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Texas Instruments LP3990TLX-2.5/NOPB
- Part No.:
- LP3990TLX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 4-WFBGA, DSBGA
- Datasheet:
-
LP3990TLX-2.5/NOPB.pdf
- Description:
- IC REG LINEAR 2.5V 150MA 4DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,880
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Product details
Overview
LP3990TLX-2.5/NOPB from Texas Instruments is a 150-mA, 2.5-V fixed-output linear voltage regulator in a 6-pin WSON package, designed for portable digital systems. It delivers ±1.5% output voltage accuracy over temperature, supports 2 V to 6 V input, achieves 120 mV typical dropout at full load, and operates with only 1 µF ceramic input/output capacitors - enabling compact, low-noise power for baseband processors and RF ICs.
For engineers reviewing the LP3990TLX-2.5/NOPB datasheet, LP3990TLX-2.5/NOPB pinout, LP3990TLX-2.5/NOPB application, or LP3990TLX-2.5/NOPB equivalent, key selection criteria include ultra-low quiescent current (43 µA enabled / <10 nA disabled), fast 105 µs startup, 150 µVRMS output noise, and logic-controlled enable with internal 1-MΩ pull-down - critical for battery life and dynamic power sequencing in handheld electronics.
Technical Context
The LP3990TLX-2.5/NOPB implements a PMOS pass transistor architecture with internal voltage reference and error amplifier, enabling stable regulation without external compensation. Its enable circuitry features a defined VIH threshold of 0.95 V and VIL of 0.4 V, with an integrated 1-MΩ pull-down resistor ensuring default-off behavior when EN is floating.
Thermal protection activates at ~155°C junction temperature with ~15°C hysteresis, and the device maintains regulation across –40°C to 125°C ambient. It achieves 55 dB PSRR at 1 kHz and remains stable with 1 µF ceramic output capacitors having ESR between 5 mΩ and 500 mΩ - eliminating need for bulk capacitance or noise-bypass components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±1.5% over full line/load/temperature range - ensures reliable core voltage for 2.5-V logic and analog subsystems. |
| Max Output Current | 150 mA continuous - sufficient for powering DSPs, microcontrollers, and RF front-end bias rails in portable devices. |
| Dropout Voltage | 120 mV typical at 150 mA - enables operation down to 2.62 V input, extending battery runtime in single-cell Li-ion/Li-poly systems. |
| Quiescent Current | 43 µA enabled / <10 nA disabled - minimizes standby power loss and supports long-duration sleep modes. |
| PSRR | 55 dB at 1 kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Output Noise | 150 µVRMS (10 Hz–100 kHz) - meets low-noise requirements for ADC references and RF synthesizer supplies. |
| Startup Time | 105 µs to 95% VOUT - enables rapid power-up of digital subsystems during wake-from-sleep transitions. |
Pinout & Package
LP3990TLX-2.5/NOPB uses the WSON-6 (NGG) package: 2.90 mm × 1.60 mm body with exposed thermal pad (connected to Pin 2/GND). The pinout is validated per TI SNVS251J Rev J datasheet Figure 3 (WSON top view).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input supply connection | Accepts 2 V–6 V input; requires 1 µF ceramic capacitor placed ≤1 cm from pin to GND for stability. |
| 2 GND | Power ground reference | Common return path for input/output currents; thermal pad must be soldered to PCB ground plane for thermal performance. |
| 3 EN | Logic-enable control input | Active-high enable with 0.95 V VIH; internal 1-MΩ pull-down ensures safe default-off state if left unconnected. |
| 4 NC | No internal connection | Not bonded; must remain unconnected - no routing or copper fill allowed. |
| 5 OUT | Regulated output terminal | Delivers 2.5 V to load; requires 1 µF ceramic capacitor with 5–500 mΩ ESR directly at pin for stability. |
| 6 NC | No internal connection | Not bonded; must remain unconnected - no routing or copper fill allowed. |
Key Features
| Feature | Design Value |
|---|---|
| Ceramic-capacitor stability | Guaranteed stable with ≥1 µF X7R/X5R ceramic COUT - eliminates need for larger tantalum or electrolytic capacitors, saving board space and cost. |
| Ultra-low shutdown IQ | <10 nA typical - reduces battery drain to negligible levels during system deep-sleep, extending shelf life and standby time. |
| No noise-bypass capacitor required | 150 µVRMS output noise achieved without external bypass cap - simplifies BOM and layout while maintaining clean analog supply. |
| Thermal overload protection | Auto-shutdown at ~155°C with 15°C hysteresis - prevents permanent damage during transient overloads or poor heatsinking. |
| Fast transient response | ≤100 mV output deviation for 1–150 mA load steps with 1 µF COUT - maintains voltage integrity during processor burst-mode operation. |
Applications
| Mobile Baseband Power | RF Front-End Bias |
|---|---|
Use Scenario: Powering ARM-based application processors and modem baseband ICs in smartphones and tablets. IC Role / Device Role / Timing Role: Primary 2.5-V core supply regulator delivering clean, sequenced power during boot and dynamic DVFS transitions. Use Value: 43 µA quiescent current extends battery life in idle states; 105 µs startup enables rapid wake-up from suspend-to-RAM without voltage droop. |
Use Scenario: Supplying bias voltage to RF power amplifiers, LNAs, and mixer stages in cellular transceivers. IC Role / Device Role / Timing Role: Low-noise local LDO providing isolated 2.5-V rail decoupled from noisy switched-mode power supplies. Use Value: 150 µVRMS noise and 55 dB PSRR minimize phase noise degradation in RF synthesizers and improve receiver sensitivity. |
| Portable Audio Codec Supply | Low-Power Sensor Hub |
Use Scenario: Generating reference voltage for high-resolution audio DACs and ADCs in Bluetooth headsets and wearables. IC Role / Device Role / Timing Role: Precision analog supply regulator ensuring stable reference for 24-bit audio conversion. Use Value: ±1.5% output tolerance and <10 nA shutdown current preserve audio fidelity and extend battery runtime between charges. |
Use Scenario: Powering MEMS accelerometers, gyroscopes, and environmental sensors in IoT edge nodes. IC Role / Device Role / Timing Role: Always-on LDO supplying regulated 2.5-V rail to sensor interface and ultra-low-power MCU during motion-triggered wake events. Use Value: Stable regulation with 1 µF ceramic caps enables miniaturized PCB designs; thermal shutdown protects against enclosure overheating in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL720F25DBVR | 200-mA output, 25 µA IQ enabled, same 2.5-V fixed output and WSON-5 package - but lacks thermal shutdown and has higher 200 mV dropout. | Suitable for space-constrained apps where thermal margin is assured and higher dropout is acceptable. | Select TPL720F25DBVR only if lower IQ is prioritized and thermal derating is managed externally. |
| MCP1700T-2502E/MB | 250-mA output, 1.6 µA IQ enabled, SOT-23-3 package - no enable pin, fixed 2.5 V, but requires ≥2.7 V input and offers no thermal protection. | Better for always-on, non-sequenced rails where minimal IQ dominates design priority and input voltage exceeds 2.7 V. | Choose MCP1700T-2502E/MB only for simple, always-on 2.5-V supplies with VIN ≥2.7 V and no enable/control requirement. |
Compared with LP3990TLX-2.5/NOPB, TPL720F25DBVR trades thermal safety and lower dropout for slightly lower IQ, while MCP1700T-2502E/MB sacrifices enable control and thermal protection to achieve ultra-low 1.6 µA IQ - making LP3990TLX-2.5/NOPB the balanced choice for sequenced, thermally robust, low-noise 2.5-V regulation in portable digital systems.
Availability
LP3990TLX-2.5/NOPB is available at Aetrix Electronics and suitable for mobile baseband power, RF front-end bias, portable audio codec supply, and low-power sensor hub applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for LP3990TLX-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 and embedded processing technologies, with decades of expertise in power management ICs for portable and industrial applications.
The LP3990TLX-2.5/NOPB belongs to TI's LP3990 family of ultra-low-noise, ceramic-stable LDOs - engineered specifically for battery-powered digital systems demanding precision voltage, minimal footprint, and dynamic power control.
FAQ
What is the minimum input voltage required for LP3990TLX-2.5/NOPB to regulate 2.5 V output?
The LP3990TLX-2.5/NOPB requires a minimum input voltage of 2.62 V under full 150-mA load (2.5 V + 120 mV typical dropout), or 2 V minimum if load current is light. Per datasheet Section 6.3, VIN must be ≥(VOUT + VDO) or 2 V - whichever is greater - to maintain regulation. Below this, output voltage drops proportionally with input.
Can LP3990TLX-2.5/NOPB operate without an enable signal connected?
Yes - LP3990TLX-2.5/NOPB includes an internal 1-MΩ pull-down resistor on the EN pin, so it defaults to disabled (output off, IQ <10 nA) when EN is left floating or unconnected. To enable operation, EN must be driven ≥0.95 V; tying EN to VIN is a common method for permanent enable.
Is a noise-bypass capacitor required for LP3990TLX-2.5/NOPB to meet its 150 µVRMS noise specification?
No - the LP3990TLX-2.5/NOPB achieves 150 µVRMS output noise (10 Hz–100 kHz) without any external noise-bypass capacitor. This is explicitly stated in the Features list and verified in Electrical Characteristics Table 6.5, making it suitable for noise-sensitive analog circuits without added components.
What ceramic capacitor types are recommended for LP3990TLX-2.5/NOPB output?
X7R and X5R dielectrics are recommended for the LP3990TLX-2.5/NOPB output capacitor due to their stable capacitance over temperature (±15% for X7R from –55°C to 125°C). Z5U and Y5V types may lose >50% capacitance above 25°C and are discouraged unless ambient temperature is tightly controlled.
Does LP3990TLX-2.5/NOPB provide short-circuit protection?
Yes - LP3990TLX-2.5/NOPB includes internal short-circuit current limiting with a typical limit of 550–1000 mA (Section 6.5), combined with thermal shutdown that disables output at ~155°C junction temperature. These protections prevent damage during sustained output shorts or excessive power dissipation.
LP3990TLX-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):
- 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:
- 4-DSBGA (1x1)
LP3990TLX-2.5/NOPB FAQ
1.How can I place an order for LP3990TLX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3990TLX-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 LP3990TLX-2.5/NOPB reliable?
The price and inventory of LP3990TLX-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 LP3990TLX-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LP3990TLX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3990TLX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3990TLX-2.5/NOPB?
LP3990TLX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3990TLX-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 LP3990TLX-2.5/NOPB?
For technical support, including LP3990TLX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3990TLX-2.5/NOPB requirements.
6.How does Aetrix verify that LP3990TLX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3990TLX-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 LP3990TLX-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LP3990TLX-2.5/NOPB?
All LP3990TLX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3990TLX-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 LP3990TLX-2.5/NOPB part is unused and in its original packaging.
Return procedure for LP3990TLX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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