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Texas Instruments LP2985AIM5X-4.0/NOPB
- Part No.:
- LP2985AIM5X-4.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2985AIM5X-4.0/NOPB.pdf
- Description:
- IC REG LINEAR 4V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,191
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Product details
Overview
LP2985AIM5X-4.0/NOPB from Texas Instruments is a micropower, ultra-low-dropout linear regulator in SOT-23-5 package delivering 150 mA output current with 4.0 V fixed output voltage, 1% initial accuracy, 300 mV typical dropout at full load, and 30 µVRMS output noise (300 Hz–50 kHz) when using a 10-nF bypass capacitor. It serves as a precision, low-noise power supply for battery-powered portable electronics requiring stable voltage under light-to-moderate load.
For engineers reviewing the LP2985AIM5X-4.0/NOPB datasheet, LP2985AIM5X-4.0/NOPB pinout, LP2985AIM5X-4.0/NOPB application, or LP2985AIM5X-4.0/NOPB equivalent, key selection criteria include guaranteed 150 mA output with <1 µA shutdown current, compatibility with ceramic output capacitors down to 5 mΩ ESR, ON/OFF logic control, and thermal/overcurrent protection - all in a 2.9 mm × 1.6 mm surface-mount package.
Technical Context
The LP2985AIM5X-4.0/NOPB uses a vertically integrated PNP (VIP) pass transistor architecture enabling ultra-low dropout (280–575 mV at 150 mA over temperature) and low ground current (850 µA typical at 150 mA). Its internal reference and error amplifier deliver 1% output voltage accuracy across –40°C to 125°C junction temperature and load currents from 1 mA to 150 mA.
It integrates an active ON/OFF control input (logic-high enable), BYPASS pin for noise reduction via external 10-nF capacitor, and foldback current limiting with thermal shutdown. Stability is ensured with ≥2.2 µF ceramic output capacitance and ESR as low as 5 mΩ - eliminating need for tantalum or electrolytic capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.0 V ±1% (A-grade) - ensures precise rail generation for 4.0 V logic or analog circuitry without external feedback. |
| Max Output Current | 150 mA continuous - supports moderate-power microcontrollers, sensors, or RF front-ends in portable devices. |
| Dropout Voltage | 280 mV typ. / 575 mV max at 150 mA - enables operation from single-cell Li-ion (3.0–4.2 V) or 5 V rails with minimal headroom. |
| Quiescent Current | 75 µA typ. at 1 mA / 850 µA typ. at 150 mA - minimizes battery drain in always-on or intermittent-use applications. |
| Shutdown Current | 0.01 µA typ. - reduces system standby power to near-zero when ON/OFF pin is pulled low. |
| Output Noise | 30 µVRMS (300 Hz–50 kHz) with 10-nF BYPASS cap - meets low-noise requirements for ADCs, audio codecs, and RF synthesizers. |
| Ripple Rejection | 45 dB at 1 kHz - suppresses switching noise from upstream DC-DC converters feeding the LDO input. |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body size, 0.95 mm height, gull-wing leads, JEDEC MO-178AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Input voltage supply | Accepts 2.5 V–16 V input; requires ≥1 µF ceramic capacitor to GND within 1 cm for stability and transient response. |
| GND (Pin 2) | Ground reference | Device substrate and return path for IN, OUT, and BYPASS; must connect to low-impedance analog ground plane. |
| 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 filter reference noise and reduce output RMS noise to 30 µV. |
| OUT (Pin 5) | Regulated output | Delivers 4.0 V ±1% at up to 150 mA; requires ≥2.2 µF ceramic capacitor to GND with ESR ≤5 mΩ for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 300 mV typical at 150 mA - extends battery runtime by allowing regulation until cell voltage drops near 4.3 V. |
| Low-noise operation | 30 µVRMS with BYPASS pin - eliminates need for post-LDO filtering in sensitive analog signal chains. |
| Stable with ceramic capacitors | Supports 2.2 µF output cap with 5 mΩ ESR - avoids cost, size, and reliability drawbacks of tantalum/electrolytic caps. |
| Integrated protection | Thermal shutdown + foldback current limiting - prevents damage during short-circuit or overload without external components. |
| Logic-controlled shutdown | ON/OFF pin draws <0.01 µA in disable state - enables system-level power sequencing and deep-sleep modes. |
Applications
| Cellular Phone Baseband | Portable Medical Sensor |
|---|---|
|
Use Scenario: Powers baseband processor core and memory in GSM/UMTS handsets operating from single Li-ion cell. IC Role / Device Role / Timing Role: Primary 4.0 V LDO supplying regulated voltage to digital baseband ICs with tight noise and transient response requirements. Use Value: 30 µVRMS noise and 45 dB PSRR prevent coupling of switching noise into RF receive paths, preserving SNR. |
Use Scenario: Supplies analog front-end and low-power MCU in wearable ECG or pulse oximeter units. IC Role / Device Role / Timing Role: Precision 4.0 V bias source for instrumentation amplifiers and 12-bit ADCs requiring stable reference voltage. Use Value: 1% output accuracy and <1 µA shutdown current extend battery life beyond 7 days per charge in clinical-grade devices. |
| Laptop Subsystem Rail | Digital Camera Image Processor |
|
Use Scenario: Generates auxiliary 4.0 V rail for USB controller, touchpad, or embedded security module in ultrabooks. IC Role / Device Role / Timing Role: Secondary LDO decoupling high-efficiency buck converter output to meet low-noise subsystem requirements. Use Value: 280 mV dropout allows uninterrupted operation during CPU burst loads that cause input rail sag below 4.3 V. |
Use Scenario: Powers CMOS image sensor interface and ISP core in compact digital cameras with flash LED support. IC Role / Device Role / Timing Role: Low-noise, fast-startup 4.0 V regulator for timing-critical image capture pipelines. Use Value: 850 µA ground current at 150 mA and ON/OFF control enable rapid power cycling between capture frames. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, 4.0 V LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV70740PDBVR | 4.0 V fixed, 300 mA output, 250 mV dropout at 300 mA, 40 µVRMS noise, no BYPASS pin, SOT-23-5 | Higher current capability but higher noise and no external noise filtering option | Choose when >150 mA load or smaller dropout at higher current is required; avoid if sub-30 µV noise is mandatory. |
| MCP1703T-4002E/MB | 4.0 V fixed, 250 mA output, 600 mV dropout at 250 mA, 35 µVRMS noise, no ON/OFF pin, SOT-23-5 | Lacks enable control and has higher dropout - limits use in low-headroom battery systems | Choose for cost-sensitive designs where shutdown functionality is unnecessary and input voltage remains ≥4.6 V. |
Compared with TLV70740PDBVR and MCP1703T-4002E/MB, the LP2985AIM5X-4.0/NOPB uniquely combines 1% accuracy, 30 µVRMS noise with BYPASS pin, <1 µA shutdown, and 280 mV dropout - making it optimal for noise-sensitive, battery-constrained portable systems requiring precise 4.0 V regulation.
Availability
LP2985AIM5X-4.0/NOPB is available at Aetrix Electronics and suitable for cellular phones, portable medical sensors, laptop subsystems, and digital camera image processors requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LP2985AIM5X-4.0/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 headquartered in Dallas, Texas, designing and manufacturing analog, embedded processing, and connectivity products for industrial, automotive, and consumer markets.
The LP2985-N product line delivers micropower, ultra-low-dropout, low-noise LDO regulators optimized for battery-powered portable electronics - emphasizing minimal quiescent current, ceramic-capacitor compatibility, and robust protection features in space-constrained packages.
FAQ
What is the maximum input voltage rating for LP2985AIM5X-4.0/NOPB?
The LP2985AIM5X-4.0/NOPB has an absolute maximum input voltage rating of 16 V and a recommended operating input range of 3.1 V to 16 V. Exceeding 16 V may cause permanent damage. For reliable operation at 4.0 V output, minimum input is 3.1 V - ensuring sufficient headroom above the 575 mV maximum dropout at 150 mA and full temperature range.
Does LP2985AIM5X-4.0/NOPB require an external bypass capacitor to achieve its specified 30 µVRMS noise performance?
Yes, the LP2985AIM5X-4.0/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, noise increases significantly. The BYPASS pin directly filters the internal reference, and omitting the capacitor degrades noise performance - critical for ADCs and RF circuits powered by LP2985AIM5X-4.0/NOPB.
Can LP2985AIM5X-4.0/NOPB operate stably with a 2.2 µF ceramic output capacitor?
Yes, LP2985AIM5X-4.0/NOPB is explicitly designed to be stable with ceramic output capacitors as low as 2.2 µF and ESR down to 5 mΩ - confirmed in TI's datasheet Section 8.2.2.1.2 and Figure 22. This eliminates reliance on larger, less reliable tantalum or aluminum electrolytic capacitors and supports miniaturized PCB layouts where LP2985AIM5X-4.0/NOPB is deployed.
What is the shutdown current of LP2985AIM5X-4.0/NOPB when the ON/OFF pin is pulled low?
When the ON/OFF pin voltage is below 0.15 V, the LP2985AIM5X-4.0/NOPB enters shutdown mode with a typical quiescent current of 0.01 µA and a maximum of 2 µA over –40°C to 125°C. This ultra-low shutdown current preserves battery energy in standby or sleep states - a key advantage over alternatives lacking dedicated enable control, such as LP2985AIM5X-4.0/NOPB's design for portable systems.
Is LP2985AIM5X-4.0/NOPB pin-compatible with other members of the LP2985-N family?
Yes, all LP2985-N variants in the SOT-23-5 (DBV) package - including LP2985AIM5X-2.5/NOPB, LP2985AIM5X-3.3/NOPB, and LP2985AIM5X-4.0/NOPB - share identical pinout, footprint, and thermal characteristics. This allows drop-in replacement across output voltages without PCB redesign, provided input voltage, load, and noise requirements remain compatible with the selected variant's specifications.
LP2985AIM5X-4.0/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):
- 4V
- 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
LP2985AIM5X-4.0/NOPB FAQ
1.How can I place an order for LP2985AIM5X-4.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2985AIM5X-4.0/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-4.0/NOPB reliable?
The price and inventory of LP2985AIM5X-4.0/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-4.0/NOPB is usually 5 days.
3.What payment methods are accepted for LP2985AIM5X-4.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2985AIM5X-4.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2985AIM5X-4.0/NOPB?
LP2985AIM5X-4.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2985AIM5X-4.0/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-4.0/NOPB?
For technical support, including LP2985AIM5X-4.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2985AIM5X-4.0/NOPB requirements.
6.How does Aetrix verify that LP2985AIM5X-4.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LP2985AIM5X-4.0/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-4.0/NOPB meets industry standards.
7.What is the process for return or replacement of LP2985AIM5X-4.0/NOPB?
All LP2985AIM5X-4.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP2985AIM5X-4.0/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-4.0/NOPB part is unused and in its original packaging.
Return procedure for LP2985AIM5X-4.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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