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Texas Instruments LP3986TLX285285/NOPB
- Part No.:
- LP3986TLX285285/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WFBGA, DSBGA
- Datasheet:
-
LP3986TLX285285/NOPB.pdf
- Description:
- IC REG LINEAR 2.85V 150MA 8DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,970
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Product details
Overview
LP3986TLX285285/NOPB from Texas Instruments is a dual micropower 150 mA ultra-low-dropout CMOS voltage regulator in an 8-bump DSBGA package, delivering 2.85 V and 2.85 V outputs with 60 mV dropout at full load, 40 µVrms output noise, and 200 µs fast turn-on - deployed in GSM/CDMA handset power rails for baseband and RF subsystems.
For engineers reviewing the LP3986TLX285285/NOPB datasheet, LP3986TLX285285/NOPB pinout, LP3986TLX285285/NOPB application, or LP3986TLX285285/NOPB equivalent, key selection criteria include dual independent enable control (VEN1/VEN2), stability with 1 µF ceramic output capacitors, −40°C to +125°C operating range, and 1 nA shutdown quiescent current per regulator.
Technical Context
The LP3986TLX285285/NOPB integrates two fully independent LDO regulators sharing a common VIN input but featuring separate EN1/EN2 controls and VOUT1/VOUT2 outputs. Each regulator uses a CMOS pass device with bandgap reference buffered via a dedicated BYPASS pin for noise reduction.
It employs a fast turn-on circuit that pre-charges the 0.01 µF bypass capacitor with a 70 µA internal current source, enabling 200 µs startup while maintaining 60 dB PSRR at 1 kHz and −60 dB crosstalk rejection between outputs under dynamic load switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage (VOUT1/VOUT2) | 2.85 V ±2.5% - fixed dual-output configuration optimized for GSM/CDMA baseband core and I/O rail separation. |
| Max output current per regulator | 150 mA - sufficient to power RF transceivers, audio codecs, or low-power microcontrollers without thermal derating at 70°C ambient. |
| Dropout voltage @ 150 mA | 60 mV - enables operation down to 2.925 V input for 2.85 V output, extending battery runtime in single-cell Li-ion systems. |
| Quiescent current (both ON) | 115 µA typical - minimizes standby power loss in always-on subsystems such as real-time clocks or wake-up controllers. |
| Shutdown current | 1 nA typical - allows deep-sleep modes with negligible battery drain over weeks of storage or idle periods. |
| Output noise (10 Hz–100 kHz) | 40 µVrms - low enough for noise-sensitive analog circuits like ADC references or RF synthesizer VCO supplies. |
| PSRR @ 1 kHz | 60 dB - suppresses ripple from noisy DC-DC converters feeding the LP3986TLX285285/NOPB's VIN rail. |
| Operating temperature | −40°C to +125°C - qualified for automotive infotainment and industrial handheld environments with no derating required. |
Pinout & Package
LP3986TLX285285/NOPB uses an 8-bump DSBGA package (YZR0008) with 0.5 mm pitch, 1.59 mm × 1.59 mm body size, and solder-ball terminations compatible with standard SMT reflow profiles (MSL Level-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT1 | First regulator output | Delivers regulated 2.85 V to primary subsystem (e.g., baseband processor core); requires ≥1 µF ceramic output capacitor. |
| VOUT2 | Second regulator output | Delivers regulated 2.85 V to secondary subsystem (e.g., RF front-end); electrically isolated from VOUT1 with −60 dB crosstalk rejection. |
| VIN | Common input supply | Accepts 2.7 V–6.0 V input; shared by both LDOs; requires 1 µF ceramic input capacitor placed ≤1 cm from pin. |
| EN1 | Enable for first regulator | Active-high logic input (VIH = 1.4 V min); ties to VIN for always-on operation or controlled by system PMIC for sequencing. |
| EN2 | Enable for second regulator | Independent active-high enable; supports staggered power-up/down of dual-rail loads without external logic. |
| BYPASS | Noise reduction node | Connects to 0.01 µF ceramic capacitor to reduce output noise without degrading transient response; high-impedance reference node. |
| GND | Common ground (2 pins) | Both C2 and C3 are bonded to die substrate; must be connected to low-impedance analog ground plane for optimal PSRR and noise performance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent LDOs | Enables split-rail power delivery with separate enable control-eliminates need for two discrete regulators and reduces BOM count by one IC. |
| Stable with 1 µF ceramic output caps | Reduces PCB area and cost vs. traditional LDOs requiring ≥10 µF tantalum; supports X7R/X5R dielectrics for stable capacitance across −40°C to +125°C. |
| Fast 200 µs turn-on with bypass precharge | Meets GSM burst-mode timing requirements; avoids brownout during rapid power-up sequences without sacrificing noise performance. |
| 1 nA shutdown current | Extends shelf life and standby time in battery-powered devices-critical for portable information appliances with infrequent usage patterns. |
| Over-current and thermal protection | Self-limiting foldback current limit (600 mA peak) and thermal shutdown prevent damage during short-circuit or overload events in unattended deployments. |
Applications
| GSM Cellular Handset Power | CDMA Baseband Subsystem |
|---|---|
|
Use Scenario: Powers baseband processor core and I/O domains from a single-cell Li-ion battery (2.7–4.2 V). IC Role / Device Role / Timing Role: Dual LDO delivers clean, sequenced 2.85 V rails with independent EN1/EN2 control for boot-up and sleep-state management. Use Value: 60 mV dropout extends usable battery voltage range by ~120 mV; 40 µVrms noise prevents bit errors in digital baseband signal paths. |
Use Scenario: Supplies RF transceiver and analog front-end in CDMA handsets where EMI immunity and low-noise biasing are critical. IC Role / Device Role / Timing Role: Second LDO (VOUT2) provides isolated 2.85 V rail decoupled from digital switching noise on VOUT1. Use Value: −60 dB crosstalk rejection ensures RF sensitivity remains unaffected during baseband processor load transients. |
| Portable Information Appliance | Industrial Handheld Scanner |
|
Use Scenario: Powers ARM Cortex-M based controller and display driver in barcode readers or medical PDAs. IC Role / Device Role / Timing Role: Regulator pair supplies MCU core (VOUT1) and LCD interface (VOUT2), each enabled only when active. Use Value: 1 nA shutdown current preserves battery charge during multi-week storage; DSBGA footprint saves >40% board area vs. SOIC-8 alternatives. |
Use Scenario: Delivers stable 2.85 V to laser diode driver and image sensor in ruggedized handheld scanners operating in −25°C to +70°C environments. IC Role / Device Role / Timing Role: LDO maintains regulation across wide input swing (2.7–6.0 V) and survives cold-start conditions down to −40°C junction. Use Value: −40°C to +125°C qualification eliminates derating; 220°C/W θJA enables natural convection cooling without heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC7702CPW | Fixed 2.5 V / 3.3 V dual outputs; higher 250 µA quiescent current; requires ≥10 µF output capacitance. | Not suitable for 2.85 V–2.85 V matched-rail designs; less efficient in battery-constrained applications. | Select only if fixed 2.5 V/3.3 V rails are required and board space permits larger output capacitors. |
| TPS795285DBVR | Single-channel 2.85 V LDO; 150 mA rating; 170 µA IQ; no dual-output or independent enable capability. | Requires two units plus external logic for dual-rail sequencing-increases layout complexity and component count. | Use only when dual independent enables are unnecessary and space allows duplication of single-channel solution. |
Compared with TLC7702CPW and TPS795285DBVR, LP3986TLX285285/NOPB uniquely delivers matched 2.85 V dual outputs with independent enables, sub-µA shutdown, and 1 µF ceramic stability-reducing total solution size by 35% and eliminating sequencing ICs in portable RF systems.
Availability
LP3986TLX285285/NOPB is available at Aetrix Electronics and suitable for GSM cellular handsets, CDMA baseband subsystems, and portable information appliances requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP3986TLX285285/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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for portable and industrial applications.
The LP3986TLX285285/NOPB belongs to TI's LP39xx dual-LDO family, engineered specifically for space-constrained wireless handsets and battery-powered devices demanding ultra-low noise, micropower shutdown, and minimal external components.
FAQ
What output voltages does the LP3986TLX285285/NOPB provide?
The LP3986TLX285285/NOPB provides two fixed 2.85 V outputs (VOUT1 and VOUT2) with ±2.5% tolerance over −40°C to +125°C. This dual 2.85 V configuration is factory-trimmed and not adjustable; it targets matched-rail applications such as dual-core processors or RF/baseband partitioning in cellular handsets. The LP3986TLX285285/NOPB does not support programmable or adjustable output variants.
Can the LP3986TLX285285/NOPB operate with ceramic output capacitors smaller than 1 µF?
No - the LP3986TLX285285/NOPB is specified and guaranteed stable only with ≥1 µF ceramic output capacitors (X7R/X5R dielectric recommended). Using capacitors below 1 µF risks instability, oscillation, or degraded transient response. The datasheet explicitly states 1 µF as the minimum stable value, and TI's application notes confirm that 0.47 µF or lower violates the ESR and capacitance stability envelope required for loop compensation. The LP3986TLX285285/NOPB must use ≥1 µF per output.
Does the LP3986TLX285285/NOPB require a bypass capacitor on the BYPASS pin?
Yes - a 0.01 µF ceramic capacitor is strongly recommended between BYPASS and GND to reduce output noise by up to 50% without affecting transient response. The BYPASS pin connects directly to the bandgap reference node; omitting this capacitor increases output noise to ~60 µVrms and may cause overshoot during startup. TI's datasheet Figure 6 and Application Hints section explicitly mandate this capacitor for optimal noise performance. The LP3986TLX285285/NOPB's 40 µVrms spec assumes the 0.01 µF BYPASS cap is installed.
What is the maximum input voltage the LP3986TLX285285/NOPB can accept?
The LP3986TLX285285/NOPB supports an absolute maximum input voltage of 6.5 V, but its guaranteed operating range is 2.7 V to 6.0 V per the Electrical Characteristics table. Operation above 6.0 V voids parametric guarantees and risks exceeding junction temperature limits due to increased power dissipation. For long-term reliability in production, the LP3986TLX285285/NOPB should be limited to ≤6.0 V input, especially at high ambient temperatures.
How does the LP3986TLX285285/NOPB handle thermal overload?
The LP3986TLX285285/NOPB includes integrated thermal shutdown that activates at ~150°C junction temperature, disabling both regulators until die temperature falls below ~135°C hysteresis. During overload, it also implements foldback current limiting - reducing output current to ~600 mA peak before thermal trip. These protections are fully internal and require no external components. Once tripped, the LP3986TLX285285/NOPB automatically recovers without latch-up or manual reset.
LP3986TLX285285/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 2
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 2.85V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.1V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 130 µA
- Current - Supply (Max):
- 320 µA
- PSRR:
- 60dB ~ 50dB (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:
- 8-DSBGA (1.56x1.56)
LP3986TLX285285/NOPB FAQ
1.How can I place an order for LP3986TLX285285/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3986TLX285285/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 LP3986TLX285285/NOPB reliable?
The price and inventory of LP3986TLX285285/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3986TLX285285/NOPB is usually 5 days.
3.What payment methods are accepted for LP3986TLX285285/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3986TLX285285/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3986TLX285285/NOPB?
LP3986TLX285285/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3986TLX285285/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 LP3986TLX285285/NOPB?
For technical support, including LP3986TLX285285/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3986TLX285285/NOPB requirements.
6.How does Aetrix verify that LP3986TLX285285/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3986TLX285285/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 LP3986TLX285285/NOPB meets industry standards.
7.What is the process for return or replacement of LP3986TLX285285/NOPB?
All LP3986TLX285285/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3986TLX285285/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 LP3986TLX285285/NOPB part is unused and in its original packaging.
Return procedure for LP3986TLX285285/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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