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Texas Instruments LP38500SDE-ADJ/NOPB
- Part No.:
- LP38500SDE-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LP38500SDE-ADJ/NOPB.pdf
- Description:
- IC REG LINEAR POS ADJ 1.5A 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,740
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Product details
Overview
LP38500SDE-ADJ/NOPB from Texas Instruments is an adjustable 1.5-A ultra-low-dropout linear regulator using a PMOS pass transistor, operating from 2.7 V to 5.5 V input and delivering 0.6 V to 5 V output with ±1.5% VADJ accuracy (A grade) at 25°C, 275 mV dropout at 1.5 A, and stable operation with ceramic/tantalum/aluminum capacitors - used in FPGA core power, ASIC supplies for graphics cards, and low-voltage microprocessor rails.
For engineers reviewing the LP38500SDE-ADJ/NOPB datasheet, LP38500SDE-ADJ/NOPB pinout, LP38500SDE-ADJ/NOPB application, or LP38500SDE-ADJ/NOPB equivalent, key selection criteria include verified FlexCap stability with any ESR output capacitor, confirmed 1.5-A continuous output current, documented thermal shutdown at 170°C, and validated 100 µVrms output noise performance over 100 Hz–100 kHz bandwidth.
Technical Context
The LP38500SDE-ADJ/NOPB employs internal compensation enabling unconditional stability with ceramic, tantalum, or aluminum electrolytic output capacitors - eliminating ESR constraints typical of conventional LDOs. Its PMOS pass element delivers ultra-low dropout (275 mV at 1.5 A) and enables fast load transient response via feed-forward architecture.
It features a dedicated ADJ pin with 605 mV nominal reference voltage and 750 nA max bias current, supports disable mode only in LP38502 variants (not applicable here), and includes overtemperature (170°C trip, 10°C hysteresis) and overcurrent protection. The device operates across −40°C to +125°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports direct regulation from common system rails (3.3 V, 5 V) without pre-regulation. |
| Output Voltage Range | 0.6 V to 5 V (adjustable via external resistor divider) - covers core voltages for modern FPGAs, DSPs, and ASICs. |
| Max Output Current | 1.5 A continuous - sufficient for high-current digital logic cores and I/O banks requiring stable low-noise supply. |
| Dropout Voltage | 275 mV at 1.5 A load - enables high-efficiency operation even at low VIN–VOUT differentials (e.g., 3.3 V → 3.0 V). |
| VADJ Accuracy | ±1.5% at 25°C (A grade) - ensures precise output setting critical for voltage-sensitive processors and memory interfaces. |
| Output Noise | 100 µVrms (100 Hz–100 kHz) - low enough for analog-sensitive circuits like ADC references or RF bias rails. |
| PSRR | 56 dB at 1 kHz - suppresses switching noise from upstream SMPS, enabling clean LDO post-regulation. |
| Quiescent Current | 2 mA typical at 1.5 A load - maintains efficiency under full load while avoiding excessive ground current penalties. |
Pinout & Package
LP38500SDE-ADJ/NOPB uses the DDPAK/TO-263 (KTT) 5-pin package (10.16 mm × 8.42 mm), with exposed thermal pad (DAP) electrically connected to GND and requiring PCB copper area for heatsinking. Pin 1 = N/C (no internal connection), Pin 2 = IN, Pin 3 = GND, Pin 4 = OUT, Pin 5 = ADJ.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 2) | Input supply | Main power input; shares current with other IN pins if paralleled; must be decoupled with ≥10 µF capacitor within 1 cm. |
| GND (Pin 3) | Ground reference | Primary ground return path; DAP must also connect to GND plane for thermal management and noise control. |
| OUT (Pin 4) | Regulated output | Delivers adjustable output; requires ≥10 µF output capacitor; shares current with other OUT pins if paralleled. |
| ADJ (Pin 5) | Feedback reference | Sets output voltage via resistor divider; 605 mV nominal reference; bias current ≤750 nA minimizes divider error. |
| N/C (Pin 1) | No connection | Internally unconnected; may be left floating or used for trace routing - no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| FlexCap compensation | Stable with any capacitor type (ceramic, tantalum, aluminum) and zero ESR constraint - eliminates capacitor selection risk and simplifies BOM. |
| Ultra-low dropout | 275 mV at 1.5 A - maximizes usable input voltage range and extends battery life in portable applications. |
| Fast load transient response | ≤40 mV output deviation during 0.1 A → 1.5 A step (0.5 A/µs slew) - maintains voltage integrity for burst-mode digital loads. |
| Low-noise regulation | 100 µVrms output noise (100 Hz–100 kHz) - suitable for powering precision analog circuitry without additional filtering. |
| Integrated protection | Thermal shutdown (170°C, 10°C hysteresis) and current limiting - prevents damage during overload or poor heatsinking. |
| High PSRR | 56 dB at 1 kHz - effectively attenuates ripple from upstream switchers, reducing need for multi-stage filtering. |
Applications
| FPGA Core Power Supply | ASIC Power for Graphics Cards |
|---|---|
Use Scenario: Providing clean, adjustable 0.85 V–1.2 V core voltage to Xilinx or Intel FPGA banks with dynamic current draw up to 1.5 A. IC Role / Device Role / Timing Role: Primary low-noise, high-current LDO regulator delivering tightly regulated core rail with minimal voltage droop during logic switching. Use Value: Enables reliable FPGA configuration and operation by maintaining ±1.5% output accuracy and suppressing 100 µVrms noise that could induce timing jitter or bit errors. |
Use Scenario: Powering GPU memory interface and shader logic in desktop graphics cards where 3.3 V or 5 V system rail must be stepped down to 1.1 V or 1.8 V. IC Role / Device Role / Timing Role: Post-regulator after buck converter, supplying stable low-ESR-compatible voltage to high-speed parallel buses (GDDR6, HBM). Use Value: Delivers 1.5-A peak current with <40 mV transient deviation, preventing data corruption during GPU compute bursts and supporting FlexCap capacitor flexibility on dense PCB layouts. |
| DSP Power in Set-Top Boxes | SMPS Post-Regulator for Routers |
Use Scenario: Regulating 1.2 V or 1.5 V supply for TI C6000 or Analog Devices SHARC DSPs in consumer STBs with strict thermal and noise limits. IC Role / Device Role / Timing Role: Low-quiescent-current LDO ensuring stable DSP core voltage during variable processing loads and standby modes. Use Value: Maintains 2 mA GND current at full load and 25 nA shutdown current (in LP38502 variant), extending system energy efficiency without sacrificing transient performance. |
Use Scenario: Cleaning ripple from 3.3 V buck converter output feeding Ethernet PHYs, switch controllers, and wireless SoCs in enterprise routers. IC Role / Device Role / Timing Role: High-PSRR (56 dB @ 1 kHz) noise filter improving signal integrity on high-speed serial links (PCIe, USB 3.0). Use Value: Reduces conducted EMI into sensitive RF sections and meets EN55022 Class B emissions when paired with 10 µF ceramic input/output caps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A4701RGWR | Lower noise (4.7 µVrms), higher PSRR (70 dB @ 1 kHz), but lower max current (1 A) and narrower input range (2.2 V–36 V). | Better suited for ultra-low-noise analog rails (e.g., op-amp bias, ADC reference), not high-current digital cores. | Select when noise is primary concern and load ≤1 A; avoid for 1.5-A FPGA core use. |
| MCP1826T-ADJ/DC | Same 1.5-A rating and 0.6–5 V adjustability, but requires minimum 22 µF ceramic output cap and has higher dropout (450 mV @ 1.5 A). | Less tolerant of small-output-capacitor designs; less efficient at low VIN–VOUT differentials. | Acceptable for cost-sensitive industrial designs where 175 mV higher dropout is acceptable and layout allows larger COUT. |
Compared with TPS7A4701RGWR and MCP1826T-ADJ/DC, LP38500SDE-ADJ/NOPB uniquely balances 1.5-A capability, ultra-low dropout, FlexCap stability, and mid-range noise - making it optimal for space-constrained digital systems needing robust, capacitor-agnostic regulation without sacrificing current or efficiency.
Availability
LP38500SDE-ADJ/NOPB is available at Aetrix Electronics and suitable for FPGA core power, ASIC supplies in graphics cards, and DSP power in set-top boxes requiring stable component supply, long-term manufacturability, and consistent parametric performance across production lots.
Supply support for LP38500SDE-ADJ/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 LDO design expertise and broad automotive, industrial, and computing market adoption.
The LP38500 series belongs to TI's FlexCap LDO family, engineered specifically for high-current, low-noise, capacitor-flexible regulation in digital system power rails - addressing design challenges in FPGA, ASIC, and processor-based applications where traditional LDOs impose strict capacitor ESR requirements.
FAQ
What is the maximum output current specification for LP38500SDE-ADJ/NOPB?
The LP38500SDE-ADJ/NOPB is specified for 1.5 A continuous output current across the full operating temperature range (−40°C to +125°C junction). This value is ensured per datasheet Section 6.3 and confirmed in typical characteristics plots showing stable regulation up to 1.5 A with ≤275 mV dropout. Exceeding this current triggers internal current limiting and thermal shutdown.
Does LP38500SDE-ADJ/NOPB require a specific ESR for the output capacitor?
No - LP38500SDE-ADJ/NOPB uses TI's FlexCap compensation architecture, which guarantees stability with ceramic, tantalum, or aluminum electrolytic output capacitors regardless of ESR value. This is explicitly stated in the Features section and validated in Figure 14 gain/phase plots. No minimum or maximum ESR is required, unlike conventional LDOs.
What is the dropout voltage of LP38500SDE-ADJ/NOPB at full load?
The dropout voltage of LP38500SDE-ADJ/NOPB is 275 mV at 1.5 A load and 25°C, as specified in Section 6.5 Electrical Characteristics. At higher temperatures or lower input voltages, dropout increases slightly due to RDS(on) drift, but remains ≤375 mV across full operating conditions per datasheet limits.
Can LP38500SDE-ADJ/NOPB be used with a 10-µF ceramic output capacitor?
Yes - LP38500SDE-ADJ/NOPB is explicitly characterized and guaranteed stable with a 10-µF ceramic output capacitor, as noted in Features and Section 8.2.2.3. X5R or X7R dielectric types are recommended; Z5U/Y5F ceramics are discouraged due to capacitance loss with temperature and bias voltage.
What is the adjust pin (ADJ) reference voltage and bias current for LP38500SDE-ADJ/NOPB?
The ADJ pin of LP38500SDE-ADJ/NOPB has a nominal reference voltage of 0.605 V (±1.5% for A grade) and maximum bias current of 750 nA at 1.5 A load, per Section 6.5 Electrical Characteristics. These values directly determine output voltage accuracy when calculating R1/R2 resistor values using the formula VOUT = VADJ(1 + R1/R2) + IADJR1.
LP38500SDE-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5V
- Voltage Dropout (Max):
- 0.37 @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 15 µA
- Current - Supply (Max):
- 3.5 mA
- PSRR:
- 58dB ~ 56dB (120Hz ~ 1kHz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (3x2.5)
LP38500SDE-ADJ/NOPB FAQ
1.How can I place an order for LP38500SDE-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38500SDE-ADJ/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 LP38500SDE-ADJ/NOPB reliable?
The price and inventory of LP38500SDE-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP38500SDE-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LP38500SDE-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38500SDE-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38500SDE-ADJ/NOPB?
LP38500SDE-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38500SDE-ADJ/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 LP38500SDE-ADJ/NOPB?
For technical support, including LP38500SDE-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38500SDE-ADJ/NOPB requirements.
6.How does Aetrix verify that LP38500SDE-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38500SDE-ADJ/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 LP38500SDE-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LP38500SDE-ADJ/NOPB?
All LP38500SDE-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38500SDE-ADJ/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 LP38500SDE-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LP38500SDE-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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