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Texas Instruments LP3991TLX-2.5/NOPB
- Part No.:
- LP3991TLX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 4-WFBGA, DSBGA
- Datasheet:
-
LP3991TLX-2.5/NOPB.pdf
- Description:
- IC REG LINEAR 2.5V 300MA 4DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,768
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Product details
Overview
LP3991TLX-2.5/NOPB from Texas Instruments is a fixed-output 2.5 V, 300-mA low-dropout linear regulator in a 4-pin DSBGA package, designed for post-DC/DC regulation in space-constrained digital systems. It operates from 1.65 V to 4 V input, delivers ±1% output accuracy at room temperature, maintains 125-mV dropout at full load, and draws only 50 µA quiescent current at 1 mA load - enabling high-efficiency power management in battery-powered handheld devices.
For engineers reviewing the LP3991TLX-2.5/NOPB datasheet, LP3991TLX-2.5/NOPB pinout, LP3991TLX-2.5/NOPB application, or LP3991TLX-2.5/NOPB equivalent, key selection criteria include its 2.5 V fixed output, DSBGA-4 (1.43 mm × 0.96 mm) footprint, ceramic-capacitor stability down to 0402 size, 65 dB PSRR at 1 kHz, and enable-controlled shutdown with 2 nA off-state current.
Technical Context
The LP3991TLX-2.5/NOPB integrates a PMOS pass element with internal thermal overload and short-circuit protection, supporting operation across –40°C to +125°C junction temperature. Its EN pin features an internal 1.2-MΩ pulldown resistor and logic-level thresholds (VIH = 0.95 V, VIL = 0.4 V), enabling direct interface with low-voltage GPIOs.
Designed specifically for post-buck applications, it eliminates switching noise from upstream DC-DC converters without requiring a separate input capacitor - sharing the buck converter's output capacitor - while maintaining ≥70% system efficiency over Li-ion battery voltage range. Output stability is guaranteed with 4.7 µF X7R/X5R ceramic capacitors (ESR 5–500 mΩ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±1% at 25°C; ensures precise core/sensor rail compliance in digital SoC subsystems. |
| Max Output Current | 300 mA continuous; supports moderate-power digital loads such as microcontrollers, FPGAs, and interface ICs. |
| Dropout Voltage | 125 mV at 300 mA; enables regulation down to VIN = 2.625 V, minimizing power loss in low-VIN scenarios. |
| Quiescent Current | 50 µA at 1 mA load; extends battery life in always-on or low-duty-cycle portable applications. |
| PSRR | 65 dB at 1 kHz; suppresses ripple and noise from upstream switching regulators, improving signal integrity. |
| Start-Up Time | 100 µs to 95% of 2.5 V (VIN ≤ 3.6 V); meets fast wake-up timing requirements in responsive embedded systems. |
| Output Noise | 280 µVRMS (10 Hz–100 kHz); suitable for noise-sensitive analog peripherals like ADCs and RF front-ends. |
Pinout & Package
LP3991TLX-2.5/NOPB uses a 4-pin DSBGA (YZR) package with nominal body size 1.43 mm × 0.96 mm and 0.5-mm pitch. The package is optimized for minimal PCB area and thermal performance via direct die-to-PCB conduction through four solder bumps.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | GND | Power ground reference; must be connected to a low-impedance PCB ground plane or thermal pad for stability and thermal dissipation. |
| A2 | EN | Active-high enable input; internal 1.2-MΩ pulldown ensures safe default-off state; requires ≥0.95 V to activate regulator. |
| B1 | OUT | Regulated 2.5 V output; connects directly to load; requires 4.7 µF ceramic capacitor (X7R/X5R, ESR 5–500 mΩ) to GND within 1 cm. |
| B2 | IN | Input supply pin; accepts 1.65–4 V; requires 1 µF ceramic capacitor to GND placed ≤1 cm away for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Inrush current limiting | Clamped to 600 mA max during start-up, preventing input rail collapse and protecting upstream power sources. |
| Ceramic capacitor compatibility | Stable with 0402-size 4.7 µF X7R/X5R ceramics - reduces board area by >50% vs. larger case sizes or tantalum alternatives. |
| Thermal & short-circuit protection | Integrated shutdown at 160°C junction temperature with 20°C hysteresis; limits short-circuit current to 550–900 mA. |
| No-load regulation | Maintains 2.5 V output with zero load current - essential for CMOS RAM keep-alive and standby power domains. |
| Low-noise operation | 280 µVRMS output noise (10 Hz–100 kHz) enables clean power delivery to precision analog circuits without external filtering. |
Applications
| Mobile Baseband Processor Power | Wearable Sensor Hub Supply |
|---|---|
|
Use Scenario: Powers ARM Cortex-A/M series baseband processors in smartphones after a 3.3 V buck converter. IC Role / Device Role / Timing Role: Post-regulator providing ultra-low-noise 2.5 V core rail; replaces bulkier LDOs with higher dropout and quiescent current. Use Value: Reduces system EMI by >15 dB and extends battery runtime by 8–12% versus legacy LDOs, due to 125-mV dropout and 50-µA IQ. |
Use Scenario: Supplies 2.5 V to MEMS accelerometers, gyroscopes, and BLE radio in compact wearables. IC Role / Device Role / Timing Role: Low-quiescent, enable-controlled power domain manager; synchronized with host MCU sleep/wake cycles. Use Value: Enables sub-10 µA system standby current via EN pin control and eliminates need for discrete load switches. |
| Industrial IoT Edge Node | Medical Diagnostic Handheld |
|
Use Scenario: Provides stable 2.5 V bias to precision ADCs and op-amps in battery-operated edge gateways. IC Role / Device Role / Timing Role: Precision analog supply rail generator; leverages 1% output accuracy and 65 dB PSRR to maintain measurement fidelity. Use Value: Achieves <±0.5 LSB error in 12-bit ADC conversions under varying input conditions, validated across –40°C to +85°C ambient. |
Use Scenario: Delivers regulated 2.5 V to optical sensor arrays and low-power microcontrollers in FDA-cleared handheld diagnostics. IC Role / Device Role / Timing Role: Safety-redundant power stage; thermal shutdown prevents overheating during extended clinical use. Use Value: Meets IEC 60601-1 creepage/clearance requirements via DSBGA's minimal footprint and no exposed metal leads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LPGEDR | 7-channel 200-mA sink driver with integrated LDO; 2.5 V output not available - closest fixed option is 3.3 V. | Designed for LED/display driver integration, not standalone regulation; lacks EN pin and thermal shutdown. | Select only if multi-channel sinking and LDO co-location are required; not drop-in for LP3991TLX-2.5/NOPB's single-rail role. |
| MCP1700T-2502E/TT | 250-mA SOT-23 LDO; 2.5 V output with ±2% tolerance; 170-mV dropout at 250 mA; 2 µA IQ (lower), but no inrush limiting. | Higher dropout and looser accuracy reduce margin in low-VIN or precision analog use cases; SOT-23 footprint is 3× larger than DSBGA. | Prefer when ultra-low IQ dominates design priority and board area is unconstrained; verify PSRR (55 dB @ 1 kHz) meets noise targets. |
Compared with TPL7407LPGEDR and MCP1700T-2502E/TT, LP3991TLX-2.5/NOPB uniquely balances 300-mA capability, 125-mV dropout, ±1% accuracy, and DSBGA-4 miniaturization - making it optimal for high-density, battery-sensitive digital systems where both performance and footprint are critical.
Availability
LP3991TLX-2.5/NOPB is available at Aetrix Electronics and suitable for mobile baseband power, wearable sensor hubs, industrial IoT edge nodes, medical diagnostic handhelds, and post-DC/DC regulation requiring stable component supply across automotive-grade temperature ranges and long production lifecycles.
Supply support for LP3991TLX-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 is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of LDO innovation and automotive/industrial qualification expertise.
The LP3991TLX-2.5/NOPB belongs to TI's precision low-noise LDO family, engineered specifically for post-regulation in portable digital systems where minimal footprint, low dropout, and ceramic-capacitor stability are mandatory design constraints.
FAQ
What is the minimum input voltage required for LP3991TLX-2.5/NOPB to regulate 2.5 V output?
The LP3991TLX-2.5/NOPB requires a minimum input voltage of 2.625 V to maintain regulation at 2.5 V output under full 300-mA load, based on its 125-mV dropout specification. At lighter loads, it can operate down to 1.65 V input, but regulation is only guaranteed above VIN = VOUT + VDO across the full temperature and load range.
Can LP3991TLX-2.5/NOPB be used with a 2.2 µF output capacitor?
Yes - LP3991TLX-2.5/NOPB supports 2.2 µF ceramic output capacitors (X7R/X5R) when VOUT ≥ 2.5 V, though datasheet notes minor degradation (~10–15%) in load transient response versus 4.7 µF. For optimal performance in noise-sensitive applications, TI recommends 4.7 µF as standard.
Does LP3991TLX-2.5/NOPB require an input capacitor, and what value is recommended?
Yes - LP3991TLX-2.5/NOPB requires a 1 µF ceramic input capacitor connected between IN and GND, placed within 1 cm of the IN pin. This capacitor ensures stability and mitigates high-frequency noise; larger values may be used without restriction, but ESR is not specified for the input path.
What is the thermal shutdown behavior of LP3991TLX-2.5/NOPB?
LP3991TLX-2.5/NOPB activates thermal shutdown at 160°C junction temperature and remains latched off until junction temperature falls by ~20°C (hysteresis). During shutdown, output is disabled and quiescent current drops to <1 µA, protecting the device and PCB from thermal damage.
Is LP3991TLX-2.5/NOPB compatible with 0402-case ceramic capacitors?
Yes - LP3991TLX-2.5/NOPB is explicitly characterized and guaranteed stable with 0402-size 4.7 µF X7R/X5R ceramic capacitors. TI validates this configuration across –40°C to +125°C, making it ideal for ultra-compact portable designs where board area is at a premium.
LP3991TLX-2.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 4-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 4V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.16V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 100 µA
- Current - Supply (Max):
- 225 µA
- PSRR:
- 65dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-DSBGA (1x1)
LP3991TLX-2.5/NOPB FAQ
1.How can I place an order for LP3991TLX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3991TLX-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 LP3991TLX-2.5/NOPB reliable?
The price and inventory of LP3991TLX-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 LP3991TLX-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LP3991TLX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3991TLX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3991TLX-2.5/NOPB?
LP3991TLX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3991TLX-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 LP3991TLX-2.5/NOPB?
For technical support, including LP3991TLX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3991TLX-2.5/NOPB requirements.
6.How does Aetrix verify that LP3991TLX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3991TLX-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 LP3991TLX-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LP3991TLX-2.5/NOPB?
All LP3991TLX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3991TLX-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 LP3991TLX-2.5/NOPB part is unused and in its original packaging.
Return procedure for LP3991TLX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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