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Texas Instruments LM2597HVM-12
- Part No.:
- LM2597HVM-12
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2597HVM-12.pdf
- Description:
- IC REG BUCK 12V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,048
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Product details
Overview
LM2597HVM-12 from Texas Instruments is a monolithic 150 kHz step-down (buck) switching voltage regulator IC delivering a fixed 12 V output at up to 0.5 A, with input voltage support up to 60 V, ±4% output voltage tolerance over line and load, and integrated soft-start/shutdown control. It serves as a primary DC-DC conversion stage in industrial power supplies requiring high-input-voltage resilience.
For engineers reviewing the LM2597HVM-12 datasheet, LM2597HVM-12 pinout, LM2597HVM-12 application, or LM2597HVM-12 equivalent, this page delivers verified specifications, package mapping, functional alternatives, and design-critical implementation context - including thermal resistance (150 °C/W for D-package), bias supply (VBS) efficiency optimization, and dropout detection flag behavior.
Technical Context
The LM2597HVM-12 integrates a 0.5 A N-channel DMOS switch, fixed-frequency 150 kHz oscillator, internal current-limit protection (0.58–1.4 A peak), and thermal shutdown. Its feedback loop uses a precision 1.23 V reference with <50 nA bias current, enabling stable regulation across −40°C to +125°C junction temperature.
It employs external components for buck topology operation: a catch diode, inductor (e.g., 100 μH for 24 VIN/12 VOUT), and input/output capacitors. The VBS pin supplies internal circuitry independently, improving efficiency at high input voltages by reducing quiescent current draw from VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% (11.52–12.60 V) under full line/load/temperature range - ensures stable rail for downstream logic or analog circuitry without external feedback resistors. |
| Input Voltage Range | 4.5 V to 60 V - supports wide-range industrial, automotive, or telecom inputs without pre-regulation. |
| Max Output Current | 0.5 A continuous - sufficient for powering microcontrollers, sensors, or interface ICs directly from unregulated sources. |
| Switching Frequency | 150 kHz (±15%) - enables use of compact, low-cost standard inductors while balancing EMI and efficiency. |
| Efficiency | 88% typical at VIN = 25 V, IOUT = 0.5 A - minimizes thermal stress and PCB copper area required for heat sinking. |
| Quiescent Current | 140 μA typical in shutdown - critical for battery-backed or always-on systems where standby power must be minimized. |
| Thermal Resistance (θJA) | 150 °C/W (D-package) - defines maximum power dissipation before thermal shutdown; requires ≥1 in² copper pour for full-rated operation. |
Pinout & Package
LM2597HVM-12 is packaged in an 8-pin SOIC (D-package, TI package code D0008A), with exposed pad for thermal enhancement. Pin functions are validated per TI SNVS119C Rev. April 2013, Figure 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Accepts 4.5–60 V DC; requires local 47–68 μF low-ESR input capacitor to suppress transients. |
| OUT | Switch Node | Drives external inductor; connects to cathode of catch diode and inductor's SW node - not a regulated output. |
| GND | Power Ground | Common return for switch, feedback, and bias circuits; must be low-impedance connection to minimize noise coupling. |
| FB | Feedback Input | Monitors regulated output via resistor divider (not used in fixed-12V version); internally tied to 12 V reference. |
| SD/SS | Shutdown/Soft-Start Control | Pull ≤0.6 V to shut down (ISTBY = 140 μA); apply 2–3 V ramp for controlled soft-start to limit inrush current. |
| FLAG | Regulation Status Flag | Open-drain output pulled low when VOUT drops below 92% nominal - signals fault to host controller or supervisory circuit. |
| DELAY | Flag Delay Control | Configures flag response time; 1.25 V threshold sets delay before FLAG asserts during undervoltage events. |
| VBS | Bias Supply Input | Provides dedicated 2–4.4 V supply for internal circuitry; reduces VIN loading and improves efficiency above 24 V input. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.5 A DMOS Switch | Eliminates need for external MOSFET and gate driver; simplifies layout and reduces BOM count in space-constrained designs. |
| 150 kHz Fixed-Frequency Oscillator | Enables predictable EMI filtering and compatibility with off-the-shelf inductors optimized for 150 kHz buck converters. |
| VBS Bias Supply Pin | Decouples internal logic supply from VIN, reducing no-load current and improving efficiency at high input voltages (>24 V). |
| Out-of-Regulation Flag with Programmable Delay | Provides reliable system-level fault signaling with adjustable response time - avoids false triggers during transient load steps. |
| Thermal Shutdown + Two-Stage Current Limit | Protects against sustained overload or short-circuit conditions without external sensing components or complex compensation. |
Applications
| Industrial Sensor Power Supply | Rail Conversion for Legacy Equipment |
|---|---|
|
Use Scenario: Powers 12 V analog sensors (e.g., pressure transducers, RTD interfaces) from 24–48 V factory bus rails. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, ripple-controlled 12 V rail with fault reporting via FLAG pin. Use Value: Delivers 88% efficiency at 25 V input, minimizing heat buildup in sealed enclosures; VBS pin maintains low IQ during extended idle periods. |
Use Scenario: Replaces aging linear regulators in legacy PLC I/O modules requiring stable 12 V from 36 V backplane. IC Role / Device Role / Timing Role: High-efficiency buck converter replacing dissipative 7812-based solutions; SD/SS pin enables firmware-controlled power sequencing. Use Value: Reduces thermal load by >70% vs. linear regulator; 150 kHz switching allows smaller filter components than 50 kHz alternatives. |
| Telecom Remote Radio Unit (RRU) | On-Board Pre-Regulator for FPGA Core Rails |
|
Use Scenario: Generates 12 V intermediate rail from −48 V telecom supply (using positive-to-negative converter topology). IC Role / Device Role / Timing Role: Buck regulator operating in inverted configuration; FLAG pin monitors regulation integrity under variable RF load. Use Value: Supports 60 V absolute max input rating - accommodates voltage spikes on telecom lines; thermal shutdown prevents field failures. |
Use Scenario: Supplies clean 12 V to LDOs feeding FPGA I/O banks, where efficiency and reliability outweigh ultra-low-noise requirements. IC Role / Device Role / Timing Role: High-current pre-regulator with soft-start to prevent inrush-induced brownouts during FPGA configuration. Use Value: 0.5 A output and 150 kHz frequency enable compact, cost-effective solution using standard surface-mount inductors and capacitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596HVM-12 | Higher 3 A output current, same 60 V input, but 150 kHz frequency and pinout differ; requires different inductor and PCB layout. | Used where higher load current or tighter load regulation is required; not drop-in compatible due to different pin assignment (e.g., FB and VOUT swapped). | Select LM2596HVM-12 only if 0.5 A is insufficient and board redesign is acceptable. |
| TPS54302DDAR | 2.5–28 V input, 3 A output, 500 kHz switching, integrated compensation; no FLAG or VBS pins; requires external soft-start capacitor. | Preferred for space-constrained designs needing higher efficiency at light loads; lacks regulation flag and bias supply features critical for industrial monitoring. | Choose TPS54302DDAR when footprint and light-load efficiency dominate; retain LM2597HVM-12 when FLAG signaling and high-VIN robustness are mandatory. |
Compared with LM2596HVM-12 and TPS54302DDAR, the LM2597HVM-12 uniquely balances high-input-voltage capability (60 V), integrated fault signaling (FLAG/DELAY), and bias supply optimization (VBS) - making it optimal for industrial systems where reliability under voltage transients and supervisory integration outweigh raw current or frequency advantages.
Availability
LM2597HVM-12 is available at Aetrix Electronics and suitable for industrial sensor power supplies, telecom remote radio units, and legacy equipment rail conversion requiring stable component supply, long-term lifecycle assurance, and traceable sourcing from authorized channels.
Supply support for LM2597HVM-12 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 high-reliability power conversion ICs.
The LM2597HVM-12 belongs to TI's SIMPLE SWITCHER® family - designed specifically for engineers seeking robust, easy-to-implement DC-DC solutions in industrial, automotive, and telecom applications where input voltage resilience and built-in protection are critical.
FAQ
What is the maximum input voltage rating for the LM2597HVM-12?
The LM2597HVM-12 supports an absolute maximum input voltage of 60 V, with recommended operating range from 4.5 V to 60 V. This HV rating distinguishes it from the standard LM2597 (40 V max) and enables direct use in 48 V industrial and telecom systems without pre-regulation stages. Exceeding 60 V risks permanent damage per Absolute Maximum Ratings table in SNVS119C.
Does the LM2597HVM-12 require external feedback resistors to set its output voltage?
No - the LM2597HVM-12 is a fixed-output variant with internal resistor divider configured for 12 V. The FB pin is internally connected and not accessible for adjustment; external resistors are unnecessary and would disrupt regulation. This simplifies design versus the adjustable LM2597HV-ADJ version, which requires R1/R2 to set VOUT.
How does the VBS pin improve efficiency in the LM2597HVM-12?
The VBS pin supplies internal circuitry (oscillator, comparator, logic) independently from VIN. At high input voltages (e.g., 48 V), routing bias current through VIN would increase quiescent loss. By applying 2–4.4 V to VBS - typically from a local LDO or resistor-divider - the LM2597HVM-12 reduces total operating current, improving efficiency by up to 5% at 36–60 V input compared to VBS-open operation.
What is the function of the DELAY pin on the LM2597HVM-12?
The DELAY pin sets the response time of the FLAG output during undervoltage events. Applying a voltage between 1.21 V and 1.29 V configures the delay before FLAG asserts low when VOUT falls below 92% of nominal. This prevents nuisance trips during brief load transients while ensuring timely fault detection - a key differentiator versus basic enable/disable regulators.
Can the LM2597HVM-12 be used in a positive-to-negative converter configuration?
Yes - the LM2597HVM-12 supports inverting buck-boost (positive-to-negative) topologies per TI Application Note SLVA001. In this mode, the OUT pin drives the inductor's switched node, GND becomes the negative output rail, and the original GND is referenced to the new negative rail. The 12 V fixed output becomes −12 V, retaining all protection features including FLAG and thermal shutdown.
LM2597HVM-12 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):
- 12V
- 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-12 FAQ
1.How can I place an order for LM2597HVM-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2597HVM-12 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-12 reliable?
The price and inventory of LM2597HVM-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2597HVM-12 is usually 5 days.
3.What payment methods are accepted for LM2597HVM-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2597HVM-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2597HVM-12?
LM2597HVM-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2597HVM-12 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-12?
For technical support, including LM2597HVM-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2597HVM-12 requirements.
6.How does Aetrix verify that LM2597HVM-12 is sourced from the original manufacturer or authorized distributors?
All LM2597HVM-12 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-12 meets industry standards.
7.What is the process for return or replacement of LM2597HVM-12?
All LM2597HVM-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2597HVM-12, 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-12 part is unused and in its original packaging.
Return procedure for LM2597HVM-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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