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Texas Instruments LP2985-28DBVRE4
- Part No.:
- LP2985-28DBVRE4
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2985-28DBVRE4.pdf
- Description:
- IC REG LINEAR 2.8V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,241
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Product details
Overview
LP2985-28DBVRE4 from Texas Instruments is a fixed 2.8V, 150mA low-dropout linear regulator in a 5-pin SOT-23 (DBV) package, featuring ±0.5% output accuracy (new chip), 30µVRMS output noise with 10nF bypass capacitor, and 70dB PSRR at 1kHz. It serves as a precision post-regulator for low-voltage microcontrollers and RF power amplifiers in battery-powered industrial systems.
For engineers reviewing the LP2985-28DBVRE4 datasheet, LP2985-28DBVRE4 pinout, LP2985-28DBVRE4 application, or LP2985-28DBVRE4 equivalent, key selection criteria include dropout voltage at 150mA (≤198mV), shutdown current (1.12µA typ), stability with 2.2µF ceramic output capacitors, and thermal shutdown at 170°C - all confirmed for this specific DBV-packaged 2.8V variant.
Technical Context
The LP2985-28DBVRE4 implements a CMOS-based LDO architecture with an internal bandgap reference (1.2V), adjustable via resistor divider feedback in non-fixed variants - though this 2.8V version uses factory-trimmed internal resistors. Its dropout behavior scales linearly with load due to RDS(ON)-dominated pass transistor operation.
It integrates active-high enable logic with hysteresis-free thresholding (0.72V low, 0.85V high), internal soft-start to limit inrush current, and pulldown circuitry on VOUT during disable. UVLO (2.2–2.4V rising) prevents regulation below minimum input, and thermal shutdown (170°C) resets at 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±0.5% over load and temperature - ensures stable core supply for 2.8V I/O domains in MCUs and sensors. |
| Max Output Current | 150mA continuous - sufficient for powering single-core microcontrollers, RF front-end bias, or sensor signal chains. |
| Dropout Voltage | 198mV max at 150mA and 125°C - enables regulation from 3.0V input (e.g., single Li-ion cell after discharge). |
| Ground Pin Current | 890µA max at 150mA and 125°C - defines total system quiescent power loss under full load. |
| PSRR | 70dB at 1kHz, 40dB at 1MHz - suppresses switching noise from upstream DC/DC converters feeding sensitive analog/RF stages. |
| Output Noise | 30µVRMS (300Hz–50kHz, 10nF BYPASS) - meets low-noise requirements for ADC references and PLL VCO supplies. |
| Shutdown Current | 1.12µA typical at 16V input and 125°C - enables ultra-low-power sleep modes in portable equipment. |
| Operating Temp | –40°C to +125°C junction - supports deployment in automotive engine compartments and industrial motor drives. |
Pinout & Package
LP2985-28DBVRE4 is housed in a 5-pin SOT-23 (DBV) package measuring 2.9mm × 2.8mm, optimized for space-constrained PCB layouts and thermally efficient mounting on small copper pads.
| 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 path for input, output, and internal circuitry; must be low-impedance for noise control. |
| ON/OFF (Pin 3) | Enable control input | Active-high logic: >0.85V enables regulator; <0.72V disables with internal VOUT pulldown active. |
| BYPASS (Pin 4) | Noise reduction node | Connects 10nF capacitor to GND to filter reference voltage noise and achieve 30µVRMS output. |
| VOUT (Pin 5) | Regulated output | Delivers 2.8V ±0.5%; stable with ≥2.2µF ceramic output capacitor and ≤1Ω ESR. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 30µVRMS output noise with 10nF BYPASS cap - eliminates need for secondary LC filtering in RF bias rails. |
| Ultra-low shutdown IQ | 1.12µA typical shutdown current - extends battery life in always-on sensor nodes and remote controls. |
| 2.2µF ceramic stability | Stable with 2.2µF X7R/X5R MLCC output caps - reduces BOM cost and board area vs. larger tantalum solutions. |
| Integrated protection | Current limiting, thermal shutdown (170°C), and UVLO (2.2V rising) - enables robust operation without external fault management. |
| Soft-start circuit | Internal ramp limits inrush current - avoids input rail droop and eliminates need for external soft-start RC networks. |
Applications
| Washer and Dryer Control Board | Land Mobile Radio Transceiver |
|---|---|
Use Scenario: Powering MCU, display driver, and motor control logic in appliance mainboard with wide input variation (12V–24V bus). IC Role / Device Role / Timing Role: Primary 2.8V LDO supplying I/O banks and real-time clock circuitry. Use Value: ±0.5% accuracy maintains timing integrity across temperature; 70dB PSRR rejects noise from triac-based heater control. | Use Scenario: Biasing RF power amplifier stages and analog front-end ICs in handheld two-way radios. IC Role / Device Role / Timing Role: Low-noise post-regulator for PA drain voltage and mixer LO generation circuits. Use Value: 30µVRMS noise prevents phase noise degradation; 198mV dropout enables operation from partially discharged Li-ion packs. |
| Active Antenna System mMIMO | Cordless Power Tool Motor Controller |
Use Scenario: Providing clean 2.8V supply to beamforming ICs and low-noise amplifiers in 5G base station antenna modules. IC Role / Device Role / Timing Role: Precision voltage source for analog calibration circuits and ADC reference buffers. Use Value: 0.5% output tolerance ensures consistent gain calibration; 40dB PSRR at 1MHz attenuates switch-mode converter ripple. | Use Scenario: Regulating gate drive and logic supply for BLDC motor controller ICs in cordless drills and saws. IC Role / Device Role / Timing Role: Secondary LDO delivering 2.8V to microcontroller peripherals and Hall-effect sensor interfaces. Use Value: Thermal shutdown (170°C) protects against motor stall conditions; 150mA rating supports multi-sensor integration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSS721AIDR | Higher dropout (250mV @150mA), ±2% accuracy, no BYPASS pin, 65µVRMS noise | Lacks low-noise optimization; suited for non-sensitive digital loads only | Select only if noise and accuracy requirements are relaxed and BYPASS functionality is unnecessary. |
| MCP1700T-2802E/MB | 100mA max output, 6µA quiescent current, ±2% accuracy, no shutdown, no BYPASS | Lower current capability and no enable/shutdown - unsuitable for dynamic power sequencing | Choose only for always-on, low-current sensor nodes where enable control and noise performance are not required. |
Compared with TSS721AIDR and MCP1700T-2802E/MB, LP2985-28DBVRE4 uniquely delivers 150mA output with 30µVRMS noise, ±0.5% accuracy, and active shutdown - making it the sole option among the three qualified for RF bias and precision MCU core supply in thermally demanding environments.
Availability
LP2985-28DBVRE4 is available at Aetrix Electronics and suitable for washer/dryer control boards, land mobile radio transceivers, active antenna systems, and cordless power tool motor controllers requiring stable component supply, long-term manufacturability, and guaranteed parametric compliance.
Supply support for LP2985-28DBVRE4 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 specializing in analog and embedded processing technologies, with leadership in power management ICs and high-reliability industrial components.
The LP2985 series was designed specifically for cost-sensitive, space-constrained applications needing low-noise, low-quiescent-current LDO regulation - targeting portable instrumentation, wireless infrastructure, and automotive body electronics.
FAQ
What is the output voltage tolerance of LP2985-28DBVRE4 over temperature and load?
LP2985-28DBVRE4 guarantees ±0.5% output voltage accuracy across the full operating range of –40°C to +125°C junction temperature and 1mA to 150mA load current. This specification applies specifically to the "new chip" revision referenced in the May 2025 datasheet revision SLVS522S, and is tighter than legacy LP2985 variants.
Does LP2985-28DBVRE4 require an external bypass capacitor, and why?
Yes, LP2985-28DBVRE4 requires a 10nF capacitor between the BYPASS pin and GND to achieve its specified 30µVRMS output noise performance. The BYPASS pin connects directly to the internal bandgap reference; adding this capacitor filters reference noise before it modulates the output, which is critical for RF and precision analog applications.
What is the maximum input voltage rating for LP2985-28DBVRE4?
LP2985-28DBVRE4 supports a continuous input voltage range of –0.3V to 18V, per Absolute Maximum Ratings in the datasheet. However, the Recommended Operating Conditions specify 2.5V to 16V for reliable regulation - exceeding 16V may trigger UVLO or stress internal protection circuits.
Can LP2985-28DBVRE4 operate stably with a 2.2µF ceramic output capacitor?
Yes, LP2985-28DBVRE4 is explicitly characterized and guaranteed stable with a 2.2µF ceramic output capacitor (X7R or X5R dielectric) and ESR ≤1Ω. This is a key differentiator from legacy LDOs requiring larger or higher-ESR capacitors, enabling smaller, lower-cost, and more reliable designs.
What happens to the output when LP2985-28DBVRE4 is disabled via the ON/OFF pin?
When the ON/OFF pin is driven below 0.72V, LP2985-28DBVRE4 disables its pass transistor and activates an internal pulldown circuit on the VOUT pin. This actively discharges the output capacitor, ensuring rapid and controlled VOUT decay - critical for safe power sequencing in multi-rail systems.
LP2985-28DBVRE4 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):
- 2.8V
- 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
LP2985-28DBVRE4 FAQ
1.How can I place an order for LP2985-28DBVRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2985-28DBVRE4 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 LP2985-28DBVRE4 reliable?
The price and inventory of LP2985-28DBVRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2985-28DBVRE4 is usually 5 days.
3.What payment methods are accepted for LP2985-28DBVRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2985-28DBVRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2985-28DBVRE4?
LP2985-28DBVRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2985-28DBVRE4 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 LP2985-28DBVRE4?
For technical support, including LP2985-28DBVRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2985-28DBVRE4 requirements.
6.How does Aetrix verify that LP2985-28DBVRE4 is sourced from the original manufacturer or authorized distributors?
All LP2985-28DBVRE4 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 LP2985-28DBVRE4 meets industry standards.
7.What is the process for return or replacement of LP2985-28DBVRE4?
All LP2985-28DBVRE4 units undergo pre-shipment inspection (PSI). If there is an issue with LP2985-28DBVRE4, 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 LP2985-28DBVRE4 part is unused and in its original packaging.
Return procedure for LP2985-28DBVRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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