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Texas Instruments LP2985A-25DBVRG4
- Part No.:
- LP2985A-25DBVRG4
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2985A-25DBVRG4.pdf
- Description:
- IC REG LINEAR 2.5V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,660
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Product details
Overview
LP2985A-25DBVRG4 from Texas Instruments is a fixed 2.5V, 150mA low-dropout linear regulator in SOT-23-5 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 - designed for powering noise-sensitive analog circuits and low-voltage MCUs in motor control and wireless infrastructure.
For engineers reviewing the LP2985A-25DBVRG4 datasheet, LP2985A-25DBVRG4 pinout, LP2985A-25DBVRG4 application, or LP2985A-25DBVRG4 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 thresholds (0.15V low / 1.6V high) for reliable power sequencing.
Technical Context
The LP2985A-25DBVRG4 employs a CMOS pass transistor architecture with internal bandgap reference and error amplifier, enabling ultra-low quiescent current (71µA at zero load) and fast transient response. Its integrated soft-start reduces inrush current during startup, minimizing input capacitance requirements.
It features active-high ON/OFF control with internal pulldown when disabled, UVLO (2.2–2.4V rising threshold), and comprehensive protection including overcurrent limiting and thermal shutdown at 170°C. The BYPASS pin accepts a 10nF capacitor to reduce reference noise, directly enabling sub-30µVRMS performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±0.5% over load and temperature - ensures stable supply for 2.5V I/O domains and precision ADC references. |
| Max Output Current | 150mA continuous - sufficient for powering microcontrollers, RF front-end biasing, and sensor signal chains. |
| Dropout Voltage | 198mV max at 150mA and 125°C - enables regulation from 2.7V input, supporting single-cell Li-ion or 3.3V rail post-regulation. |
| Output Noise | 30µVRMS (300Hz–50kHz, 10nF BYPASS) - meets stringent noise requirements for RF synthesizers and audio codecs. |
| PSRR | 70dB at 1kHz, 40dB at 1MHz - effectively suppresses switching noise from upstream DC/DC converters. |
| Quiescent Current | 750µA at 150mA load - balances efficiency and transient performance in always-on subsystems. |
| Shutdown Current | 1.12µA typical - enables ultra-low-power sleep modes in battery-operated devices. |
Pinout & Package
LP2985A-25DBVRG4 is housed in a 5-pin SOT-23 (DBV) package measuring 2.9mm × 2.8mm, optimized for space-constrained PCB layouts and thermal performance (RθJA = 178.6°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply | Accepts 2.5V–16V; requires ≥1µF input capacitor to ground for stability and transient response. |
| GND | Ground reference | Common return path for input, output, and internal circuitry; must be low-impedance for noise control. |
| ON/OFF | Enable control | Active-high logic: ≥1.6V enables regulator; ≤0.15V disables with internal pulldown to discharge VOUT. |
| BYPASS | Noise reduction node | Connects to 10nF capacitor to ground to filter reference voltage noise and achieve 30µVRMS output. |
| VOUT | Regulated output | Delivers fixed 2.5V; stable with ≥2.2µF ceramic capacitor (ESR ≤1Ω) to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 30µVRMS output noise with 10nF BYPASS capacitor - eliminates need for additional LC filtering in sensitive analog rails. |
| Stable with small ceramics | Guaranteed stability using ≥2.2µF X5R/X7R MLCC output capacitors - reduces BOM count and board area vs. tantalum solutions. |
| High PSRR across bandwidth | 70dB at 1kHz and 40dB at 1MHz - provides robust rejection of DC/DC switching artifacts without external compensation. |
| Controlled startup | Internal soft-start limits inrush current - prevents input rail droop and avoids triggering upstream current-limit protection. |
| Robust protection suite | Thermal shutdown (170°C), current limiting, and UVLO (2.2–2.4V) - ensures safe operation under fault and brownout conditions. |
Applications
| Motor Drive Power Supply | Wireless mMIMO Active Antenna |
|---|---|
|
Use Scenario: Powers gate drivers, op-amps, and position sensors in cordless power tools and industrial motor controllers. IC Role / Device Role / Timing Role: Low-noise 2.5V LDO supplying analog front-end and MCU I/O rails. Use Value: 30µVRMS noise and 70dB PSRR prevent PWM-induced coupling into feedback loops and encoder signals. |
Use Scenario: Supplies bias voltage to GaN FET drivers and RF ICs in compact active antenna arrays. IC Role / Device Role / Timing Role: Post-regulator for clean 2.5V local supply in distributed RF transceiver modules. Use Value: Stable 2.5V ±0.5% output ensures consistent gain and linearity across temperature in multi-element beamforming systems. |
| Land Mobile Radio Baseband | Smart Appliance Control Board |
|
Use Scenario: Provides regulated 2.5V for ADCs, DACs, and audio codecs in ruggedized two-way radios. IC Role / Device Role / Timing Role: Precision analog supply LDO with tight initial accuracy and low drift. Use Value: ±0.5% output tolerance over –40°C to +125°C maintains dynamic range and SNR without calibration. |
Use Scenario: Powers microcontroller peripherals and display drivers in washer/dryer main control boards. IC Role / Device Role / Timing Role: General-purpose 2.5V LDO with enable control for subsystem power gating. Use Value: 1.12µA shutdown current extends standby battery life; SOT-23-5 footprint simplifies layout in cost-sensitive white goods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC76025DBVR | 2.5V fixed, ±1% accuracy, 100mA max, 65µVRMS noise, requires 4.7µF output cap | Limited current and higher noise - suitable only for light-load analog sections | Choose if lower cost is critical and load stays below 100mA with relaxed noise specs. |
| MCP1700T-2502E/TT | 2.5V fixed, ±2% accuracy, 250mA max, 115µVRMS noise, stable with 1µF ceramic | Higher noise and looser accuracy - acceptable for digital-only rails but not precision analog | Choose for higher current needs where noise <50µVRMS is not required and ±2% tolerance is acceptable. |
Compared with TLC76025DBVR and MCP1700T-2502E/TT, LP2985A-25DBVRG4 delivers superior noise performance (30µVRMS), tighter accuracy (±0.5%), and proven stability with minimal 2.2µF output capacitance - making it the preferred choice for mixed-signal systems demanding both precision and compactness.
Availability
LP2985A-25DBVRG4 is available at Aetrix Electronics and suitable for motor drives, wireless infrastructure, land mobile radio, and smart appliance control boards requiring stable component supply and long-term production continuity.
Supply support for LP2985A-25DBVRG4 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, with deep expertise in power management ICs for industrial, automotive, and communications markets.
LP2985A-25DBVRG4 belongs to TI's LP2985A family of low-noise, low-IQ LDOs engineered specifically for noise-sensitive applications in portable and fixed infrastructure equipment operating across –40°C to +125°C.
FAQ
What is the maximum input voltage rating for LP2985A-25DBVRG4?
The LP2985A-25DBVRG4 supports a continuous input voltage range of –0.3V to 18V (new chip specification). Operation above 16V is permitted only under absolute maximum conditions and not recommended for sustained use; the recommended operating range remains 2.5V to 16V for reliable regulation and thermal performance.
Does LP2985A-25DBVRG4 require an external bypass capacitor?
Yes - LP2985A-25DBVRG4 requires a 10nF capacitor between the BYPASS pin and GND to achieve its specified 30µVRMS output noise. Omitting this capacitor increases output noise significantly; the device remains functional but does not meet its low-noise performance guarantee without it.
Can LP2985A-25DBVRG4 operate with a 2.2µF ceramic output capacitor?
Yes - LP2985A-25DBVRG4 is explicitly characterized and guaranteed stable with ≥2.2µF ceramic capacitors (X5R/X7R) having ESR ≤1Ω. This eliminates the need for larger or more expensive tantalum capacitors and simplifies design for space-constrained applications.
What is the shutdown current of LP2985A-25DBVRG4 at 125°C?
The shutdown current of LP2985A-25DBVRG4 is specified as 1.12µA typical and 2.75µA maximum at –40°C to +125°C ambient, with VIN = 16V and ON/OFF pin held below 0.15V. This ultra-low value enables true deep-sleep modes in battery-powered systems.
Is LP2985A-25DBVRG4 pin-compatible with earlier LP2985 variants?
Yes - LP2985A-25DBVRG4 uses the same 5-pin SOT-23 (DBV) package and identical pinout as legacy LP2985 devices. However, electrical differences exist: improved accuracy (±0.5% vs ±1.5%), lower noise, and enhanced PSRR make it a functional upgrade - not a drop-in replacement unless system-level validation confirms compatibility with revised specs.
LP2985A-25DBVRG4 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):
- 2.5V
- 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-25DBVRG4 FAQ
1.How can I place an order for LP2985A-25DBVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2985A-25DBVRG4 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-25DBVRG4 reliable?
The price and inventory of LP2985A-25DBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2985A-25DBVRG4 is usually 5 days.
3.What payment methods are accepted for LP2985A-25DBVRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2985A-25DBVRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2985A-25DBVRG4?
LP2985A-25DBVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2985A-25DBVRG4 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-25DBVRG4?
For technical support, including LP2985A-25DBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2985A-25DBVRG4 requirements.
6.How does Aetrix verify that LP2985A-25DBVRG4 is sourced from the original manufacturer or authorized distributors?
All LP2985A-25DBVRG4 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-25DBVRG4 meets industry standards.
7.What is the process for return or replacement of LP2985A-25DBVRG4?
All LP2985A-25DBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with LP2985A-25DBVRG4, 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-25DBVRG4 part is unused and in its original packaging.
Return procedure for LP2985A-25DBVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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