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Texas Instruments LM2597HVMX-12/NOPB
- Part No.:
- LM2597HVMX-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2597HVMX-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,110
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Product details
Overview
LM2597HVMX-12/NOPB from Texas Instruments is a monolithic nonsynchronous step-down (buck) DC-DC converter IC delivering 0.5-A output current with fixed 12-V output, 150-kHz fixed-frequency switching, and input voltage support up to 60 V. It integrates internal frequency compensation, thermal shutdown, current limiting, and bias supply (VBS) functionality for improved efficiency at high VIN/low VOUT conditions. Used in industrial power supplies and automotive subsystems requiring robust 12-V regulation from wide-input sources.
For engineers reviewing the LM2597HVMX-12/NOPB datasheet, LM2597HVMX-12/NOPB pinout, LM2597HVMX-12/NOPB application, or LM2597HVMX-12/NOPB equivalent, key selection criteria include its 60-V max input rating, ±4% output voltage tolerance over line/load/temperature, 85-μA standby current, integrated soft-start/shutdown control, and SOIC-8 surface-mount package compatibility with standard PCB layout practices.
Technical Context
The LM2597HVMX-12/NOPB implements a nonsynchronous buck topology with a fixed 150-kHz oscillator and internal current-mode control. Its bias supply (VBS) pin enables powering internal circuitry from the regulated 12-V output-reducing quiescent current draw from VIN and improving efficiency by up to 5% under high-input/low-load conditions.
It features an open-collector error flag with built-in 5% dropout detection and programmable delay via external capacitor, plus dual-function shutdown/soft-start pin supporting logic-level disable and controlled output ramp-up. Protection includes two-stage current limit, thermal shutdown, and absolute maximum ratings aligned with industrial operating temperatures (–40°C to +125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over full line, load, and temperature range - ensures stable rail for downstream logic and analog circuits without external feedback resistors. |
| Max Input Voltage | 60 V - supports direct connection to unregulated 48-V telecom, industrial, or automotive battery systems without pre-regulation. |
| Output Current | 0.5 A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in compact embedded systems. |
| Switching Frequency | 150 kHz (±15%) - enables use of low-cost, off-the-shelf 100–220 μH inductors and reduces EMI compared to higher-frequency alternatives. |
| Standby Quiescent Current | 140 μA typical at 25°C - minimizes battery drain in always-on monitoring or wake-on-event applications. |
| Efficiency | 88% typical at VIN = 25 V, IOUT = 0.5 A - reduces thermal stress on PCB copper traces, eliminating need for dedicated heatsinking in most layouts. |
| Package | SOIC-8 (4.90 mm × 3.91 mm) - surface-mount compatible with automated assembly and provides adequate thermal resistance (RθJA = 95°C/W). |
Pinout & Package
LM2597HVMX-12/NOPB is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package with 1.27-mm pitch, JEDEC MS-012AC compliant, and rated for operation from –40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Error_Flag | Open-collector output | Asserts low when VOUT drops below 95% of 12 V; used as power-good signal or microcontroller reset with configurable delay. |
| 2 - Delay | Capacitor connection node | Sets time delay between VOUT reaching 95% and Error_Flag going high; enables sequencing in multi-rail systems. |
| 3 - Bias_Supply (VBS) | Power input for internal circuitry | Accepts 3.5–30 V; connecting to 12-V output reduces VIN current draw and improves efficiency at high input voltages. |
| 4 - Feedback | Input (not used in fixed 12-V version) | Internally tied to reference; left unconnected per datasheet - no external resistor divider required. |
| 5 - Shutdown/Soft-Start | Dual-function digital input | Pull ≤0.6 V to shut down (IQ ≈ 140 μA); add capacitor for soft-start to limit inrush and control VOUT ramp rate. |
| 6 - Ground | Power and signal reference | Common return for internal switch, control circuitry, and external components; requires low-impedance PCB plane. |
| 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 NPN switch collector | Switches between (VIN − VSAT) and ≈−0.5 V; connects to external catch diode and inductor; minimal copper area recommended. |
Key Features
| Feature | Design Value |
|---|---|
| Bias Supply (VBS) Pin | Enables powering internal regulator circuitry from 12-V output instead of VIN - cuts total input current by ~4 mA and boosts efficiency by up to 5% at VIN > 30 V. |
| Integrated Soft-Start | Programmable output voltage ramp via external capacitor on pin 5 - limits inrush current to ≤160 mA (vs. 700 mA without), protecting input sources and downstream capacitors. |
| Error Flag with Delay | Open-drain output with user-set delay (via pin 2 capacitor) - provides clean power-good assertion after stabilization, suitable for MCU reset timing. |
| Thermal & Current Protection | Two-stage current limit (0.58–1.4 A peak) and thermal shutdown at 150°C - prevents damage during overload, short-circuit, or poor heatsinking scenarios. |
| Wide Input Range | Operates from 4.5 V to 60 V - eliminates need for preregulators in 24-V/48-V industrial or 12–42-V automotive battery-fed designs. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Providing stable 12-V rail for PLC I/O modules, sensor interfaces, and CAN transceivers in factory automation cabinets exposed to 36–57-V DC bus fluctuations. IC Role / Device Role / Timing Role: Primary step-down regulator converting unregulated 48-V DC to isolated 12-V supply; operates at fixed 150-kHz frequency to simplify EMI filtering. Use Value: 60-V input rating tolerates load-dump transients; ±4% output accuracy ensures reliable logic-level signaling across temperature; SOIC-8 footprint simplifies conformal coating and mechanical mounting. |
Use Scenario: Generating 12-V power for door lock actuators, window lift controllers, and interior lighting in 12-V vehicle architectures with cold-crank (4.5-V) and load-dump (60-V) events. IC Role / Device Role / Timing Role: Buck converter supplying regulated 12-V to motor drivers and microcontrollers; uses VBS pin connected to output to maintain efficiency during engine-off battery operation. Use Value: 140-μA standby current extends battery life during vehicle sleep mode; thermal shutdown prevents failure during prolonged actuator stall conditions. |
| Telecom Remote Radio Unit | Test Equipment Auxiliary Supply |
|
Use Scenario: Converting -48-V telecom supply to +12-V for RF front-end biasing and FPGA configuration in outdoor small-cell base stations. IC Role / Device Role / Timing Role: Positive-to-negative converter configured in inverting topology (per Figure 24); uses LM2597HVMX-12/NOPB's ground-referenced control pins with level-shifted shutdown. Use Value: Fixed 12-V version simplifies design vs. adjustable part; 150-kHz switching allows compact magnetics; error flag signals power integrity to system controller during brownout. |
Use Scenario: On-board 12-V supply for DUT power sequencing in automated test equipment handling mixed-signal devices requiring precise voltage rails. IC Role / Device Role / Timing Role: Secondary regulator fed from main 24-V supply; soft-start (pin 5) synchronizes with system enable signal to prevent test fixture false triggers. Use Value: Programmable delay (pin 2) aligns 12-V rail availability with other rails; ±4% tolerance meets Class II instrument power spec; SOIC-8 allows rework-friendly layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2597MX-12/NOPB | Standard-voltage version: max VIN = 40 V (vs. 60 V); identical pinout, features, and 12-V output spec. | Not suitable for 48-V telecom or load-dump-prone automotive systems; limited to ≤40-V input applications. | Select LM2597MX-12/NOPB only if input never exceeds 40 V and cost sensitivity outweighs headroom requirements. |
| LM2678-12DDAR | Higher current (5 A), same 12-V fixed output, but 260-kHz switching and different pinout; no VBS or delay pin. | Lacks programmable error flag delay and bias supply optimization; requires redesign of feedback, soft-start, and thermal layout. | Choose LM2678-12DDAR only when ≥3-A output is required and board space permits larger inductor/capacitor footprint. |
Compared with LM2597MX-12/NOPB, the LM2597HVMX-12/NOPB adds 20-V input headroom critical for transient resilience, while LM2678-12DDAR trades feature granularity for raw current capacity-neither offers drop-in replacement due to electrical or mechanical incompatibility.
Availability
LM2597HVMX-12/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom remote units, and test equipment auxiliary supplies requiring stable component supply and long-term manufacturability.
Supply support for LM2597HVMX-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 series was designed for rugged step-down regulation in harsh environments-targeting industrial, automotive, and telecom applications where wide input range, integrated protection, and SOIC-packaged simplicity are essential.
FAQ
What is the maximum input voltage rating for LM2597HVMX-12/NOPB?
The LM2597HVMX-12/NOPB has an absolute maximum input voltage rating of 60 V, with recommended operating range from 4.5 V to 60 V. This HV designation distinguishes it from the standard LM2597 (max 40 V) and enables direct use in 48-V systems subject to load-dump transients. Operation above 40 V requires verification of thermal performance using RθJA = 95°C/W and appropriate PCB copper area.
Does LM2597HVMX-12/NOPB require external feedback resistors?
No, LM2597HVMX-12/NOPB is a fixed-output variant with internal feedback network set to 12 V. Pin 4 (Feedback) is not connected externally and must remain unpopulated per TI datasheet guidance. This eliminates resistor tolerance errors and simplifies layout versus adjustable versions like LM2597HVMX-ADJ.
How does the Bias Supply (VBS) pin improve efficiency in LM2597HVMX-12/NOPB?
The VBS pin on LM2597HVMX-12/NOPB allows internal circuitry to be powered from the regulated 12-V output instead of VIN. At high input voltages (e.g., 48 V), this reduces VIN current draw by ~4 mA and increases overall efficiency by up to 5%, particularly under light loads. The VBS pin requires ≥3.5 V and must be wired directly to the 12-V output node.
Can LM2597HVMX-12/NOPB be used in inverting (positive-to-negative) configurations?
Yes, LM2597HVMX-12/NOPB supports inverting topologies per TI Application Note SNVS119D Figure 24. In this mode, the IC's ground pin floats at the negative output voltage, requiring level-shifted shutdown control and an additional Schottky diode. Maximum |VIN| + |VOUT| must not exceed 60 V, and startup current can reach 0.8 A briefly-soft-start (pin 5) is strongly recommended.
What protection features are integrated into LM2597HVMX-12/NOPB?
LM2597HVMX-12/NOPB integrates thermal shutdown (activates at 150°C junction), two-stage current limiting (0.58–1.4 A peak), and undervoltage lockout (4.5 V min). It also provides out-of-regulation detection via the Error_Flag pin and soft-start to limit inrush. These features eliminate need for external protection circuitry in most industrial and automotive implementations.
LM2597HVMX-12/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:
- 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
LM2597HVMX-12/NOPB FAQ
1.How can I place an order for LM2597HVMX-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2597HVMX-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 LM2597HVMX-12/NOPB reliable?
The price and inventory of LM2597HVMX-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 LM2597HVMX-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2597HVMX-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2597HVMX-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2597HVMX-12/NOPB?
LM2597HVMX-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2597HVMX-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 LM2597HVMX-12/NOPB?
For technical support, including LM2597HVMX-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2597HVMX-12/NOPB requirements.
6.How does Aetrix verify that LM2597HVMX-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2597HVMX-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 LM2597HVMX-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2597HVMX-12/NOPB?
All LM2597HVMX-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2597HVMX-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 LM2597HVMX-12/NOPB part is unused and in its original packaging.
Return procedure for LM2597HVMX-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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