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Texas Instruments LP3984IMF-3.1
- Part No.:
- LP3984IMF-3.1
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP3984IMF-3.1.pdf
- Description:
- IC REG LINEAR 3.1V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,768
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Product details
Overview
LP3984IMF-3.1 from Texas Instruments is a micropower 150 mA ultra-low-dropout CMOS voltage regulator in SOT-23-5 package, delivering fixed 3.1 V output with ≤75 mV dropout at 150 mA load, 60 dB PSRR at 1 kHz, and ≤1.2 µA shutdown current - optimized for battery-powered CDMA/GSM handsets requiring stable low-noise rail generation.
For engineers reviewing the LP3984IMF-3.1 datasheet, LP3984IMF-3.1 pinout, LP3984IMF-3.1 application, or LP3984IMF-3.1 equivalent, key selection considerations include input voltage range (2.5–6.0 V), fast 20 µs turn-on time, tantalum-capacitor compatibility, thermal shutdown protection, and −40°C to +125°C junction temperature operation.
Technical Context
The LP3984IMF-3.1 employs a CMOS pass transistor architecture enabling ultra-low quiescent current and minimal ground current increase in dropout, extending battery life in portable wireless systems. Its internal bandgap reference and error amplifier maintain ±1.2% output voltage tolerance over temperature and load.
It integrates logic-controlled enable (VEN), thermal shutdown (160°C trip), short-circuit current limiting (600 mA), and stability with 1 µF tantalum output capacitors (2–10 Ω ESR). The device operates without external compensation and remains stable under no-load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.1 V ±1.2% - ensures precise biasing for RF front-end ICs and baseband processors in cellular handsets. |
| Max Output Current | 150 mA - supports power delivery to multiple low-power subsystems (e.g., audio codec, sensor interface) from single LDO. |
| Dropout Voltage | 75 mV typ. @ 150 mA - enables regulation down to VIN = 3.175 V, critical for Li-ion battery discharge tail-end operation. |
| PSRR | 60 dB @ 1 kHz, 40 dB @ 10 kHz - suppresses switching noise from DC/DC converters feeding adjacent rails in compact handset PCBs. |
| Quiescent Current | ≤1.2 µA in shutdown - minimizes standby leakage in always-on circuits like real-time clock or memory backup supplies. |
| Turn-On Time | 20 µs typ. - enables rapid power sequencing for wake-up events in sleep-mode cellular protocols. |
| Operating Temp | −40°C to +125°C junction - qualified for extended thermal environments in sealed mobile enclosures and automotive infotainment modules. |
Pinout & Package
SOT-23-5 package (DBV drawing), 2.9 mm × 1.6 mm × 1.15 mm body, RoHS-compliant green finish (CU SN), moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 2.5–6.0 V DC; requires ≥1 µF input capacitor placed within 1 cm of pin for stability and transient response. |
| GND | Power ground reference | Common return path for input/output currents; must connect to clean analog ground plane to minimize noise coupling. |
| VOUT | Regulated output | Delivers fixed 3.1 V ±1.2%; stable with 1–22 µF tantalum capacitor (2–10 Ω ESR) directly at pin. |
| VEN | Logic-enable input | Active-high control: VIH ≥1.4 V, VIL ≤0.4 V; ties to VIN for always-on operation or microcontroller GPIO for dynamic power gating. |
| N.C. | No connection | Unused terminal; must remain unconnected per TI design - not tied to GND or any other node. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower shutdown | ≤1.2 µA IQ enables >1-year battery shelf life in keep-alive applications like CMOS RAM backup. |
| Tantalum capacitor support | Stable with 1 µF tantalum output cap - eliminates need for larger, more expensive ceramic alternatives in space-constrained layouts. |
| Fast enable response | 20 µs turn-on time allows synchronous power-up with baseband processor clocks during LTE/WCDMA burst transmission. |
| Thermal & short-circuit protection | 160°C thermal shutdown with 20°C hysteresis and 600 mA short-circuit limit prevent damage during board-level fault conditions. |
| Low-noise regulation | 90 µVRMS output noise (10 Hz–100 kHz) avoids interference with sensitive RF receivers and ADC references. |
Applications
| CDMA Cellular Handsets | Wideband CDMA Cellular Handsets |
|---|---|
Use Scenario: Powering RF transceiver ICs and low-noise amplifiers in dual-band CDMA handsets operating on 800/1900 MHz bands. IC Role / Device Role / Timing Role: Primary 3.1 V LDO supplying bias to PA driver stages and mixer cores, synchronized to TX enable signals via VEN pin. Use Value: 75 mV dropout preserves headroom as Li-ion voltage drops below 3.3 V; 60 dB PSRR isolates RF section from noisy DC/DC converter ripple. | Use Scenario: Providing clean 3.1 V supply to WCDMA baseband processor I/O banks and analog front-end during high-data-rate HSPA+ sessions. IC Role / Device Role / Timing Role: Dedicated LDO for digital I/O rail, enabled only during active data transfer using processor-controlled VEN signal. Use Value: 20 µs turn-on ensures immediate voltage stabilization before first data byte transmission; 90 µVRMS noise prevents bit errors in high-speed serial interfaces. |
| GSM Cellular Handsets | Portable Information Appliances |
Use Scenario: Regulating 3.1 V for GSM power amplifier modules during TDMA burst transmission with 217 Hz envelope modulation. IC Role / Device Role / Timing Role: High-stability LDO decoupling PA supply from main system rail, with VEN synchronized to GSM transmit slot timing. Use Value: Fast transient response (Fig. 9–14) maintains output regulation during 2-A PA current spikes; thermal shutdown protects against antenna mismatch faults. | Use Scenario: Supplying 3.1 V to embedded microcontroller peripherals (USB PHY, touch controller, display driver) in handheld PDAs and e-readers. IC Role / Device Role / Timing Role: Always-on LDO for non-volatile memory and RTC, with VEN tied to VIN to guarantee continuous operation during sleep cycles. Use Value: ≤1.2 µA shutdown current extends battery runtime beyond 6 months in standby; no-load stability eliminates need for dummy loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL720F31 | 300 mA output, 250 mV dropout @ full load, 35 µA quiescent current in operation | Higher current capability but higher IQ - less suitable for ultra-low-power standby modes | Choose when system load exceeds 150 mA or requires tighter load regulation (0.002%/mA vs. LP3984IMF-3.1's 0.005%/mA) |
| MCP1700T-3102E/MB | SOT-23-3 package, no enable pin, 2.3 µA IQ in shutdown, 6 V max input | Lacks logic enable - requires external FET or resistor divider for controlled shutdown | Choose when board space is constrained and enable functionality is unnecessary; verify thermal derating for 150 mA in SOT-23-3 |
Compared with TPL720F31 and MCP1700T-3102E/MB, the LP3984IMF-3.1 uniquely balances micropower shutdown (≤1.2 µA), fast enable (20 µs), and proven tantalum-capacitor stability - making it optimal for space- and battery-life-sensitive cellular handset designs where all three traits are simultaneously required.
Availability
LP3984IMF-3.1 is available at Aetrix Electronics and suitable for CDMA/GSM handset manufacturing, portable information appliance production, and industrial telemetry modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LP3984IMF-3.1 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 expertise in power management IC design for portable electronics.
The LP3984IMF-3.1 belongs to TI's micropower LDO family engineered specifically for battery-powered wireless communication devices - emphasizing ultra-low IQ, fast transient response, and robustness in thermally demanding handheld form factors.
FAQ
What is the maximum input voltage rating for the LP3984IMF-3.1?
The LP3984IMF-3.1 has an absolute maximum input voltage (VIN) rating of 6.5 V, with recommended operating range from 2.5 V to 6.0 V. Exceeding 6.5 V risks permanent damage. For reliable operation across temperature, VIN should remain ≤6.0 V per datasheet specifications, especially when paired with 3.1 V output to maintain sufficient dropout margin.
Does the LP3984IMF-3.1 require an external bypass capacitor?
The LP3984IMF-3.1 does not require an external bypass capacitor for basic operation, as its internal bandgap reference is stabilized without one. However, adding a small capacitor (e.g., 1–10 nF) between VOUT and GND can further reduce output noise - particularly beneficial in RF-sensitive applications. The device remains stable with only the mandatory 1 µF tantalum output capacitor.
Can the LP3984IMF-3.1 be used with ceramic output capacitors?
The LP3984IMF-3.1 is explicitly characterized and guaranteed stable with tantalum output capacitors (1–22 µF, 2–10 Ω ESR). While some ceramic capacitors may work empirically, TI does not specify stability margins or phase margin for ceramic types due to their near-zero ESR - risking oscillation. Use only tantalum or film capacitors per datasheet guidance to ensure guaranteed performance.
What is the thermal shutdown behavior of the LP3984IMF-3.1?
The LP3984IMF-3.1 activates thermal shutdown at 160°C junction temperature and includes 20°C hysteresis, meaning it resumes regulation only after cooling to ~140°C. During shutdown, output is disabled and quiescent current remains ≤1.2 µA. This protects against sustained overload or poor PCB thermal design while allowing automatic recovery once temperature normalizes - critical for unattended portable devices.
Is the LP3984IMF-3.1 pin-compatible with other variants in the LP3984 family?
Yes - all LP3984 variants in SOT-23-5 package (e.g., LP3984IMF-1.5/NOPB, LP3984IMF-1.8/NOPB) share identical pinout (VIN, GND, VOUT, VEN, N.C.) and footprint. The LP3984IMF-3.1 can replace other 5-pin versions on the same PCB without layout changes, provided the 3.1 V output matches system requirements and thermal limits are verified for the specific load condition.
LP3984IMF-3.1 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):
- 6V
- Voltage - Output (Min/Fixed):
- 3.1V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.12V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 125 µA
- Current - Supply (Max):
- 150 µA
- PSRR:
- 60dB ~ 40dB (1kHz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LP3984IMF-3.1 FAQ
1.How can I place an order for LP3984IMF-3.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3984IMF-3.1 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 LP3984IMF-3.1 reliable?
The price and inventory of LP3984IMF-3.1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3984IMF-3.1 is usually 5 days.
3.What payment methods are accepted for LP3984IMF-3.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3984IMF-3.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3984IMF-3.1?
LP3984IMF-3.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3984IMF-3.1 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 LP3984IMF-3.1?
For technical support, including LP3984IMF-3.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3984IMF-3.1 requirements.
6.How does Aetrix verify that LP3984IMF-3.1 is sourced from the original manufacturer or authorized distributors?
All LP3984IMF-3.1 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 LP3984IMF-3.1 meets industry standards.
7.What is the process for return or replacement of LP3984IMF-3.1?
All LP3984IMF-3.1 units undergo pre-shipment inspection (PSI). If there is an issue with LP3984IMF-3.1, 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 LP3984IMF-3.1 part is unused and in its original packaging.
Return procedure for LP3984IMF-3.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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