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Texas Instruments LM2591HVS-3.3
- Part No.:
- LM2591HVS-3.3
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2591HVS-3.3.pdf
- Description:
- IC REG BUCK 3.3V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,233
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Product details
Overview
LM2591HVS-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 range of 4.5 V 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, battery-powered instrumentation, and automotive subsystems requiring robust wide-input regulation.
For engineers reviewing the LM2591HVS-3.3 datasheet, LM2591HVS-3.3 pinout, LM2591HVS-3.3 application, or LM2591HVS-3.3 equivalent, key selection criteria include its 60-V max input rating, 90-μA standby quiescent current, thermal shutdown protection, ON/OFF control interface, and compatibility with standard 5-pin TO-220 or DDPAK packages for high-power density layouts.
Technical Context
The LM2591HVS-3.3 integrates a PWM controller, power switch, and internal compensation to implement a fixed-frequency buck topology without external timing components. Its 150-kHz oscillator enables use of compact magnetics and capacitors while maintaining stable operation across −40°C to +125°C junction temperature.
It features a dedicated ON/OFF pin enabling logic-level shutdown (≤0.6 V = active, ≥2 V = standby), feedback pin referenced to 1.23 V internally for fixed 3.3-V output, and built-in two-stage current limiting plus thermal shutdown for fault resilience under overload or ambient stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over full line/load/temperature range - ensures stable digital rail compliance without external resistor network. |
| Max Input Voltage | 60 V - supports direct connection to 48-V industrial buses, automotive cold-crank transients, and unregulated solar/battery inputs. |
| Output Current | 1 A DC continuous - sufficient for powering microcontrollers, sensors, and communication ICs without external current boosting. |
| Switching Frequency | 150 kHz (±15%) - balances efficiency and EMI while allowing use of low-cost, off-the-shelf 47–100 μH shielded inductors. |
| Standby Quiescent Current | 90 μA typical - enables ultra-low-power sleep modes in battery-backed systems without compromising wake-up responsiveness. |
| Saturation Voltage | 1.2 V max at 1 A - defines conduction loss and minimum dropout; requires careful thermal design at high VIN/VOUT ratios. |
| Feedback Reference | Internally trimmed 1.23 V - eliminates external divider errors and drift, ensuring accuracy without calibration. |
Pinout & Package
LM2591HVS-3.3 is available in 5-pin TO-220 (NDH) and 5-pin DDPAK/TO-263 (KTT) packages. Both share identical pinout and functional assignment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VIN | Positive input supply | Accepts 4.5–60 V DC; requires local 470-μF low-ESR aluminum electrolytic bypass capacitor to handle high di/dt switching currents. |
| Output | Switch node | Drives external catch diode and inductor; swings between ~(+VIN − 1.2 V) and ~−0.5 V; layout critical for EMI and efficiency. |
| Ground | Power and signal reference | Common return for input/output capacitors, feedback network, and ON/OFF pull-down; must be low-impedance star point. |
| Feedback | Voltage sense input | Internally connected to 3.3-V output; not user-accessible in fixed version - no external resistors required. |
| ON/OFF | Shutdown control | Logic-compatible input: ≤0.6 V = enable, ≥2 V = disable; 90-μA standby draw when high; internal 1.3-V threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input voltage range | Supports 4.5–60 V operation - eliminates need for preregulation in 24-V/48-V industrial and transportation systems. |
| Integrated thermal shutdown | Automatically disables switching above 150°C junction temperature - prevents permanent damage during sustained overload or poor heatsinking. |
| Two-stage current limiting | Peak switch current limit of 1.3–2.8 A with foldback behavior - protects against short-circuit faults while sustaining partial load during transient overloads. |
| Low standby IQ | 90 μA typical shutdown current - extends battery life in portable equipment with intermittent operation requirements. |
| Fixed-frequency oscillator | 150-kHz internal clock - simplifies EMI filtering design and avoids variable-frequency noise spreading across spectrum. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Converting 24-V vehicle battery or 48-V telecom bus to clean 3.3-V logic rail for MCU and CAN transceivers. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing regulated 3.3-V supply with cold-crank immunity down to 4.5 V. Use Value: Eliminates need for external supervision circuitry due to integrated undervoltage lockout and thermal protection. |
Use Scenario: Powering microcontroller-based door lock, lighting, and window lift controllers in passenger vehicles. IC Role / Device Role / Timing Role: Main system regulator handling load dump transients up to 60 V and operating across −40°C to +125°C ambient. Use Value: Delivers 1-A output with <1.3-V saturation drop, minimizing heat generation in confined plastic enclosures. |
| Portable Test Instrumentation | Programmable Logic Controller I/O Module |
Use Scenario: Battery-powered handheld multimeter or sensor calibrator requiring long runtime and stable 3.3-V ADC reference. IC Role / Device Role / Timing Role: High-efficiency buck converter enabling >77% efficiency at 12-V input/1-A load, reducing thermal load on Li-ion packs. Use Value: 90-μA standby current allows multi-week shelf life in sleep mode without battery replacement. |
Use Scenario: Distributed I/O module converting 24-V field bus to isolated 3.3-V logic for FPGA configuration and serial interface ICs. IC Role / Device Role / Timing Role: Pre-regulator feeding isolated DC-DC converters, leveraging wide VIN range to tolerate field wiring voltage drops. Use Value: Fixed 3.3-V output eliminates trimming resistors and improves long-term stability versus adjustable alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596-3.3 | Lower max input voltage (40 V vs. 60 V); higher quiescent current (5 mA vs. 90 μA); same 1-A rating and 3.3-V fixed output. | Lacks cold-crank capability below 4.5 V and cannot support 48-V bus systems without external clamping. | Choose when cost sensitivity outweighs 48-V compatibility and ultra-low-IQ is unnecessary. |
| TPS54302DDCR | Synchronous buck; 6-V min input; 2.5-A output; 2.5-MHz switching; integrated high-side/low-side FETs; no external diode needed. | Requires smaller inductors/caps but demands tighter layout control; unsuitable for >40-V input or high-temperature ambient (>125°C). | Prefer for space-constrained designs needing >1-A output and higher efficiency at light loads, provided input stays <40 V. |
Compared with LM2596-3.3, LM2591HVS-3.3 delivers superior high-voltage resilience and standby efficiency; compared with TPS54302DDCR, it trades synchronous efficiency for ruggedness, simplicity, and extended input/temperature range - making it optimal for harsh-environment industrial and automotive front-end regulation.
Availability
LM2591HVS-3.3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and portable instrumentation requiring stable component supply, long-lifecycle availability, and proven reliability in high-temperature environments.
Supply support for LM2591HVS-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 technologies with over 90 years of innovation in industrial, automotive, and communications markets.
The LM2591HV series was designed as part of TI's SIMPLE SWITCHER® portfolio to deliver rugged, easy-to-use DC-DC conversion for engineers needing reliable, minimal-component buck regulation in demanding environments - prioritizing wide VIN, thermal robustness, and production-tested consistency over feature complexity.
FAQ
What is the maximum input voltage rating for the LM2591HVS-3.3?
The LM2591HVS-3.3 has an absolute maximum input voltage rating of 63 V, with recommended continuous operation up to 60 V. This allows direct integration into 48-V industrial systems and automotive applications experiencing load dump transients. Operation beyond 60 V risks permanent damage and voids warranty per TI's production data sheet SNVS074E.
Does the LM2591HVS-3.3 require external feedback resistors to set the output voltage?
No. The LM2591HVS-3.3 is a fixed-output variant with internal feedback divider trimmed to 3.3 V ±4%. The Feedback pin is internally connected to the output and is not accessible for external adjustment - eliminating resistor tolerance errors and simplifying layout versus adjustable versions like LM2591HV-ADJ.
How does the ON/OFF pin function on the LM2591HVS-3.3?
The ON/OFF pin enables logic-controlled shutdown: driving it to ≤0.6 V activates regulation, while ≥2 V places LM2591HVS-3.3 in standby mode drawing only 90 μA typical. The internal threshold is 1.3 V, and the pin must never exceed 25 V. No external pull-up is required - floating defaults to active mode.
What package options are available for the LM2591HVS-3.3?
The LM2591HVS-3.3 is offered in two thermally enhanced 5-pin packages: TO-220 (NDH, 14.986 mm × 10.16 mm) and DDPAK/TO-263 (KTT, 10.18 mm × 8.41 mm). Both share identical pinout and electrical specs; TO-220 suits through-hole prototyping and heatsink mounting, while DDPAK enables surface-mount assembly with lower thermal resistance to PCB copper.
Is the LM2591HVS-3.3 RoHS compliant and halogen-free?
Yes. Per TI's official packaging information in SNVS074E and TI.com product folder, LM2591HVS-3.3 is manufactured in RoHS-compliant, lead-free, and halogen-free packages meeting JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) for both NDH and KTT variants.
LM2591HVS-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:
- Tube
- 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)
LM2591HVS-3.3 FAQ
1.How can I place an order for LM2591HVS-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2591HVS-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 LM2591HVS-3.3 reliable?
The price and inventory of LM2591HVS-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 LM2591HVS-3.3 is usually 5 days.
3.What payment methods are accepted for LM2591HVS-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2591HVS-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2591HVS-3.3?
LM2591HVS-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2591HVS-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 LM2591HVS-3.3?
For technical support, including LM2591HVS-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2591HVS-3.3 requirements.
6.How does Aetrix verify that LM2591HVS-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2591HVS-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 LM2591HVS-3.3 meets industry standards.
7.What is the process for return or replacement of LM2591HVS-3.3?
All LM2591HVS-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2591HVS-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 LM2591HVS-3.3 part is unused and in its original packaging.
Return procedure for LM2591HVS-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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