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Texas Instruments LP3990SD-2.5/NOPB
- Part No.:
- LP3990SD-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LP3990SD-2.5/NOPB.pdf
- Description:
- IC REG LINEAR 2.5V 150MA 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,353
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Product details
Overview
LP3990SD-2.5/NOPB from Texas Instruments (formerly National Semiconductor) is a 150mA low-noise linear voltage regulator delivering a fixed 2.5V output with ±1.5% tolerance over −40°C to +125°C, 2.0–6.0V input range, and 43µA quiescent current in active mode. It features logic-controlled enable, thermal/short-circuit protection, and stability with 1.0µF ceramic output capacitors - designed for space-constrained digital power rails in portable electronics.
For engineers reviewing the LP3990SD-2.5/NOPB datasheet, LP3990SD-2.5/NOPB pinout, LP3990SD-2.5/NOPB application, or LP3990SD-2.5/NOPB equivalent, key selection criteria include dropout voltage (200mV max at 150mA), PSRR (55dB @ 1kHz), fast startup (105µs), low noise (150µVRMS), and LLP-6 package compatibility with SOT23 footprint.
Technical Context
The LP3990SD-2.5/NOPB uses a PMOS pass transistor architecture enabling ultra-low dropout and near-zero shutdown current (<10nA). Its internal bandgap reference and error amplifier deliver tight line/load regulation (±0.1%/V and ±0.005%/mA) across temperature and load.
Designed for battery-powered systems, it integrates an enable input with 1MΩ pulldown resistor, defined VIH/VIL thresholds (0.95V/0.4V), and robust transient response (≤100mV pk-pk under 1mA→150mA load step with 1µF COUT).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±1.5% over full temperature and load range - ensures stable core I/O supply for ASICs/FPGAs. |
| Max Output Current | 150mA continuous - supports low-power microcontrollers, sensors, and RF front-end biasing. |
| Dropout Voltage | 200mV max at 150mA - enables operation from single-cell Li-ion (3.0V min) or two-cell alkaline (3.2V min) with margin. |
| Quiescent Current | 43µA typical (enabled), <10nA (disabled) - extends battery life in always-on standby modes. |
| PSRR | 55dB @ 1kHz - suppresses switching noise from upstream DC/DC converters feeding the input rail. |
| Output Noise | 150µVRMS (10Hz–100kHz) - suitable for noise-sensitive analog circuits like ADC references or RF synthesizers. |
| Startup Time | 105µs to 95% VOUT - meets fast wake-up timing requirements in portable system power sequencing. |
Pinout & Package
LP3990SD-2.5/NOPB is housed in a lead-free LLP-6 (Leadless Leadframe Package) with SOT23 footprint, measuring 2.0mm × 2.1mm × 0.8mm and rated for θJA = 88°C/W. The package features exposed thermal pad for enhanced heat dissipation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 2.0–6.0V; requires 1.0µF ceramic capacitor placed ≤1cm from pin to minimize input inductance. |
| GND | Power ground reference | Common return path for input/output capacitors and load; must connect to thermal pad for optimal thermal performance. |
| VOUT | Regulated output | Delivers fixed 2.5V; requires 1.0µF ceramic capacitor (ESR 5–500mΩ) directly at pin for stability. |
| VEN | Enable control input | Active-high logic interface (VIH ≥ 0.95V, VIL ≤ 0.4V); internal 1MΩ pulldown ensures default-off state. |
| N/C | No connection | Unbonded terminal; must remain floating - no PCB trace or solder mask opening required. |
| N/C | No connection | Unbonded terminal; must remain floating - no PCB trace or solder mask opening required. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with 1.0µF ceramic output capacitor | Eliminates need for larger tantalum or electrolytic caps - reduces board area by >50% vs legacy LDOs. |
| 1% initial voltage accuracy (room temp) | Ensures precise voltage delivery without external trimming - critical for memory I/O and sensor biasing. |
| No noise bypass capacitor required | Simplifies BOM and layout - internal compensation avoids extra 10nF capacitor typically needed for noise filtering. |
| Thermal-overload and short-circuit protection | Auto-recovery shutdown prevents damage during fault conditions - enables robust field deployment. |
| Logic-controlled enable with pulldown resistor | Reduces external component count - eliminates need for pull-down resistor on host MCU GPIO lines. |
Applications
| Smartphone Baseband Power | Wearable Sensor Hub |
|---|---|
Use Scenario: Powers baseband processor I/O banks requiring clean, stable 2.5V supply during cellular transmit bursts. IC Role / Device Role / Timing Role: Low-noise post-regulator supplying voltage to high-speed digital interfaces (e.g., MIPI D-PHY). Use Value: 150µVRMS noise and 55dB PSRR prevent bit errors caused by switching noise coupling into data lanes. |
Use Scenario: Supplies 2.5V to MEMS accelerometer/gyroscope and BLE radio in ultra-thin fitness trackers. IC Role / Device Role / Timing Role: Primary LDO for mixed-signal sensor subsystem with dynamic enable control during motion detection cycles. Use Value: 43µA quiescent current and <10nA shutdown current extend coin-cell battery life to >12 months in intermittent-sensing mode. |
| Industrial Handheld Terminal | Medical Point-of-Care Monitor |
Use Scenario: Provides regulated 2.5V for barcode scanner ASIC and touchscreen controller in ruggedized handhelds. IC Role / Device Role / Timing Role: Input-stable LDO supporting wide VIN range (2.0–6.0V) across primary battery and USB charging inputs. Use Value: 200mV dropout enables full 150mA output even as Li-ion discharges to 2.7V - maintains functionality until end-of-life. |
Use Scenario: Delivers 2.5V to precision analog front-end (AFE) and low-power display driver in portable ECG monitors. IC Role / Device Role / Timing Role: Low-drift, low-noise voltage source for ADC reference and op-amp biasing in clinical-grade signal chain. Use Value: ±1.5% output tolerance over −40°C to +125°C ensures consistent measurement accuracy across operating environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL720F25-DBVR | 200mA output, 25µA IQ, 120mV dropout, same 2.5V fixed output, SOT-23-5 package | Higher current and lower dropout suit higher-power peripherals; smaller SOT-23-5 footprint but no thermal pad | Select when board space is constrained and thermal load is light; verify PSRR (45dB @ 1kHz) meets noise requirements. |
| MCP1700T-2502E/TT | 250mA output, 1.8µA IQ (enabled), 600mV dropout, 2.5V fixed, SOT-23-3 package | Ultra-low IQ ideal for multi-year battery life; higher dropout limits use with low-VIN sources like coin cells | Choose for energy-harvesting or long-life IoT nodes where 150mA peak load is rare and input voltage ≥3.1V. |
Compared with LP3990SD-2.5/NOPB, TPL720F25-DBVR offers higher current and better thermal performance in a smaller footprint but trades 10dB PSRR; MCP1700T-2502E/TT delivers dramatically lower quiescent current but sacrifices dropout and noise performance - making LP3990SD-2.5/NOPB optimal for balanced noise/current/thermal requirements in portable digital systems.
Availability
LP3990SD-2.5/NOPB is available at Aetrix Electronics and suitable for smartphone baseband power, wearable sensor hubs, industrial handheld terminals, medical point-of-care monitors, and other applications requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for LP3990SD-2.5/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 acquired National Semiconductor in 2011 and maintains its precision analog and power management portfolio with rigorous quality and longevity commitments.
The LP3990SD-2.5/NOPB belongs to TI's low-noise LDO family engineered for portable digital systems - emphasizing minimal board area, battery efficiency, and noise immunity in space- and power-constrained designs.
FAQ
What is the maximum input voltage rating for LP3990SD-2.5/NOPB?
The absolute maximum input voltage for LP3990SD-2.5/NOPB is 6.5V, but the recommended operating range is 2.0V to 6.0V. Exceeding 6.0V risks violating safe operating area limits, especially under high ambient temperatures or heavy load. For reliable long-term operation, maintain VIN ≤ 6.0V with appropriate derating per thermal conditions.
Does LP3990SD-2.5/NOPB require an external pull-down resistor on the enable pin?
No - LP3990SD-2.5/NOPB integrates a 1MΩ internal pulldown resistor on the VEN pin, ensuring default-disabled operation when left unconnected. Adding an external pull-down is unnecessary and may increase leakage current; tie VEN directly to VIN only if permanent enable is required.
Can LP3990SD-2.5/NOPB operate stably with a 0.47µF output capacitor?
No - LP3990SD-2.5/NOPB requires a minimum 0.7µF output capacitance (1.0µF recommended) with ESR between 5mΩ and 500mΩ for guaranteed stability. Using 0.47µF risks oscillation or poor transient response; X7R ceramic capacitors in 0603 or larger case sizes meet both capacitance and ESR specs reliably.
What is the thermal resistance (θJA) of LP3990SD-2.5/NOPB in its LLP-6 package?
The junction-to-ambient thermal resistance (θJA) for LP3990SD-2.5/NOPB in the LLP-6 package is 88°C/W under standard JEDEC PCB conditions (2s2p copper). Actual θJA depends on PCB layout - using the exposed thermal pad with ≥4 thermal vias to inner ground planes reduces effective θJA by up to 30%, critical for sustained 150mA operation.
Is LP3990SD-2.5/NOPB compatible with lead-free reflow profiles?
Yes - LP3990SD-2.5/NOPB is qualified for lead-free assembly with a peak reflow temperature of 260°C (per J-STD-020). The LLP-6 package supports standard Pb-free soldering processes; ensure thermal pad solder paste coverage ≥80% and reflow profile includes adequate soak time to prevent voiding under the pad.
LP3990SD-2.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- 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):
- 2.5V
- 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:
- 6-WSON (3x3)
LP3990SD-2.5/NOPB FAQ
1.How can I place an order for LP3990SD-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3990SD-2.5/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 LP3990SD-2.5/NOPB reliable?
The price and inventory of LP3990SD-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3990SD-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LP3990SD-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3990SD-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3990SD-2.5/NOPB?
LP3990SD-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3990SD-2.5/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 LP3990SD-2.5/NOPB?
For technical support, including LP3990SD-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3990SD-2.5/NOPB requirements.
6.How does Aetrix verify that LP3990SD-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3990SD-2.5/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 LP3990SD-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LP3990SD-2.5/NOPB?
All LP3990SD-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3990SD-2.5/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 LP3990SD-2.5/NOPB part is unused and in its original packaging.
Return procedure for LP3990SD-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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