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Texas Instruments LM2597HVM-3.3
- Part No.:
- LM2597HVM-3.3
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2597HVM-3.3.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,498
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Product details
Overview
LM2597HVM-3.3 from Texas Instruments is a monolithic 150 kHz step-down (buck) switching voltage regulator delivering a fixed 3.3 V output at up to 0.5 A, with ±4% output voltage tolerance over line and load, input voltage range up to 60 V, and integrated soft-start/shutdown control. It serves as a high-efficiency DC-DC power conversion stage in industrial power supplies and embedded systems requiring robust input voltage handling.
For engineers reviewing the LM2597HVM-3.3 datasheet, LM2597HVM-3.3 pinout, LM2597HVM-3.3 application, or LM2597HVM-3.3 equivalent, key selection criteria include its 60 V max input rating, 3.3 V fixed output accuracy, thermal shutdown protection, bias supply (VBS) pin for high-input-voltage efficiency optimization, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2597HVM-3.3 implements a current-mode controlled buck topology with an internal 150 kHz oscillator, enabling predictable ripple frequency and simplified EMI filtering. Its two-stage current limit and thermal shutdown provide fault protection without external circuitry.
It features a dedicated bias supply (VBS) pin that powers internal circuitry independently of VIN, reducing quiescent current and improving efficiency at high input voltages. The device also integrates an error flag with programmable delay and a shutdown/soft-start pin with defined threshold voltages (0.6 V low, 2 V high).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over full line/load/temperature range - ensures stable logic rail generation without external feedback resistors. |
| Max Input Voltage | 60 V - supports wide-input applications such as automotive battery-supplied systems or industrial 48 V bus derivatives. |
| Output Current | 0.5 A continuous - sufficient for powering microcontrollers, FPGAs, and peripheral ICs in compact embedded designs. |
| Switching Frequency | 150 kHz fixed - enables use of small, low-cost magnetic components and simplifies EMI compliance testing. |
| Efficiency | 80% at VIN = 12 V, IOUT = 0.5 A - reduces thermal load and eliminates need for heatsinking on typical PCB copper areas. |
| Standby Current | 140 μA typical - enables ultra-low-power sleep modes in battery-backed or energy-sensitive systems. |
| Thermal Shutdown | Active at TJ ≥ +150 °C - provides autonomous protection against sustained overload or poor layout conditions. |
Pinout & Package
LM2597HVM-3.3 is available in an 8-pin SOIC (D) package (Package Number D0008A), with exposed pad for enhanced thermal performance. Pin functions are validated per TI SNVS119C Rev. April 2013.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Accepts 4.5–60 V DC; requires local low-ESR input capacitor to suppress switching transients. |
| OUT | Switched output node | Drives external inductor; connects to catch diode anode and output capacitor positive terminal. |
| GND | Power and signal reference | Common return for internal switch, control circuitry, and external components; must be low-impedance plane. |
| FB | Feedback sense (not used) | Internally connected to 3.3 V reference; left unconnected in fixed-output versions. |
| SD/SS | Shutdown/Soft-start control | Pull ≤0.6 V to disable regulator (85 μA standby); apply >2 V to initiate controlled soft-start ramp. |
| FLAG | Error flag output | Open-drain active-low signal indicating output undervoltage; includes built-in delay to reject transient dips. |
| DELAY | Flag delay timing | Connects to external capacitor to set flag assertion delay time (threshold = 1.25 V). |
| VBS | Bias supply input | Provides dedicated low-noise supply for internal circuitry; improves efficiency and stability at high VIN. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated soft-start | Eliminates inrush current during power-up by controlling output voltage ramp rate via SD/SS pin voltage. |
| High-voltage input capability | 60 V absolute maximum rating enables direct operation from unregulated 48 V or automotive battery rails. |
| Dedicated VBS pin | Decouples internal bias from VIN, reducing operating current and maintaining regulation stability above 40 V input. |
| Out-of-regulation flag with delay | FLAG pin asserts only after sustained dropout (≥92% of nominal VOUT), rejecting brief line sags or load transients. |
| Two-stage current limiting | First stage limits peak switch current to ~0.65 A; second stage reduces switching frequency under overload to limit average power dissipation. |
Applications
| Industrial Power Conversion | Automotive Body Control Module |
|---|---|
Use Scenario: Converting 24 V or 48 V factory bus to clean 3.3 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated logic supply with high input voltage tolerance. Use Value: Eliminates need for pre-regulator stages; 60 V input rating avoids derating in fluctuating industrial environments. | Use Scenario: Generating 3.3 V for microcontroller and CAN transceiver in body control units exposed to load dump events. IC Role / Device Role / Timing Role: Robust DC-DC converter with thermal shutdown and current limiting for automotive-grade reliability. Use Value: Withstands 60 V transients without external clamping; FLAG output enables system-level fault logging. |
| Embedded System Pre-regulator | Point-of-Load Converter for FPGA Boards |
Use Scenario: Stepping down 12 V intermediate rail to 3.3 V before linear regulators for noise-sensitive analog subsystems. IC Role / Device Role / Timing Role: High-efficiency pre-regulator reducing heat generation ahead of LDOs. Use Value: 80% efficiency at 12 V → 3.3 V minimizes thermal stress on downstream LDOs and PCB traces. | Use Scenario: Providing 3.3 V core supply to FPGA configuration circuitry and I/O banks on compact carrier boards. IC Role / Device Role / Timing Role: Compact, fixed-output buck regulator with minimal external component count. Use Value: SOIC-8 footprint and standard inductor compatibility simplify layout and reduce BOM complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2597MX-3.3 | Standard-voltage version (max VIN = 40 V); identical pinout, same 3.3 V output and 0.5 A rating. | Suitable for 24 V or lower input systems; lacks HV-series robustness for 48 V+ or load-dump scenarios. | Select when input never exceeds 40 V and cost sensitivity outweighs margin for transient overvoltage. |
| LM2596HV-3.3 | Higher 3 A output current, same 60 V max input, but 150 kHz frequency and different pinout (no VBS or DELAY pins). | Supports higher-power loads but requires redesign of feedback network and layout due to non-pin-compatible package. | Choose when >0.5 A output is required and board space allows re-layout; not drop-in compatible. |
Compared with LM2597MX-3.3, the LM2597HVM-3.3 adds 20 V input headroom and VBS optimization for high-VIN efficiency; compared with LM2596HV-3.3, it trades current capacity for integrated flag/delay functionality and smaller solution size at 0.5 A.
Availability
LM2597HVM-3.3 is available at Aetrix Electronics and suitable for industrial power conversion, automotive body electronics, and embedded point-of-load applications requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM2597HVM-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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in switching regulator design and manufacturing.
The LM2597HVM series belongs to TI's SIMPLE SWITCHER® portfolio, engineered specifically for rugged, easy-to-implement DC-DC conversion in harsh environments where wide input range, thermal resilience, and minimal external components are critical.
FAQ
What is the maximum input voltage rating for the LM2597HVM-3.3?
The LM2597HVM-3.3 has an absolute maximum input voltage rating of 60 V, with recommended operating range from 4.5 V to 60 V. This high-voltage capability makes it suitable for automotive, industrial, and telecom applications where input rails may experience significant transients or wide variation. Operation above 40 V leverages the VBS pin to maintain efficiency and regulation stability.
Does the LM2597HVM-3.3 require external feedback resistors to set the output voltage?
No, the LM2597HVM-3.3 is a fixed-output variant with the 3.3 V regulation internally trimmed. The FB pin is not connected externally and must remain unconnected. This eliminates resistor tolerance errors and layout sensitivity associated with adjustable versions, ensuring consistent 3.3 V output across temperature and load conditions as specified in the datasheet.
How does the VBS pin improve performance in the LM2597HVM-3.3?
The VBS pin in the LM2597HVM-3.3 supplies dedicated bias power to internal control circuitry, decoupling it from the main VIN rail. This reduces operating quiescent current-especially critical at high input voltages-and improves regulation accuracy and transient response. When VIN exceeds ~25 V, connecting VBS to a locally regulated ~5 V source (or using the internal charge pump path) significantly enhances efficiency and thermal behavior.
What protection features are integrated into the LM2597HVM-3.3?
The LM2597HVM-3.3 integrates thermal shutdown, two-stage current limiting, and an out-of-regulation flag with programmable delay. Thermal shutdown activates at junction temperature ≥ +150 °C. Current limiting first clamps peak switch current (~0.65 A), then reduces switching frequency under sustained overload. The FLAG pin signals undervoltage only after a delay set by the DELAY pin capacitor, rejecting short-duration dips.
Can the LM2597HVM-3.3 be used in discontinuous conduction mode (DCM)?
Yes, the LM2597HVM-3.3 operates naturally in both continuous and discontinuous conduction modes depending on load, input voltage, and inductor value. At light loads (< ~100 mA), it transitions to DCM, reducing switching losses and improving light-load efficiency. The device's current-mode control architecture maintains stable regulation and predictable ripple characteristics across both modes without external mode-control circuitry.
LM2597HVM-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 500mA
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM2597HVM-3.3 FAQ
1.How can I place an order for LM2597HVM-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2597HVM-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 LM2597HVM-3.3 reliable?
The price and inventory of LM2597HVM-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 LM2597HVM-3.3 is usually 5 days.
3.What payment methods are accepted for LM2597HVM-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2597HVM-3.3 transactions.
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4.How is shipping managed for LM2597HVM-3.3?
LM2597HVM-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2597HVM-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 LM2597HVM-3.3?
For technical support, including LM2597HVM-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2597HVM-3.3 requirements.
6.How does Aetrix verify that LM2597HVM-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2597HVM-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 LM2597HVM-3.3 meets industry standards.
7.What is the process for return or replacement of LM2597HVM-3.3?
All LM2597HVM-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2597HVM-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 LM2597HVM-3.3 part is unused and in its original packaging.
Return procedure for LM2597HVM-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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