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Texas Instruments LP38841T-0.8/NOPB
- Part No.:
- LP38841T-0.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5
- Datasheet:
-
LP38841T-0.8/NOPB.pdf
- Description:
- IC REG LINEAR 0.8V 800MA TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:353
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Product details
Overview
LP38841T-0.8/NOPB from Texas Instruments is a 0.8A ultra-low-dropout linear regulator with 0.8V fixed output, 75mV typical dropout at full load, ±1.5% initial output accuracy, and stable operation with ceramic output capacitors. It employs an N-MOS pass transistor with dual-rail architecture (VIN + VBIAS) for high efficiency in DSP, FPGA, and SMPS post-regulation applications.
For engineers reviewing the LP38841T-0.8/NOPB datasheet, LP38841T-0.8/NOPB pinout, LP38841T-0.8/NOPB application, or LP38841T-0.8/NOPB equivalent, this device delivers verified low-noise regulation (150 µVrms, 10 Hz–100 kHz), 30 nA shutdown current, and thermal/overcurrent protection - critical for core voltage supplies in embedded computing and industrial control systems.
Technical Context
The LP38841T-0.8/NOPB uses a CMOS-based N-MOS pass transistor driven by a separate 4.5–5.5V VBIAS rail, enabling operation with input voltages as low as VOUT + VDO (75 mV typ). Its loop stability relies on external ceramic capacitors (CIN ≥10 µF, COUT ≥22 µF) and achieves fast transient response without requiring high-ESR output capacitors.
This regulator integrates overtemperature and overcurrent protection, supports active shutdown via the S/D pin (logic-low turn-off), and maintains 1.5% output accuracy across −40°C to +125°C junction temperature. Ground pin current remains low across all loads, and PSRR reaches 80 dB at 120 Hz on VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 0.8V ±1.5% at 25°C; ensures precise core biasing for low-voltage logic and memory interfaces. |
| Dropout Voltage | 75 mV typical at 0.8A load; enables regulation from inputs as low as 0.875V, ideal for battery-adjacent or post-DC/DC stages. |
| Quiescent Current | 30 mA typical from VIN at full load; minimizes power loss in always-on subsystems while maintaining fast response. |
| Shutdown Current | 30 nA typical when S/D = low; reduces system standby power to nanoampere level for energy-sensitive designs. |
| Thermal Resistance θJ-A | 65°C/W (TO-220, no heatsink); defines maximum power dissipation limit before thermal shutdown under ambient conditions. |
| PSRR @ 120 Hz | 80 dB on VIN input; suppresses ripple from upstream switching regulators in SMPS post-regulator configurations. |
| Output Noise | 150 µVrms (10 Hz–100 kHz); meets low-noise requirements for analog peripherals and high-speed digital cores. |
Pinout & Package
LP38841T-0.8/NOPB is housed in a 5-pin TO-220 (KC) package with exposed tab connected to GND. The tab serves as both thermal path and electrical ground reference, requiring direct PCB copper connection for optimal thermal performance and noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: INPUT | High-current input supply | Carries full load current (up to 0.8A); must be decoupled with ≥10 µF ceramic capacitor within 1 cm. |
| 2: BIAS | Bias voltage supply | Provides gate drive for N-MOS pass transistor; requires regulated 4.5–5.5V rail and 0.1 µF bypass capacitor. |
| 3: GND | Power and analog ground | Common return for INPUT, OUTPUT, BIAS, and S/D; electrically tied to metal tab for thermal conduction. |
| 4: OUTPUT | Regulated output | Delivers stable 0.8V; requires ≥22 µF ceramic capacitor (X5R/X7R) placed ≤1 cm from pin with clean ground return. |
| 5: SHUTDOWN | Enable/disable control | Active-low logic input; pulled up to VBIAS when unused; initiates <20 µs turn-off with 30 nA quiescent current in shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 75 mV at 0.8A enables use with sub-1V input sources, extending battery life and simplifying power tree design. |
| Ceramic-capacitor stability | No ESR requirement eliminates need for tantalum or aluminum electrolytics, reducing board area and improving reliability. |
| Dual-supply architecture | Separate VBIAS rail isolates gate drive from power path, allowing VIN to operate near VOUT without compromising regulation. |
| Integrated protection | Thermal shutdown and current limiting prevent damage during overload or poor heatsinking - no external circuitry needed. |
| Low-noise output | 150 µVrms broadband noise supports noise-sensitive analog circuits and high-speed digital cores without added filtering. |
Applications
| ASIC Power Supplies | Server Core & I/O Supplies |
|---|---|
|
Use Scenario: Powering GPU voltage rails and chipset I/O in desktop/notebook platforms where space and thermal density are constrained. IC Role / Device Role / Timing Role: Primary low-noise core regulator delivering stable 0.8V to ASIC logic blocks with fast load-step response. Use Value: Enables compliance with tight voltage tolerance specs (±1.5%) and avoids brownouts during burst-mode GPU activity. |
Use Scenario: Providing tightly regulated auxiliary voltages for server motherboard management controllers and PCIe switch I/O banks. IC Role / Device Role / Timing Role: Post-regulator after intermediate bus converters, ensuring clean 0.8V supply despite upstream switching noise. Use Value: 80 dB PSRR at 120 Hz attenuates DC/DC ripple, preventing timing jitter and communication errors in high-speed serial links. |
| DSP/FPGA Core Supplies | SMPS Post-Regulator |
|
Use Scenario: Supplying core voltage to low-power DSPs and FPGA fabric in industrial edge nodes with wide ambient temperature range. IC Role / Device Role / Timing Role: Precision LDO delivering 0.8V with ±1.5% accuracy across −40°C to +125°C junction temperature. Use Value: Maintains functional integrity of digital logic under thermal stress without derating or external calibration. |
Use Scenario: Final-stage regulation after buck converters in telecom power modules where residual ripple must be eliminated. IC Role / Device Role / Timing Role: Ripple-cleaning LDO with 150 µVrms noise floor and 75 mV dropout, placed directly at point-of-load. Use Value: Eliminates need for additional LC filters, reducing BOM cost and board footprint while meeting EMI Class B limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A4700RGWR | 200mA max output, 4 µVrms noise, adjustable output; higher PSRR (≥90 dB) but lower current rating. | Suitable for ultra-low-noise analog signal chains, not high-current digital cores. | Select when noise performance dominates over current capability; not drop-in for 0.8A loads. |
| TPS74801DRCR | 1.5A output, 120 mV dropout, adjustable VOUT; requires minimum 2.2 µF ceramic output capacitor. | Supports higher current and programmable outputs but lacks fixed 0.8V option and has higher dropout. | Choose for scalable designs needing >0.8A or variable output; verify thermal margin with θJ-A = 50°C/W (SON). |
Compared with TPS7A4700RGWR and TPS74801DRCR, the LP38841T-0.8/NOPB uniquely combines fixed 0.8V output, 0.8A capability, and 75 mV dropout in a thermally robust TO-220 package - making it optimal for space-constrained, high-reliability core regulation where pin count and layout simplicity matter.
Availability
LP38841T-0.8/NOPB is available at Aetrix Electronics and suitable for ASIC power supplies, server core regulation, DSP/FPGA core voltage delivery, and SMPS post-regulation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LP38841T-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 regulation and thermal-aware packaging.
The LP38841 series was designed specifically for high-current, low-dropout point-of-load regulation in computing and communications infrastructure - emphasizing ceramic-stability, dual-rail flexibility, and integrated protection for mission-critical power domains.
FAQ
What is the minimum input voltage required for LP38841T-0.8/NOPB to maintain regulation?
The LP38841T-0.8/NOPB requires a minimum input-to-output differential of 75 mV at 0.8A load (typical dropout voltage), meaning VIN must be ≥0.875V to sustain 0.8V output. This value increases with temperature and load; full specifications are defined across −40°C to +125°C junction range per the datasheet's VDO curve.
Can LP38841T-0.8/NOPB operate without the VBIAS supply?
No - LP38841T-0.8/NOPB requires a 4.5–5.5V VBIAS supply on Pin 2 to drive the N-MOS pass transistor gate. Without VBIAS, the device cannot regulate, even if VIN is present. The VBIAS rail must be stable and bypassed with a 0.1 µF ceramic capacitor close to the pin.
What output capacitor is required for stable operation of LP38841T-0.8/NOPB?
LP38841T-0.8/NOPB requires ≥22 µF X5R or X7R ceramic output capacitance placed within 1 cm of the OUTPUT pin and returned to clean analog ground. Tantalum capacitors are not recommended; Z5U/Y5V dielectrics are prohibited due to severe capacitance loss over temperature and bias.
Does LP38841T-0.8/NOPB include thermal shutdown protection?
Yes - LP38841T-0.8/NOPB integrates thermal shutdown that activates when junction temperature exceeds +150°C (absolute max), forcing output disable until temperature falls below the hysteresis threshold. This protection is independent of external components and operates across the full −40°C to +125°C operating range.
Is LP38841T-0.8/NOPB pin-compatible with other variants in the LP38841 family?
Yes - LP38841T-0.8/NOPB shares identical 5-pin TO-220 (KC) pinout and footprint with LP38841T-1.2/NOPB and LP38841T-1.5/NOPB. Only the output voltage differs; all share identical electrical behavior, protection features, and external component requirements.
LP38841T-0.8/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-220-5
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-5
LP38841T-0.8/NOPB FAQ
1.How can I place an order for LP38841T-0.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38841T-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 LP38841T-0.8/NOPB reliable?
The price and inventory of LP38841T-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 LP38841T-0.8/NOPB is usually 5 days.
3.What payment methods are accepted for LP38841T-0.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38841T-0.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38841T-0.8/NOPB?
LP38841T-0.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38841T-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 LP38841T-0.8/NOPB?
For technical support, including LP38841T-0.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38841T-0.8/NOPB requirements.
6.How does Aetrix verify that LP38841T-0.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38841T-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 LP38841T-0.8/NOPB meets industry standards.
7.What is the process for return or replacement of LP38841T-0.8/NOPB?
All LP38841T-0.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38841T-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 LP38841T-0.8/NOPB part is unused and in its original packaging.
Return procedure for LP38841T-0.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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