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Texas Instruments LM2597HVN-12/NOPB
- Part No.:
- LM2597HVN-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2597HVN-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM2597HVN-12/NOPB from Texas Instruments is a monolithic 150-kHz nonsynchronous step-down (buck) DC-DC converter delivering up to 0.5 A with fixed 12-V output, ±4% output voltage tolerance over line and load, 4.5–60 V input range, and integrated shutdown/soft-start, error flag, and bias supply (VBS) functionality-used in industrial power supplies and embedded system preregulation.
For engineers reviewing the LM2597HVN-12/NOPB datasheet, LM2597HVN-12/NOPB pinout, LM2597HVN-12/NOPB application, or LM2597HVN-12/NOPB equivalent, key selection criteria include verified 12-V fixed output accuracy, HV-grade 60-V max input rating, thermal performance under 0.5-A load, soft-start timing control via external capacitor, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2597HVN-12/NOPB implements a fixed-frequency current-mode buck topology with internal 150-kHz oscillator and two-stage current limiting. Its bias supply (VBS) pin enables powering internal circuitry from the regulated 12-V output-improving efficiency at high VIN/low IOUT conditions-and its open-collector Error_Flag pin provides regulated output dropout detection with programmable delay via external capacitor on the Delay pin.
It features integrated thermal shutdown, ±4% output voltage regulation across –40°C to +125°C, and operates with minimal external components: one diode, one inductor, and two capacitors. The Shutdown/Soft-Start pin supports both logic-level disable (ISTBY = 140–250 μA) and controlled ramp-up via external capacitor, eliminating inrush current spikes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over full temperature and load range-ensures stable rail for downstream logic or analog circuitry without feedback resistor network. |
| Input Voltage Range | 4.5 V to 60 V-supports wide industrial input sources including 24-V and 48-V systems, battery stacks, and unregulated adapters. |
| Max Output Current | 0.5 A continuous-sufficient for powering microcontrollers, sensors, or interface ICs in space-constrained designs. |
| Switching Frequency | 150 kHz ±15%-enables use of compact, low-cost standard inductors (e.g., 68–100 µH) while minimizing EMI compared to higher-frequency alternatives. |
| Quiescent Current | Typ. 140 µA in shutdown-reduces standby power in always-on systems; operating IQ = 5–10 mA enables efficient light-load operation. |
| Efficiency | 88% at VIN = 25 V, VOUT = 12 V, IOUT = 0.5 A-minimizes thermal stress and PCB copper area required for heat sinking. |
| Thermal Resistance | RθJA = 150 °C/W (PDIP-8)-validates use in natural-convection environments without forced air or heatsinks at ≤0.5-A load. |
Pinout & Package
LM2597HVN-12/NOPB is supplied in an 8-pin PDIP package (9.81 mm × 6.35 mm), optimized for through-hole prototyping and industrial board assembly with robust thermal and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Error_Flag | Open-collector output | Asserts low when VOUT drops >5% below 12 V; used as hardware reset signal for MCUs after power-up delay set by external capacitor on Pin 2. |
| 2 - Delay | Capacitor connection | Sets time delay between VOUT reaching 95% of 12 V and Error_Flag going high-prevents premature system wake-up during soft-start. |
| 3 - Bias_Supply (VBS) | Power input for internal circuitry | Accepts 3.5–30 V; connecting to 12-V output improves efficiency at high VIN/low IOUT-critical for 48-V input → 12-V conversion. |
| 4 - Feedback | Regulation sense input | Internally tied to 12-V reference; unused in fixed-output version-must be left open per datasheet. |
| 5 - Shutdown/Soft-Start | Dual-function control input | Pulled low disables regulator (ISTBY ≈ 140 µA); capacitor added enables controlled VOUT ramp-limits inrush to <160 mA. |
| 6 - Ground | Power and signal reference | Common return for internal switch, control circuitry, and external components-requires low-impedance PCB plane connection. |
| 7 - +VIN | Main power input | Accepts 4.5–60 V; requires local 100-nF ceramic bypass capacitor to suppress switching transients and supply peak currents. |
| 8 - Output | Internal N-channel switch drain | Switches between (VIN − VSAT) and ≈−0.5 V at 150 kHz; connects to catch diode anode and inductor-PCB trace must be minimized to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Bias Supply (VBS) Pin | Enables powering internal circuitry from 12-V output-reducing total input current by ~3–4 mA at high VIN, directly improving system efficiency in 48-V→12-V applications. |
| Integrated Soft-Start | External capacitor on Pin 5 controls output voltage ramp rate-suppresses inrush current to ≤160 mA and eliminates need for discrete undervoltage lockout circuitry. |
| Error Flag with Programmable Delay | Open-drain output with user-defined delay ensures reliable MCU reset assertion only after stable 12-V rail is established-eliminates race conditions in boot sequencing. |
| Two-Stage Current Limit | Peak current limit (0.65–1.3 A) followed by foldback reduces thermal stress during short-circuit events-enables self-recovery without latch-off or external protection. |
| Thermal Shutdown Protection | Activates at TJ ≥ 150°C and holds until junction cools by ≥15°C-prevents permanent damage during sustained overload or poor airflow conditions. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Converting 24-V vehicle battery or 48-V telecom supply to stable 12-V rail for microcontroller, CAN transceiver, and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, regulated 12-V domain with built-in fault signaling and soft-start for cold-cranking immunity. Use Value: 60-V input rating withstands load-dump transients; Error_Flag provides fail-safe reset to MCU during brownout; VBS pin maintains efficiency across wide input range. | Use Scenario: Generating 12-V auxiliary power from main battery in body control units managing door locks, lighting, and HVAC actuators. IC Role / Device Role / Timing Role: High-reliability buck converter with thermal and overcurrent protection-operating continuously across –40°C to +125°C ambient. Use Value: PDIP package offers mechanical robustness for vibration-prone environments; 88% efficiency minimizes heat buildup in sealed enclosures. |
| Programmable Logic Controller (PLC) I/O Module | Test & Measurement Equipment |
Use Scenario: Providing clean, regulated 12-V supply to isolated digital I/O channels and analog front-end circuitry in modular PLC backplanes. IC Role / Device Role / Timing Role: Pre-regulator feeding linear regulators or LDOs-reducing thermal load and enabling precise low-noise rails. Use Value: Fixed 12-V output eliminates trimming resistors; ±4% tolerance ensures consistent channel calibration; shutdown pin enables remote power cycling. | Use Scenario: Powering FPGA configuration circuitry, ADC reference buffers, and display drivers in portable bench instruments with limited thermal headroom. IC Role / Device Role / Timing Role: Compact, self-contained DC-DC stage replacing bulky discrete solutions-integrating oscillator, gate drive, and protection. Use Value: 150-kHz switching allows small magnetics; soft-start prevents measurement offset during power-on; PDIP facilitates manual rework and validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2597N-12/NOPB | Standard-voltage version: max VIN = 40 V vs. 60 V for LM2597HVN-12/NOPB; identical pinout, package, and 12-V output spec. | Not suitable for 48-V systems or load-dump scenarios exceeding 40 V; acceptable for 24-V industrial or lab equipment. | Select LM2597N-12/NOPB only if input never exceeds 40 V-reduces cost where HV rating is unnecessary. |
| LM2596-12 | Same 12-V fixed output and 0.5-A rating, but 150-kHz frequency, SO-8 package, and no VBS or Delay pins-lacks bias supply efficiency boost and programmable error flag delay. | Requires external soft-start or reset IC for sequenced power-up; less suited for high-input-voltage or precision reset-timing applications. | Choose LM2596-12 for surface-mount production where board space is constrained and VBS/delay features are not required. |
Compared with LM2597N-12/NOPB, the LM2597HVN-12/NOPB adds 20-V input headroom critical for automotive and industrial transients; versus LM2596-12, it delivers superior system-level integration via VBS, Delay, and Error_Flag-reducing BOM count and improving startup reliability.
Availability
LM2597HVN-12/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and programmable logic controller I/O modules requiring stable component supply, long-lifecycle support, and through-hole manufacturability.
Supply support for LM2597HVN-12/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 rugged industrial and automotive applications demanding wide-input-voltage DC-DC conversion with integrated protection, soft-start, and supervisory functions-targeting systems where input transients, thermal constraints, and startup sequencing are critical.
FAQ
What is the maximum input voltage rating for LM2597HVN-12/NOPB?
The LM2597HVN-12/NOPB supports a maximum input voltage of 60 V, distinguishing it from the standard LM2597N-12/NOPB (40 V max). This HV rating enables reliable operation in 48-V battery systems, telecom rectifiers, and automotive load-dump conditions-verified per Absolute Maximum Ratings table in the TI SNVS119D datasheet.
Does LM2597HVN-12/NOPB require external feedback resistors?
No, LM2597HVN-12/NOPB is a fixed-output 12-V regulator with internal feedback divider. Pin 4 (Feedback) is not connected internally for this variant and must be left open-confirmed in the Pin Functions table and Description section of the datasheet. External resistors are only needed for the adjustable version.
How does the Bias Supply (VBS) pin improve efficiency in LM2597HVN-12/NOPB?
Connecting the VBS pin to the 12-V output powers internal circuitry instead of drawing from VIN-reducing total input current by ~3–4 mA. This yields measurable efficiency gains at high input voltages (e.g., 48 V → 12 V) and light loads, as shown in Figure 19 and 20 of the LM2597HVN-12/NOPB datasheet.
Can LM2597HVN-12/NOPB be used in an inverting (positive-to-negative) configuration?
Yes, LM2597HVN-12/NOPB supports inverting operation (e.g., +24 V → –12 V) using the topology in Figure 24 of the datasheet. However, the maximum voltage across the IC becomes |VIN| + |VOUT|-so for –12 V output, VIN must be ≤ 28 V to stay within the 40-V absolute maximum rating (60 V for HV version applies only to VIN-to-GND).
What is the purpose of the Delay pin on LM2597HVN-12/NOPB?
The Delay pin (Pin 2) sets the time interval between the regulated 12-V output reaching 95% and the Error_Flag (Pin 1) transitioning high. An external capacitor determines this delay-ensuring MCU reset remains asserted until the rail is fully stabilized, preventing premature firmware execution during power-up.
LM2597HVN-12/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:
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM2597HVN-12/NOPB FAQ
1.How can I place an order for LM2597HVN-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2597HVN-12/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-12/NOPB reliable?
The price and inventory of LM2597HVN-12/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-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2597HVN-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2597HVN-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2597HVN-12/NOPB?
LM2597HVN-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2597HVN-12/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-12/NOPB?
For technical support, including LM2597HVN-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2597HVN-12/NOPB requirements.
6.How does Aetrix verify that LM2597HVN-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2597HVN-12/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-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2597HVN-12/NOPB?
All LM2597HVN-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2597HVN-12/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-12/NOPB part is unused and in its original packaging.
Return procedure for LM2597HVN-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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