Texas Instruments LP3986TL-2828/NOPB

Introduction to the LP3986TL-2828/NOPB Dual LDO Voltage Regulator from Texas Instruments

The LP3986TL-2828/NOPB from Texas Instruments is a dual-channel, ultra low-dropout (LDO) linear regulator optimized for high-performance, space-constrained portable electronics. Packaged in a compact 8-bump DSBGA (1.56 × 1.56 mm), it delivers fixed positive 2.8V output across two independent 150 mA channels. The dual-channel design delivers flexibility and integration for systems requiring multiple low-noise supply rails without increasing PCB footprint, making this part especially attractive for battery powered and handheld devices.

LP3986TL-2828/NOPB Application Scenarios and Usage Examples

The small size, low dropout voltage, and low quiescent current of the LP3986TL-2828/NOPB make it ideal for the most demanding portable and wireless applications. Typical application scenarios include:

CDMA and GSM cellular handsets: providing separate clean rails for RF and baseband processing.

Portable information appliances: enabling stable voltage for multiple subsystems in PDAs, handheld terminals, or smart wearables.

Battery-operated equipment: maximizing runtime by minimizing quiescent current and handling input voltages close to output voltage.

Low standby-power modules: with the dual enable pins allowing selective shutdown for power savings.

Designers will especially benefit in systems with keep-alive RAM or sensor circuits where zero-load stability is a must, as the LP3986 remains stable at no load.

Main Characteristics and Advantages of LP3986TL-2828/NOPB

The LP3986TL-2828/NOPB’s feature set is tailored to address both performance and board space challenges in modern electronics design:

Dual independent regulators: Provide two isolated, low-noise power rails in a single package.

Miniature 8-pin DSBGA package: Suits ultra-compact layouts typical of mobile devices.

Low dropout voltage: Maintains regulation with an input only ~200-300 mV above output, enabling extended battery operation.

Fast turn-on with speed-up bypass circuit: Suitable for systems needing quick power-up.

Logic-controlled enable for each channel: Allows for dynamic power management with simple MCU/logic interface.

Ultra low output noise and high PSRR: Output noise can be further reduced by connecting a bypass capacitor, helpful for RF and audio-sensitive designs. PSRR remains above 60 dB at low frequencies.

Stable with low-value ceramic (1 µF) and wide ESR capacitor choices: Facilitates BOM cost minimization and PCB area efficiency.

Over-current and thermal protection: Enhances long-term device reliability and application robustness.

Electrical Specifications and Thermal Behavior of LP3986TL-2828/NOPB

The regulator architecture of the LP3986TL-2828/NOPB ensures robust performance in real-world battery-powered environments:

Output current: Up to 150 mA per channel with guaranteed regulation across the full -40°C to +125°C temperature range.

Input voltage range: Functionality with inputs as low as VOUT(nominal) + 0.5V, with regulation typically maintained to a dropout of 100 mV at low load.

Exceptionally low quiescent current, largely independent of output current, translates to better battery life.

Power supply rejection ratio (PSRR): Maintains high rejection of 60 dB at low frequencies and 55 dB at 10 kHz, minimizing noise propagation from the upstream supply.

Supports a wide range of ceramic, tantalum, and film capacitors at the input and output, with output stable with ESR values from 5 mΩ up to 500 mΩ.

Maximum power dissipation is a function of thermal environment, with 250 mW supported up to 70°C ambient. Proper derating is necessary at higher temperatures.

LP3986TL-2828/NOPB Design Recommendations and Integration Tips

Successful design-in of the LP3986TL-2828/NOPB involves specific guidance on board layout and passive selection:

Input Capacitor: Place a low-ESR ceramic (≥1 µF) as close as possible to the VIN pin for stability; if using tantalum, ensure the part can withstand surge currents.

Output Capacitor: Select X7Ror X5R-type ceramics for best performance over temperature. Required values are 1–22 µF, with emphasis on ESR compliance to maintain loop stability.

Bypass Capacitor: For minimum noise, place a 0.01 µF ceramic or film capacitor at the bypass pin; this also speeds up start-up and suppresses overshoot without affecting transient response.

Enable Inputs: To guarantee intended on/off operation, logic signals must cleanly cross VIH/VIL thresholds; unused enable pins should be tied to VIN.

PCB Assembly: DSBGA packages require tight pitch and controlled reflow for reliable mounting; consult manufacturer guidelines for best results.

Light Sensitivity: For designs exposed to direct sunlight or strong IR, shield the package or avoid exposure, as certain wavelengths can affect internal operation.

Zero-Load Stability: The regulator remains in regulation even with no external load, ideal for always-on/backup power applications.

Package Specifications and Installation Guidelines for LP3986TL-2828/NOPB

The LP3986TL-2828/NOPB comes in a lead-free, RoHS-compliant 8-ball DSBGA (YZR0008), with a body size of approximately 1.56 × 1.56 mm and a height less than 0.65 mm. DSBGA mounting requires special considerations for alignment and reflow conditions; the package is rated MSL 1 (unlimited floor life at ≤30°C/85% RH). Engineers must ensure ESD safety during assembly, as the device has limited built-in protection.

LP3986TL-2828/NOPB Environmental Standards and Compliance Data

The LP3986TL-2828/NOPB is RoHS3 compliant and REACH unaffected, qualifying for lead-free assembly and use in environmentally conscious products.

The part carries an MSL (Moisture Sensitivity Level) of 1.

ECCN is EAR99, with no export controls beyond those generally applying to electronic components.

Alternative and Substitute Devices Comparable to LP3986TL-2828/NOPB

When considering alternative solutions or designing for long-term supply assurance, engineers may evaluate:

Texas Instruments LP3985: A single-output version in the same CMOS LDO family, with similar low noise and dropout characteristics. Use for designs needing only one regulated output or requiring further miniaturization.

Comparable dual-channel low dropout LDOs from other major analog IC vendors, where required output voltage, current, and package constraints align.

For design refreshes or if lifecycle status changes, review the product’s active/lifebuy/NRND/obsolete status in ongoing design qualification.

Any replacement must support similar output-voltage accuracy, noise, dropout, and stability with low-ESR ceramic caps in a compact package for best results.

Conclusion

The LP3986TL-2828/NOPB dual LDO regulator from Texas Instruments delivers a compelling mix of ultra-compact integration, low noise, robust protection, and battery-optimized performance for portable electronics. Its dual-output architecture, miniature DSBGA package, and ease of use with standard ceramic capacitors help engineers meet stringent space, efficiency, and EMI requirements. With guaranteed operation across a wide temperature range and strong environmental compliance, the LP3986TL-2828/NOPB stands out as a strategic choice for miniaturized, high-reliability design—while also offering migration paths within the same IC family or across the market for versatile sourcing strategies.