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Texas Instruments LP2985IM5X-3.1/NOPB
- Part No.:
- LP2985IM5X-3.1/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2985IM5X-3.1/NOPB.pdf
- Description:
- IC REG LINEAR 3.1V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,209
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Product details
Overview
LP2985IM5X-3.1/NOPB from Texas Instruments is a micropower, ultra-low-dropout linear regulator delivering 150 mA output current with 3.1 V fixed output voltage, 300 mV typical dropout at full load, 1% output voltage accuracy (A-grade), and 30 µVRMS output noise (300 Hz–50 kHz) when using a 10-nF bypass capacitor - designed for battery-powered portable electronics requiring stable low-noise bias.
For engineers reviewing the LP2985IM5X-3.1/NOPB datasheet, LP2985IM5X-3.1/NOPB pinout, LP2985IM5X-3.1/NOPB application, or LP2985IM5X-3.1/NOPB equivalent, key selection considerations include its SOT-23-5 package footprint, ON/OFF logic control interface, compatibility with low-ESR ceramic output capacitors (≥2.2 µF, ESR ≥5 mΩ), and shutdown quiescent current < 2 µA.
Technical Context
The LP2985IM5X-3.1/NOPB employs a vertically integrated PNP (VIP) pass transistor architecture enabling ultra-low dropout (≤575 mV max at 150 mA over temperature) and low ground current (75 µA typ. at 1 mA, 850 µA typ. at 150 mA). Its internal reference and error amplifier are optimized for stability with ceramic capacitors down to 5 mΩ ESR.
It integrates active ON/OFF control (logic-high enable, 1.6 V threshold), foldback current limiting (400 mA short-circuit limit), thermal shutdown, and low-noise operation via dedicated BYPASS pin - all in a 2.90 mm × 1.60 mm SOT-23-5 package rated for −40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.1 V ±1% (A-grade) - ensures precise biasing for 3.3 V I/O rails with margin, compatible with 3.3 V logic without level shifting. |
| Max Output Current | 150 mA continuous - sufficient for powering microcontrollers, RF transceivers, or sensor signal chains in compact portable devices. |
| Dropout Voltage | ≤575 mV at 150 mA, −40°C to +125°C - enables operation from single-cell Li-ion (3.0 V min) or 3.3 V supply with headroom. |
| Quiescent Current | 75 µA at 1 mA load; ≤2 µA in shutdown - extends battery life in always-on or duty-cycled applications like wearables. |
| Output Noise | 30 µVRMS (300 Hz–50 kHz) with 10 nF BYPASS cap - meets low-noise requirements for ADC references, audio codecs, and precision analog circuits. |
| PSRR | 45 dB at 1 kHz - suppresses switching noise from upstream DC-DC converters feeding the LDO input. |
| Stability Support | Stable with ceramic COUT ≥2.2 µF and ESR as low as 5 mΩ - eliminates need for bulky tantalum or electrolytic capacitors. |
Pinout & Package
SOT-23-5 package (2.90 mm × 1.60 mm body size), surface-mount, RoHS-compliant, tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Input voltage supply | Accepts 3.1 V to 16 V input; requires ≥1 µF ceramic input capacitor placed within 1 cm of pin for stability and transient response. |
| GND (Pin 2) | Ground reference | Device substrate connection; must be tied to clean analog ground plane to minimize noise coupling into regulated output. |
| ON/OFF (Pin 3) | Enable/disable control | Logic-high (>1.6 V) enables regulation; logic-low (<0.15 V) disables output and reduces quiescent current to <2 µA. |
| BYPASS (Pin 4) | Noise reduction node | Connects to 10 nF ceramic capacitor to GND to reduce internal reference noise - lowers output RMS noise to 30 µV. |
| OUT (Pin 5) | Regulated output | Delivers 3.1 V ±1% at up to 150 mA; requires ≥2.2 µF ceramic output capacitor with ESR ≥5 mΩ for guaranteed stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 300 mV typical at 150 mA load - enables use with weak or aging batteries while maintaining regulation. |
| Low-noise operation | 30 µVRMS output noise with 10 nF BYPASS cap - eliminates need for post-regulation filtering in sensitive analog stages. |
| Shutdown control | <2 µA quiescent current in OFF state - critical for zero-power standby modes in IoT edge nodes and medical sensors. |
| Ceramic-capacitor stability | Validated with 2.2 µF/5 mΩ ceramic COUT - reduces BOM cost, board area, and failure risk vs. tantalum alternatives. |
| Integrated protection | Foldback current limiting (400 mA SC limit) and thermal shutdown - prevents damage during fault conditions without external circuitry. |
Applications
| Cellular Handset Power Rail | Wearable Sensor Node Bias |
|---|---|
|
Use Scenario: Supplying 3.1 V bias to baseband processor I/O and RF front-end circuitry in slim-profile smartphones. IC Role / Device Role / Timing Role: Primary low-noise LDO delivering stable 3.1 V rail independent of battery voltage sag during transmit bursts. Use Value: 45 dB PSRR at 1 kHz rejects switching noise from PMIC DC-DC converters; 30 µVRMS noise prevents RF desensitization. |
Use Scenario: Powering ultra-low-power MCU, MEMS accelerometer, and BLE radio in coin-cell–powered fitness trackers. IC Role / Device Role / Timing Role: Main system regulator with ON/OFF pin synchronized to MCU sleep/wake cycles to minimize average current draw. Use Value: <2 µA shutdown current extends 200 mAh coin-cell life beyond 1 year in duty-cycled operation; 150 mA peak supports BLE burst transmission. |
| Portable Medical Monitor Analog Front-End | Industrial Handheld Scanner Logic Supply |
|
Use Scenario: Providing clean 3.1 V reference and bias for 16-bit SAR ADC, instrumentation amplifier, and thermistor interface. IC Role / Device Role / Timing Role: Low-noise analog supply rail decoupled from digital domains via dedicated BYPASS pin configuration. Use Value: 30 µVRMS noise ensures <0.01% measurement error in 3.1 V full-scale ADC conversions; 1% output accuracy maintains calibration integrity. |
Use Scenario: Regulating 3.1 V for barcode scanner laser driver, CMOS image sensor, and ARM Cortex-M4 core in ruggedized handheld terminals. IC Role / Device Role / Timing Role: Robust main power rail supporting 150 mA pulsed loads during scan activation while surviving automotive-grade temperature cycling. Use Value: −40°C to +125°C operating range and thermal shutdown ensure reliability in uncontrolled environments; 575 mV max dropout sustains regulation during cold cranking dips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, micropower LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSS721AIDBVR | 3.3 V fixed output, 250 mA rating, 170 mV typical dropout, no BYPASS pin - higher current but higher noise (65 µVRMS) and no low-noise mode. | Preferred where higher output current is needed and noise sensitivity is lower (e.g., digital-only rails). | Select TSS721AIDBVR only if 3.3 V (not 3.1 V) output is acceptable and 65 µVRMS noise meets system SNR budget. |
| MCP1700T-3102E/TT | 3.1 V fixed output, 250 mA rating, 600 mV max dropout at 250 mA, no ON/OFF pin - lacks enable control and has higher ground current (2.5 µA shutdown vs. <2 µA). | Suitable for cost-sensitive, non-shutdown applications where PCB space allows larger SOT-23-3 footprint. | Choose MCP1700T-3102E/TT only if enable functionality is unnecessary and 250 mA headroom justifies trade-off in noise (115 µVRMS) and shutdown current. |
Compared with LP2985IM5X-3.1/NOPB, TSS721AIDBVR offers higher current but sacrifices low-noise capability and exact 3.1 V output, while MCP1700T-3102E/TT matches the 3.1 V output but omits ON/OFF control and delivers significantly higher output noise - making LP2985IM5X-3.1/NOPB uniquely suited for noise- and enable-sensitive 3.1 V portable designs.
Availability
LP2985IM5X-3.1/NOPB is available at Aetrix Electronics and suitable for cellular handsets, wearable health monitors, portable medical instruments, and industrial handheld scanners requiring stable component supply with consistent parametric performance across production lots.
Supply support for LP2985IM5X-3.1/NOPB 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, signal chain solutions, and high-reliability components.
The LP2985-N product line was engineered specifically for micropower, ultra-low-noise, ultra-low-dropout regulation in space-constrained battery-powered systems - prioritizing quiescent current, noise, and ceramic-capacitor compatibility over raw current capacity.
FAQ
What is the minimum input voltage required for LP2985IM5X-3.1/NOPB to regulate 3.1 V output?
The LP2985IM5X-3.1/NOPB requires a minimum input voltage of 3.1 V plus its dropout voltage. At 150 mA load and −40°C to +125°C, maximum dropout is 575 mV, so minimum VIN is 3.675 V. At light loads (1 mA), dropout drops to 7 mV, allowing regulation down to ~3.107 V - but design margin should assume worst-case 575 mV.
Can LP2985IM5X-3.1/NOPB operate without the BYPASS capacitor?
Yes, LP2985IM5X-3.1/NOPB functions without the BYPASS capacitor, delivering 3.1 V output with standard performance. However, omitting the 10 nF capacitor increases output noise from 30 µVRMS to approximately 115 µVRMS. The BYPASS pin may be left floating or tied to OUT only if noise is not critical; grounding it disables low-noise mode.
Is LP2985IM5X-3.1/NOPB pin-compatible with other LP2985 variants?
Yes, all LP2985-N variants in the SOT-23-5 (DBV) package share identical pinout: IN (1), GND (2), ON/OFF (3), BYPASS (4), OUT (5). Voltage variants (e.g., LP2985IM5X-2.8/NOPB or LP2985IM5X-5.0/NOPB) are direct replacements for footprint and control interface - only output voltage differs.
What output capacitor ESR range ensures stability for LP2985IM5X-3.1/NOPB?
LP2985IM5X-3.1/NOPB is stable with ceramic output capacitors having ESR as low as 5 mΩ and up to approximately 300 mΩ across 1 mA–150 mA load range. TI's datasheet Figure 22 confirms stability for 2.2 µF X7R ceramics (typical ESR ~10–20 mΩ). Avoid ultralow-ESR polymer or specialty ceramics below 5 mΩ unless validated per application note SLVA392.
Does LP2985IM5X-3.1/NOPB require an input capacitor, and what type is recommended?
Yes, LP2985IM5X-3.1/NOPB requires a minimum 1 µF ceramic input capacitor placed within 1 cm of the IN pin and connected to a clean analog ground. Ceramic (X5R/X7R) is strongly preferred for low ESR and stability; tantalum is permitted only if surge-current rated. No ESR requirement exists for CIN, but capacitance must remain ≥1 µF over full temperature range.
LP2985IM5X-3.1/NOPB 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):
- 3.1V
- 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
LP2985IM5X-3.1/NOPB FAQ
1.How can I place an order for LP2985IM5X-3.1/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2985IM5X-3.1/NOPB 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 LP2985IM5X-3.1/NOPB reliable?
The price and inventory of LP2985IM5X-3.1/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2985IM5X-3.1/NOPB is usually 5 days.
3.What payment methods are accepted for LP2985IM5X-3.1/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2985IM5X-3.1/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2985IM5X-3.1/NOPB?
LP2985IM5X-3.1/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2985IM5X-3.1/NOPB 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 LP2985IM5X-3.1/NOPB?
For technical support, including LP2985IM5X-3.1/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2985IM5X-3.1/NOPB requirements.
6.How does Aetrix verify that LP2985IM5X-3.1/NOPB is sourced from the original manufacturer or authorized distributors?
All LP2985IM5X-3.1/NOPB 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 LP2985IM5X-3.1/NOPB meets industry standards.
7.What is the process for return or replacement of LP2985IM5X-3.1/NOPB?
All LP2985IM5X-3.1/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP2985IM5X-3.1/NOPB, 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 LP2985IM5X-3.1/NOPB part is unused and in its original packaging.
Return procedure for LP2985IM5X-3.1/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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