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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Texas Instruments LP38841S-0.8/NOPB

Name: LP38841S-0.8/NOPB
Brand: Texas Instruments
SKU: LP38841S-0.8/NOPB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LP38841S-0.8/NOPB

Manufacturer:: Texas Instruments

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-263-6, D2PAK (5 Leads + Tab), TO-263BA

Datasheet:: LP38841S-0.8/NOPB.pdf

Description:: IC REG LINEAR 0.8V 800MA DDPAK

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Product details

Overview

LP38841S-0.8/NOPB from Texas Instruments is a 0.8A ultra-low-dropout linear regulator with fixed 0.8V output, CMOS N-MOS pass transistor architecture, 75mV typical dropout at 0.8A, ±1.5% initial output accuracy, and stable operation with ceramic output capacitors ≥22µF. It supports dual-rail operation (VIN for power path, VBIAS for gate drive) and is used in FPGA core voltage regulation where tight tolerance and fast transient response are critical.

For engineers reviewing the LP38841S-0.8/NOPB datasheet, LP38841S-0.8/NOPB pinout, LP38841S-0.8/NOPB application, or LP38841S-0.8/NOPB equivalent, this page delivers verified technical context, package-specific thermal data, confirmed ceramic capacitor stability requirements, real-world load regulation behavior (0.1%/A), and validated alternative options for low-voltage, high-current LDO designs.

Technical Context

The LP38841S-0.8/NOPB employs a CMOS-based N-channel MOSFET pass element driven by an external 4.5–5.5V VBIAS rail, enabling ultra-low dropout operation even when VIN is only ~75mV above VOUT. Its control loop is optimized for stability with ≥22µF ceramic output capacitance, not tantalum-unlike bipolar LDOs, it maintains wide bandwidth while minimizing required external components.

It integrates over-temperature and over-current protection, delivers 30nA shutdown current, and features separate ground return paths for power and analog sections. The device operates across −40°C to +125°C junction temperature and requires active pull-up on the S/D pin for reliable enable/disable control.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 0.8V ±1.5% at 25°C; ensures precise core supply for sub-1V FPGA I/O banks and ASIC logic rails.
Dropout Voltage	75mV typ at 0.8A load; enables regulation from 0.875V input, critical for post-regulation after buck converters.
Quiescent Current	30mA typ from VIN at full load; low bias consumption preserves efficiency in always-on subsystems.
Shutdown Current	30nA typ; allows deep-sleep mode in battery-backed or energy-sensitive applications without leakage penalty.
Load Regulation	0.1%/A typ; output shifts only 0.8mV per 0.1A load change-supports stable voltage under dynamic digital loads.
PSRR @ 1kHz	65dB for VIN ripple; suppresses switching noise from upstream DC/DC converters feeding the LDO input.
Thermal Resistance θ_J-A	35°C/W (DDPAK/TO-263, 1 sq.in copper); defines heatsink-free max power dissipation at given ambient temperature.

Pinout & Package

LP38841S-0.8/NOPB uses the DDPAK/TO-263 (KTT) 5-pin surface-mount package with exposed thermal pad (tab connected to GND). Pin 3 and the metal tab are both at ground potential and must be tied together via PCB copper.

Pin/Terminal	Circuit Role	Design Meaning
1: IN	High-current input supply	Connects to pre-regulated source (e.g., buck output); handles up to 0.8A; voltage must exceed VOUT + VDO.
2: BIAS	Bias rail for internal circuitry & N-FET gate drive	Requires stable 4.5–5.5V external supply; enables ultra-low-VIN operation; under-voltage lockout triggers below ~4V.
3: GND	Power and analog ground reference	Common return for IN, OUT, BIAS, and S/D; must be low-impedance; ties to exposed thermal tab.
4: OUT	Regulated output terminal	Delivers 0.8V to load; requires ≥22µF X5R/X7R ceramic capacitor placed ≤1 cm away with clean ground return.
5: S/D	Active-low shutdown control	Pull to GND to disable output; must be actively pulled up (10–100kΩ) to VBIAS if not driven by logic; turn-off delay = 20µs.

Key Features

Feature	Design Value
Stable with ceramic output capacitors	Eliminates need for higher-ESR tantalum; reduces board space and cost while improving high-frequency noise filtering.
Dual-input architecture (VIN + VBIAS)	Decouples power delivery from gate drive, enabling operation with VIN as low as VOUT + 75mV-ideal for multi-rail systems.
Ultra-low quiescent current in shutdown	30nA max ensures negligible battery drain in standby, supporting >10-year shelf life in IoT edge nodes.
Integrated protection circuits	Thermal shutdown and current limiting prevent damage during overload or poor heatsinking-no external components needed.
−40°C to +125°C operating range	Validated performance across industrial and automotive under-hood temperatures without derating.

Applications

ASIC Power Supplies in Desktops & Graphics Cards	Server Core and I/O Supplies
Use Scenario: Powering GPU memory interface voltage rails requiring tight regulation and fast transient response during burst-mode rendering. IC Role / Device Role / Timing Role: Post-regulator for buck converter outputs; provides low-noise, low-dropout 0.8V supply to GDDR6 I/O buffers. Use Value: 75mV dropout enables efficient use of intermediate bus voltages; 65dB PSRR at 1kHz attenuates switching noise from primary DC/DC stage.	Use Scenario: Delivering stable 0.8V core voltage to server CPU I/O die under rapidly varying load conditions. IC Role / Device Role / Timing Role: Low-noise LDO for SoC I/O domain; supplies regulated power to PCIe SerDes and DDR memory controllers. Use Value: 0.1%/A load regulation ensures <±0.8mV output shift across 0–0.8A load steps-critical for signal integrity in high-speed interfaces.
DSP and FPGA Power Supplies	SMPS Post-Regulator
Use Scenario: Providing clean 0.8V core supply to FPGA fabric in industrial motor control systems with wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary core regulator for Xilinx Artix-7 or Intel Cyclone V FPGA; manages dynamic current demands during configuration and logic execution. Use Value: −40°C to +125°C junction rating ensures reliability in uncooled enclosures; 35°C/W θ_J-A allows heatsink-free operation at ≤1W dissipation.	Use Scenario: Final-stage regulation after a 1.2V buck converter to meet strict ripple and accuracy specs for analog sensor front-ends. IC Role / Device Role / Timing Role: Ripple-rejection LDO; filters residual switching artifacts from upstream SMPS before analog signal chain inputs. Use Value: 150µV_rms output noise (10Hz–100kHz) and 65dB VIN PSRR preserve SNR in precision ADC references and op-amp bias networks.

ASIC Power Supplies in Desktops & Graphics Cards

Server Core and I/O Supplies

Use Scenario: Powering GPU memory interface voltage rails requiring tight regulation and fast transient response during burst-mode rendering.

IC Role / Device Role / Timing Role: Post-regulator for buck converter outputs; provides low-noise, low-dropout 0.8V supply to GDDR6 I/O buffers.

Use Value: 75mV dropout enables efficient use of intermediate bus voltages; 65dB PSRR at 1kHz attenuates switching noise from primary DC/DC stage.

Use Scenario: Delivering stable 0.8V core voltage to server CPU I/O die under rapidly varying load conditions.

IC Role / Device Role / Timing Role: Low-noise LDO for SoC I/O domain; supplies regulated power to PCIe SerDes and DDR memory controllers.

Use Value: 0.1%/A load regulation ensures <±0.8mV output shift across 0–0.8A load steps-critical for signal integrity in high-speed interfaces.

DSP and FPGA Power Supplies

SMPS Post-Regulator

Use Scenario: Providing clean 0.8V core supply to FPGA fabric in industrial motor control systems with wide ambient temperature swings.

IC Role / Device Role / Timing Role: Primary core regulator for Xilinx Artix-7 or Intel Cyclone V FPGA; manages dynamic current demands during configuration and logic execution.

Use Value: −40°C to +125°C junction rating ensures reliability in uncooled enclosures; 35°C/W θ_J-A allows heatsink-free operation at ≤1W dissipation.

Use Scenario: Final-stage regulation after a 1.2V buck converter to meet strict ripple and accuracy specs for analog sensor front-ends.

IC Role / Device Role / Timing Role: Ripple-rejection LDO; filters residual switching artifacts from upstream SMPS before analog signal chain inputs.

Use Value: 150µV_rms output noise (10Hz–100kHz) and 65dB VIN PSRR preserve SNR in precision ADC references and op-amp bias networks.

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
TPS7A8300RGRT	0.8A, 0.8V fixed, 45mV dropout (typ), 20µA IQ, but requires minimum 10µF ceramic COUT; no separate BIAS rail.	Single-supply operation simplifies layout but limits minimum VIN to ~0.845V; less suitable for ultra-low-input scenarios.	Select when board space is constrained and BIAS rail routing is impractical; verify thermal margin at full load.
LT3080IDDPBF	1.1A adjustable, 330mV dropout (typ), 1.2mA IQ, uses current-source reference; requires external SET resistor and ≥2.2µF COUT.	Adjustability enables flexible voltage scaling, but higher dropout and IQ reduce efficiency in low-VIN, low-power apps.	Choose for designs needing programmable output or tighter line regulation (±0.1%); avoid if fixed 0.8V and minimal dropout are mandatory.

Compared with TPS7A8300RGRT and LT3080IDDPBF, LP38841S-0.8/NOPB uniquely combines dual-rail ultra-low dropout (75mV), ceramic-stability guarantee (≥22µF), and industrial-temp operation in a thermally enhanced DDPAK package-making it optimal for high-reliability, low-VIN FPGA/ASIC core regulation where BIAS rail availability is acceptable.

Availability

LP38841S-0.8/NOPB is available at Aetrix Electronics and suitable for FPGA core supplies, server I/O voltage domains, and SMPS post-regulation applications requiring stable component supply, long-term lifecycle support, and RoHS-exempt compliance for legacy industrial systems.

Supply support for LP38841S-0.8/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 regulators and power delivery solutions.

The LP38841S-0.8/NOPB belongs to TI's ultra-low-dropout linear regulator product line, engineered specifically for high-current, low-voltage core and I/O rail regulation in FPGAs, ASICs, and DSPs where precision, speed, and thermal efficiency are critical.

FAQ

What is the minimum output capacitor value required for stable operation of LP38841S-0.8/NOPB?

The LP38841S-0.8/NOPB requires a minimum 22µF X5R or X7R ceramic output capacitor for guaranteed stability. Tantalum capacitors are not recommended; if used, minimum 4.7µF is required-but ceramic is preferred for lower ESR and better high-frequency noise suppression. Placement must be within 1 cm of the OUT pin with direct low-inductance ground return.

Does LP38841S-0.8/NOPB require an external bias voltage, and what is its acceptable range?

Yes, LP38841S-0.8/NOPB requires an external VBIAS supply between 4.5V and 5.5V to drive the N-MOS pass transistor gate. This separate bias rail enables ultra-low dropout operation (VIN as low as VOUT + 75mV). Operation outside this range risks under-voltage lockout or degraded regulation; the part monitors VBIAS and disables output if it falls below ~4V.

Can LP38841S-0.8/NOPB be used with a single 0.85V input supply?

No-LP38841S-0.8/NOPB cannot operate from a single 0.85V supply because it requires two independent rails: VIN (≥0.875V for 0.8A load) and VBIAS (4.5–5.5V). The 0.85V input is insufficient for VIN, and no internal charge pump generates VBIAS. A dedicated bias source is mandatory for functional operation.

What is the thermal resistance (θ_J-A) of LP38841S-0.8/NOPB in its DDPAK/TO-263 package?

The LP38841S-0.8/NOPB in DDPAK/TO-263 (KTT) package has a junction-to-ambient thermal resistance of 35°C/W when soldered to a 1 square inch copper plane on a standard 1-ounce PCB. This value assumes no additional heatsink; adding copper area beyond 1 inch yields diminishing returns, with minimum achievable θ_J-A ≈ 32°C/W.

How does the shutdown function work on LP38841S-0.8/NOPB, and what is the turn-off delay?

The S/D pin on LP38841S-0.8/NOPB is active-low: pulling it to GND disables the output. It must be actively pulled up to VBIAS (via 10–100kΩ resistor) if not driven by logic. Turn-off delay is 20µs (typical), defined under RLOAD × COUT << Td(OFF); turn-on delay is 15µs. Shutdown current drops to 30nA typical, preserving system-level power budget.

LP38841S-0.8/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):: 5.5V

Voltage - Output (Min/Fixed):: 0.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.21V @ 800mA

Current - Output:: 800mA

Current - Quiescent (Iq):: 30 µA

Current - Supply (Max):: 40 mA

PSRR:: 80dB ~ 65dB (120Hz ~ 1kHz)

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)

LP38841S-0.8/NOPB FAQ

1.How can I place an order for LP38841S-0.8/NOPB through Aetrix?

Please submit a Request for Quotation (RFQ) for LP38841S-0.8/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 LP38841S-0.8/NOPB reliable?

The price and inventory of LP38841S-0.8/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP38841S-0.8/NOPB is usually 5 days.

3.What payment methods are accepted for LP38841S-0.8/NOPB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38841S-0.8/NOPB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LP38841S-0.8/NOPB?

LP38841S-0.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LP38841S-0.8/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 LP38841S-0.8/NOPB?

For technical support, including LP38841S-0.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38841S-0.8/NOPB requirements.

6.How does Aetrix verify that LP38841S-0.8/NOPB is sourced from the original manufacturer or authorized distributors?

All LP38841S-0.8/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 LP38841S-0.8/NOPB meets industry standards.

7.What is the process for return or replacement of LP38841S-0.8/NOPB?

All LP38841S-0.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38841S-0.8/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 LP38841S-0.8/NOPB part is unused and in its original packaging.

Return procedure for LP38841S-0.8/NOPB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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