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Texas Instruments LP2985A-29DBVR
- Part No.:
- LP2985A-29DBVR
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2985A-29DBVR.pdf
- Description:
- IC REG LINEAR 2.9V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,998
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Product details
Overview
LP2985A-29DBVR from Texas Instruments is a fixed 2.9V, 150mA low-dropout linear regulator in SOT-23-5 (DBV) package, featuring ±0.5% output accuracy over load and temperature, 30µVRMS output noise with 10nF bypass capacitor, and 70dB PSRR at 1kHz. It serves as a precision post-regulator for noise-sensitive analog rails in motor control and RF front-end power domains.
For engineers reviewing the LP2985A-29DBVR datasheet, LP2985A-29DBVR pinout, LP2985A-29DBVR application, or LP2985A-29DBVR equivalent, key selection criteria include dropout voltage at 150mA (180–198mV), shutdown current (1.12µA typ), stability with 2.2µF ceramic output capacitors, and operation across –40°C to +125°C junction temperature.
Technical Context
The LP2985A-29DBVR implements a CMOS-based LDO architecture with an internal bandgap reference (1.2V), error amplifier, and PMOS pass transistor. Its enable logic includes active-high ON/OFF pin with 0.15V low threshold and 1.6V high threshold, plus internal pulldown during disable to actively discharge VOUT.
It integrates UVLO (2.2–2.4V rising), thermal shutdown (170°C trip), current limiting (~350mA peak), and soft-start to limit inrush. The BYPASS pin accepts a 10nF capacitor to reduce reference noise, directly enabling the 30µVRMS noise spec and supporting high-PSRR performance up to 40dB at 1MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 2.9V ±0.5% over load, line, and –40°C to +125°C temperature range - ensures stable MCU core or RF bias rail without external feedback. |
| Max output current | 150mA continuous - sufficient for powering low-power microcontrollers, sensors, or RF ICs without thermal derating in standard PCB layouts. |
| Dropout voltage | 180–198mV at 150mA and 25°C - enables regulation from 3.08V input, critical for single-cell Li-ion or 3.3V system bus applications. |
| Ground pin current | 765–890µA at 150mA load - defines total supply current overhead; enables accurate efficiency estimation in battery-powered designs. |
| Output noise | 30µVRMS (300Hz–50kHz) with 10nF BYPASS capacitor - meets stringent analog/RF supply requirements where switching noise must be suppressed below ADC or PLL thresholds. |
| PSRR | 70dB at 1kHz, 40dB at 1MHz - attenuates ripple from upstream DC/DC converters, reducing need for additional LC filtering stages. |
| Shutdown current | 1.12µA typical at VIN = 16V and TJ ≤ 85°C - supports ultra-low-power sleep modes in portable industrial tools and wireless sensor nodes. |
Pinout & Package
LP2985A-29DBVR is housed in a 5-pin SOT-23 (DBV) package measuring 2.9mm × 2.8mm, optimized for space-constrained PCBs and compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input supply | Accepts 2.5V–16V input; requires ≥1µF ceramic capacitor to GND for stability and transient response. |
| GND (Pin 2) | Power ground | Common return path for input, output, and internal circuitry; must be low-impedance connection to minimize noise coupling. |
| ON/OFF (Pin 3) | Enable control | Active-high logic: ≥0.85V enables regulator; ≤0.15V disables with internal pulldown to discharge VOUT - eliminates need for external bleed resistor. |
| BYPASS (Pin 4) | Noise reduction node | Connects to 10nF capacitor to GND to filter bandgap reference noise - mandatory for achieving 30µVRMS output noise spec. |
| VOUT (Pin 5) | Regulated output | Delivers fixed 2.9V; requires ≥2.2µF ceramic capacitor to GND - stable with ESR ≤1Ω; no tantalum or electrolytic required. |
Key Features
| Feature | Design Value |
|---|---|
| ±0.5% output accuracy (new chip) | Meets tight tolerance requirements of 2.9V I/O or core rails for modern low-voltage MCUs without calibration. |
| Stable with 2.2µF ceramic output capacitor | Reduces BOM count and board area vs. legacy LDOs requiring 4.7µF or higher; eliminates ESR matching constraints. |
| Internal soft-start | Limits inrush current during power-up, minimizing stress on input source and reducing required input capacitance. |
| Active pulldown on disable | Forces VOUT to GND when disabled - prevents floating outputs and unintended wake-up in multi-rail systems. |
| UVLO with 0.13V hysteresis | Prevents erratic startup/shutdown near minimum input voltage; ensures clean power sequencing down to 2.2V input. |
Applications
| Motor Drive Power Supply | RF Front-End Bias Rail |
|---|---|
Use Scenario: Powers gate drivers and current-sense amplifiers in cordless power tool motor controllers. IC Role / Device Role / Timing Role: Low-noise 2.9V LDO supplying analog signal chain and logic interface sections. Use Value: 30µVRMS noise and 70dB PSRR prevent switching noise from DC/DC stage from corrupting current measurement accuracy. |
Use Scenario: Supplies bias voltage to LNAs and mixers in active antenna mMIMO modules. IC Role / Device Role / Timing Role: Precision post-regulator delivering clean 2.9V to RF ICs operating near phase noise limits. Use Value: ±0.5% output accuracy maintains gain flatness across temperature; 180mV dropout enables use with 3.3V system bus. |
| Industrial MCU Core Rail | Smart Appliance Sensor Interface |
Use Scenario: Regulates 2.9V core supply for ARM Cortex-M0+ microcontrollers in washer/dryer main control boards. IC Role / Device Role / Timing Role: Primary LDO for MCU VDD_CORE, supporting deep-sleep mode with 1.12µA shutdown current. Use Value: Thermal shutdown (170°C) and overcurrent protection ensure reliability in enclosed, thermally stressed enclosures. |
Use Scenario: Powers MEMS accelerometers and environmental sensors in land mobile radio handsets. IC Role / Device Role / Timing Role: Low-quiescent LDO providing stable 2.9V to sensor signal conditioning circuitry. Use Value: 750µA ground current at full 150mA load enables predictable battery life modeling in portable two-way radios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2902E/TT | 250mA rated, ±2% accuracy, 17µA IQ, no BYPASS pin, 350mV dropout at 250mA | Higher current capacity but looser accuracy and no low-noise bypass path - unsuitable for RF or precision analog rails | Select only if >150mA load or ultra-low IQ (<20µA) is prioritized over noise and accuracy. |
| TLC7701QDCKR | Adjustable output, ±2% accuracy, 120µA IQ, no shutdown, 400mV dropout at 150mA | Lacks enable and BYPASS functionality; higher dropout limits use with low-input-voltage sources | Choose only for non-critical digital rails where adjustable voltage and absence of enable are acceptable trade-offs. |
Compared with MCP1700T-2902E/TT and TLC7701QDCKR, LP2985A-29DBVR delivers superior noise performance (30µVRMS vs. uncharacterized), tighter accuracy (±0.5% vs. ±2%), and lower dropout (180mV vs. ≥350mV), making it the preferred choice for noise-sensitive, thermally constrained, or precision-regulated applications.
Availability
LP2985A-29DBVR is available at Aetrix Electronics and suitable for motor drives, RF front-ends, industrial MCU cores, and smart appliance sensor interfaces requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LP2985A-29DBVR 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 specializing in analog, embedded processing, and power management technologies, with decades of LDO design expertise and broad automotive/industrial qualification.
The LP2985A series was engineered specifically for cost-sensitive, noise-critical applications demanding high PSRR, low dropout, and robust thermal performance in compact SOT-23 packages - targeting portable industrial tools, RF infrastructure, and home appliance control systems.
FAQ
What is the maximum input voltage rating for LP2985A-29DBVR?
The LP2985A-29DBVR 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 not supported per datasheet specifications and may degrade long-term reliability.
Does LP2985A-29DBVR require an external bypass capacitor?
Yes - LP2985A-29DBVR requires a 10nF 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 stated in the datasheet.
Can LP2985A-29DBVR operate with a 2.2µF ceramic output capacitor?
Yes - LP2985A-29DBVR is explicitly characterized and guaranteed stable with a 2.2µF ceramic output capacitor (X5R/X7R, 10% tolerance), provided its effective capacitance remains ≥1µF after DC bias and temperature derating. No ESR tuning is required.
What is the shutdown current specification for LP2985A-29DBVR?
The LP2985A-29DBVR exhibits a typical shutdown current of 1.12µA at VIN = 16V and junction temperature ≤85°C, with a maximum of 2.75µA across –40°C to +125°C. This enables ultra-low-power sleep states in battery-operated equipment.
Is LP2985A-29DBVR pin-compatible with earlier LP2985 variants?
No - while LP2985A-29DBVR shares the same SOT-23-5 (DBV) package and pinout as legacy LP2985 devices, it incorporates functional enhancements including internal pulldown on disable, improved accuracy (±0.5% vs. ±1.5%), and lower noise. Electrical behavior differs in shutdown and transient response.
LP2985A-29DBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 2.9V
- 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-29DBVR FAQ
1.How can I place an order for LP2985A-29DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2985A-29DBVR 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-29DBVR reliable?
The price and inventory of LP2985A-29DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2985A-29DBVR is usually 5 days.
3.What payment methods are accepted for LP2985A-29DBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2985A-29DBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2985A-29DBVR?
LP2985A-29DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2985A-29DBVR 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-29DBVR?
For technical support, including LP2985A-29DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2985A-29DBVR requirements.
6.How does Aetrix verify that LP2985A-29DBVR is sourced from the original manufacturer or authorized distributors?
All LP2985A-29DBVR 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-29DBVR meets industry standards.
7.What is the process for return or replacement of LP2985A-29DBVR?
All LP2985A-29DBVR units undergo pre-shipment inspection (PSI). If there is an issue with LP2985A-29DBVR, 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-29DBVR part is unused and in its original packaging.
Return procedure for LP2985A-29DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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