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Texas Instruments LP38512TSX-1.8/NOPB
- Part No.:
- LP38512TSX-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LP38512TSX-1.8/NOPB.pdf
- Description:
- IC REG LINEAR 1.8V 1.5A DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,846
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Product details
Overview
LP38512TSX-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. It delivers stable core power to digital ASICs, FPGAs, and DSPs in servers and networking equipment using only 10 µF ceramic output capacitance.
For engineers reviewing the LP38512TSX-1.8/NOPB datasheet, LP38512TSX-1.8/NOPB pinout, LP38512TSX-1.8/NOPB application, or LP38512TSX-1.8/NOPB equivalent, key selection criteria include dropout voltage (250 mV @ 1.5A), PSRR (40 dB @ 100 kHz), enable threshold hysteresis (200 mV), thermal shutdown (165°C), and compatibility with DDPAK/TO-263-5 packaging for high-power density PCB layouts.
Technical Context
The LP38512TSX-1.8/NOPB employs a proprietary control loop architecture enabling sub-µs transient response to load steps from 10 mA to 1.5A. Its PMOS pass element provides low dropout and inherent reverse-voltage protection via an integrated parasitic diode with ~500 mV forward conduction threshold.
Operation is governed by dual enable thresholds (VEN(ON) = 0.9–1.5 V, VEN(OFF) = 0.6–1.4 V) with 200 mV hysteresis, while the open-drain ERROR pin asserts low when VOUT falls below 85% of nominal (74–93% falling threshold) and releases high above 90% (78–98% rising threshold), supporting system-level fault monitoring without external comparators.
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 digital core compliance across industrial temperature range. |
| Max Output Current | 1.5 A DC - supports high-current FPGA I/O banks and processor cores without external current boosting. |
| Dropout Voltage | 250 mV typical at 1.5 A - enables operation from 2.5 V rail with ≥700 mV headroom, critical for low-voltage margin designs. |
| Input Voltage Range | 2.25 V to 5.5 V - compatible with common intermediate rails (2.5 V, 3.3 V, 5.0 V) in multi-rail systems. |
| PSRR | 40 dB at 100 kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Quiescent Current | 1 µA in shutdown - minimizes standby power in always-on subsystems such as management controllers. |
| Thermal Shutdown | 165°C with 10°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking conditions. |
| Stability | Guaranteed with ≥10 µF X7R/X5R ceramic output capacitor - eliminates need for electrolytic or tantalum, reducing board area and improving reliability. |
Pinout & Package
LP38512TSX-1.8/NOPB is packaged in DDPAK/TO-263-5 (KTT) with exposed thermal pad (DAP) electrically connected to GND (Pin 3) for enhanced thermal performance. The package supports up to 32°C/W junction-to-ambient thermal resistance on 1-inch² copper pour.
| 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; 0.9–1.5 V turn-on threshold ensures noise immunity. |
| 2 - IN | Input supply connection | Accepts 2.25–5.5 V input; must be decoupled with ≥10 µF ceramic capacitor placed within 1 cm of pin. |
| 3 - GND | Power ground reference | Primary ground return path for regulator circuitry and thermal DAP; connects internally to exposed tab for PCB heat sinking. |
| 4 - OUT | Regulated output | Delivers 1.8 V ±2.5% to load; requires ≥10 µF ceramic capacitor directly between OUT and GND with minimal trace inductance. |
| 5 - ERROR | Open-drain fault indicator | Drives low when VOUT drops <85% of nominal; requires external 10 kΩ–1 MΩ pull-up to ≤VIN; asserts within 1 µs of fault onset. |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | Sub-microsecond recovery from 10 mA ↔ 1.5 A load steps - maintains digital core voltage stability during burst-mode CPU/FPGA activity. |
| Error flag with hysteresis | 74–93% falling / 78–98% rising thresholds - prevents chatter during marginal output conditions and simplifies host MCU fault polling. |
| Ultra-low shutdown current | 1 µA max - enables use in battery-backed or energy-harvesting applications where quiescent power dominates system budget. |
| Integrated thermal and current protection | 165°C shutdown with 10°C hysteresis + 2.5 A short-circuit limit - eliminates need for external foldback or thermal sensors in compact designs. |
| DDPAK/TO-263-5 thermal design | θJ-C = 3°C/W - allows direct thermal coupling to PCB copper plane, enabling >1 W continuous dissipation without external heatsink. |
Applications
| ASIC Core Power | FPGA I/O Bank Supply |
|---|---|
Use Scenario: Powering 1.8 V logic domains of high-performance application-specific integrated circuits in telecom base stations. IC Role / Device Role / Timing Role: Primary low-noise, fast-response LDO delivering regulated 1.8 V to digital core logic with tight DC accuracy and transient immunity. Use Value: Maintains timing margins under dynamic load transients up to 1.5 A, preventing setup/hold violations in multi-GHz clock domains. | Use Scenario: Supplying configurable I/O banks on Xilinx or Intel FPGAs in routers and switches requiring independent 1.8 V rails. IC Role / Device Role / Timing Role: Dedicated per-bank LDO with enable control and error reporting for hot-swap and configuration sequencing. Use Value: Enables individual bank power-up/down control and real-time fault detection without adding discrete supervisors or comparators. |
| DDR2 Memory Termination | Network Processor Auxiliary Rail |
Use Scenario: Providing VTT termination voltage for DDR2 SDRAM modules in storage area networks and blade servers. IC Role / Device Role / Timing Role: Precision 1.8 V sink/source LDO tracking half-VDDQ with ±2.5% tolerance and fast transient response to data bus activity. Use Value: Ensures signal integrity on high-speed memory buses by maintaining termination voltage within JEDEC DDR2 spec limits during burst reads/writes. | Use Scenario: Generating auxiliary 1.8 V supply for packet classification engines and crypto accelerators in network processors. IC Role / Device Role / Timing Role: Secondary regulated rail with enable and error signaling for subsystem-level power management and diagnostics. Use Value: Supports firmware-controlled power gating and health monitoring of co-processors without requiring additional PMIC resources. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LADGQR | 7-channel 100 mA sink driver with integrated LDO; 1.8 V output not available - closest fixed option is 3.3 V. | Designed for LED/relay driving, not precision core regulation; lacks error flag and thermal protection. | Select only if multi-channel sinking is required and 1.8 V output is not mandatory. |
| TPS7A2018PDBVR | 1.8 V, 300 mA LDO in 5-pin SOT-23; 250 mV dropout @ 300 mA, 65 dB PSRR @ 100 kHz, no ERROR pin. | Lower current capacity and no fault reporting - suitable for low-power peripherals but not FPGA/ASIC cores. | Choose when board space is constrained and load current remains below 300 mA with no system-level fault monitoring needed. |
Compared with LP38512TSX-1.8/NOPB, TPL7407LADGQR serves a fundamentally different function (driver vs regulator), while TPS7A2018PDBVR trades 5× lower output current and missing error signaling for smaller footprint - neither offers drop-in replacement capability for 1.5 A core power applications.
Availability
LP38512TSX-1.8/NOPB is available at Aetrix Electronics and suitable for servers, routers/switches, and base stations requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing for high-reliability deployments.
Supply support for LP38512TSX-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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and communications markets.
The LP38512 series was designed specifically for high-performance digital core power delivery in infrastructure equipment, emphasizing fast transient response, wide input range, and robust fault reporting for mission-critical uptime.
FAQ
What is the maximum allowable input voltage for LP38512TSX-1.8/NOPB?
The absolute maximum input voltage for LP38512TSX-1.8/NOPB is +6.0 V, but the recommended operating range is 2.25 V to 5.5 V per the datasheet. Exceeding 5.5 V may cause permanent damage or degrade long-term reliability, even if within absolute maximum ratings. Always maintain VIN ≤ 5.5 V in normal operation to ensure LP38512TSX-1.8/NOPB meets its specified ±2.5% output accuracy and thermal performance.
Does LP38512TSX-1.8/NOPB require an external pull-up resistor on the ERROR pin?
Yes, LP38512TSX-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 a voltage ≤ VIN is mandatory for proper logic-level assertion. Pulling ERROR above VIN risks current flow through an internal parasitic diode, potentially causing malfunction - this requirement applies to all operating modes of LP38512TSX-1.8/NOPB.
Can LP38512TSX-1.8/NOPB operate with less than 10 µF output capacitance?
No, LP38512TSX-1.8/NOPB is not guaranteed stable with less than 10 µF ceramic output capacitance. The datasheet specifies ≥10 µF X7R or X5R dielectric as the minimum for loop stability across temperature and load. Using smaller values or non-ceramic types (e.g., aluminum electrolytic) may cause oscillation or excessive overshoot during transients, compromising LP38512TSX-1.8/NOPB's fast-response capability and output accuracy.
What happens to the ERROR pin when the EN pin is pulled low?
When the EN pin is pulled low, LP38512TSX-1.8/NOPB disables its regulation circuitry and forces the ERROR pin low immediately - regardless of actual output voltage. This behavior ensures unambiguous fault signaling during shutdown sequences. The ERROR pin remains low until EN rises above VEN(ON) (~0.9–1.5 V), after which LP38512TSX-1.8/NOPB resumes monitoring and reporting VOUT status.
Is LP38512TSX-1.8/NOPB RoHS compliant?
Yes, LP38512TSX-1.8/NOPB is RoHS compliant. The "/NOPB" suffix explicitly denotes lead-free (Pb-free) packaging, and TI's packaging documentation confirms RoHS compliance for this orderable part number. It meets EU Directive 2011/65/EU requirements, including restrictions on lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE, with full material declarations available in TI's official compliance database for LP38512TSX-1.8/NOPB.
LP38512TSX-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):
- 0.40V @ 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 (DDPAK-5)
LP38512TSX-1.8/NOPB FAQ
1.How can I place an order for LP38512TSX-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38512TSX-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 LP38512TSX-1.8/NOPB reliable?
The price and inventory of LP38512TSX-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 LP38512TSX-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LP38512TSX-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38512TSX-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38512TSX-1.8/NOPB?
LP38512TSX-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38512TSX-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 LP38512TSX-1.8/NOPB?
For technical support, including LP38512TSX-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38512TSX-1.8/NOPB requirements.
6.How does Aetrix verify that LP38512TSX-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38512TSX-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 LP38512TSX-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LP38512TSX-1.8/NOPB?
All LP38512TSX-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38512TSX-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 LP38512TSX-1.8/NOPB part is unused and in its original packaging.
Return procedure for LP38512TSX-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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