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Texas Instruments LM2590HVSX-3.3
- Part No.:
- LM2590HVSX-3.3
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2590HVSX-3.3.pdf
- Description:
- IC REG BUCK 3.3V 1A TO263
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM2590HVSX-3.3 from Texas Instruments is a monolithic 1-A, 150-kHz non-synchronous step-down (buck) DC-DC converter with fixed 3.3-V output, 4.5–60 V input range, ±4% output voltage tolerance over line/load/temperature, and integrated shutdown/soft-start and error flag functions. It delivers stable power in industrial power supplies, automotive subsystems, and embedded systems requiring high-input-voltage regulation.
For engineers reviewing the LM2590HVSX-3.3 datasheet, LM2590HVSX-3.3 pinout, LM2590HVSX-3.3 application, or LM2590HVSX-3.3 equivalent, key selection criteria include its 60-V max input rating, 1-A guaranteed load current, 90 µA standby quiescent current, thermal shutdown protection, and TO-263-7 surface-mount package compatibility with high-reliability PCB layouts.
Technical Context
The LM2590HVSX-3.3 integrates a fixed-frequency 150-kHz oscillator, internal compensation, and a bipolar NPN power switch with 1.2 V typical saturation voltage at 1 A. Its control architecture uses voltage-mode PWM with undervoltage lockout, two-stage current limiting, and thermal shutdown to ensure robust operation under fault conditions.
It features dedicated pins for error flag assertion (open-collector, ≤1 V low), programmable power-up delay via external capacitor on Delay pin, and shutdown/soft-start control via SD/SS pin with 1.3 V threshold and 5 µA soft-start charging current-enabling precise sequencing and inrush current management in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over –40°C to +125°C, 4.5–60 V input, 0.2–1 A load - ensures stable logic supply for microcontrollers and FPGAs without external feedback resistors. |
| Max Input Voltage | 60 V - supports direct connection to 48-V industrial buses, automotive battery transients, and unregulated AC/DC front-ends. |
| Switching Frequency | 150 kHz (±15%) - enables use of compact 33–68 µH inductors and reduces EMI compared to lower-frequency alternatives. |
| Output Current | 1 A guaranteed - sufficient for powering SoCs, sensors, and communication interfaces in space-constrained designs. |
| Quiescent Current | 90 µA typical in shutdown - minimizes standby power loss in always-on applications like telematics or remote monitoring. |
| Thermal Protection | Internal thermal shutdown at 150°C junction - prevents permanent damage during overload or poor heatsinking. |
| Package | TO-263-7 (KTW) - surface-mount thermally enhanced package with exposed tab for direct PCB copper thermal spreading (RθJA = 20°C/W with 3 in² double-sided copper). |
Pinout & Package
LM2590HVSX-3.3 is housed in a 7-pin TO-263 (KTW) thermally enhanced surface-mount package with an exposed metal tab for efficient heat dissipation. The package measures 10.10 mm × 8.89 mm and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Positive input supply | Accepts 4.5–60 V DC; requires ≥330 µF low-ESR input capacitor to handle switching current transients and reduce ripple. |
| 2 - Output | Internal NPN switch collector | Swings between ~VIN–0.95 V and –0.5 V; connects to catch diode anode and inductor input - forms main power path. |
| 3 - Flag | Open-collector error flag | Asserts low (≤1 V) when output drops below 95% of 3.3 V; sinks up to 3 mA; requires external pull-up resistor (e.g., 4.7 kΩ to VOUT). |
| 4 - GND | Circuit ground reference | Common return for internal circuitry, feedback, and thermal pad; must be connected to large PCB copper area for thermal and noise performance. |
| 5 - Delay | Flag delay timing node | Charged by 3 µA internal current source; flag goes high after capacitor voltage exceeds 1.25 V - sets power-good assertion delay (e.g., 0.1 µF ≈ 42 ms). |
| 6 - Feedback | Output voltage sense | Internally tied to output for fixed 3.3-V version; not user-configurable - eliminates resistor divider errors and layout sensitivity. |
| 7 - SD/SS | Shutdown/Soft-start control | Drives low (≤0.6 V) for shutdown (90 µA IQ); floats or pulled high (≥2 V) for operation; capacitor here controls output ramp rate. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated soft-start | Programmable output voltage ramp via external capacitor on SD/SS pin - prevents inrush current and stabilizes upstream supplies. |
| Power-good flag with delay | Open-collector Flag pin asserts after user-defined delay (via CDELAY) - enables safe sequencing of downstream logic and memory. |
| High-input-voltage capability | 60 V absolute maximum input - eliminates need for pre-regulation in 24/48-V industrial and automotive applications. |
| Robust protection suite | Thermal shutdown, two-stage current limit, and undervoltage lockout - ensures reliable operation across temperature and load extremes. |
| Low-standby-power shutdown | 90 µA typical IQ in shutdown - extends battery life in portable or energy-harvesting systems. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Converting 24-V or 48-V rail to clean 3.3-V for PLC I/O modules and sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 3.3-V power with built-in fault signaling to system controller. Use Value: Eliminates external feedback network and simplifies layout while maintaining ±4% output accuracy across wide temperature and load ranges. | Use Scenario: Powering CAN transceivers, microcontrollers, and LED drivers in door modules and seat controllers. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator with error flag used for diagnostics and fail-safe shutdown. Use Value: Withstands automotive load-dump transients up to 60 V and provides power-good indication for ECU boot sequencing. |
| Telecom Remote Radio Unit | Test & Measurement Equipment |
Use Scenario: Generating 3.3-V bias for RF amplifiers and ADCs in outdoor base station radios powered from 48-V PoE or DC plant. IC Role / Device Role / Timing Role: Primary DC-DC converter with thermal shutdown and current limiting for field-replaceable units. Use Value: TO-263 package enables direct thermal coupling to heatsink; 150-kHz switching allows compact filter design in space-constrained enclosures. | Use Scenario: Providing isolated 3.3-V supply for digital logic in portable oscilloscopes and multimeters with battery backup. IC Role / Device Role / Timing Role: Efficient buck regulator operating from wide-input battery or adapter sources, with shutdown mode for extended idle periods. Use Value: 90 µA shutdown current minimizes battery drain; fixed 3.3-V output ensures consistent logic-level compatibility without trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2590T-3.3 | TO-220-7 package; higher RθJA (50°C/W vs. 20°C/W); identical electrical specs. | Suitable for prototyping or low-volume through-hole assembly; less suitable for high-density or thermally constrained PCBs. | Select LM2590T-3.3 only when manual soldering or vertical heatsink mounting is preferred over surface-mount thermal management. |
| LM2596SX-3.3 | Lower max input (40 V vs. 60 V); 150-kHz frequency; same TO-263-5 pinout but different pin functions (no Flag/Delay pins). | Lacks error flag and delay functionality; cannot support power-good sequencing or fault reporting in safety-critical systems. | Choose LM2596SX-3.3 only for cost-sensitive, non-sequenced applications where 40-V input ceiling is acceptable and flag signaling is unnecessary. |
Compared with LM2590T-3.3, LM2590HVSX-3.3 offers superior thermal performance in surface-mount layouts; compared with LM2596SX-3.3, it adds critical supervisory features and 20-V higher input headroom - making it the only option among the three for 48-V industrial or automotive applications requiring fault detection.
Availability
LM2590HVSX-3.3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and telecom remote radio units requiring stable component supply with long-term manufacturability and thermal reliability.
Supply support for LM2590HVSX-3.3 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs for industrial, automotive, and communications markets.
The LM2590HV product line was designed specifically for high-input-voltage DC-DC conversion in harsh environments - delivering 1-A regulated output with integrated protection, sequencing, and diagnostic features in rugged TO-220 and TO-263 packages.
FAQ
What is the maximum input voltage rating for LM2590HVSX-3.3?
The LM2590HVSX-3.3 has an absolute maximum input voltage rating of 63 V, with recommended operation up to 60 V. This enables direct use with 48-V industrial buses and automotive battery systems including load-dump transients. Exceeding 60 V continuously may reduce reliability or trigger internal protection, so design margins should maintain VIN ≤60 V under all operating conditions for the LM2590HVSX-3.3.
Does LM2590HVSX-3.3 require external feedback resistors?
No, the LM2590HVSX-3.3 is a fixed-output variant with internal feedback network set to 3.3 V. Pin 6 (Feedback) is internally connected to the output, eliminating external resistors and associated layout sensitivity. This simplifies design, improves accuracy (±4% over temperature and load), and reduces bill-of-materials cost compared to adjustable versions that require precision resistor dividers.
How does the Flag pin function on LM2590HVSX-3.3?
The Flag pin (Pin 3) on LM2590HVSX-3.3 is an open-collector output that pulls low (≤1 V) when the regulated output falls below 95% of 3.3 V (i.e., <3.135 V), indicating out-of-regulation. It sinks up to 3 mA and requires an external pull-up resistor (e.g., 4.7 kΩ to VOUT). When asserted, it signals fault conditions to microcontrollers or supervisors - a core diagnostic feature unique to the LM2590HV family and present on the LM2590HVSX-3.3.
What thermal performance can be expected from LM2590HVSX-3.3 in TO-263 package?
In the TO-263-7 (KTW) package, LM2590HVSX-3.3 achieves a junction-to-ambient thermal resistance (RθJA) of 20°C/W when mounted on a double-sided PCB with 3 in² copper on the component side and 16 in² on the opposite side. This allows continuous 1-A operation at ambient temperatures up to +85°C without external heatsink - verified per TI's SNVS084C datasheet thermal characterization for the LM2590HVSX-3.3.
Can LM2590HVSX-3.3 be used in synchronous rectification designs?
No, LM2590HVSX-3.3 is a non-synchronous buck regulator with an internal NPN bipolar transistor switch and requires an external catch diode (e.g., 1N5824). It does not support synchronous rectification because it lacks a second gate driver output or complementary switch control. For synchronous operation, designers must select alternatives such as the TPS54302 or LM5115 - the LM2590HVSX-3.3 is intentionally optimized for simplicity and high-voltage robustness, not peak efficiency.
LM2590HVSX-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-7)
LM2590HVSX-3.3 FAQ
1.How can I place an order for LM2590HVSX-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2590HVSX-3.3 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 LM2590HVSX-3.3 reliable?
The price and inventory of LM2590HVSX-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2590HVSX-3.3 is usually 5 days.
3.What payment methods are accepted for LM2590HVSX-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2590HVSX-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2590HVSX-3.3?
LM2590HVSX-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2590HVSX-3.3 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 LM2590HVSX-3.3?
For technical support, including LM2590HVSX-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2590HVSX-3.3 requirements.
6.How does Aetrix verify that LM2590HVSX-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2590HVSX-3.3 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 LM2590HVSX-3.3 meets industry standards.
7.What is the process for return or replacement of LM2590HVSX-3.3?
All LM2590HVSX-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2590HVSX-3.3, 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 LM2590HVSX-3.3 part is unused and in its original packaging.
Return procedure for LM2590HVSX-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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