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Texas Instruments LP38511TS-1.8/NOPB
- Part No.:
- LP38511TS-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LP38511TS-1.8/NOPB.pdf
- Description:
- IC REG LINEAR 1.8V 800MA DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:405
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Product details
Overview
LP38511TS-1.8/NOPB from Texas Instruments is a fixed-output 1.8 V, 800 mA low-dropout linear voltage regulator with fast transient response and integrated error flag output. It operates from 2.25 V to 5.5 V input, delivers ±2.5% output accuracy over −40°C to +125°C, and remains stable with only 10 µF ceramic output capacitance - designed for powering digital core rails in FPGAs, ASICs, and DSPs.
For engineers reviewing the LP38511TS-1.8/NOPB datasheet, LP38511TS-1.8/NOPB pinout, LP38511TS-1.8/NOPB application, or LP38511TS-1.8/NOPB equivalent, key selection considerations include dropout voltage (135 mV @ 800 mA), PSRR (40 dB @ 100 kHz), enable threshold hysteresis (200 mV), thermal shutdown behavior (165°C), and DDPAK/TO-263 package thermal resistance (θJA = 60°C/W).
Technical Context
The LP38511TS-1.8/NOPB uses a proprietary control loop architecture optimized for rapid line and load transient response - critical for high-performance digital cores requiring tight voltage regulation during dynamic current steps (e.g., 10 mA ↔ 800 mA). Its PMOS pass element enables low dropout and reverse-voltage protection via inherent parasitic diode conduction above 500 mV differential.
It integrates an open-drain ERROR flag with 74–93% falling/rising thresholds relative to nominal VOUT, hysteresis-enabled detection of >15% output sag, and active-low assertion during EN deactivation. The device features internal over-current and thermal shutdown protection, with cycle-by-cycle current limiting preceding thermal servoing.
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 reliable core logic supply under worst-case conditions. |
| Max Output Current | 800 mA DC - supports mid-range FPGA I/O banks or dual-core DSP subsystems without external current boosting. |
| Dropout Voltage | 135 mV typical at 800 mA - enables operation from 2.5 V rail with ≥700 mV headroom, minimizing power loss and heat generation. |
| PSRR | 40 dB at 100 kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Ground Current | 13 mA typical at 800 mA load - directly impacts system quiescent power budget and thermal design margin. |
| Enable Threshold | VEN(ON) = 0.9–1.5 V, VEN(OFF) = 0.6–1.4 V with 200 mV hysteresis - compatible with 1.8 V or 3.3 V GPIO control without level-shifting. |
| Error Flag Threshold | Asserts low when VOUT falls below 74–93% of 1.8 V - provides deterministic fault signaling for host processor reset or throttling decisions. |
Pinout & Package
LP38511TS-1.8/NOPB is housed in a thermally enhanced DDPAK/TO-263 (KTT) 5-pin surface-mount package. The exposed thermal pad (TAB) is electrically connected to Pin 3 (GND) and must be soldered to a PCB copper pour for effective heat dissipation (θJC = 3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable control input | Active-high logic input with no internal bias; requires external pull-up to VIN or active drive; controls regulator output and ERROR flag state. |
| 2 - IN | Input supply connection | Accepts 2.25 V to 5.5 V; feeds internal PMOS pass element and bias circuitry; must be decoupled with ≥10 µF ceramic capacitor. |
| 3 - GND | Power ground reference | Common return for input/output currents and internal circuitry; tied internally to exposed thermal tab for thermal conduction. |
| 4 - OUT | Regulated output terminal | Delivers 1.8 V at up to 800 mA; requires ≥10 µF ceramic capacitor placed within 1 cm for stability and transient performance. |
| 5 - ERROR | Open-drain fault indicator | Drives low when VOUT drops >15% below 1.8 V; requires external 10 kΩ–1 MΩ pull-up to VIN; forced low when EN = low. |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | Stabilizes within microseconds after 10 mA ↔ 800 mA load steps - prevents core voltage droop during burst-mode processing. |
| Ultra-low-noise operation | 75 µVrms output noise (100 Hz–100 kHz) - avoids jitter injection into PLLs or ADC reference paths powered by this LDO. |
| Thermal and current protection | 165°C junction shutdown with 10°C hysteresis and cycle-by-cycle current limiting - prevents catastrophic failure under overload or poor heatsinking. |
| Minimal external components | Stable with only two 10 µF X7R/X5R ceramic capacitors - reduces BOM count, board area, and cost versus traditional LDOs requiring tantalum or larger ceramics. |
| Reverse-voltage tolerance | Withstands 500 mV reverse bias across IN–OUT via parasitic diode - protects against backfeed during power sequencing or hot-swap events. |
Applications
| FPGA Core Power Supply | DSP Voltage Rail Regulation |
|---|---|
|
Use Scenario: Powers 1.8 V I/O banks and configuration logic in Xilinx Artix-7 or Intel Cyclone V FPGAs during dynamic reconfiguration and high-speed data transfers. IC Role / Device Role / Timing Role: Primary low-noise, fast-response post-regulator delivering clean 1.8 V from a shared 3.3 V intermediate rail. Use Value: Maintains <±2.5% output accuracy across temperature and load while rejecting ripple from upstream buck converters via 40 dB PSRR at 100 kHz. |
Use Scenario: Supplies 1.8 V core voltage to TI C6000 DSPs in radar signal processing modules where transient-induced voltage sag causes FFT corruption. IC Role / Device Role / Timing Role: Fast-transient LDO ensuring stable core voltage during burst-mode FFT execution with 10 mA → 800 mA current steps. Use Value: Sub-µs recovery from load transients prevents timing violations in synchronous logic, verified by load-step waveforms in Figure 15–19. |
| Server Memory Subsystem | Industrial Control CPU Core |
|
Use Scenario: Regulates 1.8 V DDR2 memory termination voltage (VTT) in enterprise storage controllers with strict ±3% tolerance requirements. IC Role / Device Role / Timing Role: Precision LDO providing tightly regulated VTT referenced to DDR2 VDDQ, monitored via ERROR flag for system-level fault logging. Use Value: ±2.5% VOUT accuracy and 0.25%/A load regulation ensure VTT stays within JEDEC-specified limits across full operating temperature range. |
Use Scenario: Powers ARM Cortex-A9 core in ruggedized PLC CPUs operating continuously at 85°C ambient with no forced airflow. IC Role / Device Role / Timing Role: Thermally robust LDO using DDPAK thermal pad to sustain 800 mA at elevated ambient via θJA = 60°C/W and 165°C thermal shutdown. Use Value: Enables extended lifetime operation without derating - validated per Operating Ratings (−40°C to +125°C junction) and thermal curves in Figure 26. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LPGEDR | 7-channel 100 mA sink driver with integrated LDO; no ERROR flag; 1.8 V output not available - nearest is 3.3 V. | Designed for LED/relay driving, not precision core regulation; lacks fast transient response and tight DC accuracy. | Select only if multi-channel sinking + basic regulation suffices and 1.8 V output is not required. |
| TPS7A2018PDQNR | 1.8 V, 300 mA LDO with 12 µVrms noise and 0.5% accuracy; smaller DQN package; no ERROR flag; 250 mV dropout @ 300 mA. | Better noise/accuracy for RF/analog sections; insufficient current for FPGA cores; no fault reporting capability. | Prefer for low-noise analog rails where 300 mA suffices and ERROR signaling is unnecessary. |
Compared with LP38511TS-1.8/NOPB, TPS7A2018PDQNR offers superior noise and accuracy but half the current capacity and no fault flag, while TPL7407LPGEDR serves entirely different functional roles - neither matches the LP38511TS-1.8/NOPB's combination of 800 mA, 1.8 V, fast transient response, and integrated ERROR monitoring in a thermally optimized package.
Availability
LP38511TS-1.8/NOPB is available at Aetrix Electronics and suitable for FPGA core power supplies, DSP voltage rails, DDR2 memory subsystems, industrial CPU cores, and telecom base station logic regulation requiring stable component supply, long-term lifecycle support, and RoHS-exempt manufacturing compliance.
Supply support for LP38511TS-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 power regulation solutions.
The LP38511TS-1.8/NOPB belongs to TI's LP385xx family of fast-transient LDOs engineered specifically for powering digital cores in servers, networking equipment, and high-intensity computing systems where voltage accuracy, speed, and thermal resilience are critical.
FAQ
What is the minimum input voltage required for LP38511TS-1.8/NOPB to maintain regulation?
The LP38511TS-1.8/NOPB requires a minimum input voltage of 2.25 V to operate within specification. At 800 mA load, its dropout voltage is 135 mV, meaning VIN must remain ≥1.935 V to sustain 1.8 V output - however, the absolute minimum specified VIN is 2.25 V to guarantee full performance including PSRR, accuracy, and transient response across temperature.
Does LP38511TS-1.8/NOPB require an external pull-up resistor on the ERROR pin?
Yes, LP38511TS-1.8/NOPB requires an external pull-up resistor on the ERROR pin because it features an open-drain output stage. A resistor between 10 kΩ and 1 MΩ connected to VIN is recommended; pulling up to a voltage higher than VIN may cause unintended current flow through an internal parasitic diode and must be avoided.
Can LP38511TS-1.8/NOPB be used with aluminum electrolytic output capacitors?
LP38511TS-1.8/NOPB is optimized for 10 µF ceramic output capacitors (X7R/X5R dielectric) and is not guaranteed stable with aluminum electrolytics alone. However, the datasheet permits adding 100 µF aluminum in parallel with the 10 µF ceramic (Figure 17–18), improving bulk energy storage while preserving loop stability - never substitute ceramic with aluminum.
What happens to the ERROR flag when the EN pin is pulled low?
When the EN pin is pulled low, LP38511TS-1.8/NOPB disables its regulator and forces the ERROR flag low immediately - regardless of actual output voltage. This behavior ensures unambiguous fault signaling during controlled shutdown sequences and prevents false ERROR assertions during power-down transitions.
Is LP38511TS-1.8/NOPB pin-compatible with LP38511TJ-1.8/NOPB?
Yes, LP38511TS-1.8/NOPB and LP38511TJ-1.8/NOPB share identical pinout, electrical specifications, and functional behavior - differing only in package variant (DDPAK/TO-263 KTT vs. TO-263 NDQ) and moisture sensitivity level (MSL 3 vs. MSL 1). Both use the same 5-pin layout with EN, IN, GND, OUT, ERROR assignments and thermally connected GND tab.
LP38511TS-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):
- 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)
LP38511TS-1.8/NOPB FAQ
1.How can I place an order for LP38511TS-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38511TS-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 LP38511TS-1.8/NOPB reliable?
The price and inventory of LP38511TS-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 LP38511TS-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LP38511TS-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38511TS-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38511TS-1.8/NOPB?
LP38511TS-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38511TS-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 LP38511TS-1.8/NOPB?
For technical support, including LP38511TS-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38511TS-1.8/NOPB requirements.
6.How does Aetrix verify that LP38511TS-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38511TS-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 LP38511TS-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LP38511TS-1.8/NOPB?
All LP38511TS-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38511TS-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 LP38511TS-1.8/NOPB part is unused and in its original packaging.
Return procedure for LP38511TS-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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