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Texas Instruments LM2590HVSX-3.3/NOPB
- Part No.:
- LM2590HVSX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2590HVSX-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 1A TO263
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM2590HVSX-3.3/NOPB 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, and integrated shutdown/soft-start and error flag functions. It delivers stable regulation under 0.2–1 A load across –40°C to +125°C and supports industrial power conversion in space-constrained designs using TO-263-7 package.
For engineers reviewing the LM2590HVSX-3.3/NOPB datasheet, LM2590HVSX-3.3/NOPB pinout, LM2590HVSX-3.3/NOPB application, or LM2590HVSX-3.3/NOPB equivalent, key selection criteria include ±4% output voltage tolerance over line/load/temperature, 90 µA standby current in shutdown mode, 1.2–1.3 V switch saturation voltage at 1 A, and programmable flag delay via external capacitor on Pin 5.
Technical Context
The LM2590HVSX-3.3/NOPB implements a fixed-frequency PWM buck topology with internal 150-kHz oscillator, voltage-mode control, and integrated power switch. Its feedback loop references a 1.23-V internal bandgap, with direct connection from Output (Pin 2) to Feedback (Pin 6) for fixed-output operation.
Supervisory features include open-collector Flag (Pin 3) asserting low ≤1 V when output drops below 95% of nominal, Delay (Pin 5) controlling flag assertion timing via 3 µA internal current source charging an external capacitor, and SD/SS (Pin 7) enabling shutdown (≤0.6 V) or soft-start (0–2.8 V ramp) with 5 µA/1.6 µA dual-stage charge current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over full line (4.5–60 V), load (0.2–1 A), and temperature (–40°C to +125°C) range - ensures stable logic supply without external resistor network. |
| Switching Frequency | 150 kHz (±15%) - enables use of compact 33 µH inductors and reduces EMI compared to lower-frequency alternatives. |
| Max Output Current | 1 A DC continuous - supports mid-power embedded systems without external current boosting. |
| Input Voltage Range | 4.5 V to 60 V - accommodates 12 V, 24 V, and 48 V industrial bus rails with margin for transients. |
| Standby Quiescent Current | 90 µA typical at VIN = 60 V in shutdown - minimizes battery drain in always-on monitoring applications. |
| Switch Saturation Voltage | 0.95 V typical at IOUT = 1 A - determines conduction loss and thermal rise; enables >77% efficiency at 12 V IN → 3.3 V OUT. |
| Flag Response Threshold | Asserts low when VOUT falls below 95% of 3.3 V (i.e., ≤3.135 V) - provides reliable power-good signaling for microcontroller reset sequencing. |
Pinout & Package
LM2590HVSX-3.3/NOPB uses the KTW (TO-263-7) surface-mount package: 10.10 mm × 8.89 mm body, exposed thermal pad, 7-pin single-row configuration with Pin 1 (VIN) at top-left when tab faces up and leads point downward.
| 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 peak switching currents and suppress rail collapse. |
| 2 - Output | Internal power switch drain | Drives external catch diode and inductor; swings between ~VIN–0.95 V (ON) and ~–0.5 V (OFF); connects directly to Feedback for fixed 3.3-V operation. |
| 3 - Flag | Open-collector error indicator | Sinks ≤3 mA when VOUT < 3.135 V; requires external pull-up (e.g., 4.7 kΩ to 3.3 V or 22 kΩ if pulled to ≥45 V) to signal "power good" after delay. |
| 4 - Gnd | Circuit ground reference | Common return for internal bias, feedback, and power switch; must be low-impedance connection to minimize noise coupling into sensitive analog blocks. |
| 5 - Delay | Flag assertion timing control | Charged by 3 µA internal current source; flag goes high when capacitor voltage exceeds 1.25 V - sets power-up delay tDELAY ≈ 0.417 × CDELAY (seconds). |
| 6 - Feedback | Regulation setpoint input | Internally tied to Output for 3.3-V version; senses 1.23 V reference - no external resistors needed, eliminating calibration drift and layout sensitivity. |
| 7 - SD/SS | Shutdown and soft-start control | ≤0.6 V = shutdown (90 µA IQ); ≥2 V = active; 0–2.8 V ramp = soft-start - capacitor here controls output voltage slew rate during turn-on. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated error flag with programmable delay | Enables precise power sequencing in multi-rail systems by decoupling fault detection from startup timing - avoids false resets during output settling. |
| 150-kHz fixed-frequency operation | Reduces size of magnetic components and output filter capacitors versus 50–100 kHz competitors - supports compact PCB layouts in DIN-rail or motor-drive enclosures. |
| Thermal shutdown and two-stage current limit | Prevents catastrophic failure during overload or short-circuit: first stage limits peak switch current to ~1.9 A; second stage reduces frequency to limit average power dissipation. |
| Low 90-µA shutdown current | Extends battery life in portable instrumentation or remote sensors - allows host MCU to disable power stage while retaining real-time clock or wake-on-event capability. |
| Wide 4.5–60 V input range | Eliminates need for pre-regulator in automotive (12 V/24 V), industrial (24 V/48 V), and solar (up to 60 V MPPT) applications - simplifies BOM and improves system efficiency. |
Applications
| Industrial PLC I/O Module Power | Automotive Body Control Unit (BCU) |
|---|---|
Use Scenario: Providing isolated 3.3-V logic supply for digital I/O expansion cards in programmable logic controllers operating from 24 V DC field bus. IC Role / Device Role / Timing Role: Primary buck regulator converting 24 V to 3.3 V for FPGA configuration, ADC interface, and CAN transceiver bias - operates continuously with 100% duty cycle capability at light loads. Use Value: ±4% output tolerance ensures reliable operation of 3.3-V microcontrollers and serial peripherals across ambient temperatures from –40°C to +70°C without derating. | Use Scenario: Generating 3.3-V supply for infotainment display controller and sensor fusion MCU in 12 V automotive electrical architecture with cold-crank (6.5 V) and load-dump (40 V) transients. IC Role / Device Role / Timing Role: Input-tolerant step-down converter with built-in undervoltage lockout - remains disabled below 4.5 V and withstands 60 V transients without external protection. Use Value: 60 V absolute max input rating and thermal shutdown allow direct connection to vehicle battery, reducing bill-of-materials versus cascaded 12 V → 5 V → 3.3 V solutions. |
| Outdoor Wireless Sensor Node | Medical Patient Monitor Auxiliary Rail |
Use Scenario: Powering ultra-low-power ARM Cortex-M0+ MCU and LoRaWAN radio from a 36 V solar panel + LiFePO₄ battery stack in remote environmental monitoring station. IC Role / Device Role / Timing Role: High-efficiency primary regulator delivering 1 A peak during radio transmission bursts - leverages 77% efficiency at 12 V IN → 3.3 V OUT to maximize energy harvest. Use Value: 90 µA shutdown current enables >5-year battery life in sleep mode; Flag output triggers MCU wake-up on undervoltage condition before brownout. | Use Scenario: Generating clean 3.3-V supply for ECG front-end ASIC and touch-screen controller in Class II medical device powered from isolated 24 V DC adapter. IC Role / Device Role / Timing Role: Safety-critical auxiliary rail generator with out-of-regulation detection - Flag signal halts data acquisition and asserts hardware alarm if output deviates >5%. Use Value: Programmable Delay pin allows synchronization of power-good assertion with ADC reference stabilization time, preventing invalid measurements during startup. |
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 (14.99 mm × 10.16 mm); higher RθJA (50°C/W vs. 20°C/W for KTW with 3 in² copper); identical electrical specs. | Requires heatsink for >500 mA continuous loads in enclosed environments; less suitable for high-density SMT assembly. | Select LM2590T-3.3 only when through-hole mounting or legacy board compatibility is required. |
| LM2596SX-3.3 | Lower max input (40 V vs. 60 V); 150 kHz same; 3.3-V version has ±4% tolerance; 1 A rated but lower SOA due to smaller TO-263-5 package. | Not suitable for 48 V industrial or automotive applications; limited thermal headroom above 70°C ambient. | Choose LM2596SX-3.3 only for cost-sensitive 12–24 V applications where 60 V rating is unnecessary. |
Compared with LM2590T-3.3, LM2590HVSX-3.3/NOPB offers superior thermal performance in SMT layouts; compared with LM2596SX-3.3, it provides 20 V higher input tolerance and wider safe operating area - critical for reliability in harsh environments.
Availability
LM2590HVSX-3.3/NOPB is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, outdoor wireless sensor nodes, and medical patient monitors requiring stable component supply with long-term manufacturability.
Supply support for LM2590HVSX-3.3/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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and silicon technology for industrial, automotive, and personal electronics markets.
The LM2590HV product line was designed for rugged, high-input-voltage DC-DC conversion in industrial automation, transportation, and energy infrastructure - emphasizing wide VIN range, integrated protection, and minimal external component count.
FAQ
What is the maximum input voltage rating for LM2590HVSX-3.3/NOPB?
The LM2590HVSX-3.3/NOPB has an absolute maximum input voltage rating of 63 V, with recommended operating range from 4.5 V to 60 V. This 60 V upper limit enables direct connection to 48 V industrial buses and automotive systems with load-dump transients, eliminating need for external clamping circuits in most applications. Exceeding 63 V risks permanent damage per Absolute Maximum Ratings table.
Does LM2590HVSX-3.3/NOPB require external feedback resistors to set the 3.3-V output?
No, LM2590HVSX-3.3/NOPB does not require external feedback resistors. The 3.3-V version internally connects Pin 2 (Output) directly to Pin 6 (Feedback), referencing the 1.23-V internal bandgap to produce a fixed 3.3-V output. This eliminates resistor tolerance errors, temperature drift, and PCB layout sensitivity - unlike adjustable versions that require precision R1/R2 dividers.
How is the error flag timing controlled on LM2590HVSX-3.3/NOPB?
The error flag timing on LM2590HVSX-3.3/NOPB is controlled by an external capacitor on Pin 5 (Delay). An internal 3 µA current source charges this capacitor; when its voltage reaches 1.25 V, Pin 3 (Flag) transitions high (after external pull-up). Delay time is calculated as tDELAY ≈ 0.417 × CDELAY (seconds), e.g., 100 nF yields ~42 µs delay. This allows synchronization of "power good" assertion with downstream circuit stabilization.
What thermal performance can be expected from LM2590HVSX-3.3/NOPB in a standard PCB layout?
In a standard layout with the TO-263-7 (KTW) package's thermal pad soldered to 3 in² of 1 oz. copper on the component side and 16 in² on the opposite side, LM2590HVSX-3.3/NOPB achieves RθJA = 20°C/W. At 1 A load with 12 V input, power dissipation is ~0.95 W, resulting in ~19°C junction-to-ambient rise - well within the 125°C max TJ limit even at 70°C ambient. No external heatsink is required under these conditions.
Can LM2590HVSX-3.3/NOPB be used in shutdown mode with zero load current?
Yes, LM2590HVSX-3.3/NOPB draws only 90 µA typical quiescent current in shutdown mode (Pin 7 ≤ 0.6 V) regardless of output load. This ultra-low standby current makes it suitable for battery-powered applications requiring years of shelf life, such as remote sensors or security devices. The output capacitor retains charge, and the device resumes regulation within microseconds upon exit from shutdown.
LM2590HVSX-3.3/NOPB 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:
- Active
- 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/NOPB FAQ
1.How can I place an order for LM2590HVSX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2590HVSX-3.3/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 LM2590HVSX-3.3/NOPB reliable?
The price and inventory of LM2590HVSX-3.3/NOPB 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/NOPB is usually 5 days.
3.What payment methods are accepted for LM2590HVSX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2590HVSX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2590HVSX-3.3/NOPB?
LM2590HVSX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2590HVSX-3.3/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 LM2590HVSX-3.3/NOPB?
For technical support, including LM2590HVSX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2590HVSX-3.3/NOPB requirements.
6.How does Aetrix verify that LM2590HVSX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2590HVSX-3.3/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 LM2590HVSX-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2590HVSX-3.3/NOPB?
All LM2590HVSX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2590HVSX-3.3/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 LM2590HVSX-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2590HVSX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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