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Texas Instruments LP2985IM5X-3.3
- Part No.:
- LP2985IM5X-3.3
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2985IM5X-3.3.pdf
- Description:
- IC REG LINEAR 3.3V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,070
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Product details
Overview
LP2985IM5X-3.3 from Texas Instruments is a fixed-output, micropower ultra-low-dropout linear regulator (LDO) delivering 150 mA output current with 3.3 V nominal output, 1% accuracy (A-grade), 300 mV typical dropout at full load, and 75 µA quiescent current at 1 mA - designed for battery-powered portable electronics requiring low noise and high efficiency.
For engineers reviewing the LP2985IM5X-3.3 datasheet, LP2985IM5X-3.3 pinout, LP2985IM5X-3.3 application, or LP2985IM5X-3.3 equivalent, key selection criteria include verified 3.3 V output tolerance, SOT-23-5 package compatibility, BYPASS-pin-enabled 30 µVRMS noise performance, shutdown current < 2 µA, and stability with 2.2 µF ceramic output capacitors.
Technical Context
The LP2985IM5X-3.3 uses a vertically integrated PNP (VIP) process to achieve ultra-low dropout and minimal ground current across load range. Its internal reference and feedback loop ensure 1% output voltage accuracy over –40°C to 125°C junction temperature, with line regulation of 0.014%/V and load regulation maintained within ±2.5% up to 150 mA.
It integrates logic-controlled ON/OFF functionality with 1.6 V enable threshold and 0.15 V disable threshold, enabling precise power sequencing. The dedicated BYPASS pin supports external 10 nF capacitor to reduce output noise to 30 µVRMS (300 Hz–50 kHz), while foldback current limiting and thermal shutdown provide robust fault protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±1% (A-grade); ensures stable rail for 3.3 V microcontrollers and RF ICs without external trimming. |
| Max Output Current | 150 mA continuous; sufficient for powering baseband processors, sensors, and low-power FPGAs in portable devices. |
| Dropout Voltage | 350 mV max at 150 mA (–40°C to 125°C); enables operation from single-cell Li-ion (3.0 V min) or 3.6 V supply with margin. |
| Quiescent Current | 75 µA at 1 mA load; minimizes standby power loss in always-on subsystems like real-time clocks or wake-up circuits. |
| Output Noise | 30 µVRMS (300 Hz–50 kHz, with 10 nF BYPASS cap); meets stringent noise requirements for ADC references and RF front-ends. |
| PSRR | 45 dB at 1 kHz; suppresses switching noise from upstream DC-DC converters feeding the LDO input. |
| Shutdown Current | 0.01 µA typical; reduces system-level leakage during deep sleep modes in handheld and IoT applications. |
Pinout & Package
LP2985IM5X-3.3 is housed in a 5-pin SOT-23 package (2.90 mm × 1.60 mm), optimized for space-constrained PCB layouts and compatible with standard pick-and-place assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Input voltage supply | Accepts 2.5 V–16 V input; requires ≥1 µF ceramic decoupling capacitor placed ≤1 cm from pin for stability. |
| GND (Pin 2) | Ground reference | Device substrate connection; must be tied to clean analog ground plane to minimize noise coupling. |
| ON/OFF (Pin 3) | Enable/disable control input | Logic-high (>1.6 V) enables regulator; logic-low (<0.15 V) disables output and reduces IQ to <2 µA. |
| BYPASS (Pin 4) | Noise reduction terminal | Connects to 10 nF capacitor to GND to reduce internal reference noise; omission increases output noise to ~75 µVRMS. |
| OUT (Pin 5) | Regulated output | Delivers 3.3 V ±1%; requires ≥2.2 µF ceramic capacitor with ESR as low as 5 mΩ for unconditional stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 300 mV typical at 150 mA enables use with weak or aging batteries in wearables and medical sensors. |
| Low-noise architecture | 30 µVRMS output noise with BYPASS pin support ensures clean power for precision analog signal chains. |
| Stable with ceramic capacitors | Operates reliably with 2.2 µF/5 mΩ ceramic output caps - eliminates need for larger, costlier tantalum alternatives. |
| Integrated protection | Thermal shutdown and foldback current limiting prevent damage during short-circuit or overload events. |
| Micropower shutdown | Sub-µA shutdown current extends battery life in intermittently active systems such as remote sensors and BLE peripherals. |
Applications
| Cellular Baseband Power | Portable Audio Codec Supply |
|---|---|
Use Scenario: Powers baseband processor and memory in GSM/GPRS feature phones with single Li-ion cell input. IC Role / Device Role / Timing Role: Primary 3.3 V LDO supplying core logic and I/O rails; provides fast transient response to burst-mode processing loads. Use Value: 350 mV max dropout ensures regulation down to 3.65 V input, preserving >90% usable battery capacity; 1% accuracy prevents logic-level violations. | Use Scenario: Supplies low-noise analog and digital rails to stereo audio codecs in Bluetooth headsets. IC Role / Device Role / Timing Role: Dual-rail source (via separate LP2985 variants) for AVDD and DVDD; BYPASS pin reduces jitter-inducing noise on clock domains. Use Value: 30 µVRMS noise directly improves SNR by >2 dB versus standard LDOs; 150 mA headroom supports peak headphone drive currents. |
| Medical Sensor Node | Industrial PLC I/O Module |
Use Scenario: Powers ECG front-end amplifier and low-power MCU in disposable wearable health monitors. IC Role / Device Role / Timing Role: Always-on 3.3 V supply with ON/OFF controlled by MCU wake-up interrupt; maintains RTC and sensor bias during sleep. Use Value: 75 µA quiescent current extends coin-cell battery life to >12 months; shutdown current < 0.01 µA eliminates parasitic drain. | Use Scenario: Provides isolated 3.3 V logic supply for digital I/O isolators and CAN transceivers in factory automation controllers. IC Role / Device Role / Timing Role: Secondary regulated rail derived from 5 V or 12 V system bus; withstands industrial input transients up to 16 V. Use Value: 16 V absolute max input rating allows direct connection to unregulated 12 V rails; overtemperature protection prevents field failures in enclosed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSS721AIDR | Fixed 3.3 V output, 250 mA rating, higher 1.2 µA quiescent current in active mode, no BYPASS pin. | Lacks low-noise capability; unsuitable where <50 µVRMS noise is required for ADC or RF stages. | Choose when higher output current is needed and noise is not critical; verify thermal derating for 150 mA in SOT-23. |
| MCP1700T-3302E/MB | 3.3 V, 250 mA, 1.6 µA quiescent current, no ON/OFF control, no BYPASS pin, different pinout (SOT-23-3). | Not pin-compatible; lacks enable and noise-reduction features; limited to simpler always-on applications. | Select only if board redesign is acceptable and shutdown control or ultra-low noise are unnecessary. |
Compared with LP2985IM5X-3.3, TSS721AIDR offers higher current but sacrifices noise performance and micropower shutdown, while MCP1700T-3302E/MB trades enable functionality and BYPASS noise reduction for lower cost and simpler layout - neither matches the LP2985IM5X-3.3's balanced combination of precision, low noise, and ultra-low IQ in a 5-pin SOT-23.
Availability
LP2985IM5X-3.3 is available at Aetrix Electronics and suitable for cellular baseband power, portable audio codec supply, medical sensor node, and industrial PLC I/O module applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LP2985IM5X-3.3 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, specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in high-reliability silicon design.
The LP2985-N product line was developed specifically for battery-powered portable electronics, emphasizing ultra-low dropout, micropower operation, and low-noise performance in miniature SOT-23 packaging.
FAQ
What is the maximum input voltage rating for LP2985IM5X-3.3?
The LP2985IM5X-3.3 has an absolute maximum input voltage of 16 V, with recommended operating input range from 3.1 V to 16 V. This allows safe operation from unregulated 12 V industrial rails or multi-cell battery sources, provided the dropout margin (VIN – 3.3 V) exceeds the specified 575 mV maximum at full load and temperature extremes.
Does LP2985IM5X-3.3 require an external bypass capacitor for stable operation?
Yes, LP2985IM5X-3.3 requires a minimum 2.2 µF ceramic output capacitor with ESR as low as 5 mΩ for stability across all load conditions. While the BYPASS pin capacitor (typically 10 nF) is optional for noise reduction, omitting the 2.2 µF output capacitor will cause oscillation and functional failure - it is mandatory per TI's design guidelines.
How does the ON/OFF pin function on LP2985IM5X-3.3?
The ON/OFF pin (Pin 3) controls regulator enable state: applying ≥1.6 V enables LP2985IM5X-3.3 with full output regulation; applying ≤0.15 V disables it, reducing quiescent current to <2 µA. The pin must be actively driven - floating or high-impedance states may cause erratic behavior. Tie to VIN if enable control is unused.
What is the output voltage accuracy specification for LP2985IM5X-3.3 over temperature?
LP2985IM5X-3.3 is an A-grade device with ±1% output voltage accuracy at 25°C and ±3.5% over the full –40°C to 125°C junction temperature range at 1–150 mA load. This includes combined effects of line regulation, load regulation, and thermal drift - verified via TI's Statistical Quality Control (SQC) methodology.
Can LP2985IM5X-3.3 be used with tantalum output capacitors?
While LP2985IM5X-3.3 is optimized for ceramic capacitors (2.2 µF, ESR ≥5 mΩ), tantalum capacitors may be used if their ESR falls within the stable region defined in Figure 22 of the datasheet. However, ceramic is strongly preferred due to superior ESR stability over temperature, smaller footprint, and absence of surge-current failure risks inherent to tantalum.
LP2985IM5X-3.3 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):
- 3.3V
- 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-3.3 FAQ
1.How can I place an order for LP2985IM5X-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2985IM5X-3.3 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-3.3 reliable?
The price and inventory of LP2985IM5X-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2985IM5X-3.3 is usually 5 days.
3.What payment methods are accepted for LP2985IM5X-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2985IM5X-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2985IM5X-3.3?
LP2985IM5X-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2985IM5X-3.3 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-3.3?
For technical support, including LP2985IM5X-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2985IM5X-3.3 requirements.
6.How does Aetrix verify that LP2985IM5X-3.3 is sourced from the original manufacturer or authorized distributors?
All LP2985IM5X-3.3 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-3.3 meets industry standards.
7.What is the process for return or replacement of LP2985IM5X-3.3?
All LP2985IM5X-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LP2985IM5X-3.3, 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-3.3 part is unused and in its original packaging.
Return procedure for LP2985IM5X-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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