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Texas Instruments LM2590HVS-ADJ
- Part No.:
- LM2590HVS-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2590HVS-ADJ.pdf
- Description:
- IC REG BUCK ADJ 1A TO263
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM2590HVS-ADJ from Texas Instruments is a monolithic 150-kHz non-synchronous step-down DC-DC converter IC designed for high-input-voltage industrial and automotive power supplies. It delivers up to 1 A output current with ±4% output voltage accuracy, supports input voltages up to 60 V, and features adjustable output (1.2 V to 57 V), internal soft-start, shutdown control, and out-of-regulation error flag. It is commonly used in on-card buck regulators powering microcontrollers or sensors from unregulated 12–48 V rails.
For engineers reviewing the LM2590HVS-ADJ datasheet, LM2590HVS-ADJ pinout, LM2590HVS-ADJ application, or LM2590HVS-ADJ equivalent, key selection considerations include its 7-pin TO-263 package thermal performance (RθJA = 20°C/W with 3 in² copper), 90 µA standby current, 1.23 V feedback reference, 150 kHz fixed-frequency operation, and integrated protection including thermal shutdown and two-stage current limiting.
Technical Context
The LM2590HVS-ADJ implements a fixed-frequency PWM buck topology with internal 150 kHz oscillator, voltage-mode control loop, and 1.23 V precision bandgap reference. Its feedback pin senses output via external resistor divider, enabling precise output programming across 1.2–57 V while maintaining ±4% regulation over line, load, and temperature (–40°C to +125°C).
It integrates dedicated functional blocks: a 7-V clamped SD/SS pin supporting both shutdown (≤0.6 V) and soft-start (capacitor-based ramp), a delay pin with 3 µA current source for programmable power-good assertion timing, and an open-collector flag pin that asserts low (<1 V, 3 mA sink) when output drops below 95% of nominal-enabling system-level power sequencing and fault monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 60 V - supports wide-range industrial inputs including 24 V, 36 V, and 48 V DC systems without pre-regulation. |
| Output Current | 1 A continuous - sufficient to power mid-complexity microcontrollers, FPGAs, or analog front-ends directly. |
| Feedback Reference | 1.23 V ±2.7% - sets output voltage via R1/R2 divider; enables stable 1.2–57 V adjustment with minimal external components. |
| Switching Frequency | 150 kHz ±15% - allows use of compact, low-cost 33–100 µH inductors and reduces EMI compared to lower-frequency alternatives. |
| Standby Quiescent Current | 90 µA typical at VIN = 60 V - enables ultra-low-power shutdown mode suitable for battery-backed or energy-sensitive systems. |
| Thermal Resistance (RθJA) | 20°C/W - achieved with TO-263 package mounted on double-sided PCB with 3 in² copper on LM2590HVS-ADJ side and 16 in² on opposite side; enables full 1 A load at +125°C ambient. |
| Oscillator Accuracy | ±15% - ensures predictable filter sizing and consistent transient response across temperature and process variation. |
Pinout & Package
LM2590HVS-ADJ is housed in a 7-pin TO-263 (KTW) surface-mount package with exposed thermal pad. The package measures 10.10 mm × 8.89 mm and provides low thermal resistance (RθJC = 2°C/W) for efficient heat transfer to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Positive input supply | Accepts 4.5–60 V unregulated DC; requires ≥330 µF low-ESR input capacitor to handle high peak switching currents and suppress transients. |
| 2 - Output | Internal power switch drain | Drives external catch diode and inductor; swings between ~VIN–0.95 V (ON) and ~–0.5 V (OFF); must be routed with short, low-inductance traces. |
| 3 - Flag | Open-collector error flag | Asserts low (<1 V, 3 mA sink) when regulated output falls below 95%; requires external pull-up (e.g., 4.7 kΩ to VOUT) and clamping if pulled above 45 V. |
| 4 - GND | Power and signal ground | Common return for internal circuitry, switch node, and feedback network; must connect to low-impedance ground plane near thermal pad. |
| 5 - Delay | Flag assertion delay control | Charged by 3 µA internal current source; time to flag high determined by CDELAY (e.g., 0.1 µF → ~430 ms delay); rapidly discharged on fault. |
| 6 - Feedback | Voltage sense input | Compares divided output against 1.23 V reference; bias current ≤50 nA enables high-resistor-divider designs with minimal loading error. |
| 7 - SD/SS | Shutdown/Soft-start control | Pulled internally high; drives low (≤0.6 V) for shutdown (90 µA IQ); capacitor here sets soft-start ramp time (5 µA charge below 1.3 V, 1.6 µA above). |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output range | 1.2 V to 57 V with ±4% tolerance - enables single BOM for multiple output voltages across diverse subsystems. |
| Integrated soft-start | Capacitor-programmable startup ramp - prevents inrush current and stabilizes upstream supplies during power-up. |
| Out-of-regulation flag with delay | Configurable power-good timing and fault detection - supports safe system boot sequencing and watchdog-triggered recovery. |
| Two-stage current limit | Peak switch current limit (1.9 A typ.) plus foldback - protects against short-circuit and overload without latch-up or thermal runaway. |
| Thermal shutdown | Automatic shutdown at TJ ≥150°C with hysteresis - ensures robust operation under sustained overload or poor heatsinking. |
Applications
| Industrial PLC I/O Module Power | Automotive Body Control Unit (BCU) |
|---|---|
Use Scenario: Powers isolated analog sensor interfaces and digital I/O drivers from 24 V DC bus in harsh factory environments. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3 V or 5 V to MCU and ADC; handles wide input transients (ISO 16750-2 pulses) and operates continuously at +85°C ambient. Use Value: 60 V max input withstands load-dump events; ±4% regulation maintains ADC reference accuracy; TO-263 thermal performance avoids external heatsink. | Use Scenario: Supplies 5 V to microcontroller, CAN transceiver, and LED drivers in door module or lighting control unit. IC Role / Device Role / Timing Role: On-board step-down regulator converting vehicle battery (9–16 V nominal, up to 40 V during load dump) to clean 5 V rail. Use Value: 90 µA shutdown current extends battery life in sleep mode; error flag signals MCU on undervoltage or overtemperature; soft-start prevents CAN bus reset during ignition. |
| Ruggedized Medical Instrument Supply | Telecom Remote Radio Unit (RRU) |
Use Scenario: Generates 12 V and 3.3 V rails from 48 V backplane in portable diagnostic equipment requiring high reliability and low EMI. IC Role / Device Role / Timing Role: Pre-regulator feeding linear post-regulators; operates at fixed 150 kHz to simplify EMI filtering and avoid sensitive RF bands. Use Value: Fixed-frequency operation enables predictable filter design; 1 A output supports dual-rail generation with minimal external parts; thermal shutdown prevents field failures. | Use Scenario: Provides 3.3 V bias to FPGA and RF front-end ICs in outdoor base station radios powered from -48 V telecom supply. IC Role / Device Role / Timing Role: High-input-voltage buck converter stepping down from derived +48 V intermediate bus to logic supply. Use Value: 60 V rating accommodates +48 V transients; 150 kHz frequency avoids interference with LTE/5G bands; TO-263 package enables conduction cooling on metal enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2590HV-5.0 | Fixed 5 V output; no feedback divider required; same pinout and thermal specs. | Eliminates external resistors but lacks output flexibility; unsuitable for variable-voltage designs. | Select when 5 V is fixed requirement and board space is constrained-reduces BOM count and layout complexity. |
| LM2596HV-ADJ | Higher 150 kHz frequency tolerance (±15% vs. ±15%); identical 60 V input and 1 A rating; shares same TO-263 footprint. | Offers improved light-load efficiency and tighter output tolerance (±2% vs. ±4%) but requires revalidation of compensation network. | Choose for new designs needing higher precision or better efficiency at partial load; verify stability with existing LC filter values. |
Compared with LM2590HV-5.0, LM2590HVS-ADJ trades simplicity for flexibility-enabling one design to support multiple outputs-but adds two resistors and a feedforward capacitor. Versus LM2596HV-ADJ, it offers proven ruggedness in legacy industrial deployments but with looser output tolerance and slightly lower efficiency at light loads.
Availability
LM2590HVS-ADJ is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and telecom infrastructure requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.
Supply support for LM2590HVS-ADJ 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 technologies with over 90 years of innovation in industrial, automotive, and communications markets.
The LM2590HV series was developed as part of TI's SIMPLE SWITCHER® portfolio to deliver robust, easy-to-use DC-DC conversion for high-input-voltage applications where reliability, thermal performance, and minimal external components are critical.
FAQ
What is the maximum input voltage rating for LM2590HVS-ADJ?
The LM2590HVS-ADJ has an absolute maximum input voltage rating of 63 V and a recommended operating range of 4.5 V to 60 V. Operation beyond 60 V risks exceeding internal device limits and is not guaranteed for reliability or lifetime. For 48 V telecom or 36 V automotive systems, this margin provides robustness against transients like ISO 16750-2 load dump.
How do I calculate the output voltage for LM2590HVS-ADJ?
The output voltage of LM2590HVS-ADJ is set by a resistor divider from VOUT to FB (pin 6) and from FB to GND. Use VOUT = 1.23 V × (1 + R1/R2), where R2 connects FB to GND and R1 connects VOUT to FB. Select R2 ≈ 1 kΩ for stability; standard 1% resistors ensure accuracy within the ±4% total output tolerance specified for LM2590HVS-ADJ.
Does LM2590HVS-ADJ require an external catch diode?
Yes, LM2590HVS-ADJ requires an external Schottky catch diode (e.g., 1N5824 or equivalent) connected from the Output pin (pin 2) to GND. This diode provides the return path for inductor current during the switch OFF cycle. Using a low-forward-voltage, fast-recovery Schottky minimizes conduction loss and improves efficiency-especially critical at high input voltages where diode dissipation dominates losses.
What thermal derating applies to LM2590HVS-ADJ at elevated ambient temperatures?
LM2590HVS-ADJ is rated for junction temperatures up to 150°C. With its TO-263 package and 20°C/W RθJA (double-sided PCB), it delivers full 1 A output up to +125°C ambient. Above that, output current must be reduced linearly: at +135°C ambient, maximum load is ~0.5 A; at +145°C, ~0.25 A. Thermal shutdown activates at TJ ≥150°C to prevent damage.
Can LM2590HVS-ADJ be synchronized to an external clock?
No, LM2590HVS-ADJ does not support external clock synchronization. It uses an internal fixed-frequency 150 kHz oscillator with ±15% tolerance. For noise-sensitive applications requiring frequency control or EMI reduction, consider alternatives such as the LM5117 or TPS54302, which offer sync-in capability-LM2590HVS-ADJ prioritizes simplicity and ruggedness over programmability.
LM2590HVS-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 57V
- 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)
LM2590HVS-ADJ FAQ
1.How can I place an order for LM2590HVS-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2590HVS-ADJ 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 LM2590HVS-ADJ reliable?
The price and inventory of LM2590HVS-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2590HVS-ADJ is usually 5 days.
3.What payment methods are accepted for LM2590HVS-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2590HVS-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2590HVS-ADJ?
LM2590HVS-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2590HVS-ADJ 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 LM2590HVS-ADJ?
For technical support, including LM2590HVS-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2590HVS-ADJ requirements.
6.How does Aetrix verify that LM2590HVS-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2590HVS-ADJ 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 LM2590HVS-ADJ meets industry standards.
7.What is the process for return or replacement of LM2590HVS-ADJ?
All LM2590HVS-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2590HVS-ADJ, 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 LM2590HVS-ADJ part is unused and in its original packaging.
Return procedure for LM2590HVS-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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