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Texas Instruments LP3985ITLX-2.9/NOPB
- Part No.:
- LP3985ITLX-2.9/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LP3985ITLX-2.9/NOPB.pdf
- Description:
- IC REG LINEAR 2.9V 150MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,876
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Product details
Overview
LP3985ITLX-2.9/NOPB from Texas Instruments is a micropower, ultra-low-noise, 150mA CMOS low-dropout voltage regulator with 2.9V fixed output, 100mV max dropout at 150mA load, 30µVrms output noise (10Hz–100kHz), and 200µs typical turn-on time. It operates from 2.5V to 6.0V input and supports portable wireless applications requiring stable, low-quiescent-power biasing of RF ICs and baseband processors.
For engineers reviewing the LP3985ITLX-2.9/NOPB datasheet, LP3985ITLX-2.9/NOPB pinout, LP3985ITLX-2.9/NOPB application, or LP3985ITLX-2.9/NOPB equivalent, this page delivers verified technical context, package-specific pin mapping, real-world application constraints, and validated alternative options for battery-powered cellular handset and portable information appliance designs.
Technical Context
The LP3985ITLX-2.9/NOPB uses a CMOS pass element architecture enabling ultra-low quiescent current (≤1.5µA in shutdown) and minimal ground current increase in dropout. Its internal bandgap reference (1.23V) feeds a precision error amplifier controlling the pass device, with fast-turn-on circuitry actively pre-charging the BYPASS pin capacitor via a 70µA current source.
Stability is guaranteed with ≥0.7µF ceramic output capacitors (X7R dielectric, ESR 5–500mΩ) and requires no minimum load. The device integrates thermal shutdown (160°C trip, 20°C hysteresis) and short-circuit current limiting (600mA steady-state), and achieves 50dB PSRR at 1kHz under VIN = VOUT + 0.2V conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.9V ±3% over −40°C to +125°C junction temperature |
| Max Output Current | 150mA continuous; maintains regulation down to 100mV dropout at full load |
| Quiescent Current | ≤1.5µA in shutdown mode; 85–150µA active (typ. 100µA at 1mA load) |
| Output Noise | 30µVrms (10Hz–100kHz); reduced further with 0.01µF BYPASS capacitor |
| PSRR @ 1kHz | 50dB at VIN = VOUT + 0.2V; enables clean power delivery in noisy RF sections |
| Turn-On Time | 200µs typical (measured from VEN crossing VIH to VOUT reaching 95% of 2.9V) |
| Operating Input Range | 2.5V to 6.0V; supports single-cell Li-ion (3.0–4.2V) and dual-cell alkaline (2.4–3.2V) |
Pinout & Package
The LP3985ITLX-2.9/NOPB is packaged in a 5-bump thin DSBGA (Package Number TLA05), measuring 1.0mm × 1.0mm × 0.5mm, with non-solder-mask-defined (NSMD) pads and bottom-side solder bumps. This ultra-compact package minimizes PCB area-total application footprint can be under 2.0mm × 2.5mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Accepts 2.5–6.0V; requires ≥1µF ceramic input capacitor placed within 1cm of pin |
| GND | Power Ground Reference | Common return path for input/output/bypass; must connect to clean analog ground plane |
| VOUT | Regulated Output | Delivers stable 2.9V ±3%; requires ≥0.7µF X7R ceramic output capacitor with ESR 5–500mΩ |
| VEN | Logic-Controlled Enable | Active-high input; VIH = 1.4V min, VIL = 0.4V max; tie to VIN if always-on operation required |
| BYPASS | Noise Reduction Node | High-impedance reference node; 0.01µF ceramic (NPO/COG) or film cap reduces output noise without degrading transient response |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Shutdown | Leakage ≤1.5µA ensures negligible battery drain during system sleep in portable devices |
| Ultra-Low-Noise Regulation | 30µVrms noise enables direct powering of sensitive RF synthesizers and ADC reference supplies |
| DSBGA Space Optimization | 1.0mm × 1.0mm footprint saves >70% board area vs. SOT-23-5; ideal for slim handheld form factors |
| Fast, Controlled Startup | 200µs turn-on with internal pre-charge avoids brownout during wake-up sequences in GSM/CDMA handsets |
| No-Load Stability | Remains in regulation with zero output current-critical for CMOS RAM keep-alive and standby circuits |
Applications
| CDMA Cellular Handset RF Front-End | Portable Information Appliance Baseband Core |
|---|---|
Use Scenario: Powering low-noise amplifiers (LNAs) and mixer bias rails in CDMA transceivers operating from single Li-ion cells. IC Role / Device Role / Timing Role: Ultra-low-noise LDO delivering clean 2.9V bias to RF signal chain components. Use Value: 30µVrms noise prevents degradation of receiver sensitivity; 100mV dropout extends usable battery range down to 3.0V cell voltage. |
Use Scenario: Supplying core logic voltage to ARM-based application processors in handheld PDAs and e-readers. IC Role / Device Role / Timing Role: Micropower, enable-controlled regulator for processor I/O and memory subsystems. Use Value: ≤1.5µA shutdown current preserves battery life during extended idle periods; fast 200µs turn-on supports responsive wake-from-sleep behavior. |
| GSM Cellular Handset Audio Codec | Wideband CDMA Handset SIM Card Interface |
Use Scenario: Providing low-noise 2.9V supply to stereo audio DACs and headphone amplifiers in dual-mode GSM handsets. IC Role / Device Role / Timing Role: Low-ripple, high-PSRR regulator isolating analog audio paths from digital switching noise. Use Value: 50dB PSRR at 1kHz suppresses digital supply coupling into audio band; ceramic-capacitor stability eliminates need for bulky tantalum parts. |
Use Scenario: Generating secure 2.9V interface voltage for ISO/IEC 7816-compliant SIM card slots in WCDMA smartphones. IC Role / Device Role / Timing Role: Precision, enable-gated LDO ensuring compliant voltage timing and level during card insertion/removal. Use Value: Tight ±3% output tolerance meets SIM card spec; logic-controlled enable allows host MCU to sequence power during hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, micropower LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL720F29-DBVR | 2.9V fixed output; 250mA rating; 25µVrms noise; 1.2µA shutdown current; DSBGA-5 package | Higher output current and lower noise, but tighter input voltage min (1.7V) limits use with depleted batteries | Select when higher load margin or lower noise is critical and input stays ≥1.7V |
| MCP1700T-2902E/TT | 2.9V fixed output; 250mA rating; 30µVrms noise; 1.6µA shutdown current; SOT-23-3 package | 3-pin SOT-23 lacks enable and bypass pins; no logic control or optional noise reduction capability | Select when board space permits SOT-23 and enable/bypass features are unnecessary |
Compared with LP3985ITLX-2.9/NOPB, TPL720F29-DBVR offers lower noise and higher current in the same DSBGA-5 footprint but sacrifices low-input-voltage operation; MCP1700T-2902E/TT provides comparable noise and shutdown current in a simpler 3-pin package but omits enable control and bypass functionality essential for advanced portable power sequencing.
Availability
LP3985ITLX-2.9/NOPB is available at Aetrix Electronics and suitable for CDMA/GSM handset design, portable information appliance development, and wideband CDMA baseband power management requiring stable component supply across high-volume production cycles.
Supply support for LP3985ITLX-2.9/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 decades of expertise in power management ICs for mobile and wireless systems.
The LP3985 series was designed specifically for space-constrained, battery-powered wireless applications-delivering ultra-low noise, micropower shutdown, and fast turn-on in miniature DSBGA and USON packages for cellular handsets and portable electronics.
FAQ
What is the maximum dropout voltage specification for LP3985ITLX-2.9/NOPB at full 150mA load?
The LP3985ITLX-2.9/NOPB has a maximum dropout voltage of 100mV at 150mA load and 25°C, defined as the VIN–VOUT difference where VOUT drops 100mV below nominal 2.9V. This value is guaranteed across −40°C to +125°C junction temperature per datasheet Section 6.5, enabling operation down to 3.0V input with full load in Li-ion applications.
Does LP3985ITLX-2.9/NOPB require an external bypass capacitor to meet its 30µVrms noise specification?
No-LP3985ITLX-2.9/NOPB achieves 30µVrms output noise (10Hz–100kHz) with only the standard 1µF output capacitor. The 0.01µF BYPASS capacitor is optional and reduces noise further; it does not slow transient response and is recommended only when sub-30µVrms performance is needed for ultra-sensitive RF or audio stages.
Can LP3985ITLX-2.9/NOPB operate with zero load current while maintaining regulation?
Yes-LP3985ITLX-2.9/NOPB remains stable and in regulation with no external load, a feature explicitly confirmed in the APPLICATION HINTS section. This makes LP3985ITLX-2.9/NOPB suitable for CMOS RAM keep-alive circuits and other standby-bias applications where output current may drop to zero between active cycles.
What is the thermal shutdown threshold and hysteresis for LP3985ITLX-2.9/NOPB?
LP3985ITLX-2.9/NOPB activates thermal shutdown at 160°C junction temperature and includes 20°C hysteresis, meaning the device resumes normal operation only after junction temperature falls to approximately 140°C. This protects against sustained overtemperature conditions in compact DSBGA layouts with limited heat dissipation.
Is the DSBGA package of LP3985ITLX-2.9/NOPB sensitive to ambient light exposure?
Yes-the DSBGA package of LP3985ITLX-2.9/NOPB exhibits light sensitivity; direct sunlight or intense halogen illumination (especially red/infrared wavelengths) can cause output voltage deviation. Fluorescent lighting has negligible effect (<0.1% deviation), but PCB layout should shield the device from strong ambient light sources during operation.
LP3985ITLX-2.9/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 2.9V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.1V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 150 µA
- Current - Supply (Max):
- 250 µA
- PSRR:
- 50dB ~ 40dB (1kHz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-DSBGA (1.41x1.08)
LP3985ITLX-2.9/NOPB FAQ
1.How can I place an order for LP3985ITLX-2.9/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3985ITLX-2.9/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 LP3985ITLX-2.9/NOPB reliable?
The price and inventory of LP3985ITLX-2.9/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3985ITLX-2.9/NOPB is usually 5 days.
3.What payment methods are accepted for LP3985ITLX-2.9/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3985ITLX-2.9/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3985ITLX-2.9/NOPB?
LP3985ITLX-2.9/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3985ITLX-2.9/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 LP3985ITLX-2.9/NOPB?
For technical support, including LP3985ITLX-2.9/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3985ITLX-2.9/NOPB requirements.
6.How does Aetrix verify that LP3985ITLX-2.9/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3985ITLX-2.9/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 LP3985ITLX-2.9/NOPB meets industry standards.
7.What is the process for return or replacement of LP3985ITLX-2.9/NOPB?
All LP3985ITLX-2.9/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3985ITLX-2.9/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 LP3985ITLX-2.9/NOPB part is unused and in its original packaging.
Return procedure for LP3985ITLX-2.9/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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