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Texas Instruments LM2597HVN-ADJ/NOPB
- Part No.:
- LM2597HVN-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2597HVN-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,751
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Product details
Overview
LM2597HVN-ADJ/NOPB from Texas Instruments is a monolithic nonsynchronous step-down (buck) DC-DC converter IC delivering 0.5-A output current with adjustable output voltage (1.2 V to 37 V), 150-kHz fixed-frequency switching, and input voltage support up to 60 V. It integrates internal frequency compensation, soft-start, shutdown control, and an error flag output - used in industrial power supplies, distributed power architectures, and embedded systems requiring compact, high-efficiency regulation.
For engineers reviewing the LM2597HVN-ADJ/NOPB datasheet, LM2597HVN-ADJ/NOPB pinout, LM2597HVN-ADJ/NOPB application, or LM2597HVN-ADJ/NOPB equivalent, key selection criteria include its HV-rated 60-V input capability, ±4% output voltage tolerance over line/load/temperature, bias supply (VBS) pin for efficiency optimization at high VIN/low VOUT, and thermal shutdown with current-limit protection.
Technical Context
The LM2597HVN-ADJ/NOPB implements a current-mode control architecture with a fixed 150-kHz oscillator, enabling stable operation with standard off-the-shelf inductors and minimal external components. Its internal switch features 1.1-V typical saturation voltage at 0.5-A load and supports duty cycles from 0% to 100%.
It includes dedicated functional pins for system-level supervision: an open-collector Error_Flag output activated when VOUT drops >5%, a Delay pin for programmable flag assertion delay, and a Bias_Supply (VBS) input that powers internal circuitry from VOUT - reducing quiescent current and improving efficiency under high-input-voltage, light-load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 0.5 A DC maximum - supports mid-power point-of-load conversion without external current boosting. |
| Input Voltage Range | 4.5 V to 60 V - enables direct regulation from 48-V telecom, automotive battery, or industrial bus rails. |
| Output Voltage Range | 1.2 V to 37 V (adjustable via external resistor divider) - covers wide range of logic, analog, and mixed-signal rail requirements. |
| Switching Frequency | 150 kHz (±15%) - allows use of low-cost, low-ESR electrolytic or ceramic output capacitors and standard 100–150 μH inductors. |
| Feedback Reference Voltage | 1.23 V (±2.5% over temperature) - sets precision for output voltage programming with <±4% total regulation error. |
| Standby Quiescent Current | 140 μA typical (LM2597HV) - enables ultra-low-power shutdown mode suitable for battery-backed or energy-sensitive systems. |
| Thermal Protection | Internal thermal shutdown with automatic recovery - prevents damage during sustained overload or poor PCB heat sinking. |
Pinout & Package
LM2597HVN-ADJ/NOPB is packaged in an 8-pin SOIC (D package), body size 4.90 mm × 3.91 mm, with exposed pad not present. The package supports surface-mount reflow assembly and provides adequate thermal dissipation (RθJA = 95°C/W) for 0.5-A operation without heatsink under typical PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Error_Flag | Open-collector output | Asserts low when VOUT falls >5% below nominal - usable as microprocessor reset signal after programmable delay. |
| 2 - Delay | Capacitor-connected timing node | Sets delay between VOUT reaching 95% and Error_Flag deassertion - enables controlled power-good sequencing. |
| 3 - Bias_Supply (VBS) | Power input for internal circuitry | Accepts 3.5–30 V; connecting to VOUT reduces VIN current draw and improves efficiency at high VIN/low VOUT. |
| 4 - Feedback (FB) | Inverting input of error amplifier | Senses divided output voltage; reference is 1.23 V - determines regulated output via R1/R2 divider ratio. |
| 5 - Shutdown/Soft-Start (SD/SS) | Dual-function digital input | Pull ≤0.6 V to shut down (IQ ≈ 140 μA); add capacitor for controlled VOUT ramp-up and reduced inrush current. |
| 6 - Ground | Power and signal reference | Common return for internal switch, error amplifier, and bias circuitry - requires low-impedance PCB connection. |
| 7 - +VIN | Main power input | Accepts 4.5–60 V DC; requires local 100-nF ceramic bypass capacitor to suppress switching transients. |
| 8 - Output | Internal N-channel switch drain | Switches between ~−0.5 V and (VIN − VSAT) at 150 kHz - connects to external diode/inductor node in buck topology. |
Key Features
| Feature | Design Value |
|---|---|
| Bias Supply (VBS) Pin | Enables powering internal circuitry from VOUT instead of VIN - reduces total input current by ~4 mA and improves efficiency by up to 5% at VIN = 48 V, VOUT = 5 V, ILOAD = 100 mA. |
| Programmable Soft-Start | Capacitor on SD/SS pin controls output voltage ramp time - limits inrush current to ≤160 mA (vs. 700 mA without), preventing input rail collapse. |
| Error Flag with Delay | Open-drain flag asserts low on undervoltage; delay pin adds user-defined hold-off before flag release - supports reliable power-good signaling in multi-rail systems. |
| Integrated Protection | Two-stage current limit (0.8 A peak) + thermal shutdown - sustains safe operation during short-circuit or overload without external sensing components. |
| High-Voltage Input Rating | 60-V absolute maximum VIN (LM2597HV version) - eliminates need for pre-regulation stages in 48-V industrial or PoE-powered applications. |
Applications
| Industrial 24/48-V Power Conversion | Embedded System Point-of-Load Regulation |
|---|---|
|
Use Scenario: Converting 48-V DC distribution bus to 3.3-V or 5-V for microcontrollers, FPGAs, and sensors in factory automation controllers. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, efficient, and well-regulated low-voltage rails with built-in fault reporting. Use Value: Eliminates need for external current-sense or thermal monitoring; ±4% output accuracy ensures reliable logic-level compliance across temperature. |
Use Scenario: Generating 12-V intermediate rail from 24-V input to feed linear regulators or op-amp circuits in test equipment. IC Role / Device Role / Timing Role: High-efficiency preregulator reducing power loss and heat generation before final LDO stage. Use Value: 88% typical efficiency at VIN = 25 V, VOUT = 12 V, ILOAD = 0.5 A lowers thermal load versus linear solution - extends component lifetime. |
| Positive-to-Negative Inverting Supply | Automotive Body Control Module (BCM) Power |
|
Use Scenario: Generating –5-V rail from 12-V battery for analog front-end circuits requiring dual supplies in instrumentation. IC Role / Device Role / Timing Role: Inverting buck-derived converter using bootstrapped ground configuration and external Schottky diode. Use Value: Supports up to 0.5-A inverted output with standard 100-μH inductor - avoids costly dedicated inverting ICs or transformer-based solutions. |
Use Scenario: Regulating 12-V vehicle battery to 5-V for CAN transceivers and microcontroller peripherals in harsh automotive environments. IC Role / Device Role / Timing Role: Robust buck controller with 60-V input rating, thermal shutdown, and error flag for diagnostics. Use Value: Withstands load-dump transients up to 60 V; 140-μA standby current minimizes battery drain during ignition-off state. |
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-ADJ | Lower input voltage max (40 V vs. 60 V); same 0.5-A rating, 150-kHz frequency, and adjustable output range. | Lacks Bias_Supply (VBS) pin and Error_Flag/delay functionality - simpler but less supervisory capability. | Choose when 40-V input ceiling is sufficient and cost sensitivity outweighs need for power-good signaling or efficiency optimization. |
| LM2678-ADJ | Higher output current (5 A), higher switching frequency (260 kHz), no VBS or Error_Flag pins; requires external compensation. | Designed for high-current, space-constrained applications - lacks integrated soft-start and fault flag outputs. | Choose for >1-A loads where board area permits larger inductor and additional compensation components. |
Compared with LM2596-ADJ, LM2597HVN-ADJ/NOPB adds critical supervision features (Error_Flag, Delay, VBS) for system reliability; compared with LM2678-ADJ, it trades raw current capacity for integration, simplicity, and lower BOM count in sub-1-A designs.
Availability
LM2597HVN-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power conversion, embedded point-of-load regulation, and automotive body electronics requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for LM2597HVN-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 decades of expertise in high-reliability power conversion ICs.
The LM2597HV product line was designed for industrial and automotive applications demanding wide-input-voltage, high-efficiency, and integrated protection - targeting systems where input transients, thermal stress, and supervisory signaling are critical design constraints.
FAQ
What is the maximum input voltage supported by LM2597HVN-ADJ/NOPB?
The LM2597HVN-ADJ/NOPB supports a maximum input voltage of 60 V, as confirmed in the Absolute Maximum Ratings table (Section 7.1) and Recommended Operating Conditions (Section 7.3). This HV rating distinguishes it from the standard LM2597 (40 V max) and enables direct regulation from 48-V telecom or industrial buses without pre-regulation.
How does the Bias_Supply (VBS) pin improve efficiency in LM2597HVN-ADJ/NOPB?
The VBS pin on LM2597HVN-ADJ/NOPB allows internal circuitry to be powered from the regulated output instead of VIN. When connected to VOUT (≥3.5 V), it reduces VIN current draw by ~4 mA and improves efficiency by up to 5% under high-input-voltage, low-output-voltage, light-load conditions - as validated in Figure 19 and Section 8.3.1 of the datasheet.
Can LM2597HVN-ADJ/NOPB be used in an inverting (positive-to-negative) configuration?
Yes, LM2597HVN-ADJ/NOPB supports inverting operation per Figure 24 in the datasheet. By bootstrapping the GND pin to the negative output and grounding the FB pin, it regulates inverted output voltages such as –5 V. A Schottky diode and 100-μH inductor are recommended; maximum |VIN| + |VOUT| must remain ≤60 V for the HV version.
What is the feedback reference voltage and tolerance for LM2597HVN-ADJ/NOPB?
The LM2597HVN-ADJ/NOPB has a feedback reference voltage of 1.23 V, with ±2.5% variation over temperature (Section 7.8). Combined with resistor-divider tolerance, this yields ±4% total output voltage regulation across line, load, and temperature - a key specification verified in all electrical characteristics tables.
Does LM2597HVN-ADJ/NOPB include thermal protection?
Yes, LM2597HVN-ADJ/NOPB includes internal thermal shutdown with automatic recovery, as stated in Features, Description, and Section 7.4 (Thermal Information). Junction temperature is monitored continuously; if it exceeds 150°C, the device halts switching until temperature falls below the hysteresis threshold - protecting against sustained overload or inadequate PCB heat sinking.
LM2597HVN-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM2597HVN-ADJ/NOPB FAQ
1.How can I place an order for LM2597HVN-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2597HVN-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 LM2597HVN-ADJ/NOPB reliable?
The price and inventory of LM2597HVN-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 LM2597HVN-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2597HVN-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2597HVN-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2597HVN-ADJ/NOPB?
LM2597HVN-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2597HVN-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 LM2597HVN-ADJ/NOPB?
For technical support, including LM2597HVN-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2597HVN-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2597HVN-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2597HVN-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 LM2597HVN-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2597HVN-ADJ/NOPB?
All LM2597HVN-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2597HVN-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 LM2597HVN-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2597HVN-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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