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Texas Instruments LP3991TLX-1.5/NOPB
- Part No.:
- LP3991TLX-1.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 4-WFBGA, DSBGA
- Datasheet:
-
LP3991TLX-1.5/NOPB.pdf
- Description:
- IC REG LINEAR 1.5V 300MA 4DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,970
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Product details
Overview
LP3991TLX-1.5/NOPB from Texas Instruments is a fixed 1.5-V, 300-mA low-dropout linear regulator in a 4-pin DSBGA package (1.43 mm × 0.96 mm), 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 supports ceramic output capacitors as small as 2.2 µF for 1.5-V output.
For engineers reviewing the LP3991TLX-1.5/NOPB datasheet, LP3991TLX-1.5/NOPB pinout, LP3991TLX-1.5/NOPB application, or LP3991TLX-1.5/NOPB equivalent, key selection criteria include ultra-low quiescent current (50 µA at 1 mA), fast 100-µs startup to 95% of 1.5 V, 65 dB PSRR at 1 kHz, and thermal/short-circuit protection - all critical for battery-powered portable electronics and noise-sensitive digital loads.
Technical Context
The LP3991TLX-1.5/NOPB integrates a PMOS pass transistor enabling operation down to 1.65 V input while maintaining regulation at 1.5 V output. Its enable control features an internal 1.2-MΩ pulldown resistor and logic thresholds of 0.4 V (VIL) and 0.95 V (VIH), supporting direct connection to low-voltage GPIOs. The device achieves stability with minimal external components: only a 1-µF input capacitor and a 2.2–4.7-µF X7R/X5R ceramic output capacitor are required.
Designed specifically for post-buck applications, it eliminates switching ripple without sacrificing efficiency - e.g., paired with a 1.8-V buck converter, it sustains >70% overall efficiency across the Li-ion battery range. Its 280 µVRMS output noise (10 Hz–100 kHz) and 140-mV peak-to-peak load transient response (0→300 mA) support clean power delivery to RF transceivers and high-speed logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5 V ±1% at 25°C; stable over –40°C to +125°C junction range |
| Max Output Current | 300 mA continuous; supports full-load operation without external heatsink on standard PCB |
| Dropout Voltage | 125 mV at 300 mA load; enables regulation from 1.65 V input (1.5 V + 0.15 V margin) |
| Quiescent Current | 50 µA at 1 mA load; reduces standby power in always-on subsystems |
| PSRR | 65 dB at 1 kHz; suppresses residual switching noise from upstream DC-DC converters |
| Startup Time | 100 µs to 95% of 1.5 V; enables rapid power sequencing in multi-rail systems |
| Noise (10 Hz–100 kHz) | 280 µVRMS; meets low-noise requirements for ADC references and RF ICs |
Pinout & Package
LP3991TLX-1.5/NOPB uses a 4-pin DSBGA (YZR) package measuring 1.43 mm × 0.96 mm with 0.5-mm pitch. The package is optimized for minimal board area and thermal conduction via solder bumps to the PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | GND | Power ground reference; must be connected directly to PCB ground plane with low-inductance path |
| A2 | EN | Active-high enable input; internal 1.2-MΩ pulldown ensures default-off state; compatible with 1.2-V/1.8-V logic |
| B1 | OUT | Regulated 1.5-V output; requires 2.2–4.7-µF ceramic capacitor (X7R/X5R) placed ≤1 cm away |
| B2 | IN | Input supply (1.65–4 V); requires 1-µF ceramic capacitor placed ≤1 cm from pin with low-ESR path to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small footprint | DSBGA package (1.43 mm × 0.96 mm) fits into <1 mm² PCB area - ideal for wearables and compact IoT nodes |
| Inrush current limiting | Controlled to 600 mA max during startup - prevents input rail sag and avoids tripping upstream current limits |
| Ceramic capacitor compatibility | Stable with 0402-case 2.2–4.7-µF X7R/X5R ceramics - eliminates need for larger tantalum or electrolytic caps |
| Thermal & short-circuit protection | Auto-shutdown at 160°C junction temp with 20°C hysteresis; limits short-circuit current to 550–900 mA - ensures robust field reliability |
| No-load stability | Maintains regulation with zero output load - supports CMOS RAM keep-alive and always-on monitoring circuits |
Applications
| Mobile Baseband Processors | Wearable Sensor Hubs |
|---|---|
Use Scenario: Powering ARM Cortex-A/M series cores and DDR I/O in smartphones after primary buck conversion. IC Role / Device Role / Timing Role: Post-regulator providing ultra-clean 1.5-V supply to processor I/O banks, rejecting switching noise from 2-MHz buck stages. Use Value: Enables 65 dB PSRR at 1 kHz and 280 µVRMS noise - reducing bit errors in high-speed memory interfaces and improving signal integrity. | Use Scenario: Supplying MEMS accelerometers, gyroscopes, and BLE SoCs in fitness trackers with tight size constraints. IC Role / Device Role / Timing Role: Primary LDO delivering 1.5 V from coin-cell or Li-po battery; enabled only during sensor sampling bursts. Use Value: 50-µA quiescent current extends battery life; 100-µs startup allows microsecond-level power gating - cutting average system current by >40%. |
| Industrial PLC I/O Modules | Medical Patient Monitoring |
Use Scenario: Regulating 1.5-V supplies for isolated ADCs and digital isolators in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Low-noise local regulator decoupling sensitive analog front-ends from noisy 3.3-V system rails. Use Value: 125-mV dropout permits operation from aging 3.3-V rails; thermal shutdown protects against enclosure overheating in sealed enclosures. | Use Scenario: Powering ECG front-end ASICs and low-power microcontrollers in portable ECG patches. IC Role / Device Role / Timing Role: Safety-critical LDO supplying regulated 1.5 V to analog signal chain; monitored via EN pin for fault detection. Use Value: ±1% output accuracy ensures consistent ADC reference scaling; no-load stability guarantees reliable wake-up from deep sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LPGQDQ1 | 7-channel high-side driver with integrated 1.5-V LDO; higher quiescent current (100 µA) and no enable pin | Targeted for automotive LED matrix control; lacks independent enable and thermal shutdown | Select only when multi-channel drive + regulation is needed; not a drop-in replacement |
| TPS7A0515PDBVR | 1.5-V, 200-mA LDO in SOT-23; 250-mV dropout at 200 mA, 1.7-μA IQ in shutdown | Lower current rating and larger package; better for ultra-low-IQ standby but unsuitable for 300-mA loads | Choose for cost-sensitive, lower-current designs where DSBGA footprint is not mandatory |
Compared with TPL7407LPGQDQ1 and TPS7A0515PDBVR, LP3991TLX-1.5/NOPB uniquely balances 300-mA capability, 125-mV dropout, 50-µA operating IQ, and sub-1-mm² DSBGA packaging - making it optimal for high-density portable electronics requiring precise, low-noise 1.5-V regulation.
Availability
LP3991TLX-1.5/NOPB is available at Aetrix Electronics and suitable for mobile baseband processors, wearable sensor hubs, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LP3991TLX-1.5/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 expertise in precision voltage regulation and low-power design.
The LP3991TLX-1.5/NOPB belongs to TI's high-performance LDO family engineered for post-DC/DC regulation in battery-powered digital systems - prioritizing ultra-low noise, fast transient response, and minimal PCB footprint.
FAQ
What is the minimum input voltage required for LP3991TLX-1.5/NOPB to maintain regulation?
The LP3991TLX-1.5/NOPB maintains regulation down to 1.65 V input - sufficient to sustain 1.5-V output even with 150-mV dropout margin. This allows direct use after a 1.8-V buck converter with ±5% tolerance across temperature and load, eliminating need for overdesigning upstream regulation.
Can LP3991TLX-1.5/NOPB operate without an output capacitor?
No - LP3991TLX-1.5/NOPB requires a minimum 2.2-µF ceramic output capacitor (X7R/X5R dielectric) for stability. The device remains in regulation with zero load current, but omitting COUT causes oscillation and failure to regulate. Capacitor must be placed within 1 cm of the OUT pin and connected to a low-impedance ground.
Does LP3991TLX-1.5/NOPB support adjustable output voltages?
No - LP3991TLX-1.5/NOPB is a fixed-output device configured for 1.5 V only. It does not include feedback resistors or an ADJ pin. For adjustable outputs, TI offers the LP3991 family's programmable variants (e.g., LP3991-ADJ), but LP3991TLX-1.5/NOPB itself delivers strictly 1.5 V ±1% over temperature and load.
How does the EN pin function on LP3991TLX-1.5/NOPB?
The EN pin on LP3991TLX-1.5/NOPB is an active-high enable with 0.95 V threshold (VIH) and 0.4 V release (VIL). It includes an internal 1.2-MΩ pulldown resistor, ensuring default-off behavior. When pulled above 0.95 V, the device starts up in ~100 µs; below 0.4 V, output shuts down and quiescent current drops to ~2 nA - ideal for GPIO-controlled power gating.
Is LP3991TLX-1.5/NOPB suitable for automotive applications?
LP3991TLX-1.5/NOPB is not AEC-Q200 qualified and is specified for –40°C to +125°C junction temperature - suitable for extended industrial environments but not certified for automotive under-hood or safety-critical domains. For automotive-grade equivalents, consider TI's TPS7B8x-Q1 series, which offer similar performance with full AEC-Q100 qualification.
LP3991TLX-1.5/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):
- 1.5V
- 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-1.5/NOPB FAQ
1.How can I place an order for LP3991TLX-1.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3991TLX-1.5/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-1.5/NOPB reliable?
The price and inventory of LP3991TLX-1.5/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-1.5/NOPB is usually 5 days.
3.What payment methods are accepted for LP3991TLX-1.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3991TLX-1.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3991TLX-1.5/NOPB?
LP3991TLX-1.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3991TLX-1.5/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-1.5/NOPB?
For technical support, including LP3991TLX-1.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3991TLX-1.5/NOPB requirements.
6.How does Aetrix verify that LP3991TLX-1.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3991TLX-1.5/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-1.5/NOPB meets industry standards.
7.What is the process for return or replacement of LP3991TLX-1.5/NOPB?
All LP3991TLX-1.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3991TLX-1.5/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-1.5/NOPB part is unused and in its original packaging.
Return procedure for LP3991TLX-1.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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