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Texas Instruments LP2985AIM5X-2.9/NOPB
- Part No.:
- LP2985AIM5X-2.9/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2985AIM5X-2.9/NOPB.pdf
- Description:
- IC REG LINEAR 2.9V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,693
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Product details
Overview
LP2985AIM5X-2.9/NOPB from Texas Instruments is a micropower, ultra-low-dropout linear regulator delivering 150 mA output current with 2.9 V fixed output voltage, 300 mV typical dropout at full load, 1% output accuracy (A-grade), and 30 µVRMS output noise (300 Hz–50 kHz) when using a 10 nF bypass capacitor. It operates from 2.5 V to 16 V input and targets battery-powered portable electronics requiring low quiescent current and high PSRR.
For engineers reviewing the LP2985AIM5X-2.9/NOPB datasheet, LP2985AIM5X-2.9/NOPB pinout, LP2985AIM5X-2.9/NOPB application, or LP2985AIM5X-2.9/NOPB equivalent, key selection criteria include dropout performance at 150 mA, shutdown current (<2 µA), stability with ceramic capacitors down to 5 mΩ ESR, and BYPASS-pin-enabled low-noise operation in space-constrained SOT-23-5 designs.
Technical Context
The LP2985AIM5X-2.9/NOPB uses a vertically integrated PNP (VIP) process to achieve ultra-low dropout and minimal ground current - 75 µA at 1 mA load and 850 µA at 150 mA load. Its internal reference and feedback loop ensure 1% output voltage tolerance across –40°C to 125°C junction temperature and full load range.
It integrates logic-controlled enable via the ON/OFF pin (active-high, 1.6 V threshold), foldback current limiting (400 mA short-circuit, 350 mA peak), thermal shutdown, and enhanced stability with ceramic output capacitors as low as 2.2 µF and 5 mΩ ESR - eliminating need for tantalum or aluminum electrolytic types.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.9 V ±1% (A-grade); ensures stable rail for 3.0 V–3.3 V logic without external resistors. |
| Max Output Current | 150 mA continuous; supports microcontrollers, RF transceivers, and sensors in handheld devices. |
| Dropout Voltage | 300 mV typical at 150 mA; enables operation from single Li-ion (3.0 V min) or dual alkaline cells. |
| Quiescent Current | 75 µA at 1 mA; maintains ultra-low standby power for always-on subsystems. |
| Shutdown Current | 0.01 µA typical; extends battery life during deep sleep modes. |
| Output Noise | 30 µVRMS (300 Hz–50 kHz) with 10 nF BYPASS cap; meets noise-sensitive analog/RF supply requirements. |
| PSRR | 45 dB at 1 kHz; suppresses switching noise from upstream DC-DC converters. |
| Input Voltage Range | 2.5 V to 16 V; accommodates wide-input industrial and automotive auxiliary rails. |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm footprint, surface-mount, thermally enhanced plastic body with exposed pad not present (standard SOT-23).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Input voltage supply | Accepts 2.5–16 V; requires ≥1 µF ceramic input capacitor placed within 1 cm of pin for stability. |
| GND (Pin 2) | Ground reference | Common return for IN, OUT, BYPASS, and ON/OFF; must connect to low-impedance analog ground plane. |
| ON/OFF (Pin 3) | Enable control input | Active-high logic: ≥1.6 V enables regulator; ≤0.15 V disables with <2 µA shutdown current. |
| BYPASS (Pin 4) | Noise reduction node | Connects 10 nF ceramic capacitor to GND to reduce output noise to 30 µVRMS. |
| OUT (Pin 5) | Regulated output | Delivers 2.9 V ±1% at up to 150 mA; stable with 2.2 µF ceramic cap and ESR ≥5 mΩ. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 300 mV at 150 mA enables use with marginal input sources like aging batteries or low-headroom DC-DC outputs. |
| Low-noise regulation | 30 µVRMS output noise with BYPASS pin support meets audio codec, ADC, and RF LNA supply requirements. |
| Stability with ceramic caps | Validated for 2.2 µF output capacitance and ESR as low as 5 mΩ - eliminates costly tantalum and simplifies BOM. |
| Thermal & current protection | Integrated foldback current limit (400 mA SC) and thermal shutdown prevent damage during fault conditions. |
| High accuracy over temp | ±2.5% max output error over –40°C to 125°C ensures reliable operation in automotive and industrial environments. |
| Logic-compatible enable | ON/OFF pin accepts standard CMOS/TTL levels - allows direct interfacing with microcontroller GPIOs. |
Applications
| Cellular Phone Baseband | Wearable Health Sensor Hub |
|---|---|
Use Scenario: Powers baseband processor core and memory in GSM/UMTS handsets with intermittent high-current bursts. IC Role / Device Role / Timing Role: Primary 2.9 V LDO supplying digital logic domain; provides fast transient response and low noise during RF transmission. Use Value: 300 mV dropout preserves battery runtime during peak 150 mA loads; 30 µVRMS noise prevents bit errors in high-speed data interfaces. | Use Scenario: Supplies optical heart-rate sensor, accelerometer, and BLE radio in compact fitness trackers. IC Role / Device Role / Timing Role: Always-on 2.9 V rail enabling ultra-low-power sleep mode with <2 µA shutdown current. Use Value: 0.01 µA shutdown current extends coin-cell battery life beyond 12 months; SOT-23-5 footprint fits sub-100 mm² PCB area. |
| Industrial Handheld Scanner | Automotive Cabin Camera Module |
Use Scenario: Regulates power for laser diode driver, image sensor, and MCU in ruggedized barcode scanners. IC Role / Device Role / Timing Role: Main 2.9 V supply with thermal protection ensuring reliability during extended operation in hot warehouses. Use Value: Thermal shutdown and –40°C to 125°C junction rating maintain uptime in uncontrolled ambient environments. | Use Scenario: Provides clean 2.9 V bias to CMOS image sensor and ISP in AEC-Q200-compliant rear-view cameras. IC Role / Device Role / Timing Role: Low-noise analog supply rail decoupled from noisy 5 V system bus via LP2985AIM5X-2.9/NOPB's 45 dB PSRR. Use Value: 45 dB ripple rejection at 1 kHz suppresses switching artifacts from buck converter powering adjacent modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, ultra-LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TCS2102-2.9V | 200 mA output, 250 mV dropout at 150 mA, but only 2% output accuracy and no BYPASS pin. | Lacks noise-reduction capability; unsuitable for RF/analog-sensitive circuits requiring <50 µVRMS. | Choose if higher current and lower dropout outweigh noise and accuracy needs. |
| MCP1702T-2902E/MB | 150 mA, 2.9 V, 6 µA quiescent current, but 600 mV dropout at 150 mA and no enable pin. | No ON/OFF control; cannot support dynamic power gating in battery systems. | Prefer for ultra-low-IQ always-on rails where enable functionality is unnecessary. |
Compared with TCS2102-2.9V and MCP1702T-2902E/MB, the LP2985AIM5X-2.9/NOPB uniquely combines 1% accuracy, BYPASS-enabled 30 µVRMS noise, active enable, and 300 mV dropout - making it optimal for noise-critical, battery-gated portable systems where precision and signal integrity are non-negotiable.
Availability
LP2985AIM5X-2.9/NOPB is available at Aetrix Electronics and suitable for cellular phones, wearable health monitors, industrial handheld scanners, and automotive cabin camera modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LP2985AIM5X-2.9/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 leader designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer markets.
The LP2985-N product line delivers micropower, ultra-low-dropout regulators optimized for battery-powered portable electronics - emphasizing low noise, minimal dropout, and compatibility with miniature ceramic capacitors in space-constrained SOT-23 packages.
FAQ
What is the maximum dropout voltage specification for LP2985AIM5X-2.9/NOPB at 150 mA and full temperature range?
The maximum dropout voltage for LP2985AIM5X-2.9/NOPB is 575 mV at 150 mA load and across the full –40°C to 125°C junction temperature range. This value is specified in the Electrical Characteristics table under "VIN–VO" with test condition "IL = 150 mA, –40°C ≤ TJ ≤ 125°C". It defines the minimum headroom required between input and output to maintain regulation.
Does LP2985AIM5X-2.9/NOPB require an external bypass capacitor to achieve its rated 30 µVRMS output noise?
Yes, LP2985AIM5X-2.9/NOPB achieves 30 µVRMS output noise (300 Hz–50 kHz) only when a 10 nF ceramic capacitor is connected between the BYPASS pin and GND. Without this capacitor, output noise rises significantly - the BYPASS pin directly shunts high-frequency reference noise, and omission degrades noise performance by >2×.
Can LP2985AIM5X-2.9/NOPB operate with a 2.2 µF ceramic output capacitor, and what is the minimum ESR requirement?
Yes, LP2985AIM5X-2.9/NOPB is explicitly designed for stability with a 2.2 µF ceramic output capacitor and supports ESR as low as 5 mΩ. This is confirmed in the "Enhanced Stability" section and "Output Capacitor" design guidelines. Using capacitors below this ESR may cause oscillation; above it risks degraded transient response.
What is the ON/OFF pin logic threshold voltage for enabling LP2985AIM5X-2.9/NOPB, and how much current does it draw?
The ON/OFF pin of LP2985AIM5X-2.9/NOPB enables the regulator when pulled to ≥1.6 V (min) and disables it when ≤0.15 V (max), per the Electrical Characteristics table. Input current on this pin is ≤5 µA at 5 V and ≤0.01 µA when pulled to 0 V - enabling direct drive from low-power microcontroller GPIOs without additional level-shifting.
Is LP2985AIM5X-2.9/NOPB qualified for automotive applications, and what is its operating junction temperature range?
LP2985AIM5X-2.9/NOPB is not AEC-Q200 qualified, but its specified operating junction temperature range is –40°C to 125°C - matching many automotive cabin and infotainment module requirements. For production automotive use, TI recommends verifying qualification status per part number and consulting TI's automotive product roadmap, as LP2985AIM5X-2.9/NOPB itself carries no formal automotive qualification.
LP2985AIM5X-2.9/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):
- 2.9V
- 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 (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LP2985AIM5X-2.9/NOPB FAQ
1.How can I place an order for LP2985AIM5X-2.9/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2985AIM5X-2.9/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 LP2985AIM5X-2.9/NOPB reliable?
The price and inventory of LP2985AIM5X-2.9/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2985AIM5X-2.9/NOPB is usually 5 days.
3.What payment methods are accepted for LP2985AIM5X-2.9/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2985AIM5X-2.9/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2985AIM5X-2.9/NOPB?
LP2985AIM5X-2.9/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2985AIM5X-2.9/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 LP2985AIM5X-2.9/NOPB?
For technical support, including LP2985AIM5X-2.9/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2985AIM5X-2.9/NOPB requirements.
6.How does Aetrix verify that LP2985AIM5X-2.9/NOPB is sourced from the original manufacturer or authorized distributors?
All LP2985AIM5X-2.9/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 LP2985AIM5X-2.9/NOPB meets industry standards.
7.What is the process for return or replacement of LP2985AIM5X-2.9/NOPB?
All LP2985AIM5X-2.9/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP2985AIM5X-2.9/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 LP2985AIM5X-2.9/NOPB part is unused and in its original packaging.
Return procedure for LP2985AIM5X-2.9/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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