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Texas Instruments LP3990MF-1.2
- Part No.:
- LP3990MF-1.2
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP3990MF-1.2.pdf
- Description:
- IC REG LINEAR 1.2V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,105
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Product details
Overview
LP3990MF-1.2 from Texas Instruments is a 150mA low-noise linear voltage regulator delivering a fixed 1.2V output with ±1.5% tolerance over temperature, stable with 1.0µF ceramic capacitors, and featuring logic-controlled enable for battery-powered digital systems such as cellular handsets and handheld information appliances.
For engineers reviewing the LP3990MF-1.2 datasheet, LP3990MF-1.2 pinout, LP3990MF-1.2 application, or LP3990MF-1.2 equivalent, key selection criteria include its 43µA quiescent current in active mode, <10nA shutdown current, 150µVRMS output noise, 55dB PSRR at 1kHz, and SOT-23-5 package compatibility with space-constrained portable designs.
Technical Context
The LP3990MF-1.2 employs a PMOS pass transistor architecture enabling ultra-low dropout (120mV typical at 150mA) and eliminating the need for a noise-bypass capacitor. Its internal 1MΩ pulldown on the VEN pin ensures reliable disable behavior without external components.
Specified for −40°C to +125°C junction operation, it maintains regulation across 2.0V–6.0V input range and delivers fast 105µs startup time to 95% of VOUT. Thermal shutdown (155°C) and short-circuit protection (550–1000mA) provide robust fault handling in embedded portable applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2V ±1.5% over −40°C to +125°C - ensures stable core/logic rail for low-voltage microcontrollers and RF ICs. |
| Max Output Current | 150mA - sufficient for powering single-core processors, memory, and peripheral ICs in compact portable devices. |
| Quiescent Current | 43µA (enabled), <10nA (disabled) - extends battery life in always-on or sleep-mode subsystems. |
| Dropout Voltage | 120mV (typ) at 150mA - enables operation down to VIN = 1.32V, critical for single-cell Li-ion or Li-poly systems. |
| Output Noise | 150µVRMS - low enough for noise-sensitive analog sections (e.g., ADC references, RF synthesizers) without additional filtering. |
| PSRR | 55dB at 1kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Stability | Guaranteed with 1.0µF ceramic output capacitor (ESR 5–500mΩ) - eliminates need for larger, costlier tantalum or electrolytic caps. |
Pinout & Package
LP3990MF-1.2 is packaged in a RoHS-compliant, lead-free SOT-23-5 (DBV) package measuring 2.9mm × 1.6mm × 1.15mm, optimized for high-density PCB layouts in handheld electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Power ground reference | Must be connected directly to low-impedance system ground plane; serves as return path for load and quiescent current. |
| 2 - VOUT | Regulated output terminal | Delivers 1.2V to load; requires 1.0µF ceramic capacitor placed within 1cm for stability and transient response. |
| 3 - NC | No connection | Internally unconnected; must remain floating - no routing or soldering permitted. |
| 4 - VEN | Active-high enable control | Pulled up to ≥0.95V to activate regulator; ≤0.4V disables output and reduces IQ to <10nA; includes 1MΩ internal pulldown. |
| 5 - VIN | Input power supply | Accepts 2.0–6.0V; requires 1.0µF ceramic capacitor placed near pin to minimize input inductance and ensure stability. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 1.2V output | Eliminates external resistor network, reducing BOM count and layout area while ensuring precise voltage for 1.2V I/O or core rails. |
| 150mA output capability | Supports moderate-current loads like Bluetooth SoCs, sensor hubs, or display drivers without thermal derating in SOT-23. |
| 150µVRMS output noise | Enables direct use in noise-sensitive analog signal chains (e.g., audio codecs, precision ADCs) without post-regulation filtering. |
| Logic-controlled enable | Allows system-level power sequencing and dynamic power gating via GPIO, reducing standby power in multi-rail architectures. |
| Thermal and short-circuit protection | Prevents catastrophic failure during overload or poor heatsinking, supporting robust field reliability in unattended portable devices. |
Applications
| Cellular Handsets | Hand-Held Information Appliances |
|---|---|
Use Scenario: Powering baseband processor I/O banks and RF transceiver bias rails in slim smartphone designs. IC Role / Device Role / Timing Role: Low-noise, fast-startup LDO supplying clean 1.2V to sensitive analog/RF circuitry adjacent to noisy digital blocks. Use Value: 150µVRMS noise and 55dB PSRR prevent AM modulation of RF carriers; 105µs startup enables rapid wake-from-sleep transitions. |
Use Scenario: Regulating power for touch controller, flash memory interface, and display driver in ruggedized PDAs. IC Role / Device Role / Timing Role: Primary 1.2V supply for mixed-signal ASICs requiring stable voltage under variable load and temperature. Use Value: ±1.5% output accuracy over −40°C to +125°C ensures timing margin compliance; 43µA IQ extends battery runtime between charges. |
| Wearable Health Monitors | IoT Edge Sensor Nodes |
Use Scenario: Supplying ECG/PPG analog front-end and low-power MCU in compact wearable patches. IC Role / Device Role / Timing Role: Ultra-low-IQ LDO providing quiet 1.2V rail for precision biopotential amplifiers and ADC references. Use Value: <10nA shutdown current preserves coin-cell battery life during extended idle periods; 1.0µF ceramic stability minimizes board area. |
Use Scenario: Powering LoRa/Wi-Fi transceivers and environmental sensors in battery-operated smart agriculture nodes. IC Role / Device Role / Timing Role: Enable-controlled LDO managing power to RF section only during transmission bursts. Use Value: Logic-enable allows host MCU to gate LP3990MF-1.2 power, cutting system standby current by >99% versus always-on regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL720F12 | 150mA, 1.2V fixed, 25µA IQ (enabled), 10nA shutdown, WSON-6 package | Lower quiescent current but requires 2.2µF output cap; not pin-compatible with SOT-23-5 | Preferred when ultra-low IQ dominates design priority and board space allows WSON-6 footprint. |
| MCP1700T-1202E/MB | 250mA, 1.2V fixed, 1.6µA IQ (enabled), 500nA shutdown, SOT-23-3 package | No enable pin; 3-pin package limits control flexibility; higher max current but lower PSRR (45dB) | Selected for cost-sensitive, always-on applications where enable functionality is unnecessary and lower IQ is critical. |
Compared with TPL720F12 and MCP1700T-1202E/MB, the LP3990MF-1.2 offers superior PSRR (55dB vs. ≤45dB) and proven 1.0µF ceramic stability in SOT-23-5, making it optimal for noise-sensitive, enable-controlled portable systems where footprint and capacitor size are constrained.
Availability
LP3990MF-1.2 is available at Aetrix Electronics and suitable for cellular handsets, handheld information appliances, and wearable health monitors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LP3990MF-1.2 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 headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with broad industrial, automotive, and consumer market reach.
The LP3990MF-1.2 belongs to TI's LP3990 family of low-noise, low-IQ LDOs designed specifically for portable battery-powered digital systems demanding high accuracy, small footprint, and ceramic-capacitor compatibility.
FAQ
What is the maximum input voltage rating for LP3990MF-1.2?
The LP3990MF-1.2 has an absolute maximum input voltage of 6.5V, but its recommended operating input range is 2.0V to 6.0V per the datasheet. Exceeding 6.0V may compromise long-term reliability or trigger internal protection circuits. The device is commonly used with single-cell Li-ion (up to 4.2V) or dual-cell alkaline (up to 3.2V) sources, and its 120mV dropout enables efficient operation even at low VIN.
Does LP3990MF-1.2 require an external pull-up resistor on the VEN pin?
No, LP3990MF-1.2 does not require an external pull-up resistor on the VEN pin because it integrates a 1MΩ internal pulldown resistor to GND. When left unconnected, VEN defaults to logic-low, disabling the regulator. To enable, drive VEN to ≥0.95V using a GPIO or logic signal - no external components are needed for basic enable/disable control.
Can LP3990MF-1.2 operate stably with a 0.47µF output capacitor?
No - the LP3990MF-1.2 is specified and guaranteed stable only with a minimum 1.0µF ceramic output capacitor (ESR 5–500mΩ). While some lab tests may show marginal stability with 0.47µF, the datasheet explicitly recommends 1.0µF for production designs to ensure robust performance across temperature, process variation, and load transients. Using 0.47µF risks oscillation or degraded PSRR.
What is the thermal resistance (θJA) of the LP3990MF-1.2 in its SOT-23-5 package?
The LP3990MF-1.2 in the SOT-23-5 (DBV) package has a junction-to-ambient thermal resistance (θJA) of 220°C/W, as documented in the Thermal Properties table. This value assumes standard JEDEC 2-layer test board conditions; actual θJA in end equipment depends heavily on PCB copper area, vias to inner layers, and airflow. For 150mA loads at 6V input, thermal design must verify junction temperature remains ≤125°C.
Is LP3990MF-1.2 compatible with lead-free reflow processes?
Yes - LP3990MF-1.2/NOPB is qualified for lead-free reflow with a Moisture Sensitivity Level (MSL) rating of Level-1 at 260°C peak temperature, per JEDEC J-STD-020. It uses Cu-Sn lead finish and complies with RoHS and TI's Green (no Sb/Br) eco-plan, making it suitable for standard Pb-free assembly lines without special handling or baking requirements.
LP3990MF-1.2 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):
- 1.2V
- 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-1.2 FAQ
1.How can I place an order for LP3990MF-1.2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3990MF-1.2 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-1.2 reliable?
The price and inventory of LP3990MF-1.2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3990MF-1.2 is usually 5 days.
3.What payment methods are accepted for LP3990MF-1.2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3990MF-1.2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3990MF-1.2?
LP3990MF-1.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3990MF-1.2 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-1.2?
For technical support, including LP3990MF-1.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3990MF-1.2 requirements.
6.How does Aetrix verify that LP3990MF-1.2 is sourced from the original manufacturer or authorized distributors?
All LP3990MF-1.2 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-1.2 meets industry standards.
7.What is the process for return or replacement of LP3990MF-1.2?
All LP3990MF-1.2 units undergo pre-shipment inspection (PSI). If there is an issue with LP3990MF-1.2, 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-1.2 part is unused and in its original packaging.
Return procedure for LP3990MF-1.2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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