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Texas Instruments LP3856ESX-2.5/NOPB
- Part No.:
- LP3856ESX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LP3856ESX-2.5/NOPB.pdf
- Description:
- IC REG LIN 2.5V 3A DDPAK/TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:957
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Product details
Overview
LP3856ESX-2.5/NOPB from Texas Instruments is a 2.5V, 3A ultra-low-dropout linear regulator in TO-263-5 package, featuring 390mV dropout at full load, ±1.5% output voltage accuracy, remote sense capability via SENSE pin, and 10nA shutdown quiescent current. It delivers stable power to microprocessor cores, DSPs, and GTL/SSTL bus terminators under tight input headroom conditions.
For engineers reviewing the LP3856ESX-2.5/NOPB datasheet, LP3856ESX-2.5/NOPB pinout, LP3856ESX-2.5/NOPB application, or LP3856ESX-2.5/NOPB equivalent, key selection criteria include dropout performance at 3A, ceramic capacitor stability support, remote sensing for <100mΩ trace resistance compensation, and error flag monitoring with 10% VOUT hysteresis.
Technical Context
The LP3856ESX-2.5/NOPB uses a PMOS pass element on a CMOS process enabling low ground current (4mA typical at 3A) independent of load, fast transient response (<50µs turn-on/turn-off), and operation down to 2.5V input. Its internal error amplifier compares SENSE pin voltage against a precision bandgap reference to maintain regulation at remote loads.
It integrates overtemperature and overcurrent protection with thermal foldback, supports stable operation with 10µF ceramic or tantalum output capacitors, and provides an open-drain ERROR flag asserting low when VOUT drops >10% below nominal-enabling system-level fault detection without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±1.5% at 25°C; ±3.0% over full temperature/load range |
| Max Output Current | 3A DC continuous; peak 4.5A for short durations |
| Dropout Voltage | 390mV at 3A load; enables operation with VIN as low as 2.89V |
| Ground Pin Current | 4mA typical at 3A load; enables high efficiency at full load |
| Shutdown Quiescent Current | 10nA typical; reduces system standby power to negligible levels |
| Error Flag Threshold | Asserts low when VOUT falls >10% below 2.5V; includes 5% hysteresis |
| PSRR @ 120Hz | 73dB with VIN = VOUT + 1V; suppresses ripple from upstream switching supplies |
Pinout & Package
LP3856ESX-2.5/NOPB is housed in a surface-mount TO-263-5 (D²Pak) package with exposed thermal pad for enhanced heat dissipation. The package is RoHS-compliant and rated for −40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SD | Shutdown Control Input | CMOS-compatible active-low enable; requires 10kΩ pull-up; asserts shutdown at <0.3V |
| 2 - VIN | Input Supply Terminal | Accepts 2.5V–7.0V; must be decoupled with ≥10µF ceramic/tantalum capacitor |
| 3 - GND | Power Ground Reference | Single-point Kelvin connection required for stability; carries 4mA ground current at 3A load |
| 4 - VOUT | Regulated Output Terminal | Delivers 2.5V/3A; connects directly to local load or bypassed via SENSE for remote regulation |
| 5 - SENSE | Remote Load Sense Input | Connects to load point to compensate for trace IR drop; must tie to VOUT if unused |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout architecture | 390mV at 3A enables use with 2.89V minimum input-critical for battery-powered systems |
| Ceramic capacitor compatibility | Stable with ≥10µF ceramic output caps when paired with appropriate input capacitance per Figure 29 |
| Remote sense precision | SENSE pin regulates voltage at load point, eliminating up to 300mV error from 100mΩ PCB traces |
| Integrated fault monitoring | Open-drain ERROR flag signals undervoltage events with built-in hysteresis-no external comparator needed |
| Thermal and current protection | Auto-recovering short-circuit protection plus thermal foldback prevents damage during overload or poor heatsinking |
Applications
| Microprocessor Core Supply | GTL/SSTL Bus Termination |
|---|---|
Use Scenario: Powers 2.5V I/O domains of FPGAs and ASICs with dynamic current draw up to 3A. IC Role / Device Role / Timing Role: Primary LDO delivering clean, low-noise 2.5V rail with fast transient response to logic switching. Use Value: 39mV dropout at 300mA and 390mV at 3A ensures stable operation even as battery voltage declines to 2.89V. | Use Scenario: Provides termination voltage for GTL+, SSTL_2, and BTL buses in high-speed memory interfaces. IC Role / Device Role / Timing Role: Precision 2.5V reference source with <±1.5% tolerance ensuring signal integrity across temperature. Use Value: ±3.0% worst-case tolerance over −40°C to +125°C maintains valid logic thresholds under thermal stress. |
| DSP Power Management | Post-Regulation for Switching Supplies |
Use Scenario: Supplies TI C6000 or Analog Devices SHARC DSPs requiring low-noise, tightly regulated 2.5V core voltage. IC Role / Device Role / Timing Role: Low-noise linear post-regulator reducing switching noise from upstream DC/DC converters. Use Value: 150µVrms output noise (BW = 10Hz–100kHz) preserves analog signal fidelity in mixed-signal processing. | Use Scenario: Cleans output of 3.3V buck converter feeding sensitive analog circuits needing ripple-free 2.5V. IC Role / Device Role / Timing Role: High-PSRR (73dB @ 120Hz) LDO suppressing switching ripple before critical analog stages. Use Value: 57dB PSRR at tighter VIN–VOUT margin (VIN = VOUT + 0.5V) maintains clean supply under constrained headroom. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A4700RGWR | 20V max VIN, 1A output, 4µVrms noise, no SENSE pin | Lacks remote sensing; suited for low-noise analog bias, not high-current digital loads | Select when ultra-low noise dominates over 3A current and trace compensation needs |
| LT1963AES8-2.5#TRPBF | 1.5A max output, 300mV dropout at 1.5A, no ERROR flag | No fault reporting; smaller footprint but insufficient for 3A FPGA core rails | Choose for space-constrained 1.5A applications where ERROR flag is non-critical |
Compared with TPS7A4700RGWR and LT1963AES8-2.5#TRPBF, the LP3856ESX-2.5/NOPB uniquely combines 3A output, remote sense capability, and integrated ERROR flag in a single TO-263 package-making it optimal for high-current, thermally demanding digital power delivery where load-point regulation and fault visibility are essential.
Availability
LP3856ESX-2.5/NOPB is available at Aetrix Electronics and suitable for microprocessor core supplies, GTL/SSTL bus terminators, and DSP power management requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LP3856ESX-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, embedded processing, and power management ICs, with decades of expertise in high-reliability linear regulators and power delivery solutions.
The LP3856ESX-2.5/NOPB belongs to TI's LP385x ultra-low-dropout LDO family, engineered specifically for high-current, low-voltage digital systems-including microprocessors, DSPs, and memory interface terminators-where minimal input headroom and precise remote load regulation are mandatory.
FAQ
What is the minimum input voltage required for LP3856ESX-2.5/NOPB to regulate 2.5V at 3A?
The LP3856ESX-2.5/NOPB requires a minimum input voltage of 2.89V to maintain regulation at 3A load, based on its 390mV dropout specification. This value is derived from VOUT + VDROPOUT = 2.5V + 0.39V. Below this threshold, the device enters dropout mode and output voltage will track VIN minus losses. Always verify margin using worst-case dropout data across temperature.
Can LP3856ESX-2.5/NOPB operate stably with only ceramic capacitors?
Yes, LP3856ESX-2.5/NOPB supports stable operation with ceramic output capacitors when input and output values are jointly selected per Figure 29 in the datasheet. For 3A load, a 1:1 ratio of ceramic input-to-output capacitance (e.g., 47µF IN / 47µF OUT) is recommended. Avoid Z5U/Y5V dielectrics due to severe voltage/temperature drift; X7R/X5R types are preferred.
How does the SENSE pin improve regulation in LP3856ESX-2.5/NOPB?
The SENSE pin in LP3856ESX-2.5/NOPB enables remote load regulation by closing the feedback loop at the load point rather than at the VOUT pin. When connected directly to the load, it compensates for voltage drop across PCB traces-e.g., eliminating up to 300mV error from a 100mΩ path at 3A. If unused, SENSE must be tied to VOUT.
What happens to the ERROR flag during LP3856ESX-2.5/NOPB shutdown?
During shutdown (SD pin pulled low), the ERROR flag of LP3856ESX-2.5/NOPB is forced invalid and ceases to reflect output status. This behavior conserves power and avoids false fault assertions. The ERROR pin resumes normal operation only after SD returns high and the regulator completes its 25µs turn-on delay.
Is LP3856ESX-2.5/NOPB compatible with lead-free reflow processes?
Yes, LP3856ESX-2.5/NOPB is RoHS-compliant and qualified for standard lead-free reflow profiles, including peak temperatures up to 260°C for 5 seconds. Its TO-263-5 package features matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 3 requirements when stored per MSL guidelines.
LP3856ESX-2.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 7V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.6V @ 3A
- Current - Output:
- 3A
- Current - Quiescent (Iq):
- 4 mA
- Current - Supply (Max):
- 10 mA
- PSRR:
- 73dB ~ 57dB (120Hz)
- 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:
- TO-263 (DDPAK-5)
LP3856ESX-2.5/NOPB FAQ
1.How can I place an order for LP3856ESX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3856ESX-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 LP3856ESX-2.5/NOPB reliable?
The price and inventory of LP3856ESX-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 LP3856ESX-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LP3856ESX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3856ESX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3856ESX-2.5/NOPB?
LP3856ESX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3856ESX-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 LP3856ESX-2.5/NOPB?
For technical support, including LP3856ESX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3856ESX-2.5/NOPB requirements.
6.How does Aetrix verify that LP3856ESX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3856ESX-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 LP3856ESX-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LP3856ESX-2.5/NOPB?
All LP3856ESX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3856ESX-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 LP3856ESX-2.5/NOPB part is unused and in its original packaging.
Return procedure for LP3856ESX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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