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Texas Instruments LP3990MF-3.3
- Part No.:
- LP3990MF-3.3
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP3990MF-3.3.pdf
- Description:
- IC REG LINEAR 3.3V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,646
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Product details
Overview
LP3990MF-3.3 from Texas Instruments is a 150mA low-noise linear voltage regulator with fixed 3.3V output, designed for portable digital systems. It operates from 2.0V to 6.0V input, delivers ±1.5% output accuracy over temperature, features logic-controlled enable (VEN), and maintains stability with only 1.0µF ceramic output capacitance - enabling compact power delivery in space-constrained handheld devices.
For engineers reviewing the LP3990MF-3.3 datasheet, LP3990MF-3.3 pinout, LP3990MF-3.3 application, or LP3990MF-3.3 equivalent, key selection criteria include ultra-low quiescent current (43µA enabled / <10nA disabled), fast 105µs startup time, 150µVRMS output noise, and compatibility with standard SOT-23 PCB footprints for seamless integration into battery-powered consumer electronics.
Technical Context
The LP3990MF-3.3 implements a PMOS pass transistor architecture optimized for low dropout (120mV typical at 150mA) and minimal load-dependent regulation error (≤0.002%/mA for VOUT = 3.3V). Its internal 1MΩ pulldown on the VEN pin ensures reliable shutdown without external biasing.
It achieves 55dB PSRR at 1kHz and supports operation across −40°C to +125°C junction temperature, with thermal shutdown activation at 155°C and hysteresis of 15°C - making it suitable for thermally demanding embedded applications where predictable fault behavior is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.5% over −40°C to +125°C - ensures stable core/peripheral rail for 3.3V microcontrollers and I/O interfaces. |
| Input Voltage Range | 2.0V to 6.0V - supports single-cell Li-ion (3.0–4.2V), dual-cell alkaline (2.4–3.2V), and USB-powered (5V) systems. |
| Max Output Current | 150mA continuous - sufficient for powering low-power MCUs, sensors, and RF transceivers in portable designs. |
| Quiescent Current | 43µA (enabled), <10nA (disabled) - extends battery life in always-on or sleep-mode applications like IoT endpoints. |
| Output Capacitor | Stable with 1.0µF ceramic (ESR 5–500mΩ) - eliminates need for larger, costlier tantalum capacitors and reduces board area. |
| PSRR @ 1kHz | 55dB - suppresses ripple from noisy switching supplies upstream, preserving signal integrity in mixed-signal circuits. |
| Startup Time | 105µs to 95% of 3.3V - enables rapid wake-up from deep-sleep states without compromising system responsiveness. |
Pinout & Package
LP3990MF-3.3 is packaged in a RoHS-compliant 5-pin SOT-23 (DBV) package measuring 2.9mm × 1.6mm × 1.15mm, with gull-wing leads and lead finish CU SN. The package is moisture sensitivity level (MSL) Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input voltage supply | Accepts 2.0–6.0V; requires local 1.0µF ceramic capacitor to minimize input impedance and ensure stability. |
| 2 (GND) | Power ground reference | Common return path for input/output currents; must be connected to low-impedance PCB ground plane. |
| 3 (VEN) | Enable control input | Active-high logic input (VIH ≥ 0.95V); internal 1MΩ pulldown ensures default-off state when unconnected. |
| 4 (N/C) | No connection | Internally unconnected; must remain floating - no external connection permitted. |
| 5 (VOUT) | Regulated output | Delivers fixed 3.3V; requires 1.0µF ceramic capacitor directly between this pin and GND for loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with ceramic capacitors | Eliminates need for noise-bypass caps and enables use of small, low-cost X7R/X5R ceramics instead of bulkier alternatives. |
| Logic-controlled enable | Allows precise power sequencing and system-level sleep/wake control without external MOSFETs or level shifters. |
| Thermal & short-circuit protection | Internally limits dissipation during overload or ambient overheating, preventing permanent damage in unattended operation. |
| Low output noise | 150µVRMS (10Hz–100kHz) - preserves analog sensor accuracy and ADC resolution in mixed-signal subsystems. |
| Virtually zero shutdown IQ | <10nA quiescent current in disable mode - critical for multi-year battery life in remote sensing and wearables. |
Applications
| Cellular Handsets | Hand-Held Information Appliances |
|---|---|
|
Use Scenario: Powering baseband processor I/O rails and camera module interfaces in slim smartphone designs. IC Role / Device Role / Timing Role: Low-noise 3.3V LDO supplying clean voltage to high-speed digital interfaces (e.g., MIPI CSI-2, SDIO). Use Value: 150µVRMS noise and 55dB PSRR prevent coupling of switching noise into image data paths, reducing visual artifacts. |
Use Scenario: Regulating power for touch-screen controllers and flash memory in e-readers and portable POS terminals. IC Role / Device Role / Timing Role: Fixed-output LDO delivering stable 3.3V to NAND/NOR flash and capacitive touch ICs during intermittent read/write bursts. Use Value: 105µs startup time enables immediate response after button press, while 43µA IQ minimizes standby drain during screen-off periods. |
| Wearable Fitness Trackers | Industrial Sensor Nodes |
|
Use Scenario: Supplying 3.3V to BLE SoCs and MEMS accelerometers in coin-cell–powered wristbands. IC Role / Device Role / Timing Role: Ultra-low-IQ LDO maintaining regulated rail during deep-sleep cycles and enabling fast wake-up for motion-triggered sampling. Use Value: <10nA shutdown current extends CR2032 battery life beyond 12 months in typical usage profiles. |
Use Scenario: Providing isolated 3.3V power to RS-485 transceivers and environmental sensors in factory-floor wireless nodes. IC Role / Device Role / Timing Role: Robust LDO operating across −40°C to +125°C junction range, supporting wide ambient temperature swings in uncontrolled environments. Use Value: Thermal shutdown at 155°C prevents latch-up under sustained overcurrent or enclosure heating, ensuring field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL720F33 | Lower IQ (2.5µA enabled), same 3.3V output, but rated only to 125°C ambient (not junction), and requires minimum 2.2µF output cap. | Better suited for ultra-low-power always-on monitoring; less ideal for high-temp industrial enclosures. | Choose TPL720F33 if sub-µA active IQ is critical and thermal margin allows ambient-limited rating. |
| MCP1700T-3302E/MB | Higher dropout (600mV @ 250mA), wider input range (2.3–6.0V), but lacks enable pin and has higher noise (250µVRMS). | Applicable where enable control is unnecessary and board space permits larger output capacitance. | Choose MCP1700T-3302E/MB only when cost is primary and enable functionality or low noise is not required. |
Compared with TPL720F33 and MCP1700T-3302E/MB, LP3990MF-3.3 offers superior thermal robustness (125°C junction), tighter output tolerance (±1.5%), and lower noise - making it optimal for precision, thermally demanding, or enable-driven portable systems.
Availability
LP3990MF-3.3 is available at Aetrix Electronics and suitable for cellular handsets, wearable trackers, and industrial sensor nodes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LP3990MF-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 leader specializing in analog and embedded processing technologies, with decades of expertise in power management innovation.
The LP3990MF-3.3 belongs to TI's low-noise, low-IQ LDO family engineered specifically for battery-powered digital applications - prioritizing minimal footprint, fast transient response, and guaranteed performance across extreme temperature ranges.
FAQ
What is the maximum input voltage for LP3990MF-3.3?
The absolute maximum input voltage for LP3990MF-3.3 is 6.5V, but the recommended operating range is 2.0V to 6.0V per the datasheet. Exceeding 6.0V may trigger internal protection or reduce reliability. LP3990MF-3.3 is commonly used with 3.3V or 5V sources, and its 120mV dropout enables efficient operation even at low VIN margins.
Does LP3990MF-3.3 require an external bypass capacitor?
No, LP3990MF-3.3 does not require a noise-bypass capacitor - a key design feature confirmed in its official documentation. It achieves low 150µVRMS output noise using internal compensation and stability with only a 1.0µF ceramic output capacitor, simplifying layout and reducing BOM count.
What is the function of the N/C pin on LP3990MF-3.3?
Pin 4 of LP3990MF-3.3 is designated N/C (No Connection) and is internally unconnected. It must remain electrically floating - no trace, pad, or component should be attached. This pin exists for mechanical symmetry in the SOT-23 DBV package and has no electrical role in LP3990MF-3.3 operation.
Can LP3990MF-3.3 operate without any load connected?
Yes, LP3990MF-3.3 remains stable and in regulation with zero load - a documented capability called "no-load stability." This makes LP3990MF-3.3 suitable for applications like CMOS RAM keep-alive circuits or standby power rails where output current may drop to 0µA without risking oscillation or dropout.
What is the thermal shutdown threshold for LP3990MF-3.3?
LP3990MF-3.3 activates thermal shutdown at a junction temperature of 155°C, with 15°C hysteresis to prevent cycling. This protection is internal and automatic - no external components are needed. Once tripped, LP3990MF-3.3 disables output until junction temperature falls below ~140°C, ensuring safe recovery.
LP3990MF-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):
- 6V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.2V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 80 µA
- Current - Supply (Max):
- 120 µA
- PSRR:
- 55dB ~ 35dB (1kHz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LP3990MF-3.3 FAQ
1.How can I place an order for LP3990MF-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3990MF-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 LP3990MF-3.3 reliable?
The price and inventory of LP3990MF-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 LP3990MF-3.3 is usually 5 days.
3.What payment methods are accepted for LP3990MF-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3990MF-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3990MF-3.3?
LP3990MF-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3990MF-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 LP3990MF-3.3?
For technical support, including LP3990MF-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3990MF-3.3 requirements.
6.How does Aetrix verify that LP3990MF-3.3 is sourced from the original manufacturer or authorized distributors?
All LP3990MF-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 LP3990MF-3.3 meets industry standards.
7.What is the process for return or replacement of LP3990MF-3.3?
All LP3990MF-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LP3990MF-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 LP3990MF-3.3 part is unused and in its original packaging.
Return procedure for LP3990MF-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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