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Texas Instruments LP2985IM5-4.0
- Part No.:
- LP2985IM5-4.0
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2985IM5-4.0.pdf
- Description:
- IC REG LINEAR 4V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,164
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Product details
Overview
LP2985IM5-4.0 from Texas Instruments is a micropower, ultra-low-dropout linear regulator delivering 150 mA output current with 4.0 V fixed output voltage, 300 mV typical dropout at full load, 1% output accuracy (A-grade), and <1 µA shutdown quiescent current. It operates from 2.5 V to 16 V input and targets battery-powered portable electronics requiring low noise and high efficiency under tight voltage headroom.
For engineers reviewing the LP2985IM5-4.0 datasheet, LP2985IM5-4.0 pinout, LP2985IM5-4.0 application, or LP2985IM5-4.0 equivalent, key selection considerations include its SOT-23-5 package, BYPASS-pin-enabled 30 µVRMS noise performance, thermal/overcurrent protection, compatibility with 2.2 µF ceramic output capacitors, and ON/OFF logic-controlled enable functionality.
Technical Context
The LP2985IM5-4.0 uses 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 reference and error amplifier deliver 1% output voltage accuracy across –40°C to 125°C junction temperature.
It integrates an ON/OFF control input with 1.6 V turn-on threshold and <0.8 µA input current, enabling precise system-level power sequencing. The dedicated BYPASS pin accepts a 10 nF capacitor to reduce output noise to 30 µVRMS (300 Hz–50 kHz), while stability is ensured with output capacitors as low as 2.2 µF and ESR down to 5 mΩ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.0 V ±1% (A-grade), ensuring stable rail for 3.3 V–4.2 V logic and analog subsystems without external feedback. |
| Max Output Current | 150 mA continuous, supporting moderate-power microcontrollers, sensors, and RF front-ends in portable designs. |
| Dropout Voltage | 280 mV typ. / 575 mV max at 150 mA and –40°C to 125°C, enabling operation from single-cell Li-ion (3.0–4.2 V) or 5 V rails with minimal headroom loss. |
| Quiescent Current | 75 µA typ. at 1 mA load; <1 µA in shutdown (ON/OFF < 0.15 V), extending battery life in sleep-mode applications. |
| Output Noise | 30 µVRMS (300 Hz–50 kHz) with 10 nF BYPASS capacitor, suitable for noise-sensitive ADCs, audio codecs, and PLLs. |
| PSRR | 45 dB at 1 kHz with BYPASS pin active, rejecting switching noise from upstream DC-DC converters. |
| Stability | Guaranteed with ≥2.2 µF ceramic output capacitor and ESR as low as 5 mΩ-enabling small, low-cost, high-reliability designs. |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, surface-mount, thermally enhanced for PCB heat dissipation (RθJA = 169.0°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Input voltage supply | Accepts 2.5–16 V input; requires ≥1 µF ceramic input capacitor placed ≤1 cm from pin for stability and transient response. |
| GND (Pin 2) | Ground reference | Device substrate connection; must be tied to clean analog ground plane to minimize noise coupling and ensure regulation accuracy. |
| ON/OFF (Pin 3) | Enable/disable control | Logic-high (>1.6 V) enables regulator; logic-low (<0.15 V) disables output and reduces quiescent current to <1 µA. |
| BYPASS (Pin 4) | Noise reduction node | Connects to GND via 10 nF ceramic capacitor to shunt reference noise, reducing 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 output capacitor with ESR ≤50 mΩ for full-load stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 280 mV typical at 150 mA enables use with single-cell Li-ion batteries down to 3.0 V while maintaining 4.0 V output. |
| Low-noise architecture | 30 µVRMS output noise with 10 nF BYPASS capacitor meets requirements of precision ADCs and RF synthesizers. |
| Shutdown control | ON/OFF pin draws <0.8 µA and reduces total device current to <1 µA, enabling deep-sleep modes in portable systems. |
| Ceramic-capacitor optimized | Stable with 2.2 µF/5 mΩ ceramic output caps-eliminates need for larger, more expensive tantalum or electrolytic types. |
| Integrated protection | Thermal shutdown and foldback current limiting prevent damage during overload or short-circuit conditions. |
Applications
| Cellular Handset Power Rail | Wearable Sensor Node Supply |
|---|---|
|
Use Scenario: Powers baseband processor I/O and RF transceiver bias circuits in compact cellular handsets operating from a shared 4.2 V Li-ion battery. IC Role / Device Role / Timing Role: Primary LDO providing clean, regulated 4.0 V rail with fast transient response to handle burst-mode TX current spikes. Use Value: 280 mV dropout ensures >4.0 V output even at end-of-battery (3.4 V input); 30 µVRMS noise prevents RX desensitization. |
Use Scenario: Supplies ultra-low-power MCU, MEMS accelerometer, and BLE radio in coin-cell–powered fitness trackers. IC Role / Device Role / Timing Role: System power manager enabling dynamic ON/OFF control synchronized with sensor sampling intervals. Use Value: <1 µA shutdown current extends 200 mAh coin-cell life to >1 year; 1% accuracy maintains consistent ADC reference scaling. |
| Portable Medical Monitor Front-End | Industrial Handheld Scanner Logic Supply |
|
Use Scenario: Provides stable 4.0 V supply to analog front-end (AFE) and signal chain components in battery-operated ECG monitors. IC Role / Device Role / Timing Role: Low-noise voltage source for precision instrumentation amplifiers and 16-bit SAR ADCs. Use Value: 30 µVRMS noise and 45 dB PSRR suppress switching artifacts from nearby DC-DC converters, preserving SNR >85 dB. |
Use Scenario: Delivers regulated 4.0 V to barcode image sensor, FPGA configuration logic, and USB interface in rugged handheld scanners. IC Role / Device Role / Timing Role: Robust power conditioner handling wide input variation (3.6–5.5 V) from primary battery or USB port. Use Value: 150 mA capability supports simultaneous imaging + data transmission; thermal protection prevents latch-up in sealed 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-4002E/MB | 300 mA output, 6 µA quiescent current (active), no BYPASS pin; 4.0 V output tolerance ±2%. | Lacks low-noise bypass path; unsuitable for precision analog or RF applications requiring <50 µVRMS noise. | Select when higher output current is needed and noise is not critical; verify thermal margin at 150 mA in SOT-23. |
| TLC7705IPK | 5 V only output; 10 µA quiescent current; no ON/OFF control; requires ≥10 µF output capacitance. | Not pin-compatible; incompatible with 4.0 V systems; lacks enable and bypass functionality essential for portable designs. | Consider only for legacy 5 V-only systems where footprint change and redesign are acceptable. |
Compared with MCP1700T-4002E/MB and TLC7705IPK, the LP2985IM5-4.0 uniquely combines 4.0 V precision output, sub-µA shutdown, BYPASS-enabled 30 µVRMS noise, and SOT-23-5 pinout-making it the only option meeting stringent low-noise, low-power, and space-constrained requirements simultaneously.
Availability
LP2985IM5-4.0 is available at Aetrix Electronics and suitable for cellular handsets, wearable sensor nodes, portable medical monitors, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LP2985IM5-4.0 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 specializing in analog and embedded processing technologies, with leadership in power management ICs for portable, industrial, and automotive markets.
The LP2985-N product line delivers micropower, ultra-low-dropout regulators optimized for battery-powered devices demanding high accuracy, low noise, and minimal quiescent current in ultra-small packages.
FAQ
What is the minimum input voltage required for LP2985IM5-4.0 to maintain regulation?
The LP2985IM5-4.0 requires a minimum input voltage of VOUT + dropout voltage. At 150 mA and 25°C, dropout is typically 280 mV, so minimum VIN is ~4.28 V. Over temperature and load, maximum dropout reaches 575 mV, requiring VIN ≥ 4.575 V for guaranteed 4.0 V output across –40°C to 125°C. The datasheet specifies recommended minimum VIN as the greater of 3.1 V or VOUT + rated dropout voltage.
Can LP2985IM5-4.0 operate with a 1 µF output capacitor?
No - the LP2985IM5-4.0 requires a minimum of 2.2 µF ceramic output capacitance for guaranteed stability across all loads and temperatures. Using only 1 µF risks oscillation or poor transient response. The device is optimized for low-ESR ceramics (as low as 5 mΩ), and increasing capacitance beyond 2.2 µF is permitted and often improves load-step performance.
How does the BYPASS pin on LP2985IM5-4.0 reduce output noise?
The BYPASS pin connects to an internal low-noise reference buffer. Adding a 10 nF ceramic capacitor between BYPASS and GND filters high-frequency reference noise, reducing total output RMS noise from ~120 µV to 30 µV (300 Hz–50 kHz bandwidth). Omitting the capacitor increases noise but retains regulation; it is optional only in non-noise-critical applications.
Is LP2985IM5-4.0 compatible with tantalum output capacitors?
The LP2985IM5-4.0 is explicitly designed and characterized for ceramic output capacitors with ESR ≥5 mΩ. While tantalum capacitors may function in some cases, they are not guaranteed for stability due to higher ESR variation with temperature and aging. TI recommends ceramic capacitors exclusively to ensure full-spec performance, especially at light loads and over temperature.
What happens to LP2985IM5-4.0 when the ON/OFF pin is left floating?
The ON/OFF pin has no internal pull-up or pull-down; if left floating, its voltage is indeterminate and may drift near the logic threshold (0.15–1.6 V), causing unpredictable enable/disable behavior or partial conduction. TI mandates active termination: tie to VIN for always-on operation or to GND (via switch/microcontroller) for controlled shutdown. A 100 kΩ pull-up to VIN is acceptable if external control is needed.
LP2985IM5-4.0 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):
- 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
LP2985IM5-4.0 FAQ
1.How can I place an order for LP2985IM5-4.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2985IM5-4.0 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 LP2985IM5-4.0 reliable?
The price and inventory of LP2985IM5-4.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2985IM5-4.0 is usually 5 days.
3.What payment methods are accepted for LP2985IM5-4.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2985IM5-4.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2985IM5-4.0?
LP2985IM5-4.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2985IM5-4.0 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 LP2985IM5-4.0?
For technical support, including LP2985IM5-4.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2985IM5-4.0 requirements.
6.How does Aetrix verify that LP2985IM5-4.0 is sourced from the original manufacturer or authorized distributors?
All LP2985IM5-4.0 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 LP2985IM5-4.0 meets industry standards.
7.What is the process for return or replacement of LP2985IM5-4.0?
All LP2985IM5-4.0 units undergo pre-shipment inspection (PSI). If there is an issue with LP2985IM5-4.0, 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 LP2985IM5-4.0 part is unused and in its original packaging.
Return procedure for LP2985IM5-4.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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