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Texas Instruments LP3984IMF-3.1/NOPB
- Part No.:
- LP3984IMF-3.1/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP3984IMF-3.1/NOPB.pdf
- Description:
- IC REG LINEAR 3.1V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,635
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Product details
Overview
LP3984IMF-3.1/NOPB from Texas Instruments is a micropower, ultra-low-dropout CMOS voltage regulator delivering 3.1 V at up to 150 mA from 2.5–6.0 V input. It features 75 mV typical dropout at full load, ≤1.2 µA shutdown quiescent current, and fast 20 µs turn-on time-optimized for battery-powered mobile handsets requiring stable low-noise supply rails.
For engineers reviewing the LP3984IMF-3.1/NOPB datasheet, LP3984IMF-3.1/NOPB pinout, LP3984IMF-3.1/NOPB application, or LP3984IMF-3.1/NOPB equivalent, key selection criteria include input voltage range compatibility, tantalum-capacitor stability, thermal shutdown behavior, and SOT-23-5 package footprint constraints in space-constrained RF front-end and baseband power domains.
Technical Context
The LP3984IMF-3.1/NOPB employs a CMOS pass transistor architecture enabling ultra-low quiescent current (≤1.2 µA in shutdown) and minimal ground current increase in dropout-critical for extending battery life in portable wireless systems. Its internal bandgap reference and error amplifier maintain output regulation across −40°C to +125°C junction temperature.
Designed for direct integration with 1 µF tantalum output capacitors (2–10 Ω ESR), the regulator achieves 60 dB PSRR at 1 kHz and sustains ≥40 dB rejection up to 10 kHz-supporting clean power delivery to sensitive RF ICs and analog baseband circuits without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.1 V ±1.2% tolerance-ensures precise biasing of 3.3 V–tolerant RF transceivers and baseband processors. |
| Max Output Current | 150 mA continuous-supports peak current demands of GSM/CDMA power amplifiers and digital signal processors. |
| Dropout Voltage | 75 mV typ. at 150 mA-enables operation down to VIN = 3.175 V, preserving battery runtime in single-cell Li-ion systems. |
| Quiescent Current | ≤1.2 µA in shutdown mode-minimizes standby leakage in always-on cellular modem subsystems. |
| PSRR | 60 dB @ 1 kHz, 40 dB @ 10 kHz-suppresses switching noise from DC/DC converters feeding adjacent analog circuitry. |
| Turn-On Time | 20 µs typ.-meets fast wake-up timing requirements for burst-mode transmission in CDMA and WCDMA handsets. |
| Junction Temp Range | −40°C to +125°C-validated for operation in thermally stressed handheld enclosures and automotive infotainment modules. |
Pinout & Package
SOT-23-5 package (DBV drawing), 2.9 mm × 1.6 mm × 1.15 mm body height, RoHS-compliant lead finish (CuSn), moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 2.5–6.0 V unregulated input; requires local 1 µF ceramic/tantalum decoupling within 1 cm of pin. |
| GND | Power ground reference | Common return path for input/output currents; must connect to low-impedance analog ground plane. |
| VOUT | Regulated output | Delivers stable 3.1 V; requires 1–22 µF tantalum capacitor (2–10 Ω ESR) for guaranteed stability. |
| VEN | Logic-enable input | Active-high control: VIH ≥1.4 V, VIL ≤0.4 V; enables fast sequencing with external microcontroller GPIO. |
| N.C. | No connection | Pin 4 is unconnected internally-must remain floating or grounded per layout best practices; not usable as thermal pad. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with tantalum capacitors | Eliminates need for costly low-ESR ceramics; supports compact 1 µF output capacitor in high-reliability portable designs. |
| Ultra-low shutdown current | ≤1.2 µA ensures <1 µA system-level standby drain-critical for multi-week shelf life in cellular IoT devices. |
| Fast enable response | 20 µs turn-on time enables synchronous power gating with baseband processor wake signals. |
| Thermal shutdown protection | 160°C trip point with 20°C hysteresis prevents damage during sustained overload or poor PCB heatsinking. |
| High PSRR at RF frequencies | Maintains ≥40 dB rejection up to 10 kHz-directly mitigates noise coupling from buck converter switching edges into RF receivers. |
Applications
| CDMA Cellular Handsets | Wideband CDMA Cellular Handsets |
|---|---|
|
Use Scenario: Powering CDMA transceiver RF sections and analog baseband during active call mode with intermittent high-current bursts. IC Role / Device Role / Timing Role: Primary LDO supplying regulated 3.1 V rail to PA driver stages and low-noise amplifiers. Use Value: 75 mV dropout preserves headroom on aging Li-ion batteries; 60 dB PSRR isolates RF chain from noisy DC/DC converter outputs. |
Use Scenario: Providing clean, sequenced power to WCDMA modem core logic and ADC/DAC interfaces during data sessions. IC Role / Device Role / Timing Role: Always-on LDO for real-time clock and memory retention, enabled via baseband-controlled VEN signal. Use Value: ≤1.2 µA shutdown current extends battery life during idle periods; fast 20 µs turn-on synchronizes with WCDMA slot timing. |
| GSM Cellular Handsets | Portable Information Appliances |
|
Use Scenario: Delivering stable 3.1 V to GSM power amplifier modules during TDMA transmit bursts (217 Hz envelope). IC Role / Device Role / Timing Role: High-PSRR LDO placed adjacent to PA block to suppress supply-induced phase noise. Use Value: 40 dB PSRR at 10 kHz attenuates switching harmonics from PMU DC/DC converters, improving EVM performance. |
Use Scenario: Regulating power for LCD controller, touch interface, and flash memory in handheld PDAs and e-readers. IC Role / Device Role / Timing Role: System-level LDO managing multiple low-power peripherals via shared enable line. Use Value: Tantalum capacitor compatibility reduces BOM cost and board area versus ceramic alternatives; −40°C to +125°C rating supports outdoor use. |
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; higher 250 µA quiescent current; requires ceramic output capacitor. | Targeted at industrial RS-485 transceivers-not optimized for RF noise-sensitive handset applications. | Choose only if 3.3 V output and higher IQ are acceptable and ceramic capacitor use is preferred. |
| TPS78231DRVR | 3.1 V output; 1.3 µA shutdown IQ; 100 mA max output; requires 1 µF ceramic capacitor. | Lower current capability limits use in PA-supply roles; tighter 1% output tolerance suits precision analog rails. | Select when lower output current suffices and ceramic capacitor design flexibility is prioritized over tantalum compatibility. |
Compared with LP3984IMF-3.1/NOPB, TSS721AIDR trades RF-grade PSRR and ultra-low shutdown IQ for industrial bus interface robustness, while TPS78231DRVR offers tighter voltage accuracy and ceramic support at the expense of output current headroom and tantalum stability assurance.
Availability
LP3984IMF-3.1/NOPB is available at Aetrix Electronics and suitable for CDMA/WCDMA handset power management, portable information appliance subsystems, and GSM RF front-end regulation requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LP3984IMF-3.1/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 specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and consumer markets.
The LP3984IMF-3.1/NOPB belongs to TI's micropower LDO family engineered for battery-powered wireless handsets-emphasizing ultra-low IQ, fast transient response, and capacitor flexibility to reduce system size and cost.
FAQ
What is the maximum input voltage rating for LP3984IMF-3.1/NOPB?
The absolute maximum input voltage for LP3984IMF-3.1/NOPB is 6.5 V, but recommended operating range is 2.5 V to 6.0 V. Exceeding 6.5 V risks permanent damage per TI's Absolute Maximum Ratings. For reliable operation in Li-ion battery applications, VIN should stay below 4.3 V during charge cycles to avoid overstress.
Can LP3984IMF-3.1/NOPB operate stably with ceramic output capacitors?
LP3984IMF-3.1/NOPB is explicitly characterized and guaranteed stable with 1–22 µF tantalum capacitors (2–10 Ω ESR). While some ceramic capacitors may work, TI does not specify or guarantee stability with ceramics due to their near-zero ESR-using them risks oscillation. The datasheet mandates tantalum for production designs.
What is the thermal shutdown threshold and hysteresis of LP3984IMF-3.1/NOPB?
LP3984IMF-3.1/NOPB activates thermal shutdown at 160°C junction temperature and remains latched off until junction temperature falls by 20°C (to ~140°C) before automatic recovery. This hysteresis prevents cycling near the trip point during transient thermal overload in compact handheld enclosures.
How does the enable pin (VEN) interface with standard logic levels?
VEN is a CMOS-compatible enable input: VIH ≥1.4 V (minimum high-level voltage) and VIL ≤0.4 V (maximum low-level voltage) across full input voltage range (2.5–6.0 V). It draws ≤1 nA input current, allowing direct drive from microcontroller GPIO without level-shifting or pull-up resistors.
Is LP3984IMF-3.1/NOPB pin-compatible with other output voltage variants in the same package?
Yes-LP3984IMF-3.1/NOPB shares identical SOT-23-5 (DBV) pinout and footprint with LP3984IMF-1.5/NOPB, LP3984IMF-1.8/NOPB, and LP3984IMF-2.9/NOPB. All variants use VIN, GND, VOUT, VEN, and N.C. pins in the same physical arrangement, enabling drop-in replacement for voltage tuning during design iteration.
LP3984IMF-3.1/NOPB 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/NOPB FAQ
1.How can I place an order for LP3984IMF-3.1/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3984IMF-3.1/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 LP3984IMF-3.1/NOPB reliable?
The price and inventory of LP3984IMF-3.1/NOPB 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/NOPB is usually 5 days.
3.What payment methods are accepted for LP3984IMF-3.1/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3984IMF-3.1/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3984IMF-3.1/NOPB?
LP3984IMF-3.1/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3984IMF-3.1/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 LP3984IMF-3.1/NOPB?
For technical support, including LP3984IMF-3.1/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3984IMF-3.1/NOPB requirements.
6.How does Aetrix verify that LP3984IMF-3.1/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3984IMF-3.1/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 LP3984IMF-3.1/NOPB meets industry standards.
7.What is the process for return or replacement of LP3984IMF-3.1/NOPB?
All LP3984IMF-3.1/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3984IMF-3.1/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 LP3984IMF-3.1/NOPB part is unused and in its original packaging.
Return procedure for LP3984IMF-3.1/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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