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Texas Instruments LP3984IMF-1.8/NOPB
- Part No.:
- LP3984IMF-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP3984IMF-1.8/NOPB.pdf
- Description:
- IC REG LINEAR 1.8V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,739
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Product details
Overview
LP3984IMF-1.8/NOPB from Texas Instruments is a micropower, ultra-low-dropout CMOS voltage regulator delivering 1.8 V at up to 150 mA from 2.5–6.0 V input, featuring 75 mV typical dropout at full load, ≤1.2 µA shutdown current, and stable operation with 1 µF tantalum output capacitors. It serves as a primary power rail regulator in space-constrained portable RF subsystems.
For engineers reviewing the LP3984IMF-1.8/NOPB datasheet, LP3984IMF-1.8/NOPB pinout, LP3984IMF-1.8/NOPB application, or LP3984IMF-1.8/NOPB equivalent, key selection criteria include dropout performance under 150 mA load, PSRR >60 dB at 1 kHz, thermal shutdown at 160°C, fast 20 µs turn-on time, and compatibility with low-ESR tantalum output capacitors in SOT-23-5 packaging.
Technical Context
The LP3984IMF-1.8/NOPB employs a CMOS pass transistor architecture optimized for battery-powered systems, enabling minimal quiescent current increase in dropout and maintaining high PSRR down to low VIN levels common in partially discharged Li-ion cells. Its internal bandgap reference and error amplifier deliver ±1.2% output voltage tolerance over −40°C to +125°C.
Logic-controlled enable (VEN) operates with VIH = 1.4 V and VIL = 0.4 V, supporting direct interfacing with 1.8 V/3.3 V GPIOs. The device integrates thermal shutdown with 20°C hysteresis and short-circuit current limiting at 600 mA, ensuring robustness in transient fault conditions without external protection circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V ±1.2% - tightly regulated rail for core logic or RF IC biasing |
| Max Output Current | 150 mA - sufficient for baseband processors or low-power transceivers |
| Dropout Voltage | 75 mV typ. @ 150 mA - enables regulation down to ~1.875 V input, extending battery runtime |
| Quiescent Current | ≤1.2 µA in shutdown - preserves battery life during deep sleep modes |
| PSRR | 60 dB @ 1 kHz, 40 dB @ 10 kHz - suppresses switching noise from adjacent DC/DC converters |
| Turn-On Time | 20 µs typ. - supports rapid power sequencing in wake-up events |
| Operating Temp | −40°C to +125°C junction - qualified for industrial and automotive infotainment environments |
Pinout & Package
LP3984IMF-1.8/NOPB uses the SOT-23-5 (DBV) package: 2.9 mm × 1.6 mm × 1.15 mm body, surface-mount, RoHS-compliant tin-silver (CU SN) finish, MSL Level-1 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 2.5–6.0 V; requires ≥1 µF input capacitor within 1 cm of pin |
| GND | Power ground reference | Common return path for input, output, and enable circuits; must connect to clean analog ground |
| VOUT | Regulated output | Delivers stable 1.8 V; requires 1–22 µF tantalum capacitor with 2–10 Ω ESR |
| VEN | Enable control input | Active-high logic interface; VIH ≥1.4 V turns regulator on, VIL ≤0.4 V disables output |
| N.C. | No connection | Unused terminal; must remain unconnected per TI design guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 75 mV @ 150 mA enables operation with <100 mV headroom, critical for single-cell Li-ion systems |
| Tantalum capacitor support | Stable with 1 µF minimum tantalum output capacitor-reduces BOM count vs. ceramic + ESR network solutions |
| Fast enable response | 20 µs turn-on time allows precise power sequencing in multi-rail mobile SoC designs |
| Low-noise regulation | 90 µVRMS output noise (10 Hz–100 kHz) minimizes interference in sensitive RF receiver chains |
| Integrated protection | Thermal shutdown (160°C) and 600 mA short-circuit limit eliminate need for external fault management circuitry |
Applications
| CDMA Cellular Handsets | Wideband CDMA Cellular Handsets |
|---|---|
Use Scenario: Powering baseband processor I/O banks and RF front-end bias rails in dual-mode handsets. IC Role / Device Role / Timing Role: Primary LDO supplying 1.8 V to digital I/O interfaces requiring tight voltage tolerance and fast transient response. Use Value: 75 mV dropout extends usable battery range by maintaining regulation until cell voltage drops to ~1.875 V. | Use Scenario: Regulating low-noise supply for WCDMA transceiver analog sections including PLL VCO and ADC drivers. IC Role / Device Role / Timing Role: Low-noise, high-PSRR LDO isolating sensitive RF circuitry from noisy digital supply domains. Use Value: 60 dB PSRR at 1 kHz suppresses coupling from 2.4 GHz PA switching harmonics into receive path. |
| GSM Cellular Handsets | Portable Information Appliances |
Use Scenario: Supplying 1.8 V to GSM modem core logic and SIM interface during burst transmission cycles. IC Role / Device Role / Timing Role: Enable-controlled LDO synchronized to TDMA frame timing for dynamic power gating. Use Value: ≤1.2 µA shutdown current reduces standby leakage, extending weeks-long idle battery life. | Use Scenario: Providing regulated 1.8 V to microcontroller peripherals and display driver ICs in handheld PDAs and e-readers. IC Role / Device Role / Timing Role: Compact-area LDO replacing larger SOT-23-6 alternatives to meet sub-10 mm² PCB footprint targets. Use Value: SOT-23-5 package (2.9 × 1.6 mm) saves >30% board area versus competing 5-pin regulators with similar specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLS820B18T | Automotive-grade AEC-Q100 qualified; higher 250 mA output; 200 mV dropout @ 150 mA | Designed for 12 V automotive systems with integrated watchdog and reset functions | Select when automotive qualification, higher current, or system monitoring features are required |
| MCP1700T-1802E/MB | 150 mA output; 175 mV dropout @ 150 mA; 2.3 µA quiescent current in shutdown | Optimized for ultra-low-power sensor nodes; no thermal shutdown or short-circuit protection | Select for cost-sensitive, non-safety-critical IoT endpoints where protection features are omitted |
Compared with TLS820B18T and MCP1700T-1802E/MB, the LP3984IMF-1.8/NOPB delivers superior dropout performance (75 mV vs. ≥175 mV) and integrated fault protection, making it optimal for space- and efficiency-constrained portable RF applications where battery headroom and reliability are critical.
Availability
LP3984IMF-1.8/NOPB is available at Aetrix Electronics and suitable for CDMA/WCDMA handset power management, portable information appliance subsystems, and industrial wireless sensor node designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP3984IMF-1.8/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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in power management IC design.
The LP3984 product line was engineered specifically for micropower, ultra-low-dropout regulation in battery-powered portable wireless devices, emphasizing minimal board area, low quiescent current, and compatibility with space-saving tantalum capacitors.
FAQ
What is the maximum input voltage rating for LP3984IMF-1.8/NOPB?
The absolute maximum input voltage for LP3984IMF-1.8/NOPB is 6.5 V, but recommended operating range is 2.5 V to 6.0 V. Exceeding 6.5 V risks permanent damage. Operation above 6.0 V is not characterized and may degrade long-term reliability or violate thermal limits, especially at elevated ambient temperatures.
Does LP3984IMF-1.8/NOPB require an external bypass capacitor?
LP3984IMF-1.8/NOPB does not have a dedicated bypass pin; its fast 20 µs turn-on time is achieved via an internal 70 µA charging current source for the bandgap reference. No external bypass capacitor is required or specified-designers should focus instead on proper 1 µF input and 1–22 µF tantalum output capacitor placement per TI layout guidelines.
Can LP3984IMF-1.8/NOPB operate with ceramic output capacitors?
LP3984IMF-1.8/NOPB is explicitly designed and characterized for stability with tantalum output capacitors (1–22 µF, 2–10 Ω ESR). While some ceramic capacitors may function, TI does not guarantee stability with ceramics due to their near-zero ESR, which can induce oscillation. Use only tantalum or film types per the datasheet's APPLICATION HINTS section.
What is the thermal resistance (θJA) of LP3984IMF-1.8/NOPB in its SOT-23-5 package?
The junction-to-ambient thermal resistance (θJA) for LP3984IMF-1.8/NOPB in the SOT-23-5 (DBV) package is 220°C/W under standard JEDEC test conditions. This value assumes a 1-inch² copper pad with two vias; actual θJA will improve with enhanced PCB copper area and thermal vias, directly impacting safe continuous power dissipation.
Is LP3984IMF-1.8/NOPB pin-compatible with other output voltage variants in the same family?
Yes-LP3984IMF-1.8/NOPB shares identical SOT-23-5 (DBV) pinout and footprint with LP3984IMF-1.5/NOPB, LP3984IMF-2.9/NOPB, and LP3984IMF-3.1/NOPB. All variants use VIN, GND, VOUT, VEN, and N.C. pins in the same physical locations, enabling voltage-scaling flexibility without PCB redesign.
LP3984IMF-1.8/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):
- 1.8V
- 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-1.8/NOPB FAQ
1.How can I place an order for LP3984IMF-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3984IMF-1.8/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-1.8/NOPB reliable?
The price and inventory of LP3984IMF-1.8/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-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LP3984IMF-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3984IMF-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3984IMF-1.8/NOPB?
LP3984IMF-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3984IMF-1.8/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-1.8/NOPB?
For technical support, including LP3984IMF-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3984IMF-1.8/NOPB requirements.
6.How does Aetrix verify that LP3984IMF-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3984IMF-1.8/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-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LP3984IMF-1.8/NOPB?
All LP3984IMF-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3984IMF-1.8/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-1.8/NOPB part is unused and in its original packaging.
Return procedure for LP3984IMF-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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