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Texas Instruments LM2597HVMX-ADJ
- Part No.:
- LM2597HVMX-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2597HVMX-ADJ.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,954
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Product details
Overview
LM2597HVMX-ADJ from Texas Instruments is a monolithic 150 kHz step-down (buck) switching regulator IC supporting adjustable output voltage from 1.2 V to 37 V (57 V for HV version), delivering up to 0.5 A with ±4% output voltage tolerance over line and load conditions, and operating from 4.5 V to 60 V input. It integrates internal frequency compensation, soft-start, shutdown control, and an error flag output - used in industrial power supplies requiring high-input-voltage DC/DC conversion.
For engineers reviewing the LM2597HVMX-ADJ datasheet, LM2597HVMX-ADJ pinout, LM2597HVMX-ADJ application, or LM2597HVMX-ADJ equivalent, key selection criteria include input voltage range (up to 60 V), adjustable output capability, 0.5 A output current rating, thermal shutdown protection, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2597HVMX-ADJ implements a fixed-frequency (150 kHz) current-mode buck topology with internal N-channel DMOS switch, feedback-controlled duty cycle, and two-stage current limiting. Its bias supply pin (VBS) improves efficiency at high input voltages by powering internal circuitry independently of VIN.
It features an out-of-regulation error flag with programmable delay via external capacitor, soft-start initiated by pulling the SD/SS pin above 2 V, and shutdown activation below 0.6 V on SD/SS - enabling precise sequencing and fault monitoring in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 60 V - supports wide-range industrial and automotive battery inputs without pre-regulation. |
| Output Voltage Range | 1.2 V to 37 V (adjustable via external resistor divider) - enables flexible rail generation across analog, digital, and mixed-signal subsystems. |
| Max Output Current | 0.5 A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Switching Frequency | 150 kHz (fixed) - allows use of compact, low-cost standard inductors and reduces EMI filtering complexity vs. lower-frequency alternatives. |
| Feedback Voltage | 1.230 V ±3.3% - sets output via resistive divider; low reference tolerance ensures tight regulation across temperature and load. |
| Quiescent Current | 140 μA typical in shutdown - minimizes standby power loss in always-on or battery-backed applications. |
| Efficiency | 80% at VIN = 12 V, VOUT = 3 V, IOUT = 0.5 A - delivers high conversion efficiency without external gate drivers or complex layout. |
Pinout & Package
LM2597HVMX-ADJ is housed in an 8-pin SOIC (D) package (Package Number D0008A), with exposed pad for thermal enhancement. Pin functions are validated per TI SNVS119C datasheet Figure 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Accepts 4.5–60 V DC; requires local ceramic bypass capacitor for transient suppression. |
| OUT | Switch Node | Drives external catch diode and inductor; high dv/dt node requiring short PCB traces. |
| GND | Power & Signal Ground | Common return for internal switch, feedback, and bias circuits; must be low-impedance plane. |
| FB | Feedback Input | Senses output via resistor divider; 1.23 V reference enables precise adjustable output programming. |
| SD/SS | Shutdown / Soft-start Control | Pull ≤0.6 V for shutdown (85–140 μA IQ); pull ≥2 V to initiate soft-start ramp. |
| FLAG | Error Flag Output | Open-drain active-low signal indicating output undervoltage; delay set by external capacitor. |
| DELAY | Flag Delay Timing | Connects to external capacitor to program error flag assertion delay (e.g., 10–100 ms). |
| VBS | Bias Supply Input | Provides dedicated supply for internal circuitry; improves efficiency and stability at high VIN. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.5 A DMOS Switch | Eliminates need for external MOSFET and driver, reducing BOM count and layout area. |
| Adjustable Output (1.2–37 V) | Enables single part number to support multiple output rails via resistor selection - simplifies inventory and design reuse. |
| 150 kHz Fixed-Frequency Operation | Permits use of low-cost, widely available off-the-shelf inductors (e.g., 33–100 μH) without custom magnetics. |
| VBS Bias Supply Pin | Decouples internal logic supply from high VIN, maintaining stable operation and efficiency up to 60 V input. |
| Thermal Shutdown + Current Limit | Two-stage current limit and junction temperature cutoff prevent damage during overload or short-circuit faults. |
Applications
| Industrial Power Conversion | Automotive Subsystem Supply |
|---|---|
Use Scenario: Converting 24 V truck battery to 5 V for CAN transceivers and microcontrollers in body control modules. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, regulated 5 V rail with fault reporting via FLAG pin. Use Value: Operates reliably across −40°C to +125°C ambient and handles load transients up to 0.5 A without external compensation. | Use Scenario: Generating 3.3 V from 12 V vehicle battery for infotainment SoC I/O supply and sensor interfaces. IC Role / Device Role / Timing Role: Adjustable buck converter configured for 3.3 V output using precision resistor divider on FB pin. Use Value: Achieves 82% efficiency at 12 V → 3.3 V/0.5 A while maintaining ±4% output accuracy over line/load/temperature. |
| Programmable Lab Power Supply | Legacy Equipment Retrofit |
Use Scenario: Building benchtop DC/DC module with user-adjustable output (1.2–24 V) via potentiometer-based feedback network. IC Role / Device Role / Timing Role: Core voltage regulation engine with soft-start (SD/SS) and overvoltage lockout (FLAG + DELAY). Use Value: Supports smooth output ramp-up and configurable fault delay - critical for protecting connected DUTs during power-up. | Use Scenario: Replacing aging linear regulators in telecom shelf power distribution where input is 48 V nominal. IC Role / Device Role / Timing Role: High-efficiency buck converter stepping 48 V down to 12 V for fan and interface circuitry. Use Value: Delivers 0.5 A at >85% efficiency with no heatsink required - reduces thermal stress and board space vs. linear solution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596HV-ADJ | Higher 3 A output current, 150 kHz frequency, but larger SOIC-8 footprint and higher quiescent current (5 mA typical). | Targets higher-power loads; less suitable for space-constrained 0.5 A designs. | Select LM2596HV-ADJ only when >0.5 A output or higher peak current capability is required. |
| TPS54302DDCR | 3 A synchronous buck, 2.5–28 V input, 1.5–15 V adjustable output, 2.5 MHz switching, integrated FETs, 28 μA IQ. | Requires smaller magnetics and offers better light-load efficiency; lacks FLAG/DELAY pins for fault reporting. | Choose TPS54302DDCR for compact, high-frequency designs where fault flag functionality is not mandatory. |
Compared with LM2597HVMX-ADJ, LM2596HV-ADJ provides higher current but increases board area and idle power, while TPS54302DDCR enables miniaturization and ultra-low IQ but sacrifices diagnostic signaling - making LM2597HVMX-ADJ optimal for cost-sensitive, fault-aware 0.5 A industrial supplies.
Availability
LM2597HVMX-ADJ is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and test equipment requiring stable component supply with long-term lifecycle assurance.
Supply support for LM2597HVMX-ADJ 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.
The LM2597HVMX-ADJ belongs to TI's SIMPLE SWITCHER® family - designed specifically for robust, easy-to-implement DC/DC conversion in harsh environments with minimal external components.
FAQ
What is the maximum input voltage supported by the LM2597HVMX-ADJ?
The LM2597HVMX-ADJ supports a maximum input voltage of 60 V, as specified in its Absolute Maximum Ratings and Operating Conditions. This high input rating makes it suitable for applications powered from 48 V industrial buses or automotive systems with load-dump transients. The standard LM2597 variant is limited to 40 V, confirming the "HV" suffix denotes the extended voltage capability unique to LM2597HVMX-ADJ.
How is the output voltage adjusted on the LM2597HVMX-ADJ?
The LM2597HVMX-ADJ uses a resistor divider network connected between VOUT, FB, and GND to set the output voltage based on its internal 1.230 V feedback reference. The formula is VOUT = 1.23 × (1 + R1/R2), where R1 connects from VOUT to FB and R2 connects from FB to GND. Precision 1% metal-film resistors are recommended to maintain the ±4% output tolerance across temperature and load conditions in LM2597HVMX-ADJ designs.
Does the LM2597HVMX-ADJ include thermal protection?
Yes, the LM2597HVMX-ADJ includes thermal shutdown protection that disables the internal switch when junction temperature exceeds +150°C. Recovery occurs automatically once the die cools below the hysteresis threshold. This feature is documented in the Absolute Maximum Ratings and Electrical Characteristics sections of the TI SNVS119C datasheet and operates independently of external components - ensuring reliable fault handling in LM2597HVMX-ADJ-based power supplies.
What is the purpose of the VBS pin on the LM2597HVMX-ADJ?
The VBS (Bias Supply) pin on the LM2597HVMX-ADJ provides a dedicated internal power rail for control circuitry, decoupling it from the main VIN supply. This improves efficiency and regulation stability - especially at high input voltages - by preventing internal logic voltage droop. TI specifies VBS must be connected to VIN through a 0.1 μF ceramic capacitor, and its current draw ranges from 120 μA to 4 mA depending on operating conditions in LM2597HVMX-ADJ applications.
Can the LM2597HVMX-ADJ be synchronized to an external clock?
No, the LM2597HVMX-ADJ does not support external clock synchronization. Its 150 kHz oscillator is fixed-frequency and internally generated, with no SYNC or CLKIN pin provided. Frequency variation is limited to ±15% over temperature and supply, as stated in the Electrical Characteristics table. For designs requiring synchronization, alternative regulators such as the TPS54302DDCR or LM5116 must be considered - LM2597HVMX-ADJ is optimized for simplicity, not timing coordination.
LM2597HVMX-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 57V
- 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
LM2597HVMX-ADJ FAQ
1.How can I place an order for LM2597HVMX-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2597HVMX-ADJ 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 LM2597HVMX-ADJ reliable?
The price and inventory of LM2597HVMX-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2597HVMX-ADJ is usually 5 days.
3.What payment methods are accepted for LM2597HVMX-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2597HVMX-ADJ transactions.
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4.How is shipping managed for LM2597HVMX-ADJ?
LM2597HVMX-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2597HVMX-ADJ 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 LM2597HVMX-ADJ?
For technical support, including LM2597HVMX-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2597HVMX-ADJ requirements.
6.How does Aetrix verify that LM2597HVMX-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2597HVMX-ADJ 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 LM2597HVMX-ADJ meets industry standards.
7.What is the process for return or replacement of LM2597HVMX-ADJ?
All LM2597HVMX-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2597HVMX-ADJ, 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 LM2597HVMX-ADJ part is unused and in its original packaging.
Return procedure for LM2597HVMX-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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