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Texas Instruments LP2985A-33DBVTE4
- Part No.:
- LP2985A-33DBVTE4
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2985A-33DBVTE4.pdf
- Description:
- IC REG LINEAR 3.3V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,242
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Product details
Overview
LP2985A-33DBVTE4 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, and 70dB PSRR at 1kHz. It delivers stable power to low-voltage MCUs and RF front-ends in space-constrained industrial and wireless applications.
For engineers reviewing the LP2985A-33DBVTE4 datasheet, LP2985A-33DBVTE4 pinout, LP2985A-33DBVTE4 application, or LP2985A-33DBVTE4 equivalent, key selection criteria include dropout voltage at 150mA (≤198mV), shutdown current (1.12µA typ), thermal shutdown threshold (170°C), stability with 2.2µF ceramic output capacitors, and enable logic compatibility with 0.15V/1.6V thresholds.
Technical Context
The LP2985A-33DBVTE4 uses a CMOS pass transistor architecture with internal bandgap reference and integrated soft-start, enabling controlled inrush current and eliminating external timing components. Its BYPASS pin connects to an external 10nF capacitor to reduce reference noise, directly enabling the 30µVRMS low-noise performance.
It implements active-high enable logic with internal pulldown during shutdown, supports input voltages from 2.5V to 16V, and maintains regulation across –40°C to +125°C junction temperature. Protection includes thermal shutdown (170°C trip, 150°C reset) and foldback current limiting (300–350mA peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±0.5% over load and temperature - ensures tight regulation for 3.3V I/O domains of modern MCUs and RF ICs. |
| Max Output Current | 150mA continuous - sufficient for powering core logic, sensors, and low-power transceivers without thermal derating in DBV package. |
| Dropout Voltage | 198mV max at 150mA and 125°C - enables operation from 3.5V input while maintaining 3.3V output in battery-powered systems. |
| Ground Pin Current | 890µA max at 150mA and 125°C - defines total supply current including quiescent and load-dependent GND path losses. |
| PSRR | 70dB at 1kHz, 40dB at 1MHz - suppresses switching noise from upstream DC/DC converters, reducing need for post-regulator filtering. |
| Output Noise | 30µVRMS (300Hz–50kHz, 10nF BYPASS) - meets stringent noise requirements for ADC references and RF bias rails. |
| Shutdown Current | 1.12µA typical at 16V input and 125°C - enables ultra-low-power standby in always-on subsystems. |
Pinout & Package
LP2985A-33DBVTE4 is housed in a 5-pin SOT-23 (DBV) package measuring 2.9mm × 2.8mm, optimized for high thermal resistance (RθJA = 178.6°C/W) and PCB area efficiency.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input supply connection | Accepts 2.5V–16V input; requires ≥1µF ceramic capacitor to GND for stability and transient response. |
| GND (Pin 2) | Power ground reference | Common return for input/output capacitors and internal regulator circuitry; must be low-impedance. |
| ON/OFF (Pin 3) | Enable control input | Active-high logic: >1.6V enables output; <0.15V disables with internal pulldown to discharge VOUT. |
| BYPASS (Pin 4) | Noise reduction node | Connects 10nF capacitor to GND to filter bandgap reference noise, enabling 30µVRMS output noise performance. |
| VOUT (Pin 5) | Regulated output | Delivers 3.3V ±0.5%; stable with ≥2.2µF ceramic capacitor (ESR ≤1Ω) to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 30µVRMS output noise with 10nF BYPASS capacitor - eliminates need for additional LDO stages in noise-sensitive signal chains. |
| Ultra-low shutdown current | 1.12µA typical - extends battery life in sleep modes of portable tools and IoT edge nodes. |
| Thermal and current protection | Integrated thermal shutdown (170°C) and foldback current limiting (300–350mA) - prevents damage under overload or ambient overheating. |
| Soft-start circuitry | Internal ramp generator - limits inrush current during power-up, reducing stress on input capacitors and upstream supplies. |
| Wide input range | 2.5V to 16V operation - supports direct connection to 3.3V, 5V, 9V, and 12V rails without pre-regulation. |
Applications
| Washer and Dryer Control Board | Land Mobile Radio (LMR) Front-End |
|---|---|
Use Scenario: Powering microcontroller I/O, display driver, and sensor interface circuits in appliance main control units. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying digital logic and analog peripherals with low noise and high PSRR. Use Value: ±0.5% output accuracy ensures reliable MCU boot and sensor ADC reference stability across temperature swings in unventilated enclosures. |
Use Scenario: Biasing RF amplifiers, mixers, and PLL VCOs in handheld two-way radios operating in harsh RF environments. IC Role / Device Role / Timing Role: Low-noise 3.3V supply for sensitive RF signal chain components requiring clean DC bias. Use Value: 30µVRMS noise and 70dB PSRR at 1kHz suppress switching artifacts from DC/DC converters, preserving receiver sensitivity. |
| Active Antenna System (mMIMO) | Cordless Power Tool Motor Controller |
Use Scenario: Providing regulated 3.3V to beamforming ICs and phase shifters in compact 5G base station antenna modules. IC Role / Device Role / Timing Role: Local point-of-load regulator delivering stable voltage to distributed RF ICs on multi-layer PCBs. Use Value: Stability with 2.2µF ceramic capacitors simplifies layout in dense RF sections; 125°C operation supports sealed outdoor enclosures. |
Use Scenario: Supplying gate drivers, MCU cores, and Hall-effect sensors in brushless motor controllers subjected to vibration and thermal cycling. IC Role / Device Role / Timing Role: Robust 3.3V power source with thermal shutdown and wide input range for variable battery voltages (10–18V). Use Value: Dropout voltage ≤198mV at 150mA allows full 3.3V regulation even as Li-ion packs discharge below 3.5V per cell. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSS721AIDR | 3.3V fixed, 250mA, ±2% accuracy, no BYPASS pin, higher IQ (120µA) | Lacks low-noise capability; unsuitable for RF/analog bias where 30µVRMS is required | Select LP2985A-33DBVTE4 when noise, accuracy, or shutdown current are critical; choose TSS721AIDR only for cost-sensitive, non-noise-critical digital rails. |
| MCP1700T-3302E/MB | 3.3V fixed, 250mA, ±2% accuracy, 1.6µA shutdown current, no soft-start | Higher shutdown current and no internal soft-start increase inrush risk on large output caps | LP2985A-33DBVTE4 is preferred for battery-powered systems needing <2µA shutdown and controlled startup; MCP1700T suits simpler, lower-cost applications. |
Compared with TSS721AIDR and MCP1700T-3302E/MB, LP2985A-33DBVTE4 uniquely combines ±0.5% accuracy, 30µVRMS noise, and 1.12µA shutdown in a 5-pin SOT-23 - making it the only option among the three qualified for precision RF bias and ultra-low-power standby in industrial wireless endpoints.
Availability
LP2985A-33DBVTE4 is available at Aetrix Electronics and suitable for washer/dryer control boards, land mobile radio front-ends, and active antenna systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LP2985A-33DBVTE4 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 and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.
The LP2985A series belongs to TI's low-noise, low-IQ LDO portfolio engineered for noise-sensitive applications such as RF bias, precision analog, and battery-powered industrial equipment - emphasizing accuracy, stability, and thermal robustness.
FAQ
What is the maximum input voltage rating for LP2985A-33DBVTE4?
The LP2985A-33DBVTE4 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 guaranteed for regulation or reliability. The device includes UVLO (2.2V rising threshold) to prevent malfunction during brownout conditions.
Does LP2985A-33DBVTE4 require an external bypass capacitor?
Yes, LP2985A-33DBVTE4 requires a 10nF capacitor between the BYPASS pin and GND to achieve its specified 30µVRMS output noise. Omitting this capacitor degrades noise performance significantly. The capacitor must be placed close to the BYPASS pin with short, low-inductance traces to maintain effectiveness across the 300Hz–50kHz bandwidth.
Can LP2985A-33DBVTE4 operate with a 2.2µF ceramic output capacitor?
Yes, LP2985A-33DBVTE4 is explicitly characterized and stable with 2.2µF ceramic output capacitors having ESR ≤1Ω. This eliminates the need for larger tantalum or electrolytic capacitors, reducing board area and improving reliability. For outputs >2.3V, 2.2µF is fully supported per TI's recommended operating conditions.
What is the shutdown current specification for LP2985A-33DBVTE4?
The shutdown current for LP2985A-33DBVTE4 is 1.12µA typical at VIN = 16V and TJ = 125°C, with a maximum of 2.75µA under those conditions. This ultra-low value enables multi-year battery life in always-on monitoring systems. The ON/OFF pin must be driven below 0.15V to activate shutdown mode.
Is LP2985A-33DBVTE4 compatible with lead-free reflow soldering processes?
Yes, LP2985A-33DBVTE4 is RoHS-compliant and rated for standard lead-free reflow profiles, including peak temperatures up to 260°C. Its SOT-23-5 (DBV) package meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), allowing unlimited floor life at ≤30°C/85% RH without dry-pack requirements.
LP2985A-33DBVTE4 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-33DBVTE4 FAQ
1.How can I place an order for LP2985A-33DBVTE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2985A-33DBVTE4 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-33DBVTE4 reliable?
The price and inventory of LP2985A-33DBVTE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2985A-33DBVTE4 is usually 5 days.
3.What payment methods are accepted for LP2985A-33DBVTE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2985A-33DBVTE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2985A-33DBVTE4?
LP2985A-33DBVTE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2985A-33DBVTE4 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-33DBVTE4?
For technical support, including LP2985A-33DBVTE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2985A-33DBVTE4 requirements.
6.How does Aetrix verify that LP2985A-33DBVTE4 is sourced from the original manufacturer or authorized distributors?
All LP2985A-33DBVTE4 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-33DBVTE4 meets industry standards.
7.What is the process for return or replacement of LP2985A-33DBVTE4?
All LP2985A-33DBVTE4 units undergo pre-shipment inspection (PSI). If there is an issue with LP2985A-33DBVTE4, 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-33DBVTE4 part is unused and in its original packaging.
Return procedure for LP2985A-33DBVTE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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