My Inquiry
My Account
Texas Instruments LP2985A-28DBVRG4
- Part No.:
- LP2985A-28DBVRG4
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2985A-28DBVRG4.pdf
- Description:
- IC REG LINEAR 2.8V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,480
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LP2985A-28DBVRG4 from Texas Instruments is a fixed 2.8V, 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 microcontrollers in battery-powered industrial control modules.
For engineers reviewing the LP2985A-28DBVRG4 datasheet, LP2985A-28DBVRG4 pinout, LP2985A-28DBVRG4 application, or LP2985A-28DBVRG4 equivalent, key selection criteria include dropout voltage at 150mA (≤198mV), shutdown current (1.12µA typ), thermal shutdown threshold (170°C), and compatibility with 2.2µF ceramic output capacitors.
Technical Context
The LP2985A-28DBVRG4 employs a CMOS pass transistor architecture with internal bandgap reference and active feedback control. Its dropout voltage scales linearly with load current due to RDS(ON)-dominated conduction, enabling regulation down to VIN = VOUT + 198mV at full 150mA load.
It integrates UVLO (2.2V rising threshold), thermal shutdown (170°C trip), overcurrent protection, and an active-high ON/OFF pin with internal pulldown for controlled output discharge. The BYPASS pin accepts a 10nF capacitor to reduce reference noise, directly enabling the 30µVRMS specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±0.5% over load and temperature - ensures reliable operation of 2.8V I/O domains in MCUs without external trimming. |
| Max Output Current | 150mA continuous - sufficient to power core logic and peripherals of ultra-low-power microcontrollers like MSP430 or STM32L series. |
| Dropout Voltage | 198mV max at 150mA and 125°C - enables regulation from 3.0V input (e.g., single Li-ion cell after discharge) while maintaining 2.8V output. |
| Ground Pin Current | 890µA max at 150mA and 125°C - defines total supply current including quiescent and load-dependent GND path, critical for battery life calculation. |
| PSRR | 70dB at 1kHz, 40dB at 1MHz - suppresses switching noise from upstream DC/DC converters, reducing need for additional LC filtering stages. |
| Output Noise | 30µVRMS (300Hz–50kHz, 10nF BYPASS) - meets stringent analog sensor and RF front-end power requirements without post-regulation filtering. |
| Operating Temp | –40°C to +125°C junction - supports deployment in automotive under-hood, industrial motor drives, and outdoor equipment environments. |
Pinout & Package
LP2985A-28DBVRG4 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 SMT reflow profiles.
| 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: >1.6V enables regulator; <0.15V disables with internal pulldown for fast output discharge. |
| BYPASS (Pin 4) | Noise reduction node | Connects 10nF capacitor to GND to filter bandgap reference noise, directly enabling 30µVRMS output noise spec. |
| VOUT (Pin 5) | Regulated output | Delivers fixed 2.8V; requires ≥2.2µF ceramic capacitor to GND for stability across temperature and load conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 30µVRMS output noise with 10nF BYPASS cap - eliminates need for secondary RC filters in precision analog signal chains. |
| Ultra-low shutdown current | 1.12µA typical shutdown current - extends battery life in always-on sensor nodes and remote monitoring devices. |
| Stable with small ceramics | Compatible with 2.2µF X7R/X5R ceramic output capacitors - reduces BOM cost and board area vs. larger tantalum or electrolytic caps. |
| Integrated protection | Thermal shutdown (170°C), current limiting (~350mA peak), and UVLO (2.2V rising) - enables robust operation without external fault management circuitry. |
| Soft-start behavior | Internal soft-start minimizes inrush current during enable - prevents input rail droop and avoids triggering upstream supply current limits. |
Applications
| Motor Drive Power Sequencing | Wireless Sensor Node Core Supply |
|---|---|
Use Scenario: Powers MCU, transceiver, and analog front-end in battery-operated industrial wireless sensors deployed in harsh environments. IC Role / Device Role / Timing Role: Primary LDO delivering clean 2.8V to MCU core and RF IC, enabled via host processor GPIO. Use Value: 30µVRMS noise and 70dB PSRR prevent RF desense and ADC quantization errors; 1.12µA shutdown current enables multi-year battery life. |
Use Scenario: Supplies low-power microcontroller and MEMS accelerometer in cordless power tool health-monitoring subsystem. IC Role / Device Role / Timing Role: Fixed-output LDO providing regulated 2.8V rail from buck converter output, with ON/OFF synchronized to tool activity. Use Value: 198mV dropout allows operation down to 3.0V input (partially discharged Li-ion), extending usable runtime per charge cycle. |
| Active Antenna mMIMO Bias Supply | Washer/Dryer Control Board Logic Rail |
Use Scenario: Provides stable bias voltage to low-noise amplifiers and phase shifters in 5G base station active antenna arrays. IC Role / Device Role / Timing Role: Low-noise post-regulator for sensitive RF components, placed close to each amplifier stage. Use Value: 2.2µF ceramic stability and –40°C to +125°C rating support compact, thermally dense RF module designs without derating. |
Use Scenario: Powers microcontroller, display driver, and interface logic on appliance main control board exposed to variable ambient temperatures. IC Role / Device Role / Timing Role: Main 2.8V logic supply, enabled only during active cycles to minimize standby power. Use Value: ±0.5% accuracy ensures consistent I/O voltage margins across temperature; integrated thermal shutdown prevents latch-up during motor surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC7602IDBVR | 2.8V fixed, 150mA, ±1% accuracy, 45µVRMS noise, requires 4.7µF output cap | Higher noise and looser accuracy; lacks BYPASS pin for noise optimization | Acceptable where 45µVRMS noise is tolerable and board space permits larger output capacitor. |
| MCP1703T-2802E/MB | 2.8V fixed, 250mA, ±2% accuracy, 30µVRMS noise, stable with 1µF ceramic | Higher current capability but lower accuracy; no ON/OFF control pin | Preferred when higher load margin is needed and enable functionality is not required. |
Compared with TLC7602IDBVR and MCP1703T-2802E/MB, LP2985A-28DBVRG4 offers superior accuracy (±0.5% vs ±1% or ±2%), integrated enable with pulldown, and lowest system-level noise performance when using its dedicated BYPASS pin - making it optimal for precision analog and RF-sensitive applications.
Availability
LP2985A-28DBVRG4 is available at Aetrix Electronics and suitable for industrial motor drives, wireless sensor networks, active antenna systems, and home appliance control boards requiring stable component supply and long-term manufacturability.
Supply support for LP2985A-28DBVRG4 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 communications markets.
LP2985A-28DBVRG4 belongs to TI's LP2985A low-noise LDO family, engineered specifically for noise-sensitive applications such as RF front-ends, precision data acquisition, and battery-powered portable electronics where high PSRR and ultra-low output noise are critical.
FAQ
What is the maximum input voltage rating for LP2985A-28DBVRG4?
The LP2985A-28DBVRG4 has an absolute maximum continuous input voltage of 18V. Its recommended operating input range is 2.5V to 16V, ensuring safe and stable regulation across wide-input applications such as industrial power rails and automotive accessory circuits. Exceeding 18V may cause permanent damage.
Does LP2985A-28DBVRG4 require an external bypass capacitor?
Yes, LP2985A-28DBVRG4 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 degrades PSRR performance, especially below 100kHz. The capacitor must be placed adjacent to the BYPASS pin with minimal trace length.
Can LP2985A-28DBVRG4 operate with a 2.2µF ceramic output capacitor?
Yes, LP2985A-28DBVRG4 is explicitly characterized and guaranteed stable with a minimum 2.2µF X7R or X5R ceramic output capacitor. This eliminates the need for larger, more expensive tantalum or aluminum electrolytic capacitors and simplifies layout in space-constrained designs.
What is the shutdown current specification for LP2985A-28DBVRG4?
The LP2985A-28DBVRG4 draws 1.12µA typical and 2.75µA maximum shutdown current when the ON/OFF pin is held below 0.15V and VIN = 16V across –40°C to +125°C. This ultra-low quiescent current enables multi-year battery operation in always-on IoT endpoints.
Is LP2985A-28DBVRG4 pin-compatible with earlier LP2985 variants?
Yes, LP2985A-28DBVRG4 uses the same 5-pin SOT-23 (DBV) package and identical pinout as legacy LP2985 devices. However, it incorporates improved specifications including ±0.5% accuracy, lower dropout, and enhanced PSRR - allowing direct replacement where tighter regulation and lower noise are beneficial.
LP2985A-28DBVRG4 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
LP2985A-28DBVRG4 FAQ
1.How can I place an order for LP2985A-28DBVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2985A-28DBVRG4 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-28DBVRG4 reliable?
The price and inventory of LP2985A-28DBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2985A-28DBVRG4 is usually 5 days.
3.What payment methods are accepted for LP2985A-28DBVRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2985A-28DBVRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2985A-28DBVRG4?
LP2985A-28DBVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2985A-28DBVRG4 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-28DBVRG4?
For technical support, including LP2985A-28DBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2985A-28DBVRG4 requirements.
6.How does Aetrix verify that LP2985A-28DBVRG4 is sourced from the original manufacturer or authorized distributors?
All LP2985A-28DBVRG4 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-28DBVRG4 meets industry standards.
7.What is the process for return or replacement of LP2985A-28DBVRG4?
All LP2985A-28DBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with LP2985A-28DBVRG4, 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-28DBVRG4 part is unused and in its original packaging.
Return procedure for LP2985A-28DBVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP2985A-28DBVRG4 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
