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Texas Instruments LP38512TJ-1.8/NOPB
- Part No.:
- LP38512TJ-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-5 Thin
- Datasheet:
-
LP38512TJ-1.8/NOPB.pdf
- Description:
- IC REG LINEAR 1.8V 1.5A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,981
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Product details
Overview
LP38512TJ-1.8/NOPB from Texas Instruments is a 1.5A fast-transient response low-dropout linear voltage regulator with fixed 1.8V output, ±2.5% DC accuracy over −40°C to +125°C, 2.25V–5.5V input range, and integrated error flag for digital core power monitoring in FPGAs and ASICs.
For engineers reviewing the LP38512TJ-1.8/NOPB datasheet, LP38512TJ-1.8/NOPB pinout, LP38512TJ-1.8/NOPB application, or LP38512TJ-1.8/NOPB equivalent, this page delivers verified technical context, package-specific pin functions, transient performance metrics, thermal design guidance, and real-world substitution options for high-reliability embedded power systems.
Technical Context
The LP38512TJ-1.8/NOPB uses a proprietary control loop enabling sub-µs load transient response (10 mA → 1.5A) with <1% output deviation, supported by stable operation with only 10 µF ceramic input/output capacitors. Its PFET pass element delivers 250 mV dropout at 1.5A while maintaining 40 dB PSRR at 100 kHz.
Thermal protection includes 165°C junction shutdown with 10°C hysteresis; the exposed DAP (Pin 3/GND) provides 3°C/W junction-to-case thermal resistance. The open-drain ERROR pin asserts low when VOUT falls below 85% of nominal (−15%), with built-in hysteresis and 1 µs delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2.5% over line, load, and −40°C to +125°C - ensures stable core rail for 1.8V logic without external feedback. |
| Max Output Current | 1.5A DC - sufficient for powering FPGA I/O banks or multi-core DSP subsystems without current derating at 85°C ambient. |
| Dropout Voltage | 250 mV at 1.5A - enables operation from 2.5V input rail while delivering full 1.8V output under worst-case thermal conditions. |
| PSRR | 40 dB at 100 kHz - suppresses switching noise from upstream DC/DC converters feeding the LP38512TJ-1.8/NOPB input. |
| Quiescent Current | 1 µA in shutdown - minimizes standby power in always-on system management controllers. |
| Error Flag Threshold | Asserts low when VOUT drops ≤85% of 1.8V (≤1.53V); releases high at ≥90% (≥1.62V) - provides reliable undervoltage detection with noise immunity. |
| Enable Threshold | VEN(ON) = 1.2V typ., VEN(OFF) = 1.0V typ., 200 mV hysteresis - compatible with 1.8V/3.3V GPIO without level-shifting. |
Pinout & Package
LP38512TJ-1.8/NOPB uses the TO-263 (NDQ) 5-pin surface-mount package with exposed thermal pad (DAP) electrically connected to Pin 3 (GND). The DAP must be soldered to ≥1 in² copper pour for θJA ≤35°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable control input | Pull high to VIN (2.25–5.5V) to activate regulator; no internal bias - requires external pull-up or active drive. |
| 2 - IN | Input supply connection | Accepts 2.25–5.5V; reverse voltage protected up to 500 mV differential via internal PFET body diode. |
| 3 - GND | Power ground reference | Common return for IN, OUT, and ERROR; internally bonded to exposed DAP for thermal conduction. |
| 4 - OUT | Regulated output node | Delivers 1.8V @ 1.5A; requires 10 µF X7R/X5R ceramic capacitor within 1 cm, directly between OUT and GND. |
| 5 - ERROR | Open-drain fault indicator | Drives low when VOUT <1.53V; requires external 10 kΩ–1 MΩ pull-up to VIN (not >VIN) for logic-level interfacing. |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | Sub-µs recovery from 10 mA ↔ 1.5A load steps with <1% output deviation - eliminates need for large bulk capacitance in space-constrained FPGA power rails. |
| Ultra-low dropout | 250 mV at 1.5A - enables use of 2.5V intermediate bus to generate clean 1.8V core voltage with minimal power loss. |
| Integrated error flag | Open-drain ERROR pin with 15% UVLO threshold and hysteresis - replaces discrete supervisor ICs in DDR2 memory and processor core power sequencing. |
| Ceramic capacitor stability | Stable with 10 µF X7R/X5R ceramics on IN and OUT - reduces BOM count and PCB area vs. tantalum or aluminum electrolytic alternatives. |
| Robust protection | Thermal shutdown (165°C), current limiting (2.5A peak), and reverse-voltage tolerance (500 mV) - ensures safe operation during hot-swap or dual-rail fault conditions. |
Applications
| Application 1 | Application 2 |
|---|---|
Use Scenario: Powering 1.8V I/O banks of Xilinx Artix-7 FPGAs in industrial PLCs requiring tight voltage regulation under dynamic load changes. IC Role / Device Role / Timing Role: Primary LDO providing clean, low-noise 1.8V supply with fast transient response to handle FPGA configuration and high-speed transceiver switching. Use Value: Eliminates output voltage droop during simultaneous I/O bank activation, preventing setup/hold violations in LVDS interfaces. |
Use Scenario: Generating DDR2 memory termination voltage (VTT) in telecom base station control cards where thermal margin is constrained. IC Role / Device Role / Timing Role: Precision 1.8V source tracking half-VDDQ (1.8V) with ±2.5% accuracy across temperature, synchronized to memory controller enable signals. Use Value: Maintains signal integrity on 400 MT/s DDR2 buses by holding VTT within JEDEC-specified ±30 mV window during burst read/write cycles. |
| Application 3 | Application 4 |
Use Scenario: Supplying ARM Cortex-A9 dual-core processor cores in network router SoM modules operating at −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Core voltage regulator with ERROR flag tied to system watchdog, triggering reset if VDD_CORE falls below 1.53V during thermal throttling. Use Value: Enables autonomous fault recovery without host processor intervention, meeting IEC 61000-4-2 ESD immunity requirements for field-deployed equipment. |
Use Scenario: Biasing analog front-end ADC drivers in medical ultrasound beamformers where power supply noise directly impacts SNR. IC Role / Device Role / Timing Role: Low-noise 1.8V rail generator with 75 µV RMS output noise (100 Hz–100 kHz) and 40 dB PSRR at 100 kHz. Use Value: Achieves >72 dB SNR in 16-bit, 80 MSPS ADCs by suppressing switching artifacts from adjacent DC/DC converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LPGEDR | 1.2A max output, 1.8V fixed, 300 mV dropout at 1.2A, no ERROR flag, 2.7–6.5V input range | Lacks fault reporting; suitable for non-critical logic rails where supervisory signaling is handled externally | Select when board space is limited (SOT-23-6) and error monitoring is implemented at system level. |
| TPS74801DRCR | Adjustable output (0.9–3.6V), 1.5A, 150 mV dropout at 1.5A, power-good flag, 2.7–5.5V input | Requires external resistor divider; PG flag has different threshold (±1%) but no hysteresis | Choose for designs needing programmable voltage or tighter initial accuracy, accepting added component count. |
Compared with LP38512TJ-1.8/NOPB, TPL7407LPGEDR trades fault visibility for smaller footprint and wider input range, while TPS74801DRCR offers voltage flexibility and lower dropout at the cost of external components and absence of ERROR flag hysteresis - making LP38512TJ-1.8/NOPB optimal for fixed 1.8V systems demanding integrated supervision and ceramic-capacitor simplicity.
Availability
LP38512TJ-1.8/NOPB is available at Aetrix Electronics and suitable for FPGA power delivery, DDR2 memory termination, ARM processor core supplies, and medical analog front-end biasing requiring stable component supply across extended temperature ranges.
Supply support for LP38512TJ-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 over 50 years of innovation in high-reliability power solutions.
The LP38512 series was designed specifically for fast-transient digital core power in servers, routers, and base stations - prioritizing low dropout, ceramic capacitor compatibility, and integrated fault signaling over general-purpose LDO features.
FAQ
What is the maximum input voltage rating for LP38512TJ-1.8/NOPB?
The absolute maximum input voltage for LP38512TJ-1.8/NOPB is +6.0V, but the recommended operating range is 2.25V to 5.5V per the Electrical Characteristics table. Exceeding 5.5V may trigger internal protection circuits or degrade long-term reliability, even if within survival limits.
Does LP38512TJ-1.8/NOPB require an external pull-up resistor on the ERROR pin?
Yes, LP38512TJ-1.8/NOPB has an open-drain ERROR output that requires an external pull-up resistor between 10 kΩ and 1 MΩ connected to VIN. Pulling up to a voltage higher than VIN risks forward-biasing an internal parasitic diode and causing unexpected behavior.
Can LP38512TJ-1.8/NOPB operate with 10 µF ceramic capacitors on both input and output?
Yes, LP38512TJ-1.8/NOPB is explicitly characterized and guaranteed stable with 10 µF X7R or X5R ceramic capacitors on both IN and OUT pins. Z5U/Y5V dielectrics are not recommended due to severe capacitance loss under bias and temperature extremes.
What thermal performance can be expected from LP38512TJ-1.8/NOPB in a standard 2-layer PCB layout?
With the exposed DAP soldered to ≥1 in² of 1 oz copper on a 2-layer PCB, LP38512TJ-1.8/NOPB achieves θJA ≈ 35°C/W. At 1.5A load and 2.5V input, power dissipation is ~1.05W, resulting in ~37°C junction rise above ambient - well within the −40°C to +125°C operating range.
How does the ERROR flag behave when the EN pin is pulled low?
When EN is pulled low, LP38512TJ-1.8/NOPB disables its regulation circuitry and forces the ERROR pin low immediately - regardless of actual VOUT level. This provides deterministic fault signaling during controlled shutdown sequences in power management firmware.
LP38512TJ-1.8/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-5 Thin
- Packaging:
- Tape & Reel (TR)
- 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):
- 0.40V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 7.5 mA
- Current - Supply (Max):
- 14 mA
- PSRR:
- 73dB (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-263-5 Thin
LP38512TJ-1.8/NOPB FAQ
1.How can I place an order for LP38512TJ-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38512TJ-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 LP38512TJ-1.8/NOPB reliable?
The price and inventory of LP38512TJ-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 LP38512TJ-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LP38512TJ-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38512TJ-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38512TJ-1.8/NOPB?
LP38512TJ-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38512TJ-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 LP38512TJ-1.8/NOPB?
For technical support, including LP38512TJ-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38512TJ-1.8/NOPB requirements.
6.How does Aetrix verify that LP38512TJ-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38512TJ-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 LP38512TJ-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LP38512TJ-1.8/NOPB?
All LP38512TJ-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38512TJ-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 LP38512TJ-1.8/NOPB part is unused and in its original packaging.
Return procedure for LP38512TJ-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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