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Texas Instruments LP38511TSX-1.8/NOPB
- Part No.:
- LP38511TSX-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LP38511TSX-1.8/NOPB.pdf
- Description:
- IC REG LINEAR 1.8V 800MA DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,010
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Product details
Overview
LP38511TSX-1.8/NOPB from Texas Instruments is a 800 mA fast-transient response low-dropout linear voltage regulator with fixed 1.8 V output, ±2.5% DC accuracy over −40°C to +125°C, and integrated error flag for digital core power monitoring in ASIC/FPGA applications.
For engineers reviewing the LP38511TSX-1.8/NOPB datasheet, LP38511TSX-1.8/NOPB pinout, LP38511TSX-1.8/NOPB application, or LP38511TSX-1.8/NOPB equivalent, key selection criteria include dropout voltage (135 mV at 800 mA), stability with 10 µF ceramic output capacitor, enable threshold hysteresis (200 mV), PSRR (40 dB @ 100 kHz), and thermal shutdown at 165°C.
Technical Context
The LP38511TSX-1.8/NOPB employs a proprietary control loop architecture enabling sub-µs load transient response and maintaining regulation under rapid 10 mA ↔ 800 mA current steps. Its PMOS pass element delivers low dropout while supporting reverse-voltage protection via inherent parasitic diode conduction limited to 1 A continuous.
It integrates an open-drain ERROR flag with 74–93% VOUT falling threshold and 78–98% rising threshold, referenced to nominal 1.8 V output. The EN pin has no internal bias and requires external pull-up/pull-down; its 0.90–1.60 V ON/OFF thresholds provide noise-immune enable control with 200 mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2.5% over line, load, and −40°C to +125°C - ensures stable core supply for 1.8 V logic domains. |
| Max Output Current | 800 mA DC - supports high-current digital cores including FPGAs and DSPs without external current boosting. |
| Dropout Voltage | 135 mV at 800 mA - enables operation from 2.25 V input (e.g., 2.5 V rail) while maintaining regulation. |
| PSRR | 40 dB at 100 kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Output Capacitor | Stable with ≥10 µF X7R/X5R ceramic - eliminates need for large electrolytics, reduces board area and cost. |
| Quiescent Current | 1 µA in shutdown - minimizes standby power in always-on systems with enable-controlled sequencing. |
| Thermal Shutdown | 165°C with 10°C hysteresis - protects against sustained overload or inadequate heatsinking in compact enclosures. |
Pinout & Package
LP38511TSX-1.8/NOPB uses the DDPAK/TO-263 (KTT) 5-pin surface-mount package with exposed thermal pad (DAP) electrically connected to GND (Pin 3). The DAP must be soldered to a PCB copper pour for effective thermal management (θJA ≈ 32–60°C/W depending on copper area).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable control input | Active-high logic input with no internal bias; must be pulled to VIN or actively driven; 0.90–1.60 V thresholds ensure noise immunity. |
| 2 - IN | Input supply connection | Accepts 2.25–5.5 V input; supports reverse-voltage conditions up to 500 mV via internal PMOS parasitic diode (≤1 A continuous). |
| 3 - GND | Power ground reference | Common return for input, output, and internal circuitry; tied internally to exposed DAP for thermal conduction. |
| 4 - OUT | Regulated output terminal | Delivers 1.8 V at up to 800 mA; requires 10 µF ceramic capacitor within 1 cm for stability and transient performance. |
| 5 - ERROR | Open-drain status flag | Drives low when VOUT falls >15% below 1.8 V; requires external 10 kΩ–1 MΩ pull-up to ≤VIN; forced low during shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | Sub-µs recovery from 10 mA ↔ 800 mA load steps - maintains core voltage within specification during burst-mode processor activity. |
| Error flag with hysteresis | 74–93% falling / 78–98% rising VOUT thresholds - prevents chatter during marginal output conditions and enables reliable system fault detection. |
| Ultra-low shutdown current | 1 µA max - enables use in battery-backed or energy-harvesting systems where quiescent drain must be minimized. |
| Integrated protection | Current limiting (1.5 A peak), thermal shutdown (165°C), and over-temperature hysteresis (10°C) - eliminates need for external fault-handling circuitry. |
| Wide input range | 2.25 V to 5.5 V - compatible with common intermediate rails (2.5 V, 3.3 V, 5.0 V) and simplifies power tree design across multiple supply domains. |
Applications
| ASIC Core Power | FPGA I/O Bank Supply |
|---|---|
|
Use Scenario: Powering 1.8 V logic cores of high-performance ASICs in telecom base stations requiring tight voltage tolerance and fast load step response. IC Role / Device Role / Timing Role: Primary low-noise, low-dropout post-regulator delivering clean 1.8 V supply directly to core VDD pins. Use Value: ±2.5% output accuracy and 135 mV dropout enable reliable operation from 2.5 V input rail while minimizing heat generation. |
Use Scenario: Supplying configurable I/O banks of Xilinx or Intel FPGAs where output voltage must track process/voltage/temperature variations. IC Role / Device Role / Timing Role: Dedicated LDO per I/O bank, controlled via FPGA GPIO-driven EN pin for dynamic power gating. Use Value: Enable hysteresis (200 mV) and ERROR flag allow precise sequencing and real-time fault reporting without external supervision circuitry. |
| DDR2 Memory Termination | Industrial Control CPU Core |
|
Use Scenario: Providing VTT termination supply for DDR2 memory interfaces in storage-area network controllers. IC Role / Device Role / Timing Role: Low-noise, fast-response VTT regulator synchronized to memory controller activity. Use Value: 40 dB PSRR at 100 kHz suppresses noise coupling from switching regulators, ensuring signal integrity on high-speed data buses. |
Use Scenario: Powering ARM Cortex-A8/A9 application processors in ruggedized industrial HMIs operating from −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Main core voltage regulator with thermal shutdown and error flag interfaced to MCU watchdog logic. Use Value: Full-temperature-range ±2.5% accuracy and 165°C thermal cutoff guarantee safe operation in unventilated enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A4700RGWR | 20 V input, 1 A, ultra-low noise (4.7 µVRMS), adjustable output - lacks ERROR flag and fixed 1.8 V option. | Better suited for analog-sensitive circuits (ADCs, amplifiers); not drop-in for digital core 1.8 V rails requiring fault signaling. | Select when ultra-low noise outweighs need for integrated error monitoring and fixed 1.8 V output. |
| TPS74801DGNT | 3 A, 1.8 V fixed, integrated power-good flag, 150 mV dropout - higher quiescent current (2.5 mA vs. 1 µA shutdown). | Supports higher current loads but consumes more standby power; PG flag function differs from ERROR's voltage-threshold behavior. | Choose for systems needing >800 mA or tighter sequencing control, accepting higher shutdown current and different flag logic. |
Compared with TPS7A4700RGWR and TPS74801DGNT, the LP38511TSX-1.8/NOPB uniquely balances 800 mA capability, 1.8 V fixed output, sub-µs transient response, and dedicated ERROR flag with 1 µA shutdown - making it optimal for space-constrained digital core supplies where fault visibility and efficiency are co-prioritized.
Availability
LP38511TSX-1.8/NOPB is available at Aetrix Electronics and suitable for servers, routers/switches, and industrial embedded systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LP38511TSX-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 technologies, with decades of expertise in high-reliability linear regulators and power solutions.
The LP38511 series was designed specifically for high-performance digital core power delivery in networking, computing, and communications infrastructure - emphasizing fast transient response, precision DC accuracy, and integrated system-monitoring features.
FAQ
What is the maximum input voltage rating for LP38511TSX-1.8/NOPB?
The LP38511TSX-1.8/NOPB has an absolute maximum input voltage of +6.0 V, but its specified operating input range is 2.25 V to 5.5 V. Operation above 5.5 V risks damage or parametric failure, even briefly. For robust designs, maintain VIN ≤5.5 V under all conditions including transients and ripple.
Does LP38511TSX-1.8/NOPB require an external pull-up resistor on the ERROR pin?
Yes, the ERROR pin of LP38511TSX-1.8/NOPB is open-drain and requires an external pull-up resistor between ERROR and a supply ≤VIN. TI specifies 10 kΩ to 1 MΩ; 100 kΩ is commonly used. Pulling ERROR above VIN may cause unintended current flow through an internal parasitic diode.
Can LP38511TSX-1.8/NOPB operate with only a 10 µF output capacitor?
Yes, LP38511TSX-1.8/NOPB is explicitly characterized and guaranteed stable with a minimum 10 µF X7R or X5R ceramic capacitor at the output. Larger values improve transient response but are not required for stability. Z5U/Y5V dielectrics are not recommended due to severe capacitance loss under bias and temperature.
What happens to the ERROR flag when the EN pin is pulled low on LP38511TSX-1.8/NOPB?
When EN is pulled low, LP38511TSX-1.8/NOPB shuts down the regulator and forces the ERROR pin low immediately - regardless of actual VOUT level. This provides unambiguous indication that the device is disabled, enabling clean system-level power sequencing and fault isolation.
Is LP38511TSX-1.8/NOPB pin-compatible with other variants in the LP38511 family?
Yes, LP38511TSX-1.8/NOPB shares identical pinout and package (DDPAK/TO-263, KTT) with LP38511TS-1.8/NOPB and LP38511TJ-1.8/NOPB. All variants use the same 5-pin layout (EN, IN, GND, OUT, ERROR) and thermal pad connection, enabling direct substitution where electrical specs align.
LP38511TSX-1.8/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:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.26V @ 800mA
- Current - Output:
- 800mA
- Current - Quiescent (Iq):
- 3.5 µA
- Current - Supply (Max):
- 13 mA
- PSRR:
- 73dB ~ 70dB (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)
LP38511TSX-1.8/NOPB FAQ
1.How can I place an order for LP38511TSX-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38511TSX-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 LP38511TSX-1.8/NOPB reliable?
The price and inventory of LP38511TSX-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 LP38511TSX-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LP38511TSX-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38511TSX-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38511TSX-1.8/NOPB?
LP38511TSX-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38511TSX-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 LP38511TSX-1.8/NOPB?
For technical support, including LP38511TSX-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38511TSX-1.8/NOPB requirements.
6.How does Aetrix verify that LP38511TSX-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38511TSX-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 LP38511TSX-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LP38511TSX-1.8/NOPB?
All LP38511TSX-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38511TSX-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 LP38511TSX-1.8/NOPB part is unused and in its original packaging.
Return procedure for LP38511TSX-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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