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Texas Instruments LP2985-30DBVTG4
- Part No.:
- LP2985-30DBVTG4
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2985-30DBVTG4.pdf
- Description:
- IC REG LINEAR 3V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,577
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Product details
Overview
LP2985-30DBVTG4 from Texas Instruments is a fixed 3.0V, 150mA low-dropout linear regulator with shutdown control, ±0.5% output accuracy (new chip), 30µVRMS output noise (with 10nF bypass capacitor), and 70dB PSRR at 1kHz - designed for powering noise-sensitive analog circuits and low-voltage microcontrollers in battery-powered industrial systems.
For engineers reviewing the LP2985-30DBVTG4 datasheet, LP2985-30DBVTG4 pinout, LP2985-30DBVTG4 application, or LP2985-30DBVTG4 equivalent, key selection criteria include dropout voltage at 150mA (≤198mV), stable operation with 2.2µF ceramic output capacitors, shutdown current of 1.12µA (typ), and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The LP2985-30DBVTG4 implements a CMOS-based LDO architecture with internal bandgap reference, error amplifier, and P-channel pass transistor. Its low-noise performance relies on a dedicated BYPASS pin connected to a 10nF capacitor to filter reference voltage noise.
It integrates active-high enable logic (ON/OFF pin), thermal shutdown (170°C trip), current limiting (~350mA peak), and internal soft-start to limit inrush current. The device operates across –40°C to +125°C junction temperature and supports input voltages from 2.5V to 16V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0V ±0.5% over load and temperature - ensures stable supply for 3.3V-tolerant MCUs and precision analog sensors without external feedback. |
| Max Output Current | 150mA continuous - sufficient for powering core logic, RF front-end bias, or small FPGA I/O banks. |
| Dropout Voltage | 198mV max at 150mA and 125°C - enables regulation from 3.2V input, critical for single-cell Li-ion or 3.3V rail post-regulation. |
| Ground Pin Current | 890µA max at 150mA and 125°C - defines total system quiescent power; enables accurate battery-life estimation in portable designs. |
| PSRR | 70dB at 1kHz, 40dB at 1MHz - suppresses switching noise from upstream DC/DC converters, reducing need for additional LC filtering. |
| Output Noise | 30µVRMS (300Hz–50kHz, 10nF BYPASS) - meets stringent requirements for ADC references, PLL VCO supplies, and audio codecs. |
| Shutdown Current | 1.12µA typical at VIN = 16V and –40°C to 85°C - preserves battery energy during deep-sleep modes in IoT edge nodes. |
Pinout & Package
LP2985-30DBVTG4 is housed in a 5-pin SOT-23 (DBV) package measuring 2.9mm × 2.8mm - optimized for high-density layouts and compatible with standard pick-and-place equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply | Accepts 2.5V–16V; requires ≥1µF ceramic capacitor to GND for stability and transient response. |
| GND | Ground reference | Common return path for input, output, and internal circuitry; must be low-impedance connection to minimize noise coupling. |
| ON/OFF | Enable control | Active-high logic input; drives high (>1.6V) to enable regulator, low (<0.15V) to disable with internal pulldown - no external pull-down needed. |
| BYPASS | Noise reduction node | Connects to 10nF capacitor to GND to reduce reference voltage noise; directly determines 30µVRMS output noise performance. |
| VOUT | Regulated output | Delivers fixed 3.0V; stable with ≥2.2µF ceramic capacitor (ESR ≤1Ω); effective capacitance must remain >1µF after derating. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 30µVRMS output noise with 10nF BYPASS cap - enables clean power for high-resolution ADCs and RF synthesizers. |
| Ultra-low shutdown current | 1.12µA typical - extends battery life in always-on sensor nodes and remote monitoring devices. |
| Stable with small ceramics | Supports 2.2µF X7R/X5R MLCC output capacitors - eliminates need for larger, less reliable tantalum or electrolytic caps. |
| High PSRR at high frequency | 40dB rejection at 1MHz - mitigates noise from fast-switching buck converters feeding the LDO input. |
| Integrated protection | Thermal shutdown (170°C), current limiting (~350mA), and UVLO (2.2V rising) - ensures robust operation under fault conditions. |
Applications
| Washer and Dryer Control Boards | Land Mobile Radio Transceivers |
|---|---|
Use Scenario: Powering MCU, display driver, and motor control logic in appliance main control units operating in thermally variable environments. IC Role / Device Role / Timing Role: Primary 3.0V LDO supplying core logic and interface peripherals from a 5V or 12V intermediate rail. Use Value: ±0.5% accuracy maintains timing margin for UART/SPI communication; 125°C rating ensures reliability near heating elements. |
Use Scenario: Providing clean 3.0V bias to RF front-end ICs, PLLs, and audio codecs in handheld two-way radios. IC Role / Device Role / Timing Role: Low-noise post-regulator for sensitive analog signal chains downstream of switching power supplies. Use Value: 30µVRMS noise and 70dB PSRR prevent AM/FM demodulation distortion and adjacent-channel interference. |
| Active Antenna mMIMO Systems | Cordless Power Tool Motor Controllers |
Use Scenario: Delivering stable 3.0V to beamforming ASICs and phase shifters in compact 5G base station antenna modules. IC Role / Device Role / Timing Role: Local point-of-load regulator for distributed RF ICs requiring minimal board area and thermal footprint. Use Value: SOT-23-5 package and 178.6°C/W RθJA enable thermal management in sealed, fanless enclosures. |
Use Scenario: Supplying 3.0V to motor gate drivers, Hall-effect sensors, and battery fuel gauges in high-vibration cordless tools. IC Role / Device Role / Timing Role: Shutdown-capable LDO enabling rapid power cycling between tool activation and standby states. Use Value: 1.12µA shutdown current minimizes self-discharge during storage; 150mA output supports multi-sensor fusion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSS721AIDR | Fixed 3.3V output; higher 250mA rating; 65µVRMS noise; requires 4.7µF output cap. | Targeted at industrial RS-485 transceivers; lacks BYPASS pin for ultra-low-noise tuning. | Select when 3.3V (not 3.0V) is required and higher current headroom is needed, but noise sensitivity is moderate. |
| MCP1700T-3002E/MB | 3.0V output; 250mA rating; 115µVRMS noise; 6µA quiescent current; SOT-23-3 package (no ON/OFF or BYPASS). | Optimized for cost-sensitive, low-power sensor nodes; no enable or noise-reduction features. | Choose for simple always-on 3.0V rails where shutdown control and sub-50µVRMS noise are not required. |
Compared with TSS721AIDR and MCP1700T-3002E/MB, LP2985-30DBVTG4 uniquely delivers 3.0V ±0.5% accuracy, 30µVRMS noise via BYPASS pin, and 1.12µA shutdown - making it optimal for high-fidelity analog and battery-critical systems where precision, noise, and ultra-low sleep current are jointly essential.
Availability
LP2985-30DBVTG4 is available at Aetrix Electronics and suitable for washer/dryer control boards, land mobile radio transceivers, and active antenna mMIMO systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LP2985-30DBVTG4 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 and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LP2985 product line was engineered specifically for low-noise, low-quiescent-current regulation in space- and power-constrained applications - emphasizing precision output accuracy, wide input range, and robust thermal performance across extended temperature ranges.
FAQ
What is the output voltage tolerance of the LP2985-30DBVTG4 across temperature and load?
The LP2985-30DBVTG4 guarantees ±0.5% output voltage accuracy over full load (1mA–150mA) and temperature (–40°C to +125°C). This tight tolerance ensures reliable operation of 3.0V-tolerant microcontrollers and analog components without external trimming or calibration - a key differentiator from legacy LP2985 variants with ±1.5% tolerance.
Can the LP2985-30DBVTG4 operate stably with a 2.2µF ceramic output capacitor?
Yes, the LP2985-30DBVTG4 is explicitly characterized and specified for stability with 2.2µF ceramic capacitors (X7R/X5R), provided ESR remains ≤1Ω. This capability eliminates reliance on larger, less reliable tantalum capacitors and simplifies layout - unlike earlier LDO generations requiring ≥4.7µF output capacitance.
What is the typical shutdown current of the LP2985-30DBVTG4, and how is it measured?
The LP2985-30DBVTG4 exhibits 1.12µA typical shutdown current when the ON/OFF pin is held below 0.15V and VIN = 16V, tested across –40°C to +85°C. This value reflects total ground pin current in disabled state and is critical for estimating battery leakage in always-off IoT endpoints.
How does the BYPASS pin on the LP2985-30DBVTG4 reduce output noise?
The BYPASS pin on the LP2985-30DBVTG4 connects directly to the internal bandgap reference node. Adding a 10nF capacitor from BYPASS to GND filters reference voltage noise, lowering integrated output noise to 30µVRMS (300Hz–50kHz). Omitting this capacitor increases noise to ~120µVRMS - confirming its essential role in low-noise design.
Does the LP2985-30DBVTG4 include thermal protection, and what is its trip threshold?
Yes, the LP2985-30DBVTG4 incorporates thermal shutdown with a nominal trip threshold of 170°C (junction temperature) and automatic recovery at ~150°C. This protection activates under sustained overload or poor PCB thermal design, preventing permanent damage while allowing safe restart once temperature falls - a feature confirmed in the device's functional block diagram and electrical characteristics table.
LP2985-30DBVTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- 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):
- 0.58V @ 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
LP2985-30DBVTG4 FAQ
1.How can I place an order for LP2985-30DBVTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2985-30DBVTG4 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 LP2985-30DBVTG4 reliable?
The price and inventory of LP2985-30DBVTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2985-30DBVTG4 is usually 5 days.
3.What payment methods are accepted for LP2985-30DBVTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2985-30DBVTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2985-30DBVTG4?
LP2985-30DBVTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2985-30DBVTG4 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 LP2985-30DBVTG4?
For technical support, including LP2985-30DBVTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2985-30DBVTG4 requirements.
6.How does Aetrix verify that LP2985-30DBVTG4 is sourced from the original manufacturer or authorized distributors?
All LP2985-30DBVTG4 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 LP2985-30DBVTG4 meets industry standards.
7.What is the process for return or replacement of LP2985-30DBVTG4?
All LP2985-30DBVTG4 units undergo pre-shipment inspection (PSI). If there is an issue with LP2985-30DBVTG4, 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 LP2985-30DBVTG4 part is unused and in its original packaging.
Return procedure for LP2985-30DBVTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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