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Texas Instruments LP2985AIM5-2.8/NOPB
- Part No.:
- LP2985AIM5-2.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2985AIM5-2.8/NOPB.pdf
- Description:
- IC REG LINEAR 2.8V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,063
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Product details
Overview
LP2985AIM5-2.8/NOPB from Texas Instruments is a micropower, ultra-low-dropout linear regulator delivering 150 mA output current with 2.8 V fixed output voltage, 300 mV typical dropout at full load, 1% output voltage accuracy (A-grade), and 30 µVRMS output noise (30 kHz BW) when using a 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 LP2985AIM5-2.8/NOPB datasheet, LP2985AIM5-2.8/NOPB pinout, LP2985AIM5-2.8/NOPB application, or LP2985AIM5-2.8/NOPB equivalent, key selection criteria include dropout performance at 150 mA, shutdown quiescent current (< 1 µA), stability with ceramic capacitors down to 5 mΩ ESR, ON/OFF logic control interface, and thermal protection behavior in compact SOT-23 packaging.
Technical Context
The LP2985AIM5-2.8/NOPB employs a vertically integrated PNP (VIP) pass transistor architecture enabling ultra-low dropout and minimal ground current across load range. Its internal reference and error amplifier are optimized for low noise and high PSRR-45 dB at 1 kHz-while the dedicated BYPASS pin allows external filtering of reference noise.
Operation is enabled via TTL/CMOS-compatible ON/OFF pin (logic-high ≥1.6 V), with shutdown current ≤2 µA. The device integrates foldback current limiting and thermal shutdown, and remains stable with 2.2 µF ceramic output capacitors having ESR as low as 5 mΩ-eliminating need for tantalum or aluminum electrolytic types.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8 V ±1% (A-grade) - ensures precise rail generation without external feedback components. |
| Max Output Current | 150 mA continuous - supports moderate-power microcontrollers, RF modules, and analog sensors. |
| Dropout Voltage | 300 mV typical at 150 mA - enables operation from single Li-ion (3.0 V min) or two NiMH cells with margin. |
| Quiescent Current | 75 µA at 1 mA load; 850 µA at 150 mA - minimizes battery drain in always-on and intermittent-use systems. |
| Shutdown Current | < 1 µA typical - extends shelf life and standby time in portable devices with enable control. |
| 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. |
| Operating Temp | −40°C to +125°C junction - qualified for industrial and extended-temperature embedded applications. |
Pinout & Package
LP2985AIM5-2.8/NOPB is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Input voltage supply | Accepts 2.5 V to 16 V input; requires ≥1 µF ceramic decoupling within 1 cm of pin. |
| GND (Pin 2) | Ground reference | Device substrate connection; must be tied to clean analog ground plane for noise integrity. |
| ON/OFF (Pin 3) | Enable/disable control | Logic-high ≥1.6 V enables regulation; logic-low ≤0.15 V disables output and reduces IQ to <1 µA. |
| BYPASS (Pin 4) | Noise reduction node | Connects to GND via 10-nF ceramic capacitor to reduce reference noise and achieve 30 µVRMS output noise. |
| OUT (Pin 5) | Regulated output | Delivers stable 2.8 V; requires ≥2.2 µF ceramic output capacitor with ESR ≥5 mΩ for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 300 mV typical at 150 mA load - enables efficient use of aging or partially discharged batteries. |
| Low-noise operation | 30 µVRMS output noise with 10-nF BYPASS cap - suitable for ADC references, RF ICs, and audio circuitry. |
| Stability with ceramic caps | Validated with 2.2 µF output capacitor and ESR as low as 5 mΩ - eliminates ESR-dependent instability and cost of tantalum parts. |
| Integrated protection | Foldback current limiting and thermal shutdown - prevents damage during short-circuit or overload conditions without external circuitry. |
| Micro-power shutdown | <1 µA quiescent current in disable mode - critical for long-term battery backup and IoT endpoint sleep states. |
| High accuracy over temp | ±2.5% total output error (−40°C to +125°C) - maintains system timing and sensor calibration across environmental extremes. |
Applications
| Cellular Handset Baseband | Wearable Health Sensor Hub |
|---|---|
Use Scenario: Powering baseband processor core and memory in GSM/UMTS handsets operating from single-cell Li-ion battery. IC Role / Device Role / Timing Role: Primary 2.8 V LDO supplying digital logic domain with fast transient response and low noise to prevent bit errors. Use Value: 300 mV dropout preserves usable battery life down to 3.0 V; 1% accuracy ensures reliable CPU clock generation and memory interface timing. | Use Scenario: Regulating power for optical heart-rate sensor, accelerometer, and BLE radio in compact wrist-worn devices. IC Role / Device Role / Timing Role: Low-noise, enable-controlled 2.8 V supply enabling synchronized sensor sampling and low-power radio bursts. Use Value: 30 µVRMS noise prevents signal corruption in photodiode amplifiers; <1 µA shutdown current extends multi-week battery life. |
| Industrial PLC I/O Module | Portable Medical Glucose Meter |
Use Scenario: Providing isolated 2.8 V rail for analog front-end and microcontroller in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Precision voltage source for ADC reference and MCU core, operating across −40°C to +85°C ambient. Use Value: ±2.5% output tolerance over temperature ensures consistent measurement accuracy; thermal shutdown protects against enclosure overheating. | Use Scenario: Supplying electrochemical sensor interface and LCD driver in handheld diagnostic equipment powered by coin cell or AAA batteries. IC Role / Device Role / Timing Role: Micropower LDO enabling on-demand sensor activation while maintaining ultra-low standby current. Use Value: 75 µA quiescent current at 1 mA load maximizes battery runtime; 2.2 µF ceramic output cap simplifies layout and improves reliability vs. electrolytics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, enable-controlled LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV70728PDQNR | Lower max output current (200 mA), higher PSRR (68 dB @ 1 kHz), no BYPASS pin - uses internal noise reduction. | Preferred where higher PSRR is critical and external bypass cap is undesirable; less suitable for ultra-low-noise analog sensing. | Select TLV70728PDQNR if board space is constrained and PSRR >60 dB required; avoid if 30 µVRMS noise floor is mandatory. |
| MCP1700T-2802E/TT | 100 mA max output, no enable pin, 6 µA quiescent current - lacks ON/OFF control and high-current capability. | Suitable only for always-on, low-current applications like RTC backup; cannot replace LP2985AIM5-2.8/NOPB in enable-driven systems. | Choose MCP1700T-2802E/TT only for cost-sensitive, non-enable designs under 100 mA; not a functional substitute for LP2985AIM5-2.8/NOPB. |
Compared with TLV70728PDQNR and MCP1700T-2802E/TT, the LP2985AIM5-2.8/NOPB uniquely balances 150 mA delivery, sub-1 µA shutdown, 30 µVRMS noise via BYPASS, and robust thermal/current protection - making it optimal for portable systems demanding both performance and reliability in SOT-23 form factor.
Availability
LP2985AIM5-2.8/NOPB is available at Aetrix Electronics and suitable for cellular handset power management, wearable sensor hubs, industrial I/O modules, portable medical diagnostics, and battery-backed real-time clock circuits requiring stable component supply with full traceability and lifecycle support.
Supply support for LP2985AIM5-2.8/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 specializing in analog, embedded processing, and connectivity technologies, with decades of leadership in power management innovation.
The LP2985-N product line was engineered specifically for ultra-low-noise, micropower, battery-operated portable electronics - emphasizing dropout efficiency, ceramic-capacitor compatibility, and integrated protection in miniature SOT-23 packages.
FAQ
What is the minimum input voltage required for LP2985AIM5-2.8/NOPB to regulate 2.8 V at 150 mA?
The LP2985AIM5-2.8/NOPB requires a minimum input voltage of 3.375 V to maintain regulation at 150 mA load, based on its maximum dropout voltage of 575 mV over temperature (−40°C to +125°C). At room temperature, typical dropout is 300 mV, so 3.1 V input suffices. Input must remain ≥2.5 V for survival, but regulation is not guaranteed below VOUT + VDO(max).
Does LP2985AIM5-2.8/NOPB require an external bypass capacitor to achieve its specified 30 µVRMS noise performance?
Yes, LP2985AIM5-2.8/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 due to unfiltered internal reference noise. The BYPASS pin is not optional for low-noise applications.
Can LP2985AIM5-2.8/NOPB operate with a 1-µF output capacitor instead of the recommended 2.2 µF?
No - LP2985AIM5-2.8/NOPB requires a minimum 2.2 µF ceramic output capacitor for guaranteed stability across all load and temperature conditions. Using 1 µF risks oscillation or poor transient response, especially at higher loads or elevated temperatures. The 2.2 µF value is validated for ESR as low as 5 mΩ and must be maintained over the full operating range.
What happens to LP2985AIM5-2.8/NOPB when the ON/OFF pin is left floating?
If the ON/OFF pin of LP2985AIM5-2.8/NOPB is left floating, the device may power up unpredictably or fail to start due to insufficient drive level. TI specifies that the ON/OFF pin must be actively terminated - either pulled high to VIN (for always-on operation) or driven by a logic source. Floating violates the recommended operating condition and can cause erratic enable behavior or increased ground current.
Is LP2985AIM5-2.8/NOPB compatible with ceramic input capacitors, and what is the minimum required value?
Yes, LP2985AIM5-2.8/NOPB is fully compatible with ceramic input capacitors. A minimum 1 µF ceramic capacitor is required between IN and GND, placed within 1 cm of the IN pin and connected to a clean analog ground. Larger values improve ripple rejection and transient response, and there is no upper limit - unlike output capacitors, input ESR has no stability constraints.
LP2985AIM5-2.8/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):
- 2.8V
- 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
LP2985AIM5-2.8/NOPB FAQ
1.How can I place an order for LP2985AIM5-2.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2985AIM5-2.8/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 LP2985AIM5-2.8/NOPB reliable?
The price and inventory of LP2985AIM5-2.8/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2985AIM5-2.8/NOPB is usually 5 days.
3.What payment methods are accepted for LP2985AIM5-2.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2985AIM5-2.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2985AIM5-2.8/NOPB?
LP2985AIM5-2.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2985AIM5-2.8/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 LP2985AIM5-2.8/NOPB?
For technical support, including LP2985AIM5-2.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2985AIM5-2.8/NOPB requirements.
6.How does Aetrix verify that LP2985AIM5-2.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LP2985AIM5-2.8/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 LP2985AIM5-2.8/NOPB meets industry standards.
7.What is the process for return or replacement of LP2985AIM5-2.8/NOPB?
All LP2985AIM5-2.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP2985AIM5-2.8/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 LP2985AIM5-2.8/NOPB part is unused and in its original packaging.
Return procedure for LP2985AIM5-2.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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