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Texas Instruments LM2597HVMX-ADJ/NOPB
- Part No.:
- LM2597HVMX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2597HVMX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,067
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Product details
Overview
LM2597HVMX-ADJ/NOPB from Texas Instruments is a monolithic nonsynchronous step-down DC-DC converter IC designed for high-input-voltage industrial and automotive power supplies. It delivers up to 0.5 A output current, supports 1.2 V to 37 V adjustable output voltage (±4% tolerance), operates at fixed 150 kHz switching frequency, and accepts input voltages up to 60 V - enabling efficient buck conversion in battery-powered or wide-range DC systems.
For engineers reviewing the LM2597HVMX-ADJ/NOPB datasheet, LM2597HVMX-ADJ/NOPB pinout, LM2597HVMX-ADJ/NOPB application, or LM2597HVMX-ADJ/NOPB equivalent, key selection criteria include its HV-rated input range, integrated soft-start/shutdown control, error flag with delay timing, bias supply (VBS) pin for efficiency optimization at high VIN/low VOUT, and thermal shutdown protection.
Technical Context
The LM2597HVMX-ADJ/NOPB implements a current-mode PWM controller with internal 150 kHz oscillator, fixed-frequency operation, and built-in two-stage current limiting. Its feedback loop uses a precision 1.23 V reference (VFB = 1.230 V typ) sensed at the FB pin to regulate output via external resistor divider.
It features dual-function Shutdown/Soft-Start (SD/SS) pin enabling logic-level disable (ISTBY = 140–250 μA typ) and controlled ramp-up via external capacitor, plus an open-collector Error_Flag output activated when VOUT drops below 95% of nominal, with programmable delay via external capacitor on the Delay pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 60 V - supports 24 V, 36 V, 48 V industrial rails and automotive cold-crank conditions. |
| Output Current | 0.5 A continuous - sufficient for powering microcontrollers, sensors, and analog circuitry without external pass devices. |
| Output Voltage Range | 1.2 V to 37 V adjustable - set by external R1/R2 divider; enables single BOM for multiple output requirements. |
| Feedback Reference | 1.230 V ±20 mV - high-precision reference ensures tight regulation across line/load/temperature (±4% total). |
| Switching Frequency | 150 kHz (110–173 kHz over temp) - enables use of low-cost, standard inductors and reduces EMI compared to lower-frequency alternatives. |
| Quiescent Current | 5–10 mA operating / 140–250 μA standby - minimizes no-load power loss in always-on systems. |
| Saturation Voltage | 0.9–1.2 V at 0.5 A - defines minimum dropout and impacts efficiency at low VOUT/high IOUT. |
Pinout & Package
LM2597HVMX-ADJ/NOPB is supplied in an 8-pin SOIC (D package), 4.90 mm × 3.91 mm body size, surface-mount package with standard JEDEC outline and thermal pad not included.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Error_Flag | Open-collector fault indicator | Asserts low when VOUT falls below 95% of target; used for MCU reset or system monitoring with external pull-up. |
| 2 - Delay | Capacitor-timed flag enable | External capacitor sets delay between VOUT reaching regulation and Error_Flag deassertion - prevents false resets during startup. |
| 3 - Bias_Supply (VBS) | Internal circuit power source | Connect to regulated output (≥4 V) to reduce VIN current draw and improve efficiency at high input/low output conditions. |
| 4 - Feedback (FB) | Voltage sense input | Monitors divided output voltage; internal 1.23 V reference compares against FB to adjust duty cycle for regulation. |
| 5 - Shutdown/Soft-Start (SD/SS) | Control input | Logic-low disables regulator (ISTBY ≈ 140 μA); capacitor adds soft-start ramp to limit inrush current. |
| 6 - Ground | Power and signal reference | Common return for internal circuits, switch node path, and feedback network - requires low-impedance PCB connection. |
| 7 - +VIN | Main power input | Accepts up to 60 V; requires local ceramic bypass capacitor to handle high di/dt switching currents. |
| 8 - Output | Internal NPN switch collector | Drives external catch diode and inductor; voltage swings between VIN−VSAT and ~−0.5 V - minimize copper area to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Bias Supply (VBS) Pin | Enables powering internal circuitry from regulated output instead of VIN - improves efficiency by >5% at VIN = 48 V / VOUT = 5 V. |
| Integrated Soft-Start | Reduces peak inrush current from ~700 mA to ~160 mA - eliminates need for external inrush limiters in space-constrained designs. |
| Error Flag with Programmable Delay | Provides reliable power-good signaling with user-defined hold-off time - avoids premature MCU release during marginal startup. |
| Thermal Shutdown & Current Limit | Two-stage current limit (0.58–1.4 A) plus junction temperature cutoff at 150°C - protects against sustained overload and PCB overheating. |
| High-Voltage Input Rating | 60 V absolute max input - supports 48 V telecom, industrial 24/36 V systems, and automotive load-dump survivability. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Converting 36 V battery or 48 V bus to 3.3 V or 5 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable, low-noise DC power with fault reporting to supervisory MCU. Use Value: 60 V input rating handles transients; ±4% output tolerance ensures reliable digital logic operation across temperature. | Use Scenario: Generating 5 V from vehicle battery (9–16 V nominal, up to 40 V during load dump) for BCM microcontroller and CAN transceivers. IC Role / Device Role / Timing Role: High-reliability buck converter with error flag used as hardware reset source during brownout recovery. Use Value: Soft-start prevents fuse blowing during cold-crank; thermal shutdown protects against under-hood overheating. |
| Programmable Logic Controller | Test Equipment Power Rail |
Use Scenario: Providing adjustable 12–24 V output from 48 V backplane to drive solenoids, relays, and analog outputs. IC Role / Device Role / Timing Role: Configurable voltage regulator supporting multiple field I/O standards via resistor-divider tuning. Use Value: 1.2–37 V adjustment range allows one design to serve multiple output configurations without redesign. | Use Scenario: On-board 15 V supply for op-amp biasing and ADC reference in portable bench instruments. IC Role / Device Role / Timing Role: Low-quiescent, high-efficiency buck stage minimizing self-heating in thermally isolated enclosures. Use Value: 140 μA standby current extends battery life; 150 kHz switching enables compact LC filter design. |
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/NOPB | Higher 3 A output current; same 60 V input, 150 kHz, adjustable output; larger SOIC-8 footprint (6.2 mm × 4.4 mm). | Used where higher load current is required; not drop-in due to different thermal pad layout and pinout. | Select when >0.5 A output is needed and board space allows larger package. |
| TPS54302DDAR | 3 A synchronous buck; 3.5–28 V input; 500 kHz switching; integrated high-side/low-side FETs; no external diode required. | Offers higher efficiency and smaller solution size but lacks error flag, delay, and bias supply features. | Choose for efficiency-critical, space-constrained designs where supervision features are handled externally. |
Compared with LM2596HV-ADJ/NOPB, LM2597HVMX-ADJ/NOPB provides identical HV capability in a smaller SOIC-8 package but lower current rating; versus TPS54302DDAR, it trades synchronous efficiency for robust supervision features and wider input range - making it preferable for fault-aware industrial systems.
Availability
LM2597HVMX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and programmable logic controller designs requiring stable component supply, long-term lifecycle support, and proven reliability in high-input-voltage applications.
Supply support for LM2597HVMX-ADJ/NOPB 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 over 50 years of innovation in power conversion ICs.
The LM2597HV product line was engineered for rugged, high-input-voltage DC-DC conversion in industrial automation, transportation, and energy infrastructure - emphasizing simplicity, fault resilience, and minimal external component count.
FAQ
What is the maximum input voltage rating for LM2597HVMX-ADJ/NOPB?
The LM2597HVMX-ADJ/NOPB has an absolute maximum input voltage of 60 V and a recommended operating range of 4.5 V to 60 V. This HV rating distinguishes it from the standard LM2597 (max 40 V) and enables use in 48 V systems, industrial buses, and automotive applications with load-dump transients. Exceeding 60 V risks permanent damage per Absolute Maximum Ratings.
How does the Bias Supply (VBS) pin improve efficiency in LM2597HVMX-ADJ/NOPB?
The VBS pin on LM2597HVMX-ADJ/NOPB allows internal circuitry to be powered from the regulated output instead of VIN. When VOUT ≥ 4 V, connecting VBS to VOUT reduces VIN current draw by ~4 mA and increases efficiency - especially beneficial at high input voltages (e.g., 48 V → 5 V), where efficiency gains exceed 5% as shown in TI's Figure 19 and Figure 20.
Can LM2597HVMX-ADJ/NOPB be used in an inverting (positive-to-negative) configuration?
Yes, LM2597HVMX-ADJ/NOPB supports inverting topology per TI's Figure 24. By bootstrapping the GND pin to the negative output and grounding the FB pin, it regulates inverted output (e.g., −5 V from +24 V). However, maximum |VIN| + |VOUT| must stay ≤ 60 V, and startup inrush current can reach 0.8 A - soft-start is strongly recommended to prevent input source collapse.
What is the purpose of the Delay pin on LM2597HVMX-ADJ/NOPB?
Pin 2 (Delay) on LM2597HVMX-ADJ/NOPB sets the time delay between VOUT reaching 95% of regulation and the Error_Flag output transitioning high. An external capacitor (e.g., 10 nF = ~10 ms delay) prevents premature system release during marginal power-up - critical for reliable MCU reset sequencing in industrial controllers.
Does LM2597HVMX-ADJ/NOPB include thermal protection?
Yes, LM2597HVMX-ADJ/NOPB integrates thermal shutdown that disables the output switch when junction temperature exceeds 150°C. Recovery occurs automatically after cooldown. Combined with internal current limiting (0.58–1.4 A peak), this dual protection prevents damage during sustained overload, poor heatsinking, or ambient temperature excursions - essential for unattended industrial deployments.
LM2597HVMX-ADJ/NOPB 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:
- Active
- 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/NOPB FAQ
1.How can I place an order for LM2597HVMX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2597HVMX-ADJ/NOPB 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/NOPB reliable?
The price and inventory of LM2597HVMX-ADJ/NOPB 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/NOPB is usually 5 days.
3.What payment methods are accepted for LM2597HVMX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2597HVMX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2597HVMX-ADJ/NOPB?
LM2597HVMX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2597HVMX-ADJ/NOPB 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/NOPB?
For technical support, including LM2597HVMX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2597HVMX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2597HVMX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2597HVMX-ADJ/NOPB 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/NOPB meets industry standards.
7.What is the process for return or replacement of LM2597HVMX-ADJ/NOPB?
All LM2597HVMX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2597HVMX-ADJ/NOPB, 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/NOPB part is unused and in its original packaging.
Return procedure for LM2597HVMX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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