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Texas Instruments LM2591HVSX-3.3
- Part No.:
- LM2591HVSX-3.3
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2591HVSX-3.3.pdf
- Description:
- IC REG BUCK 3.3V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:3,977
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Product details
Overview
LM2591HVSX-3.3 from Texas Instruments is a monolithic nonsynchronous step-down (buck) DC-DC switching regulator delivering 3.3 V at up to 1 A output current, with input voltage support up to 60 V, fixed 150-kHz switching frequency, and ±4% output voltage tolerance over line and load. It serves as a primary power conversion stage in industrial power supplies and automotive subsystems requiring high-input-voltage regulation.
For engineers reviewing the LM2591HVSX-3.3 datasheet, LM2591HVSX-3.3 pinout, LM2591HVSX-3.3 application, or LM2591HVSX-3.3 equivalent, key selection criteria include its 60-V max input rating, 1-A continuous load capability, ON/OFF control interface, thermal shutdown protection, and compatibility with standard 5-pin DDPAK/TO-263 surface-mount layouts.
Technical Context
The LM2591HVSX-3.3 integrates a PWM controller, power switch, and internal compensation to implement a fixed-frequency buck topology operating at 150 kHz (±15%). Its feedback loop references a stable 1.23-V internal bandgap, with the output directly tied to the FB pin in fixed-3.3-V configuration-eliminating external resistor dividers.
It features two-stage current limiting (peak limit: 1.3–2.8 A), thermal shutdown at 150°C junction temperature, and an ON/OFF pin enabling logic-controlled shutdown with 90-μA standby current. The device operates across –40°C to +125°C ambient and supports both continuous and discontinuous conduction modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% (3.168–3.432 V) over full line/load/temperature range - ensures stable logic rail generation without trimming. |
| Max Input Voltage | 60 V - enables direct regulation from unregulated 48-V industrial buses or automotive battery transients. |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and communication ICs in embedded systems. |
| Switching Frequency | 150 kHz (127–173 kHz) - allows use of compact, low-cost 47–100 μH inductors and aluminum electrolytic output capacitors. |
| Efficiency | 77% at VIN = 12 V, IOUT = 1 A - reduces thermal load in sealed enclosures and extends battery runtime in portable equipment. |
| Standby Current | 90 μA typical - enables low-power sleep modes in always-on monitoring systems without significant quiescent drain. |
| Thermal Shutdown | 150°C junction - protects against sustained overload or poor heatsinking in high-ambient environments. |
Pinout & Package
LM2591HVSX-3.3 is supplied in a 5-pin DDPAK/TO-263 surface-mount package (10.18 mm × 8.41 mm body), featuring exposed thermal pad for enhanced heat dissipation in high-power applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: +VIN | Input supply connection | Accepts 4.5–60 V DC; requires local 470-μF low-ESR input capacitor to handle high di/dt switching currents. |
| 2: Output | Switch node | Drives external catch diode and inductor; swings between ~(+VIN − 1.2 V) and ~−0.5 V during operation. |
| 3: Ground | Power and signal reference | Must be connected to low-impedance PCB ground plane; ties to exposed thermal pad for thermal performance. |
| 4: Feedback | Regulation sense input | Internally tied to 3.3-V output; no external divider needed - simplifies layout and improves stability. |
| 5: ON/OFF | Shutdown control | Logic-high ≥2 V disables regulator (90-μA IQ); floating or ≤0.6 V enables operation - supports system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input voltage range (4.5–60 V) | Supports direct integration into 24-V/48-V industrial, telecom, and automotive power architectures without pre-regulation. |
| Integrated thermal shutdown & current limiting | Eliminates need for external fault protection circuitry; enables robust operation under short-circuit or overtemperature conditions. |
| ON/OFF pin with 90-μA standby current | Enables precise system-level power gating and ultra-low-power sleep states in battery-backed or energy-harvesting designs. |
| Fixed-frequency 150-kHz oscillator | Ensures predictable EMI profile and simplifies filter design versus variable-frequency alternatives. |
| Internal frequency compensation | Reduces external component count to only inductor, catch diode, and input/output capacitors - accelerates design cycle. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Regulating 48-V vehicle battery down to 3.3 V for MCU and CAN transceiver rails in door modules or lighting controllers. IC Role / Device Role / Timing Role: Primary non-isolated buck converter providing stable 3.3-V logic supply with transient immunity to load-dump events. Use Value: Withstands 60-V input surges and delivers 1-A continuous current, eliminating need for upstream pre-regulators in cost-sensitive modules. |
Use Scenario: Generating 3.3-V supply for microcontroller-based HVAC actuators exposed to wide ambient temperature ranges (–40°C to +125°C). IC Role / Device Role / Timing Role: High-reliability DC-DC regulator operating across full automotive temperature range with built-in thermal shutdown. Use Value: ±4% output tolerance and 150-kHz fixed switching ensure consistent timing margin for digital peripherals without post-regulation LDOs. |
| Programmable Logic Controller (PLC) I/O Module | Outdoor Wireless Sensor Node |
|
Use Scenario: Converting 24-V field bus to 3.3-V for isolated digital I/O drivers and analog front-end ADCs in industrial automation cabinets. IC Role / Device Role / Timing Role: High-efficiency buck regulator supplying clean, regulated power to noise-sensitive mixed-signal circuits. Use Value: 77% efficiency at 12-V input minimizes self-heating in densely packed PLC backplanes, preserving long-term reliability. |
Use Scenario: Powering LoRaWAN or NB-IoT transceivers and environmental sensors from 3.6-V LiSOCl₂ primary cells boosted to 12 V, then stepped down to 3.3 V. IC Role / Device Role / Timing Role: Low-quiescent-current buck regulator enabling multi-year battery life via ON/OFF pin control during deep sleep cycles. Use Value: 90-μA standby current and logic-controlled shutdown reduce average system power to sub-μA levels between transmissions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2591SX-3.3 | Lower 40-V max input rating; identical 3.3-V output, 1-A rating, and pinout. | Not suitable for >40-V input systems (e.g., 48-V industrial buses or automotive load dump). | Select LM2591HVSX-3.3 when input may exceed 40 V; otherwise LM2591SX-3.3 offers cost advantage. |
| LM2678-3.3 | Higher 63-V absolute max input, 2.5-A output, and 260-kHz switching frequency; requires external compensation. | Supports higher current loads and faster transient response but increases BOM count and layout complexity. | Choose LM2678-3.3 only when >1-A output or tighter transient response is required; LM2591HVSX-3.3 provides simpler, lower-cost solution for 1-A needs. |
Compared with LM2591SX-3.3, LM2591HVSX-3.3 adds 20-V headroom for high-input-voltage resilience; compared with LM2678-3.3, it trades higher current and speed for reduced external component count and lower system cost at 1-A load points.
Availability
LM2591HVSX-3.3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and programmable logic controller (PLC) modules requiring stable component supply with extended temperature support and high-input-voltage tolerance.
Supply support for LM2591HVSX-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 specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and communications markets.
The LM2591HV product line delivers rugged, easy-to-use buck regulators targeting high-input-voltage applications where simplicity, reliability, and thermal robustness are critical - especially in harsh-environment power conversion.
FAQ
What is the maximum input voltage supported by the LM2591HVSX-3.3?
The LM2591HVSX-3.3 supports a maximum input voltage of 60 V, with absolute maximum rating of 63 V. This enables direct regulation from 48-V industrial buses or automotive systems experiencing load-dump transients. Operation above 40 V requires a Schottky diode from the Feedback pin to Ground to prevent negative voltage spikes during output short-circuit events, as specified in TI's SNVS074E datasheet.
Does the LM2591HVSX-3.3 require external feedback resistors?
No, the LM2591HVSX-3.3 does not require external feedback resistors. As a fixed-output version, its Feedback (FB) pin is internally connected to the 3.3-V output, eliminating the need for an external resistor divider. This simplifies PCB layout, improves regulation accuracy, and enhances long-term stability by removing resistor tolerance and drift variables from the feedback path.
How does the ON/OFF pin function on the LM2591HVSX-3.3?
The ON/OFF pin on the LM2591HVSX-3.3 enables logic-level control of regulator operation: driving the pin to ≥2 V places the device in shutdown mode with 90-μA typical quiescent current, while leaving it floating or pulling it to ≤0.6 V enables normal switching. The threshold voltage is typically 1.3 V, and the pin must not exceed 25 V - making it compatible with standard 3.3-V or 5-V GPIO signals.
What package type is used for the LM2591HVSX-3.3?
The LM2591HVSX-3.3 uses the 5-pin DDPAK/TO-263 surface-mount package (KTT variant), with nominal body dimensions of 10.18 mm × 8.41 mm and an exposed thermal pad. This package provides superior thermal performance versus TO-220, supporting higher power dissipation in compact layouts - critical for 1-A operation in enclosed industrial enclosures.
Is the LM2591HVSX-3.3 RoHS-compliant and lead-free?
Yes, the LM2591HVSX-3.3 is RoHS-compliant and lead-free per Texas Instruments' packaging standards. It meets JEDEC J-STD-020 moisture sensitivity level (MSL) 3 requirements and is qualified for reflow soldering per IPC/JEDEC J-STD-020. Full compliance documentation, including material declarations and test reports, is available through TI's official product folder for LM2591HVSX-3.3.
LM2591HVSX-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- 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-5)
LM2591HVSX-3.3 FAQ
1.How can I place an order for LM2591HVSX-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2591HVSX-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 LM2591HVSX-3.3 reliable?
The price and inventory of LM2591HVSX-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 LM2591HVSX-3.3 is usually 5 days.
3.What payment methods are accepted for LM2591HVSX-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2591HVSX-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2591HVSX-3.3?
LM2591HVSX-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2591HVSX-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 LM2591HVSX-3.3?
For technical support, including LM2591HVSX-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2591HVSX-3.3 requirements.
6.How does Aetrix verify that LM2591HVSX-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2591HVSX-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 LM2591HVSX-3.3 meets industry standards.
7.What is the process for return or replacement of LM2591HVSX-3.3?
All LM2591HVSX-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2591HVSX-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 LM2591HVSX-3.3 part is unused and in its original packaging.
Return procedure for LM2591HVSX-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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