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Texas Instruments LP2985AIM5-2.5/NOPB
- Part No.:
- LP2985AIM5-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2985AIM5-2.5/NOPB.pdf
- Description:
- IC REG LINEAR 2.5V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:20,810
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Product details
Overview
LP2985AIM5-2.5/NOPB from Texas Instruments is a micropower, ultra-low-dropout linear regulator delivering 150 mA output current with 2.5 V fixed output voltage, 1% accuracy (A-grade), 300 mV typical dropout at full load, and 30 µVRMS output noise (with 10 nF bypass capacitor). It serves as a precision, low-noise power supply for battery-powered portable electronics requiring stable low-voltage rails.
For engineers reviewing the LP2985AIM5-2.5/NOPB datasheet, LP2985AIM5-2.5/NOPB pinout, LP2985AIM5-2.5/NOPB application, or LP2985AIM5-2.5/NOPB equivalent, key selection criteria include its SOT-23-5 package compatibility, shutdown quiescent current < 1 µA, stability with 5 mΩ ESR ceramic capacitors, and guaranteed 150 mA output across –40°C to 125°C junction temperature.
Technical Context
The LP2985AIM5-2.5/NOPB employs a vertically integrated PNP (VIP) process to achieve ultra-low dropout (280–575 mV at 150 mA over temperature) and low ground current (850 µA typical at 150 mA). Its internal architecture includes a dedicated BYPASS pin for noise filtering and an ON/OFF logic control input enabling < 1 µA shutdown current.
It integrates overtemperature and foldback current limiting protection, operates from 2.5 V to 16 V input, and maintains stability with ceramic output capacitors as low as 2.2 µF and ESR down to 5 mΩ - eliminating need for tantalum or high-ESR alternatives.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±1% (A-grade) - ensures precise rail for 2.5 V logic, ADC references, and RF biasing without external feedback. |
| Max Output Current | 150 mA continuous - supports moderate-power microcontrollers, sensors, and audio codecs in space-constrained designs. |
| Dropout Voltage | 280 mV (typ) / 575 mV (max) at 150 mA - enables operation from single Li-ion (3.0 V min) or dual alkaline cells with minimal headroom loss. |
| Quiescent Current | 75 µA at 1 mA / 850 µA at 150 mA - minimizes battery drain in always-on or low-duty-cycle portable systems. |
| Shutdown Current | 0.01 µA typical - extends shelf life and enables deep-sleep modes in IoT endpoints and wearables. |
| Output Noise | 30 µVRMS (300 Hz–50 kHz, with 10 nF BYPASS cap) - meets stringent noise requirements for analog front-ends and precision signal chains. |
| PSRR | 45 dB at 1 kHz - suppresses switching noise from upstream DC/DC converters in mixed-signal power domains. |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm footprint, surface-mount, thermally enhanced plastic case with exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Input voltage supply | Accepts 2.5–16 V DC; requires ≥1 µF ceramic input capacitor placed within 1 cm of pin for stability and transient response. |
| GND (Pin 2) | Ground reference | Common return path for IN, OUT, and BYPASS; must connect to low-impedance analog ground plane. |
| ON/OFF (Pin 3) | Enable/disable control input | Logic-high (>1.6 V) enables regulation; logic-low (<0.15 V) disables output and reduces IQ to <1 µA - supports host MCU-controlled power sequencing. |
| BYPASS (Pin 4) | Noise reduction terminal | Connects to 10 nF ceramic capacitor to GND to reduce reference noise; omission increases output noise to ~100 µVRMS. |
| OUT (Pin 5) | Regulated output | Delivers stable 2.5 V ±1%; requires ≥2.2 µF ceramic capacitor with ESR ≤5 mΩ for unconditional stability across load and temperature. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 280 mV typical at 150 mA enables use with weak or aging batteries while maintaining regulation. |
| Low-noise architecture | 30 µVRMS output noise with BYPASS pin support meets requirements for precision ADCs and RF synthesizers. |
| Stability with ceramic capacitors | Validated for 2.2 µF output caps with ESR as low as 5 mΩ - eliminates need for costly, bulky tantalum or polymer types. |
| Integrated protection | Foldback current limiting and thermal shutdown prevent damage during short-circuit or overload events without external circuitry. |
| Micro-power shutdown | <1 µA quiescent current in OFF state extends battery life in standby for >1 year in typical coin-cell applications. |
Applications
| Cellular Handset Baseband | Wearable Health Sensor Hub |
|---|---|
|
Use Scenario: Powers baseband processor core and memory I/O in GSM/UMTS handsets operating from single-cell Li-ion (3.0–4.2 V). IC Role / Device Role / Timing Role: Primary 2.5 V LDO supplying digital logic domain with fast load transient response and low noise to prevent bit errors. Use Value: 300 mV dropout allows >90% battery utilization; 1% output accuracy ensures reliable logic-level margin across temperature and aging. |
Use Scenario: Supplies analog front-end (AFE), ECG/PPG sensor bias, and BLE SoC in compact wrist-worn devices. IC Role / Device Role / Timing Role: Low-noise, enable-controlled 2.5 V rail for precision biopotential measurement and RF subsystem sequencing. Use Value: 30 µVRMS noise preserves signal integrity; <1 µA shutdown current enables multi-week battery life in intermittent-sampling mode. |
| Industrial Handheld Scanner | Smart Home Motion Detector |
|
Use Scenario: Provides regulated 2.5 V for CMOS image sensor, laser driver, and ARM Cortex-M MCU in ruggedized barcode scanners. IC Role / Device Role / Timing Role: Main system LDO with ON/OFF control synchronized to scan trigger to minimize average power draw. Use Value: 150 mA capability supports peak laser pulse current; SOT-23-5 footprint fits tight PCB layouts with minimal thermal mass. |
Use Scenario: Powers PIR sensor signal conditioning, ultra-low-power MCU, and Zigbee transceiver in battery-operated occupancy sensors. IC Role / Device Role / Timing Role: Always-on 2.5 V reference rail with periodic ON/OFF activation of RF subsystem during motion detection events. Use Value: 75 µA quiescent current at light load extends AA battery life beyond 2 years; 125°C max junction rating supports enclosed enclosures. |
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 |
|---|---|---|---|
| MCP1700T-2502E/TT | 250 mA output, 6 µA quiescent current (no shutdown), 2% output tolerance, SOT-23-3 (no ON/OFF or BYPASS pins) | Lacks enable and noise-reduction features; suitable only for non-critical, always-on 2.5 V rails with higher current demand. | Choose when board space is extremely limited and shutdown/noise performance is secondary to cost and current headroom. |
| TLS850F2TE/V1 | Automotive-grade AEC-Q100, 500 mA, 35 µA IQ, integrated watchdog, but 3.3 V fixed output only - no 2.5 V variant | Designed for automotive body electronics; incompatible pinout and voltage; requires redesign for 2.5 V systems. | Consider only for new automotive designs requiring 2.5 V - requires custom voltage option request and qualification lead time. |
Compared with MCP1700T-2502E/TT and TLS850F2TE/V1, the LP2985AIM5-2.5/NOPB uniquely combines 2.5 V precision, ON/OFF control, BYPASS-enabled low noise, and SOT-23-5 compatibility - making it optimal for portable consumer and industrial edge devices where size, battery life, and signal integrity are co-constrained.
Availability
LP2985AIM5-2.5/NOPB is available at Aetrix Electronics and suitable for cellular handsets, wearable health monitors, industrial handheld scanners, and smart home motion detectors requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LP2985AIM5-2.5/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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LP2985-N product line delivers micropower, ultra-low-dropout regulators optimized for battery-powered portable devices demanding high accuracy, low noise, and minimal quiescent current in ultra-small packages.
FAQ
What is the minimum input voltage required for LP2985AIM5-2.5/NOPB to maintain regulation?
The LP2985AIM5-2.5/NOPB requires VIN ≥ VOUT + dropout voltage. With a maximum dropout of 575 mV at 150 mA and –40°C to 125°C, the minimum functional input is 3.075 V. However, TI specifies a recommended minimum VIN of 3.1 V to ensure margin across all conditions. Below this, output voltage may fall out of 1% tolerance.
Can LP2985AIM5-2.5/NOPB operate without the BYPASS capacitor?
Yes, LP2985AIM5-2.5/NOPB functions without the BYPASS capacitor, but output noise increases significantly - from 30 µVRMS to approximately 100 µVRMS. The BYPASS pin is optional for noise-critical applications like precision ADCs or RF biasing; omitting it simplifies BOM for less sensitive digital loads.
Is LP2985AIM5-2.5/NOPB compatible with ceramic output capacitors below 2.2 µF?
No. The LP2985AIM5-2.5/NOPB requires a minimum 2.2 µF ceramic output capacitor for guaranteed stability across temperature and load. Using smaller values risks oscillation or poor transient response. Capacitance may be increased without limit, but ESR must remain ≤5 mΩ.
What happens to LP2985AIM5-2.5/NOPB during thermal shutdown?
When junction temperature exceeds ~160°C, LP2985AIM5-2.5/NOPB activates thermal shutdown, disabling the output until die temperature falls by ~20°C. During shutdown, the device draws <1 µA. Repeated cycling indicates inadequate PCB copper area or excessive ambient temperature - thermal design must meet RθJA = 169.0°C/W spec.
Does LP2985AIM5-2.5/NOPB support reverse input-output voltage conditions?
No. The LP2985AIM5-2.5/NOPB contains an inherent IN-to-OUT diode that conducts if VOUT > VIN, potentially damaging the device or downstream circuitry. Reverse voltage protection requires an external series Schottky diode or ideal diode controller - not integrated into LP2985AIM5-2.5/NOPB.
LP2985AIM5-2.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
LP2985AIM5-2.5/NOPB FAQ
1.How can I place an order for LP2985AIM5-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2985AIM5-2.5/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 LP2985AIM5-2.5/NOPB reliable?
The price and inventory of LP2985AIM5-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2985AIM5-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LP2985AIM5-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2985AIM5-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2985AIM5-2.5/NOPB?
LP2985AIM5-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2985AIM5-2.5/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 LP2985AIM5-2.5/NOPB?
For technical support, including LP2985AIM5-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2985AIM5-2.5/NOPB requirements.
6.How does Aetrix verify that LP2985AIM5-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LP2985AIM5-2.5/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 LP2985AIM5-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LP2985AIM5-2.5/NOPB?
All LP2985AIM5-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP2985AIM5-2.5/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 LP2985AIM5-2.5/NOPB part is unused and in its original packaging.
Return procedure for LP2985AIM5-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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