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Texas Instruments LP3856ES-1.8/NOPB
- Part No.:
- LP3856ES-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LP3856ES-1.8/NOPB.pdf
- Description:
- IC REG LIN 1.8V 3A DDPAK/TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:232
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Product details
Overview
LP3856ES-1.8/NOPB from Texas Instruments is a 3A ultra-low-dropout linear regulator with fixed 1.8V output, CMOS-based architecture, 390mV dropout at 3A, ±1.5% output voltage accuracy at 25°C, and remote sense capability for improved load regulation in distributed power systems. It delivers stable microprocessor core voltage in high-current embedded applications requiring fast transient response and ceramic capacitor compatibility.
For engineers reviewing the LP3856ES-1.8/NOPB datasheet, LP3856ES-1.8/NOPB pinout, LP3856ES-1.8/NOPB application, or LP3856ES-1.8/NOPB equivalent, key selection criteria include dropout voltage under full load, ground pin current vs. load, shutdown quiescent current (10nA), error flag threshold hysteresis, and SENSE pin implementation for remote sensing layouts.
Technical Context
The LP3856ES-1.8/NOPB uses a PMOS pass element controlled by a CMOS reference and error amplifier, enabling ultra-low dropout operation independent of load current. Its architecture supports stable operation with ceramic or tantalum output capacitors ≥10µF and includes internal overtemperature and overcurrent protection.
Unlike the LP3853 variant, the LP3856ES-1.8/NOPB substitutes the ERROR flag pin (Pin 5) with a SENSE pin for Kelvin-sense feedback-improving load regulation at remote points by compensating for PCB trace resistance. Shutdown control is active-low on Pin 1, requiring a 10kΩ pull-up resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1.5% at 25°C; ensures precise core voltage for low-voltage logic and memory interfaces. |
| Maximum Output Current | 3A DC continuous; supports high-current FPGA I/O banks, DSP cores, and ASIC subsystems. |
| Dropout Voltage | 390mV at 3A load; enables operation from 2.19V input, critical for battery-powered or post-regulated 2.5V rail systems. |
| Ground Pin Current | 4–9mA across 10mA–3A load; low and stable, minimizing system power loss and thermal impact. |
| Shutdown Quiescent Current | 10nA typical; reduces standby power in portable devices and always-on subsystems. |
| Load Regulation | 0.08% (max); maintains tight output stability across full load range, essential for noise-sensitive analog circuitry. |
| PSRR @ 120Hz | 73dB at VIN = VOUT + 1V; suppresses ripple from upstream switching regulators in hybrid power architectures. |
Pinout & Package
LP3856ES-1.8/NOPB is packaged in TO-263-5 (D²Pak), surface-mount, thermally enhanced package with exposed metal tab for heatsinking. Pin 1 is SD (active-low shutdown), Pin 2 is VIN, Pin 3 is GND, Pin 4 is VOUT, and Pin 5 is SENSE (remote voltage sense input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SD | Shutdown control input | CMOS-compatible active-low enable; requires 10kΩ pull-up to VIN for normal operation. |
| 2 - VIN | Main input supply | Accepts 2.5V–7.0V; minimum input = VOUT + dropout (2.19V for 1.8V output). |
| 3 - GND | Power ground reference | Single-point Kelvin connection required; must tie regulator, CIN, and COUT grounds together. |
| 4 - VOUT | Regulated output | Delivers 1.8V/3A; connects directly to local load or serves as return path for SENSE feedback loop. |
| 5 - SENSE | Remote output voltage sense | Connects to load point to compensate for IR drop in PCB traces; improves load regulation to ≤0.08%. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout voltage | 390mV at full 3A load enables use with tightly constrained input rails like 2.5V or single-cell Li-ion. |
| Stable with ceramic output capacitors | Supports ≥10µF X7R/X5R ceramics; eliminates ESR dependency and simplifies layout versus tantalum-only designs. |
| Remote sense capability | SENSE pin (Pin 5) enables <1% regulation error at remote loads, critical for high-current DDR memory termination or FPGA core rails. |
| Integrated protection | Thermal shutdown and current limiting prevent damage during overload or poor heatsinking conditions. |
| Low-noise operation | 150µVrms output noise (BW = 10Hz–100kHz) supports noise-sensitive analog peripherals and RF front-ends. |
Applications
| Microprocessor Core Supply | GTL/GTL+ Bus Termination |
|---|---|
Use Scenario: Powers ARM Cortex-A series or RISC-V SoC cores requiring clean, tightly regulated 1.8V at up to 3A peak current. IC Role / Device Role / Timing Role: Primary LDO delivering core voltage with fast transient response to handle CPU burst loads. Use Value: 390mV dropout allows direct regulation from 2.5V intermediate rail; SENSE pin maintains <±10mV regulation at die pad despite 50mΩ PCB trace resistance. | Use Scenario: Provides precision 1.8V termination voltage for GTL/GTL+ signaling buses in server backplanes and telecom line cards. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage reference source for parallel bus termination networks. Use Value: ±1.5% output accuracy and 0.08% load regulation ensure signal integrity margins are maintained across temperature and load variations. |
| DDR Memory Interface Power | Post-Regulator for Switching Supplies |
Use Scenario: Supplies VDDQ to DDR3/DDR4 memory modules where tight voltage tolerance and low noise are mandatory. IC Role / Device Role / Timing Role: Final-stage linear regulator filtering switching noise from upstream DC/DC converters. Use Value: 73dB PSRR at 120Hz attenuates low-frequency ripple; 150µVrms broadband noise prevents timing jitter in high-speed data eye diagrams. | Use Scenario: Clean, low-noise 1.8V rail derived from a noisy 3.3V buck converter output in industrial PLC I/O modules. IC Role / Device Role / Timing Role: High-current post-regulator suppressing switching artifacts and improving EMI compliance. Use Value: Ceramic capacitor compatibility enables compact, high-reliability design; 10nA shutdown current extends battery life in backup modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP3853ES-1.8/NOPB | Same package and output, but features ERROR flag (Pin 5) instead of SENSE; no remote sensing capability. | Suitable for local-load applications where output monitoring is prioritized over remote regulation. | Select LP3853ES-1.8/NOPB when fault reporting is required and load is adjacent to regulator; LP3856ES-1.8/NOPB when trace resistance exceeds 20mΩ. |
| TPS7A8300RGRT | 3A, 1.8V LDO with 115mV dropout at 3A, 2.5µVrms noise, and integrated soft-start; uses 20-pin QFN package. | Higher integration (enable, power-good, thermal foldback) but requires PCB redesign due to different footprint and pinout. | Choose TPS7A8300RGRT for new designs needing lower noise, lower dropout, and digital control; retain LP3856ES-1.8/NOPB for legacy TO-263 layouts and proven ceramic-stability behavior. |
Compared with LP3853ES-1.8/NOPB, LP3856ES-1.8/NOPB trades error-flag diagnostics for remote sensing-enabling tighter regulation at distant loads without adding external op-amps. Versus TPS7A8300RGRT, it offers drop-in TO-263 compatibility and simpler biasing but higher dropout and noise; ideal for cost-sensitive, thermally robust industrial upgrades.
Availability
LP3856ES-1.8/NOPB is available at Aetrix Electronics and suitable for microprocessor core supplies, DDR memory interfaces, GTL bus terminators, and post-regulator applications requiring stable component supply, long-term manufacturability, and automotive-grade thermal resilience (−40°C to +125°C junction).
Supply support for LP3856ES-1.8/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 regulation and low-noise power solutions.
The LP3856ES-1.8/NOPB belongs to TI's ultra-low-dropout linear regulator family designed for high-current, low-voltage digital systems-including microprocessors, FPGAs, and memory interfaces-where precision, speed, and thermal efficiency are critical.
FAQ
What is the minimum input voltage required for LP3856ES-1.8/NOPB to maintain regulation?
The minimum input voltage for LP3856ES-1.8/NOPB is the sum of its nominal output voltage (1.8V) and dropout voltage. At 3A load, dropout is 390mV, so minimum VIN = 2.19V. The device also specifies an absolute minimum operating VIN of 2.5V per datasheet-thus 2.5V is the practical lower limit regardless of load. LP3856ES-1.8/NOPB will not regulate below this threshold.
Can LP3856ES-1.8/NOPB be used with only ceramic capacitors?
Yes, LP3856ES-1.8/NOPB is explicitly characterized for stable operation with ceramic output capacitors ≥10µF, provided sufficient ceramic input capacitance is used-e.g., 10µF input allows up to ~50µF ceramic output at 3A load (per Figure 29). X7R or X5R dielectrics are recommended to maintain capacitance across voltage and temperature. LP3856ES-1.8/NOPB does not require ESR tuning, unlike older LDOs.
How does the SENSE pin on LP3856ES-1.8/NOPB improve regulation accuracy?
The SENSE pin on LP3856ES-1.8/NOPB enables Kelvin sensing: it connects directly to the load point, allowing the regulator to measure and regulate voltage *at the load*, not at the VOUT pin. This compensates for IR drop across PCB traces-e.g., with 3A through 30mΩ trace resistance, SENSE eliminates a 90mV error. LP3856ES-1.8/NOPB achieves ≤0.08% load regulation using this method.
What is the purpose of the 10kΩ pull-up resistor on the SD pin of LP3856ES-1.8/NOPB?
The 10kΩ pull-up resistor on the SD pin of LP3856ES-1.8/NOPB ensures the regulator remains enabled during power-up and normal operation by holding SD at VIN (logic high). Without it, the CMOS input floats, risking erratic enable/disable behavior. The resistor value balances leakage immunity (≥10kΩ) and rise-time (≤1MΩ); LP3856ES-1.8/NOPB draws only 1nA into SD, minimizing power loss.
Does LP3856ES-1.8/NOPB include overtemperature protection?
Yes, LP3856ES-1.8/NOPB integrates thermal shutdown protection that disables the output when junction temperature exceeds +125°C (typical). Recovery occurs once temperature falls below the hysteresis threshold (~15°C below trip point). This protection operates independently of load current and shutdown state, safeguarding the device during sustained overload or inadequate heatsinking. LP3856ES-1.8/NOPB is rated for −40°C to +125°C junction operation.
LP3856ES-1.8/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 7V
- Voltage - Output (Min/Fixed):
- 1.8V
- 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)
LP3856ES-1.8/NOPB FAQ
1.How can I place an order for LP3856ES-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3856ES-1.8/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 LP3856ES-1.8/NOPB reliable?
The price and inventory of LP3856ES-1.8/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3856ES-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LP3856ES-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3856ES-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3856ES-1.8/NOPB?
LP3856ES-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3856ES-1.8/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 LP3856ES-1.8/NOPB?
For technical support, including LP3856ES-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3856ES-1.8/NOPB requirements.
6.How does Aetrix verify that LP3856ES-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3856ES-1.8/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 LP3856ES-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LP3856ES-1.8/NOPB?
All LP3856ES-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3856ES-1.8/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 LP3856ES-1.8/NOPB part is unused and in its original packaging.
Return procedure for LP3856ES-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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