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Texas Instruments LP3991TLX-3.0/NOPB
- Part No.:
- LP3991TLX-3.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 4-WFBGA, DSBGA
- Datasheet:
-
LP3991TLX-3.0/NOPB.pdf
- Description:
- IC REG LINEAR 3V 300MA 4DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
LP3991TLX-3.0/NOPB from Texas Instruments is a fixed 3.0-V, 300-mA low-dropout (LDO) linear regulator in a 4-pin DSBGA package. It operates from 1.65 V to 4 V input, delivers ±1% output accuracy at room temperature, features 125-mV dropout at full load, and maintains stability with 4.7-µF ceramic output capacitors-ideal for post-regulation of DC-DC converters in space-constrained portable electronics.
For engineers reviewing the LP3991TLX-3.0/NOPB datasheet, LP3991TLX-3.0/NOPB pinout, LP3991TLX-3.0/NOPB application, or LP3991TLX-3.0/NOPB equivalent, key selection criteria include its ultra-low quiescent current (50 µA at 1 mA), fast 100-µs startup time, PSRR of 65 dB at 1 kHz, thermal shutdown protection, and compatibility with 0402-size ceramic capacitors.
Technical Context
The LP3991TLX-3.0/NOPB integrates a PMOS pass transistor enabling operation down to 1.65 V input while maintaining regulation at 3.0 V output. Its enable pin (EN) features an internal 1.2-MΩ pulldown resistor and logic-level thresholds (VIH = 0.95 V, VIL = 0.4 V), supporting direct microcontroller control without external biasing.
Designed for noise-sensitive digital loads, it achieves 280 µVRMS output noise (10 Hz–100 kHz) and exhibits robust transient response-80 mV peak deviation for 150 mA load steps-with no minimum load requirement and inherent short-circuit and thermal-overload protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0 V ±1% at 25°C; supports stable rail for core logic or I/O in battery-powered systems. |
| Max Output Current | 300 mA continuous; sufficient for powering SoCs, FPGAs, or multi-rail PMIC subsystems. |
| Dropout Voltage | 125 mV at 300 mA; enables regulation from 3.125 V input-critical for Li-ion (3.0–4.2 V) or single-cell alkaline operation. |
| Quiescent Current | 50 µA at 1 mA load; minimizes standby power loss in always-on or low-power sleep modes. |
| PSRR | 65 dB at 1 kHz; suppresses switching noise from upstream buck converters, improving signal integrity. |
| Startup Time | 100 µs to 95% of 3.0 V; meets fast wake-up timing requirements in responsive embedded applications. |
| Operating Temp | –40°C to +125°C junction; qualified for automotive infotainment, industrial controllers, and extended-temperature IoT nodes. |
Pinout & Package
LP3991TLX-3.0/NOPB uses a 4-pin DSBGA (YZR) package with 1.43 mm × 0.96 mm nominal body size and bottom-side solder bumps. The package is optimized for high-density PCB layouts and requires standard DSBGA mounting per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | GND | Power ground reference; must connect directly to PCB thermal pad for optimal thermal performance and noise immunity. |
| A2 | EN | Active-high enable input; internal 1.2-MΩ pulldown ensures default-off state; compatible with 1.8-V/3.3-V GPIO. |
| B1 | OUT | Regulated 3.0-V output; requires 4.7-µF X7R/X5R ceramic capacitor (≤500 mΩ ESR) placed ≤1 cm from pin. |
| B2 | IN | Input supply (1.65–4 V); requires 1-µF ceramic capacitor connected close to pin with low-inductance ground return. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 125 mV at 300 mA enables use with tight VIN–VOUT margins-e.g., 3.3-V buck feeding 3.0-V LDO rail. |
| Ceramic capacitor stability | Stable with 0402-case 4.7-µF X7R/X5R output caps-reduces board area and eliminates tantalum cost/size penalties. |
| Inrush current limiting | Controlled to 600 mA max-prevents input rail sag during power-up and avoids overstressing upstream regulators. |
| No-load regulation | Maintains 3.0-V output with zero load-essential for backup rails (e.g., RTC, SRAM keep-alive) without dummy loads. |
| Integrated protection | Thermal shutdown (160°C) and short-circuit current limit (550–900 mA) eliminate need for external fault management circuitry. |
Applications
| Mobile Phone Baseband Power | Wearable Sensor Hub Supply |
|---|---|
|
Use Scenario: Powers ARM Cortex-M4-based sensor fusion processor and MEMS accelerometers/gyros in Bluetooth LE wristband. IC Role / Device Role / Timing Role: Post-regulator cleaning ripple from 3.3-V buck converter; provides clean, low-noise 3.0-V rail for analog front-end and RF interface. Use Value: 280 µVRMS noise and 65 dB PSRR prevent ADC quantization errors and BLE packet corruption in noisy RF environments. |
Use Scenario: Supplies 3.0-V rail to ultra-low-power MCU and environmental sensors (humidity, temperature) in coin-cell–powered fitness tracker. IC Role / Device Role / Timing Role: Primary voltage regulator enabled by MCU GPIO; delivers regulated output during active sensing bursts and enters <1-µA shutdown when idle. Use Value: 50-µA quiescent current extends coin-cell life beyond 12 months; 100-µs startup enables rapid sensor wake-up without system latency. |
| Automotive Infotainment Display Bias | Industrial PLC I/O Module Rail |
|
Use Scenario: Generates 3.0-V bias for TFT-LCD source driver ICs in dashboard display unit operating across –40°C to +105°C ambient. IC Role / Device Role / Timing Role: Fixed-output LDO providing stable pixel-driving voltage; thermally coupled to display PCB copper pour for junction temp control. Use Value: –40°C to +125°C junction rating and 125-mV dropout ensure uninterrupted display operation during cold cranking (VIN dips to ~3.1 V). |
Use Scenario: Powers isolated CAN transceiver and digital I/O buffers in DIN-rail mounted programmable logic controller with 24-V DC input. IC Role / Device Role / Timing Role: Secondary regulator fed from intermediate 3.3-V buck; supplies noise-immune 3.0-V logic rail for level-shifting and isolation interfaces. Use Value: 80-mV load transient deviation prevents false CAN bit sampling during I/O switching; DSBGA footprint saves space on dense I/O carrier board. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL720F30 | Same 3.0-V output, 300-mA rating, but higher 250-mV dropout and 65-µA IQ; DSBGA-4 package identical. | Lacks inrush limiting and has lower PSRR (55 dB @ 1 kHz); less suitable for noise-sensitive post-buck roles. | Acceptable where dropout margin >250 mV exists and noise performance is secondary. |
| MCP1700T-3002E/MB | 3.0-V, 250-mA SOT-23-5 LDO; 6-µA IQ but 600-mV dropout; no enable pin or thermal shutdown. | Requires external enable circuitry and cannot support 300-mA loads; unsuitable for high-current or safety-critical designs. | Only viable for low-power, non-thermal-critical applications where board space permits SOT-23 and current <250 mA. |
Compared with TPL720F30 and MCP1700T-3002E/MB, LP3991TLX-3.0/NOPB uniquely combines ultra-low dropout (125 mV), integrated enable with pulldown, and robust protection-making it the only option among the three qualified for automotive-grade thermal cycling and high-efficiency post-regulation.
Availability
LP3991TLX-3.0/NOPB is available at Aetrix Electronics and suitable for mobile phone baseband power, wearable sensor hub supply, and automotive infotainment display bias requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP3991TLX-3.0/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 connectivity technologies, with over 90 years of innovation in power management and precision analog design.
The LP3991TLX-3.0/NOPB belongs to TI's low-noise, low-dropout LDO family engineered for portable and battery-operated systems demanding high efficiency, small footprint, and reliable operation under dynamic load and thermal conditions.
FAQ
What is the minimum input voltage required for LP3991TLX-3.0/NOPB to regulate 3.0 V?
The LP3991TLX-3.0/NOPB requires a minimum input voltage of 3.125 V to maintain regulation at 3.0 V output under full 300-mA load, based on its 125-mV dropout specification. At lighter loads, regulation is sustained down to 1.65 V input-however, for guaranteed 3.0-V output across temperature and process variation, VIN ≥ VOUT + 0.5 V (i.e., ≥3.5 V) is recommended per datasheet guidelines.
Can LP3991TLX-3.0/NOPB operate without an output capacitor?
No, LP3991TLX-3.0/NOPB requires an output capacitor for stability. For the 3.0-V version, a minimum 4.7-µF ceramic capacitor (X7R or X5R dielectric, ESR 5–500 mΩ) must be placed within 1 cm of the OUT pin and connected to a low-impedance ground. Omitting or undersizing COUT risks oscillation, excessive noise, and failure to meet transient response specs.
Does LP3991TLX-3.0/NOPB support zero-load operation?
Yes, LP3991TLX-3.0/NOPB remains stable and maintains 3.0-V regulation with zero load current-a critical feature for applications like real-time clock (RTC) backup rails or memory keep-alive circuits. This eliminates the need for external bleed resistors and reduces standby power consumption to just 50 µA quiescent current.
How does the EN pin function on LP3991TLX-3.0/NOPB?
The EN pin on LP3991TLX-3.0/NOPB is an active-high enable input with internal 1.2-MΩ pulldown. It turns the regulator on when voltage exceeds 0.95 V and disables it below 0.4 V. In shutdown mode, supply current drops to <1 µA. If enable functionality is unused, tie EN directly to VIN to ensure permanent operation-no external pullup is needed.
Is LP3991TLX-3.0/NOPB compatible with 0402-size ceramic capacitors?
Yes, LP3991TLX-3.0/NOPB is explicitly designed to be stable with 0402-case ceramic capacitors-including the required 4.7-µF output cap. TI validates this using X7R/X5R dielectrics rated for ≥6.3 V DC bias. However, designers must verify actual capacitance retention under DC bias (e.g., Figure 13 in datasheet) to ensure ≥2.2 µF minimum at 3.0 V applied.
LP3991TLX-3.0/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):
- 3V
- 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-3.0/NOPB FAQ
1.How can I place an order for LP3991TLX-3.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3991TLX-3.0/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-3.0/NOPB reliable?
The price and inventory of LP3991TLX-3.0/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-3.0/NOPB is usually 5 days.
3.What payment methods are accepted for LP3991TLX-3.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3991TLX-3.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3991TLX-3.0/NOPB?
LP3991TLX-3.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3991TLX-3.0/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-3.0/NOPB?
For technical support, including LP3991TLX-3.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3991TLX-3.0/NOPB requirements.
6.How does Aetrix verify that LP3991TLX-3.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3991TLX-3.0/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-3.0/NOPB meets industry standards.
7.What is the process for return or replacement of LP3991TLX-3.0/NOPB?
All LP3991TLX-3.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3991TLX-3.0/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-3.0/NOPB part is unused and in its original packaging.
Return procedure for LP3991TLX-3.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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