9mm × 2.8mm, optimized for compact PCB layouts and thermal dissipation via PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input supply | Accepts 2.5V–16V; requires ≥1µF input capacitor to ground for stability and transient response |
| GND (Pin 2) | Power ground | Common return path for input, output, and internal circuitry; must be low-impedance |
| ON/OFF (Pin 3) | Enable control | Active-high logic: >0.72V enables regulator; <0.15V disables with internal pulldown for fast VOUT discharge |
| BYPASS (Pin 4) | Noise reduction node | Connects 10nF capacitor to GND to reduce reference noise and achieve 30µVRMS output noise |
| VOUT (Pin 5) | Regulated output | Delivers 5.0V ±0.5%; requires ≥2.2µF ceramic capacitor (≥1µF effective after derating) to ground for stability |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 30µVRMS output noise with 10nF BYPASS cap - eliminates need for additional post-LDO filtering in precision analog circuits |
| Stable with small ceramics | Guaranteed stability with 2.2µF X7R/X5R MLCC output capacitors - reduces BOM count and board space vs. tantalum solutions |
| High PSRR at high frequency | 40dB rejection at 1MHz - effectively attenuates ripple from 1–2MHz DC/DC converters feeding the LDO input |
| Controlled startup | Internal soft-start limits inrush current - minimizes required input bulk capacitance and avoids voltage droop on shared rails |
| Robust protection | Thermal shutdown (170°C), current limiting (300mA peak), and UVLO (2.2V rising) - prevents damage during fault conditions |
Applications
| Motor Control Board Power | Active mMIMO Antenna Bias |
|---|---|
|
Use Scenario: Powers gate drivers and position-sensing ADCs in cordless power tool motor controllers. IC Role / Device Role / Timing Role: Provides clean, stable 5.0V rail isolated from noisy H-bridge switching transients. Use Value: 70dB PSRR at 1kHz and 30µVRMS noise ensure accurate current sensing and precise PWM timing integrity. |
Use Scenario: Supplies bias voltage to low-noise amplifiers (LNAs) and phase shifters in 5G active antenna arrays. IC Role / Device Role / Timing Role: Delivers ultra-low-noise 5.0V for RF front-end components requiring minimal phase noise degradation. Use Value: 10nF BYPASS capacitor reduces broadband noise to 30µVRMS, preserving EVM and adjacent channel leakage ratio (ACLR). |
| Washer/Dryer Microcontroller Rail | Land Mobile Radio Audio Codec Supply |
|
Use Scenario: Regulates 5.0V for main MCU and touch interface controller in home appliance control panels. IC Role / Device Role / Timing Role: Acts as primary post-regulator after wide-input DC/DC, enabling single-rail system design. Use Value: ±0.5% accuracy over –40°C to +125°C ensures reliable boot and real-time operation across ambient extremes. |
Use Scenario: Supplies clean 5.0V to audio codecs and DSPs in ruggedized land mobile radios operating in vehicular environments. IC Role / Device Role / Timing Role: Filters alternator ripple and battery transients before reaching sensitive audio signal paths. Use Value: 40dB PSRR at 1MHz suppresses engine-switching noise, preventing audible artifacts in voice transmission. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSS721AIDR | 5.0V, 150mA, ±2% accuracy, no BYPASS pin, higher 120µVRMS noise | Lacks low-noise capability; unsuitable for RF or precision analog use | Select only if noise and accuracy requirements are relaxed and BYPASS functionality is unnecessary |
| MCP1700T-5002E/TT | 5.0V, 250mA, ±2% accuracy, 1.6µA IQ, no shutdown, 175mV dropout at 250mA | Higher current but no enable/shutdown; lacks PSRR and noise specs for sensitive loads | Prefer when higher output current is needed and enable control or low-noise performance is not required |
Compared with TSS721AIDR and MCP1700T-5002E/TT, LP2985A-50DBVRG4 uniquely combines ±0.5% accuracy, 30µVRMS noise, 70dB PSRR, and active shutdown in a 5-pin SOT-23 - making it the only choice for noise-critical, thermally demanding, and enable-controlled 5V LDO applications.
Availability
LP2985A-50DBVRG4 is available at Aetrix Electronics and suitable for motor drives and control boards, active antenna systems mMIMO, and land mobile radio designs requiring stable component supply, long-term manufacturability, and guaranteed parametric compliance.
Supply support for LP2985A-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 leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The LP2985A series was designed specifically for cost-sensitive, noise-critical portable and industrial applications requiring high PSRR, low dropout, and robust thermal performance in ultra-small packages.
FAQ
What is the output voltage tolerance of LP2985A-50DBVRG4 across temperature and load?
The LP2985A-50DBVRG4 guarantees ±0.5% output voltage accuracy over full load (0–150mA) and temperature (–40°C to +125°C). This is confirmed in Section 5.5 Electrical Characteristics of the SLVS522S datasheet for the "new chip" variant, distinguishing it from legacy LP2985 versions with ±1.5% tolerance.
Can LP2985A-50DBVRG4 operate stably with a 2.2µF ceramic output capacitor?
Yes - LP2985A-50DBVRG4 is explicitly characterized for stability with 2.2µF ceramic capacitors, as stated in the Features section and Section 5.3 Recommended Operating Conditions. The device requires ≥1µF effective capacitance (accounting for 50% derating), which 2.2µF X7R/X5R MLCCs reliably provide.
What is the shutdown current of LP2985A-50DBVRG4, and how is it measured?
LP2985A-50DBVRG4 draws 1.12µA typical shutdown current when the ON/OFF pin is held below 0.15V and VIN = 16V at –40°C to +85°C (Section 5.5, IGNDR). This ultra-low quiescent draw enables battery-backed systems to maintain multi-year shelf life without significant drain.
How does the BYPASS pin function in LP2985A-50DBVRG4, and what capacitor value is recommended?
The BYPASS pin in LP2985A-50DBVRG4 connects to an external capacitor that filters the internal reference voltage. A 10nF capacitor to ground reduces output noise to 30µVRMS (Section 5.5, Vn test condition). Larger values offer diminishing returns; 10nF is the optimum value per TI's characterization.
What is the maximum input voltage rating for LP2985A-50DBVRG4?
LP2985A-50DBVRG4 supports a continuous input voltage range of –0.3V to 18V (Section 5.1 Absolute Maximum Ratings, "new chip"). Its recommended operating input range is 2.5V to 16V (Section 5.3), allowing safe operation from 12V automotive or industrial rails with margin.
LP2985A-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):
- 0.58V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 95 µA
- Current - Supply (Max):
- 2.5 mA
- PSRR:
- 45dB (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
LP2985A-50DBVRG4 FAQ
1.How can I place an order for LP2985A-50DBVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2985A-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 LP2985A-50DBVRG4 reliable?
The price and inventory of LP2985A-50DBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2985A-50DBVRG4 is usually 5 days.
3.What payment methods are accepted for LP2985A-50DBVRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2985A-50DBVRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2985A-50DBVRG4?
LP2985A-50DBVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2985A-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 LP2985A-50DBVRG4?
For technical support, including LP2985A-50DBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2985A-50DBVRG4 requirements.
6.How does Aetrix verify that LP2985A-50DBVRG4 is sourced from the original manufacturer or authorized distributors?
All LP2985A-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 LP2985A-50DBVRG4 meets industry standards.
7.What is the process for return or replacement of LP2985A-50DBVRG4?
All LP2985A-50DBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with LP2985A-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 LP2985A-50DBVRG4 part is unused and in its original packaging.
Return procedure for LP2985A-50DBVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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