My Inquiry
My Account
Texas Instruments LP3990MF-2.8
- Part No.:
- LP3990MF-2.8
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP3990MF-2.8.pdf
- Description:
- IC REG LINEAR 2.8V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,192
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LP3990MF-2.8 from Texas Instruments is a 150mA low-noise linear voltage regulator with fixed 2.8V output, designed for portable digital systems. It operates from 2.0V to 6.0V input, delivers ±1.5% output voltage accuracy over temperature, features logic-controlled enable, and remains stable with only 1.0µF ceramic output capacitance-enabling compact power delivery in cellular handsets and handheld information appliances.
For engineers reviewing the LP3990MF-2.8 datasheet, LP3990MF-2.8 pinout, LP3990MF-2.8 application, or LP3990MF-2.8 equivalent, key selection criteria include its ultra-low 43µA quiescent current (enabled), <10nA shutdown current, 150µVRMS output noise, 55dB PSRR at 1kHz, and fast 105µs startup time-critical for battery-powered digital load regulation where size, efficiency, and noise immunity are constrained.
Technical Context
The LP3990MF-2.8 implements a PMOS pass transistor architecture enabling low dropout (120–200mV at 150mA) and inherent reverse-current blocking. Its internal 1MΩ pulldown on the VEN pin ensures default-disable behavior and simplifies system-level power sequencing without external pull-down resistors.
Stability is guaranteed with 1.0µF ceramic output capacitors (ESR 5–500mΩ), eliminating need for noise-bypass caps or large bulk capacitance. Thermal shutdown (155°C) and short-circuit protection (550–1000mA) provide robust fault handling across −40°C to +125°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±1.5% over −40°C to +125°C - ensures stable core/peripheral rail for 2.8V logic and RF modules. |
| 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 systems. |
| Max Output Current | 150mA - sufficient for low-power microcontrollers, sensors, and interface ICs in space-constrained designs. |
| Quiescent Current | 43µA (enabled), <10nA (disabled) - extends battery life in always-on or sleep-mode applications. |
| Output Noise | 150µVRMS - meets noise-sensitive requirements for ADC references, RF biasing, and audio subsystems. |
| PSRR | 55dB at 1kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Startup Time | 105µs to 95% - enables rapid wake-up from deep-sleep states in portable devices. |
Pinout & Package
SOT-23 package (DBV, 5-pin, 2.92mm × 1.6mm × 1.3mm), RoHS-compliant, lead-free (CU SN finish), MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Common return path for input/output current; must connect to low-impedance analog ground plane. |
| 2 (VIN) | Input supply | Accepts 2.0–6.0V; requires 1.0µF ceramic capacitor placed ≤1cm from pin to minimize input inductance. |
| 3 (VEN) | Enable control | Active-high logic input (VIH = 0.95V, VIL = 0.4V); internal 1MΩ pulldown ensures safe default-off state. |
| 4 (VOUT) | Regulated output | Delivers stable 2.8V; requires 1.0µF ceramic capacitor (X7R recommended) directly at pin for stability. |
| 5 (NC) | No connection | Not internally bonded; must remain unconnected to avoid parasitic coupling or mechanical stress. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with 1.0µF ceramic output cap | Eliminates need for larger tantalum or electrolytic capacitors-reducing board area by >50% vs legacy LDOs. |
| No noise-bypass capacitor required | Reduces BOM count and layout complexity while maintaining 150µVRMS noise performance. |
| Logic-controlled enable with internal pulldown | Enables direct MCU GPIO control without external pull-down resistor-saving PCB real estate and component cost. |
| Virtually zero IQ in shutdown | <10nA shutdown current prevents battery drain during extended storage or system hibernation. |
| Thermal and short-circuit protection | Internally limits power dissipation and output current to prevent damage during overload or ambient overheating. |
Applications
| Cellular Handsets | Hand-Held Information Appliances |
|---|---|
Use Scenario: Powering baseband processor I/O rails and RF front-end bias circuits in slim smartphone designs. IC Role / Device Role / Timing Role: Low-noise post-regulator delivering clean 2.8V supply to sensitive analog blocks adjacent to noisy digital cores. Use Value: 150µVRMS noise and 55dB PSRR prevent signal integrity degradation in GSM/UMTS transceivers and high-speed data interfaces. |
Use Scenario: Supplying display driver ICs and touch controller in battery-operated PDAs and e-readers. IC Role / Device Role / Timing Role: Fixed-output LDO providing regulated 2.8V for display backlight drivers and capacitive touch sensing circuitry. Use Value: 43µA quiescent current and <10nA shutdown current extend battery runtime between charges by minimizing standby leakage. |
| Wearable Health Monitors | IoT Sensor Nodes |
Use Scenario: Powering optical heart-rate sensor ASICs and low-power BLE radio in wrist-worn fitness trackers. IC Role / Device Role / Timing Role: Compact, low-IQ voltage regulator supplying 2.8V to photodiode amplifier and ADC front-end stages. Use Value: Stability with 1.0µF ceramic cap allows integration into ultra-thin form factors where height and footprint are constrained. |
Use Scenario: Regulating power for environmental sensors (temperature/humidity/pressure) and sub-GHz wireless SoCs in remote monitoring nodes. IC Role / Device Role / Timing Role: Always-on LDO maintaining 2.8V rail during deep-sleep cycles while enabling fast wake-up via VEN control. Use Value: 105µs startup time and logic-enable capability support duty-cycled operation essential for multi-year battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL720F28 | Lower IQ (25µA enabled), same 2.8V output, but requires minimum 2.2µF output capacitance and lacks internal VEN pulldown. | Better suited for ultra-low-power sensor nodes where IQ dominates lifetime; less ideal for space-constrained layouts needing minimal COUT. | Select TPL720F28 if <25µA IQ is mandatory and board area allows ≥2.2µF ceramic cap; otherwise LP3990MF-2.8 offers superior size/noise tradeoff. |
| MCP1700T-2802E/MB | Higher dropout (330mV @ 250mA), wider input range (2.3–6.0V), no integrated enable pulldown, and higher noise (250µVRMS). | More tolerant of aging batteries near end-of-discharge; less suitable for noise-critical RF/analog sections. | Choose MCP1700T-2802E/MB for cost-sensitive industrial sensors where noise and footprint are secondary to wide VIN tolerance. |
Compared with TPL720F28 and MCP1700T-2802E/MB, the LP3990MF-2.8 provides the best balance of ultra-low noise (150µVRMS), minimal external components (1.0µF COUT), and built-in safety (thermal/SC protection) in the smallest SOT-23 footprint-making it optimal for portable digital systems demanding precision, compactness, and reliability.
Availability
LP3990MF-2.8 is available at Aetrix Electronics and suitable for cellular handsets, wearable health monitors, and IoT sensor nodes requiring stable component supply with consistent parametric performance and long-term manufacturability.
Supply support for LP3990MF-2.8 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 ICs for portable and industrial applications.
The LP3990 series was engineered specifically for battery-powered digital systems requiring ultra-low noise, minimal quiescent current, and space-efficient regulation-targeting cellular, handheld, and wearable electronics where thermal and EMI constraints are critical.
FAQ
What is the maximum input voltage rating for the LP3990MF-2.8?
The LP3990MF-2.8 has an absolute maximum input voltage of 6.5V, but its specified operating input range is 2.0V to 6.0V. Exceeding 6.0V may compromise long-term reliability or trigger internal protection circuits. The device maintains regulation down to 2.0V input, supporting single-cell Li-ion and alkaline sources. Always observe derating guidelines per thermal conditions in the application.
Does the LP3990MF-2.8 require an external pull-down resistor on the VEN pin?
No-the LP3990MF-2.8 integrates a 1MΩ internal pulldown resistor on the VEN pin, ensuring the regulator remains disabled by default when the enable signal is floating or unconnected. This eliminates the need for an external resistor, reducing BOM count and PCB area. External pull-up is still required to actively enable the device using a logic-high signal ≥0.95V.
Can the LP3990MF-2.8 be used with a 0.47µF output capacitor?
No-the LP3990MF-2.8 is specified and tested for stability with a minimum 1.0µF ceramic output capacitor (X7R/X5R/Z5U, ESR 5–500mΩ). Using 0.47µF violates the recommended design condition and risks oscillation or poor transient response. The datasheet explicitly lists 1.0µF as the nominal and minimum value for guaranteed stability across temperature and load.
What is the typical dropout voltage of the LP3990MF-2.8 at full load?
The LP3990MF-2.8 exhibits a typical dropout voltage of 120mV at 150mA load current and 25°C junction temperature. The maximum dropout is 200mV across −40°C to +125°C. This low dropout enables operation with input voltages as low as 2.92V while sustaining 2.8V output-critical for extending runtime in battery-powered systems nearing end-of-discharge.
Is the LP3990MF-2.8 compatible with lead-free reflow processes?
Yes-the LP3990MF-2.8/NOPB variant is RoHS-compliant and qualified for lead-free reflow with MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH). Its peak reflow temperature is rated to 260°C, matching standard Pb-free solder profiles. The CU SN (copper-tin) lead finish ensures compatibility with no-clean and water-soluble flux chemistries.
LP3990MF-2.8 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):
- 2.8V
- 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-2.8 FAQ
1.How can I place an order for LP3990MF-2.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3990MF-2.8 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-2.8 reliable?
The price and inventory of LP3990MF-2.8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3990MF-2.8 is usually 5 days.
3.What payment methods are accepted for LP3990MF-2.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3990MF-2.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3990MF-2.8?
LP3990MF-2.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3990MF-2.8 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-2.8?
For technical support, including LP3990MF-2.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3990MF-2.8 requirements.
6.How does Aetrix verify that LP3990MF-2.8 is sourced from the original manufacturer or authorized distributors?
All LP3990MF-2.8 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-2.8 meets industry standards.
7.What is the process for return or replacement of LP3990MF-2.8?
All LP3990MF-2.8 units undergo pre-shipment inspection (PSI). If there is an issue with LP3990MF-2.8, 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-2.8 part is unused and in its original packaging.
Return procedure for LP3990MF-2.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP3990MF-2.8 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
