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Texas Instruments LP3990MF-2.5
- Part No.:
- LP3990MF-2.5
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP3990MF-2.5.pdf
- Description:
- IC REG LINEAR 2.5V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,710
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Product details
Overview
LP3990MF-2.5 from Texas Instruments is a 150-mA, 2.5-V fixed-output linear voltage regulator in SOT-23-5 package, designed for portable digital systems. It delivers ±1.5% output voltage accuracy over full load and temperature (–40°C to 125°C), operates from 2 V to 6 V input, consumes only 43 µA quiescent current when enabled, and achieves 105 µs start-up time - enabling stable power for low-power microcontrollers and RF ICs in battery-powered handsets.
For engineers reviewing the LP3990MF-2.5 datasheet, LP3990MF-2.5 pinout, LP3990MF-2.5 application, or LP3990MF-2.5 equivalent, key selection criteria include dropout voltage (200 mV at 150 mA), ceramic capacitor compatibility (1 µF min COUT), logic-controlled enable with internal 1-MΩ pull-down, thermal shutdown (155°C), and PSRR of 55 dB at 1 kHz - all critical for noise-sensitive digital supply rails.
Technical Context
The LP3990MF-2.5 integrates a precision bandgap reference, error amplifier, and PMOS pass transistor in a single-stage LDO architecture. Its enable control uses an active-high EN pin with defined VIH (0.95 V) and VIL (0.4 V) thresholds, internally pulled down to GND via 1-MΩ resistor - ensuring default-off behavior and deterministic startup sequencing.
Stability is achieved with minimal external components: only 1 µF ceramic input and output capacitors are required, with no bypass capacitor needed. The regulator maintains regulation down to zero load and includes thermal overload protection that disables output at ~155°C junction temperature, with ~15°C hysteresis for safe recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±1.5% over full line, load, and –40°C to 125°C range - ensures consistent core voltage for 2.5-V logic and analog peripherals. |
| Max Output Current | 150 mA continuous - sufficient for powering single-core MCUs, sensors, or RF transceivers without thermal derating in SOT-23-5. |
| Input Voltage Range | 2 V to 6 V - supports single-cell Li-ion (3.0–4.2 V), dual-cell alkaline (2.4–3.2 V), and USB-powered (5 V) systems. |
| Quiescent Current | 43 µA (enabled), <10 nA (disabled) - extends battery life in always-on monitoring or sleep-mode applications. |
| Dropout Voltage | 200 mV at 150 mA - enables operation down to 2.7 V input while maintaining 2.5 V output, critical for brownout resilience. |
| PSRR | 55 dB at 1 kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Output Noise | 150 µVRMS (10 Hz–100 kHz) - suitable for noise-sensitive analog circuits like ADC references or RF synthesizers. |
| Start-Up Time | 105 µs to 95% of 2.5 V - meets fast wake-up timing requirements for low-power microcontrollers exiting deep-sleep mode. |
Pinout & Package
SOT-23-5 package (3.00 mm × 3.00 mm), thermally enhanced with exposed pad connected to GND. Pin 1 = IN, Pin 2 = GND, Pin 3 = EN, Pin 4 = N/C, Pin 5 = OUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Power input | Accepts 2–6 V supply; requires 1-µF ceramic capacitor within 1 cm for stability and transient response. |
| 2 (GND) | Ground reference | Common return path for input/output capacitors and load; must connect directly to low-impedance ground plane. |
| 3 (EN) | Enable control | Active-high logic input; 0.95 V threshold enables regulator; internal 1-MΩ pull-down ensures safe default-OFF state. |
| 4 (N/C) | No internal connection | Unbonded pin - must remain unconnected; no routing or soldering required. |
| 5 (OUT) | Regulated output | Delivers stable 2.5 V; connects directly to load and 1-µF ceramic capacitor; sensitive to PCB trace inductance. |
Key Features
| Feature | Design Value |
|---|---|
| 1-µF ceramic capacitor stability | Eliminates need for large tantalum or electrolytic capacitors - reduces board area by >50% vs legacy LDOs. |
| No noise bypass capacitor required | Integrated noise filtering enables clean 2.5-V rail for precision analog circuits without extra BOM cost or layout complexity. |
| Virtually zero IQ in shutdown | <10 nA disable current prevents battery drain in long-term storage or emergency-off states. |
| Thermal-overload and short-circuit protection | Auto-recovering shutdown at 155°C junction temperature protects device and system during fault conditions. |
| Logic-controlled enable with pull-down | Guarantees known OFF state on power-up; simplifies host MCU GPIO management and eliminates external pull-down resistors. |
| Low output noise (150 µVRMS) | Meets stringent noise requirements for high-resolution ADCs, PLLs, and RF front-end bias supplies. |
Applications
| Cellular Handset Baseband | Wearable Sensor Hub |
|---|---|
|
Use Scenario: Powering ARM Cortex-M0+ MCU and BLE radio in compact wearable handset form factor. IC Role / Device Role: Primary 2.5-V supply for digital core and RF interface, replacing higher-IQ regulators. Use Value: 43 µA quiescent current extends battery runtime by >30% vs comparable LDOs; 105 µs start-up enables sub-200 µs wake-from-sleep latency. |
Use Scenario: Providing regulated 2.5-V rail to MEMS accelerometer, gyroscope, and ultra-low-power MCU in fitness tracker. IC Role / Device Role: Low-noise, low-IQ power source for mixed-signal sensor signal chain and digital logic. Use Value: 150 µVRMS output noise prevents degradation of 16-bit sensor ADC performance; 1-µF ceramic support minimizes footprint in 3×3 mm PCB area. |
| Industrial IoT Edge Node | Portable Medical Monitor |
|
Use Scenario: Supplying 2.5-V reference and logic voltage to LoRaWAN transceiver and environmental sensor array in battery-operated gateway. IC Role / Device Role: Stable, low-noise auxiliary regulator fed from primary buck converter. Use Value: 55 dB PSRR at 1 kHz rejects switching ripple from upstream DC/DC, ensuring reliable packet transmission under dynamic load. |
Use Scenario: Powering ECG analog front-end and display controller in handheld patient monitor with 7-day battery life target. IC Role / Device Role: Precision 2.5-V supply for op-amp biasing and ADC reference, isolated from noisy digital domains. Use Value: ±1.5% output tolerance over –40°C to 125°C guarantees clinical-grade measurement accuracy across operating temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LPGEDR | 7-channel 200-mA sink driver with integrated 2.5-V LDO; higher IQ (120 µA), no EN pin, WSON-16 package. | Designed for LED/display driver integration; not a standalone regulator - lacks independent enable and low-noise optimization. | Select only if driving high-side loads concurrently; otherwise, LP3990MF-2.5 offers superior noise, enable control, and footprint efficiency. |
| MCP1700T-2502E/TT | 250-mA LDO with 2.5-V output, 1.6-µA IQ (enabled), but requires ≥2.7-V input and 2.2-µF output capacitor. | Better quiescent current but higher minimum input voltage and larger capacitor requirement limit use in single-cell Li-ion systems. | Prefer LP3990MF-2.5 for 2-V input capability and 1-µF ceramic compatibility; choose MCP1700 only for ultra-low-IQ priority in >2.7-V systems. |
Compared with TPL7407LPGEDR and MCP1700T-2502E/TT, the LP3990MF-2.5 uniquely balances 2-V input support, 1-µF ceramic stability, 43-µA IQ, and 150-µVRMS noise - making it optimal for space-constrained, battery-powered digital systems requiring fast, clean, and predictable power-up behavior.
Availability
LP3990MF-2.5 is available at Aetrix Electronics and suitable for cellular handsets, wearable sensor hubs, industrial IoT edge nodes, portable medical monitors, and battery-powered instrumentation requiring stable component supply and long-lifecycle support.
Supply support for LP3990MF-2.5 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, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LP3990MF-2.5 belongs to TI's LP39xx family of ultra-low-noise, low-IQ linear regulators targeting portable digital applications - engineered specifically for stable operation with miniature ceramic capacitors and deterministic enable control in space- and power-constrained designs.
FAQ
What is the minimum input voltage required for LP3990MF-2.5 to regulate 2.5 V output?
The LP3990MF-2.5 requires a minimum input voltage of 2 V, but to maintain regulation at full 150-mA load, VIN must be at least VOUT + VDO = 2.5 V + 0.2 V = 2.7 V. Below 2.7 V, output voltage drops proportionally with input; datasheet specifies guaranteed regulation only above 2.7 V at rated load. At light loads (<1 mA), regulation holds down to 2.5 V input.
Can LP3990MF-2.5 operate without an enable signal connected?
Yes - the LP3990MF-2.5 has an internal 1-MΩ pull-down resistor on the EN pin, so leaving EN unconnected defaults the device to disabled state with <10 nA supply current. To enable operation, EN must be driven to ≥0.95 V; tying EN to VIN is acceptable for permanent-on applications.
Is a bypass capacitor required for LP3990MF-2.5 to achieve specified noise performance?
No - the LP3990MF-2.5 is explicitly designed with integrated noise filtering and does not require an external noise bypass capacitor. Its 150 µVRMS output noise (10 Hz–100 kHz) is achieved using only the recommended 1-µF ceramic output capacitor, as verified in TI's SNVS251J datasheet Section 6.5.
What ceramic capacitor characteristics are mandatory for stable LP3990MF-2.5 operation?
LP3990MF-2.5 requires a 1-µF ceramic output capacitor with ESR between 5 mΩ and 500 mΩ, and temperature coefficient X7R or X5R for stable operation across –40°C to 125°C. Z5U/Y5V types are discouraged due to >50% capacitance loss at temperature extremes, risking instability.
Does LP3990MF-2.5 support zero-load (no-output-current) regulation?
Yes - the LP3990MF-2.5 remains stable and maintains 2.5 V output regulation with zero load current, as confirmed in Section 8.2.2.5 ("No-Load Stability") of the SNVS251J datasheet. This is essential for applications like CMOS RAM keep-alive or standby biasing where load current may drop to zero.
LP3990MF-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 2.5V
- 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-2.5 FAQ
1.How can I place an order for LP3990MF-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3990MF-2.5 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-2.5 reliable?
The price and inventory of LP3990MF-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3990MF-2.5 is usually 5 days.
3.What payment methods are accepted for LP3990MF-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3990MF-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3990MF-2.5?
LP3990MF-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3990MF-2.5 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-2.5?
For technical support, including LP3990MF-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3990MF-2.5 requirements.
6.How does Aetrix verify that LP3990MF-2.5 is sourced from the original manufacturer or authorized distributors?
All LP3990MF-2.5 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-2.5 meets industry standards.
7.What is the process for return or replacement of LP3990MF-2.5?
All LP3990MF-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LP3990MF-2.5, 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-2.5 part is unused and in its original packaging.
Return procedure for LP3990MF-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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