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Texas Instruments LP3991TL-2.0/NOPB
- Part No.:
- LP3991TL-2.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 4-WFBGA, DSBGA
- Datasheet:
-
LP3991TL-2.0/NOPB.pdf
- Description:
- IC REG LINEAR 2V 300MA 4DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,250
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Product details
Overview
LP3991TL-2.0/NOPB from Texas Instruments is a fixed 2.0-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 delivers ±1% output accuracy at room temperature, 125-mV dropout at full load, and operates from 1.65 V to 4 V input with only 50 µA quiescent current at 1 mA load - ideal for battery-powered handheld devices requiring clean, stable core voltage.
For engineers reviewing the LP3991TL-2.0/NOPB datasheet, LP3991TL-2.0/NOPB pinout, LP3991TL-2.0/NOPB application, or LP3991TL-2.0/NOPB equivalent, key selection criteria include its ultra-low 0402-compatible ceramic capacitor support (2.2 µF min for ≤1.3 V, 4.7 µF for 2.0 V), 65 dB PSRR at 1 kHz, 100-µs startup time, thermal/short-circuit protection, and enable-controlled shutdown drawing <1 µA.
Technical Context
The LP3991TL-2.0/NOPB integrates a PMOS pass transistor with internal biasing and error amplifier, enabling operation down to 1.65 V input while maintaining regulation at 2.0 V output. Its EN pin features a 1.2-MΩ internal pulldown resistor and logic-level thresholds (VIH = 0.95 V, VIL = 0.4 V), supporting direct connection to microcontroller GPIOs without external pullups.
Stability is guaranteed with 4.7 µF X7R/X5R ceramic output capacitors (ESR 5–500 mΩ) and 1 µF input capacitance. The device remains stable under no-load conditions and exhibits controlled inrush current (600–1000 mA), minimizing input rail disturbance during power-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.0 V ±1% at 25°C; ±2.5% over –40°C to +85°C ambient - ensures reliable core supply for 2.0-V I/O or memory interfaces. |
| Max Output Current | 300 mA continuous - sufficient for powering DSP cores, FPGA I/O banks, or multi-core SoCs in portable applications. |
| Dropout Voltage | 125 mV at 300 mA load - enables regulation from 2.125 V input, critical for Li-ion battery discharge tail-end operation. |
| PSRR | 65 dB at 1 kHz - suppresses switching noise from upstream DC-DC converters, reducing need for additional filtering. |
| Quiescent Current | 50 µA at 1 mA load - extends battery life in always-on subsystems such as real-time clocks or sensor hubs. |
| Startup Time | 100 µs to 95% of 2.0 V - supports fast wake-up sequences in low-power microcontrollers and wearables. |
| Noise (10 Hz–100 kHz) | 280 µVRMS - meets low-noise requirements for ADC reference supplies and RF front-end biasing. |
Pinout & Package
LP3991TL-2.0/NOPB uses a 4-pin DSBGA (YZR) package measuring 1.43 mm × 0.96 mm with bottom-side solder bumps - optimized for ultra-compact PCB layouts in mobile and wearable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | GND | Power ground reference; must be connected directly to PCB ground plane via thermal pad for optimal thermal performance and noise immunity. |
| A2 | EN | Active-high enable input with 1.2-MΩ internal pulldown; drives regulator ON when ≥0.95 V, OFF when ≤0.4 V - enables system-level power sequencing. |
| B1 | OUT | Regulated 2.0-V output; requires 4.7 µF ceramic capacitor (X7R/X5R, ESR 5–500 mΩ) placed within 1 cm for stability and transient response. |
| B2 | IN | Input supply (1.65–4 V); requires 1 µF ceramic capacitor placed ≤1 cm from pin to suppress high-frequency noise and ensure loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input voltage operation | Starts regulation at 1.65 V - enables use after buck converters with tight output tolerances (e.g., 1.8 V ±5%) across full battery range. |
| Ceramic capacitor compatibility | Stable with 0402-size 4.7 µF X7R/X5R capacitors - eliminates need for larger case sizes, saving >0.5 mm² board area per channel. |
| Inrush current limiting | Controlled to 600–1000 mA - prevents input rail collapse during cold start, avoiding brownout resets in multi-rail systems. |
| Thermal & short-circuit protection | Auto-shutdown at 160°C junction temperature with 20°C hysteresis - ensures robustness in sealed enclosures or high-ambient environments. |
| No-load stability | Maintains regulation with zero output current - supports always-on backup rails for RTCs, SRAM retention, or wake-on-event circuits. |
Applications
| Mobile Application Processor Core Supply | Wearable Sensor Hub Power |
|---|---|
Use Scenario: Powers 2.0-V I/O domain of application processors (e.g., Qualcomm Snapdragon, MediaTek MT-series) in smartphones and tablets. IC Role / Device Role / Timing Role: Post-regulator cleaning ripple from primary buck converter; provides low-noise, fast-transient 2.0-V rail synchronized to processor sleep/wake cycles via EN pin. Use Value: Enables 65 dB PSRR suppression of 1–2 MHz switching noise, reducing EMI emissions by >10 dB and eliminating need for ferrite beads on core rails. |
Use Scenario: Supplies 2.0-V analog front-end and digital logic in compact wearable health monitors (ECG, SpO₂, motion sensors). IC Role / Device Role / Timing Role: Primary LDO delivering regulated 2.0-V from single-cell Li-ion (3.0–4.2 V); enabled only during sensor acquisition bursts to minimize average current draw. Use Value: 50 µA quiescent current and 100-µs startup allow sub-10 µA system standby with <100 µs wake latency - extending battery life to >7 days on 100 mAh cell. |
| Post-Buck Regulation for RF Modules | Low-Power MCU I/O Rail |
Use Scenario: Clean 2.0-V supply for Wi-Fi/BT transceiver I/O interfaces following a 3.3-V buck converter in IoT edge nodes. IC Role / Device Role / Timing Role: Noise-filtering LDO decoupling RF module digital control lines from switching noise; EN pin tied to host MCU GPIO for coordinated power gating. Use Value: 280 µVRMS output noise and 125-mV dropout preserve signal integrity on high-speed SDIO/UART lines, preventing packet errors under dynamic load. |
Use Scenario: Powers 2.0-V GPIO and peripheral interface of ARM Cortex-M0+/M4 microcontrollers in industrial sensor nodes. IC Role / Device Role / Timing Role: Fixed-output LDO supplying MCU I/O bank; leverages EN pin for deep-sleep mode entry/exit with <1 µA shutdown current. Use Value: ±1% output accuracy ensures reliable level-shifting between 2.0-V MCU and 3.3-V legacy peripherals, eliminating need for external voltage translators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL720F20-DBVR | 2.0-V fixed output, 200-mA max, 60-mV dropout at 150 mA, 25 µA IQ - smaller dropout but lower current rating and no EN pin. | Suitable for lower-current peripherals (I²C, SPI) but not 300-mA processor cores; lacks enable control for power sequencing. | Select TPL720F20-DBVR only when load current ≤200 mA and enable functionality is unnecessary. |
| MCP1826-2002E/DB | 2.0-V fixed output, 300-mA max, 350-mV dropout at 300 mA, 120 µA IQ - higher dropout and quiescent current than LP3991TL-2.0/NOPB. | Acceptable for cost-sensitive industrial designs where 1.65-V minimum input is not required and 280 µV noise is non-critical. | Choose MCP1826-2002E/DB only if board space allows larger SOT-23-5 package and thermal design accommodates higher power dissipation. |
Compared with TPL720F20-DBVR and MCP1826-2002E/DB, LP3991TL-2.0/NOPB uniquely balances ultra-low input voltage (1.65 V), low dropout (125 mV), low noise (280 µVRMS), and integrated enable - making it the only option suitable for high-efficiency, space-constrained, battery-operated digital systems demanding precise 2.0-V regulation.
Availability
LP3991TL-2.0/NOPB is available at Aetrix Electronics and suitable for mobile processor core supplies, wearable sensor hubs, post-buck RF regulation, and low-power MCU I/O rails requiring stable component supply across production lifecycles.
Supply support for LP3991TL-2.0/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 and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.
The LP3991 series was developed specifically for ultra-low-voltage, high-density digital applications - targeting post-regulation of DC-DC converters in battery-powered handheld devices where board space, efficiency, and noise performance are critical.
FAQ
What is the minimum input voltage required for LP3991TL-2.0/NOPB to regulate 2.0 V output?
The LP3991TL-2.0/NOPB requires a minimum input voltage of 2.125 V to maintain regulation at 2.0 V output under 300-mA load, based on its 125-mV dropout specification. However, the device can operate down to 1.65 V input - it simply cannot sustain 2.0 V output below VIN = VOUT + VDO. For reliable 2.0-V operation across temperature and load, TI recommends VIN ≥ 2.2 V.
Can LP3991TL-2.0/NOPB use a 2.2-µF output capacitor instead of 4.7 µF?
No - LP3991TL-2.0/NOPB requires a minimum 4.7-µF ceramic output capacitor (X7R/X5R, ESR 5–500 mΩ) for stable operation at 2.0 V output. The 2.2-µF option is explicitly permitted only for VOUT ≤ 1.3 V per TI's datasheet. Using 2.2 µF at 2.0 V risks instability, excessive load transient deviation (>140 mV), and potential oscillation.
Does LP3991TL-2.0/NOPB require an external pullup resistor on the EN pin?
No - LP3991TL-2.0/NOPB includes a built-in 1.2-MΩ pulldown resistor on the EN pin. To enable the device, drive EN ≥ 0.95 V (e.g., from a 1.8-V or 3.3-V GPIO). To disable, leave EN floating (it will default to GND via internal resistor) or drive ≤ 0.4 V. No external pullup is needed unless active-low logic control is implemented with an inverter.
What is the thermal performance of LP3991TL-2.0/NOPB in its DSBGA package?
LP3991TL-2.0/NOPB in the YZR (DSBGA) package has a junction-to-ambient thermal resistance (RθJA) of 189.7°C/W on a high-K PCB. At 300 mA load and 3.6 V input, power dissipation is ~480 mW, resulting in ~91°C junction rise above ambient. Derating is required above 85°C ambient; TI specifies operation up to +125°C junction temperature with proper PCB copper area and thermal vias under the die pad.
Is LP3991TL-2.0/NOPB suitable for powering analog circuits like ADC references?
Yes - LP3991TL-2.0/NOPB delivers 280 µVRMS output noise (10 Hz–100 kHz) and 65 dB PSRR at 1 kHz, making it suitable for precision analog circuits including SAR ADC references and op-amp bias rails. For ultra-low-noise applications (<100 µVRMS), TI recommends adding a 10-nF ceramic bypass capacitor between OUT and GND, which further reduces noise without degrading transient response.
LP3991TL-2.0/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):
- 2V
- 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)
LP3991TL-2.0/NOPB FAQ
1.How can I place an order for LP3991TL-2.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3991TL-2.0/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 LP3991TL-2.0/NOPB reliable?
The price and inventory of LP3991TL-2.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3991TL-2.0/NOPB is usually 5 days.
3.What payment methods are accepted for LP3991TL-2.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3991TL-2.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3991TL-2.0/NOPB?
LP3991TL-2.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3991TL-2.0/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 LP3991TL-2.0/NOPB?
For technical support, including LP3991TL-2.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3991TL-2.0/NOPB requirements.
6.How does Aetrix verify that LP3991TL-2.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3991TL-2.0/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 LP3991TL-2.0/NOPB meets industry standards.
7.What is the process for return or replacement of LP3991TL-2.0/NOPB?
All LP3991TL-2.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3991TL-2.0/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 LP3991TL-2.0/NOPB part is unused and in its original packaging.
Return procedure for LP3991TL-2.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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