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Texas Instruments LP2985A-33DBVRG4
- Part No.:
- LP2985A-33DBVRG4
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2985A-33DBVRG4.pdf
- Description:
- IC REG LINEAR 3.3V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,450
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Product details
Overview
LP2985A-33DBVRG4 from Texas Instruments is a fixed 3.3V, 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 circuits and low-voltage microcontrollers in portable industrial systems.
For engineers reviewing the LP2985A-33DBVRG4 datasheet, LP2985A-33DBVRG4 pinout, LP2985A-33DBVRG4 application, or LP2985A-33DBVRG4 equivalent, key selection criteria include dropout voltage at 150mA (198mV max), thermal shutdown threshold (170°C), stable operation with 2.2µF ceramic output capacitors, and enable logic compatibility with 0.15V low/1.6V high thresholds.
Technical Context
The LP2985A-33DBVRG4 uses a CMOS pass transistor architecture with internal bandgap reference and error amplifier feedback loop. Its low-noise performance relies on dedicated BYPASS pin connection to ground via 10nF capacitor, decoupling the reference voltage node.
It implements active-high enable control with internal pulldown during shutdown, soft-start circuitry to limit inrush current, and integrated protection including thermal shutdown (170°C trip) and current limiting (350mA peak). The device operates across –40°C to +125°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT | Fixed 3.3V output; maintains regulation under load, line, and temperature variation per ±0.5% tolerance spec. |
| Output Current | 150mA continuous; supports power rails for MCUs, sensors, and RF front-end biasing without external heat sinking. |
| Dropout Voltage | 198mV max at 150mA and 125°C; enables operation from 3.5V input while sustaining 3.3V output in battery-powered systems. |
| PSRR | 70dB at 1kHz; suppresses switching noise from upstream DC/DC converters, reducing need for additional filtering stages. |
| Output Noise | 30µVRMS (300Hz–50kHz); meets low-noise requirements for ADC references, PLL VCO supplies, and precision analog signal chains. |
| Shutdown Current | 1.12µA typical; extends battery life in always-on subsystems such as sensor wake-up circuits or real-time clocks. |
| Operating Temp | –40°C to +125°C junction; qualified for under-hood automotive modules, motor drive control boards, and industrial PLC I/O stages. |
Pinout & Package
LP2985A-33DBVRG4 is housed in a 5-pin SOT-23 (DBV) package measuring 2.9mm × 2.8mm, optimized for space-constrained PCB layouts and compatible with standard pick-and-place equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply | Accepts 2.5V–16V input; requires ≥1µF ceramic capacitor to GND for stability and transient response. |
| GND | Ground reference | Common return path for input, output, and bypass networks; must be low-impedance and thermally coupled to PCB copper pour. |
| ON/OFF | Enable control | Active-high logic input; 0.15V low / 1.6V high thresholds; internal pulldown discharges VOUT when disabled. |
| BYPASS | Noise reduction node | Connects 10nF capacitor to GND to filter reference voltage noise; directly determines 30µVRMS output noise performance. |
| VOUT | Regulated output | Delivers stable 3.3V; requires ≥2.2µF ceramic capacitor to GND; ESR ≤1Ω for full stability across temperature. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 30µVRMS output noise with 10nF BYPASS cap enables clean power for ADCs, RF synthesizers, and precision op-amps. |
| Stable with small ceramics | Guaranteed stability using only 2.2µF X7R/X5R MLCC output capacitor-reduces BOM count and board area vs. larger tantalum solutions. |
| High PSRR at audio frequencies | 70dB rejection at 1kHz attenuates ripple from buck converter switching edges, minimizing post-regulator LC filtering. |
| Controlled startup | Internal soft-start limits inrush current during power-up, preventing input rail sag and avoiding false resets in system controllers. |
| Robust protection suite | Thermal shutdown (170°C), current limiting (350mA), and UVLO (2.2V rising) ensure safe operation under fault conditions. |
Applications
| Motor Drive Control Board | Active Antenna mMIMO System |
|---|---|
Use Scenario: Powers FPGA configuration memory, gate driver bias rails, and current-sense amplifiers in compact BLDC motor controllers. IC Role / Device Role / Timing Role: Low-noise 3.3V LDO supplying sensitive analog and digital subcircuits with tight voltage tolerance. Use Value: ±0.5% output accuracy ensures reliable FPGA boot and ADC linearity; 30µVRMS noise prevents quantization errors in current sensing. | Use Scenario: Supplies bias voltage to GaN power amplifiers and phase-shifter ICs in 5G base station active antenna arrays. IC Role / Device Role / Timing Role: Fixed-output LDO delivering stable 3.3V to RF front-end components requiring minimal supply-induced phase noise. Use Value: 70dB PSRR at 1kHz suppresses switching artifacts from nearby DC/DC converters, preserving EVM and ACLR performance. |
| Cordless Power Tool MCU | Washer/Dryer Main Control Board |
Use Scenario: Provides regulated 3.3V to ARM Cortex-M4 MCU, CAN transceiver, and Hall-effect position sensors in battery-operated tools. IC Role / Device Role / Timing Role: Enable-controlled LDO enabling deep-sleep mode with 1.12µA shutdown current to extend Li-ion runtime. Use Value: Active-high ON/OFF with internal pulldown ensures rapid, controlled VOUT discharge during tool idle states. | Use Scenario: Powers microcontroller, display driver, and temperature sensor interface on main control board operating in high-humidity, thermally variable environments. IC Role / Device Role / Timing Role: Industrial-grade LDO supporting –40°C to +125°C junction temperature range with thermal shutdown protection. Use Value: 125°C max operating temperature and 170°C thermal shutdown threshold prevent latch-up during drum heating cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC7L33QDCKRQ1 | ±2% output accuracy, 100mA output, no BYPASS pin, 60µVRMS noise | Lacks low-noise optimization; unsuitable for precision analog or RF biasing | Choose only if cost sensitivity outweighs noise and accuracy requirements |
| MCP1826T-3302E/DB | ±2% accuracy, 300mA output, 50µVRMS noise, requires 4.7µF output cap | Higher output current but higher noise and looser tolerance; less suitable for noise-critical 3.3V rails | Select when higher load current is primary requirement and PSRR/noise specs are secondary |
Compared with TLC7L33QDCKRQ1 and MCP1826T-3302E/DB, LP2985A-33DBVRG4 delivers superior noise performance (30µVRMS), tighter accuracy (±0.5%), and guaranteed stability with smaller 2.2µF output capacitors-making it optimal for space- and noise-constrained embedded systems.
Availability
LP2985A-33DBVRG4 is available at Aetrix Electronics and suitable for motor drives, active antenna systems, cordless power tools, and appliance control boards requiring stable component supply and long-term manufacturability.
Supply support for LP2985A-33DBVRG4 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 headquartered in Dallas, Texas, designing and manufacturing analog and embedded processing chips for industrial, automotive, and consumer markets.
The LP2985A series belongs to TI's precision low-dropout regulator product line, engineered specifically for noise-sensitive applications where high PSRR, low quiescent current, and tight output tolerance are critical-such as RF power amplifiers, medical sensors, and portable instrumentation.
FAQ
What is the maximum input voltage rating for LP2985A-33DBVRG4?
The LP2985A-33DBVRG4 has an absolute maximum continuous input voltage of 18V, with recommended operating range from 2.5V to 16V. Exceeding 18V risks permanent damage; operation above 16V is outside specified performance limits and may degrade PSRR or thermal behavior. Always observe derating guidelines per TI SLVS522S Rev May 2025.
Does LP2985A-33DBVRG4 require an external bypass capacitor?
Yes, LP2985A-33DBVRG4 requires a 10nF ceramic capacitor between the BYPASS pin and GND to achieve its specified 30µVRMS output noise. Omitting this capacitor increases output noise significantly and invalidates the low-noise performance claim. The capacitor must be placed close to the BYPASS pin with short, low-inductance traces.
Can LP2985A-33DBVRG4 operate with a 2.2µF output capacitor?
Yes, LP2985A-33DBVRG4 is explicitly characterized and guaranteed stable with a minimum 2.2µF ceramic output capacitor (X5R/X7R), unlike legacy versions requiring 4.7µF. This reduces solution size and cost. Ensure effective capacitance remains ≥1µF after DC bias and temperature derating per manufacturer recommendations.
What is the shutdown current specification for LP2985A-33DBVRG4?
The LP2985A-33DBVRG4 specifies 1.12µA typical shutdown current at VIN = 16V and TJ = 25°C, with a maximum of 2.75µA over –40°C to +125°C. This ultra-low quiescent draw supports battery-backed subsystems and energy-harvesting applications where standby power budget is critical.
Is LP2985A-33DBVRG4 pin-compatible with earlier LP2985 variants?
Yes, LP2985A-33DBVRG4 uses the same 5-pin SOT-23 (DBV) package and identical pinout as legacy LP2985 devices. However, electrical differences-including ±0.5% accuracy, lower dropout, improved PSRR, and internal pulldown-mean functional substitution requires validation of timing, noise, and enable behavior in the target application.
LP2985A-33DBVRG4 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):
- 3.3V
- 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
LP2985A-33DBVRG4 FAQ
1.How can I place an order for LP2985A-33DBVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2985A-33DBVRG4 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-33DBVRG4 reliable?
The price and inventory of LP2985A-33DBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2985A-33DBVRG4 is usually 5 days.
3.What payment methods are accepted for LP2985A-33DBVRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2985A-33DBVRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2985A-33DBVRG4?
LP2985A-33DBVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2985A-33DBVRG4 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-33DBVRG4?
For technical support, including LP2985A-33DBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2985A-33DBVRG4 requirements.
6.How does Aetrix verify that LP2985A-33DBVRG4 is sourced from the original manufacturer or authorized distributors?
All LP2985A-33DBVRG4 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-33DBVRG4 meets industry standards.
7.What is the process for return or replacement of LP2985A-33DBVRG4?
All LP2985A-33DBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with LP2985A-33DBVRG4, 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-33DBVRG4 part is unused and in its original packaging.
Return procedure for LP2985A-33DBVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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