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Texas Instruments LM2597HVMX-3.3/NOPB
- Part No.:
- LM2597HVMX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2597HVMX-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM2597HVMX-3.3/NOPB from Texas Instruments is a monolithic nonsynchronous step-down (buck) DC-DC converter IC delivering 3.3 V at up to 0.5 A, with input voltage support up to 60 V, fixed 150-kHz switching frequency, and ±4% output voltage tolerance over line and load. It integrates internal frequency compensation, thermal shutdown, current limiting, and bias supply (VBS) for improved efficiency at high VIN/low VOUT conditions - used in industrial power supplies and automotive subsystems requiring robust 3.3-V rail generation.
For engineers reviewing the LM2597HVMX-3.3/NOPB datasheet, LM2597HVMX-3.3/NOPB pinout, LM2597HVMX-3.3/NOPB application, or LM2597HVMX-3.3/NOPB equivalent, key selection factors include its HV-rated 60-V input capability, 8-pin SOIC package, soft-start/shutdown control, error flag with delay, and bias supply pin optimization for efficiency under light-load/high-input-voltage operation.
Technical Context
The LM2597HVMX-3.3/NOPB implements a fixed-frequency (150 kHz), current-mode controlled buck topology with an integrated N-channel DMOS switch and internal oscillator. Its feedback loop senses output voltage via the FB pin referenced to a 1.23-V internal bandgap, enabling precise regulation without external resistive dividers for fixed-output variants.
It features dual-function Shutdown/Soft-Start (SD/SS) pin for logic-level enable/disable and capacitor-controlled ramp-up, plus dedicated Error_Flag and Delay pins for power-good signaling with programmable startup delay. The Bias_Supply (VBS) pin allows powering internal circuitry from VOUT instead of VIN - critical for reducing quiescent current and improving efficiency when VIN ≫ VOUT (e.g., 48 V → 3.3 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over full line/load/temperature range - ensures stable microcontroller I/O rail without external feedback resistors. |
| Max Input Voltage | 60 V - supports wide-range industrial and automotive inputs (e.g., 24 V, 48 V systems) without pre-regulation. |
| Output Current | 0.5 A continuous - sufficient for powering DSPs, FPGAs, or multiple low-power peripherals from a single regulator. |
| Switching Frequency | 150 kHz (±15%) - enables use of compact, low-cost standard inductors and reduces EMI compared to lower-frequency alternatives. |
| Quiescent Current | Typ. 140 μA in standby (HV version) - minimizes battery drain in always-on monitoring circuits. |
| Efficiency | 80% at VIN = 12 V, IOUT = 0.5 A - achieves high conversion efficiency without complex synchronous rectification. |
| Thermal Resistance | RθJA = 95 °C/W (SOIC-8) - allows full 0.5-A operation with minimal PCB copper area; no heatsink required. |
Pinout & Package
LM2597HVMX-3.3/NOPB is housed in an 8-pin SOIC (D) package (4.90 mm × 3.91 mm body size), surface-mount compatible with standard reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Error_Flag | Open-collector output | Asserts low when VOUT drops >5%; used as hardware reset signal for MCUs after power-up delay. |
| 2 - Delay | Capacitor-connected timing node | Sets delay between VOUT reaching 95% and Error_Flag going high - prevents premature system wake-up. |
| 3 - Bias_Supply (VBS) | Internal circuit power input | Accepts VOUT (≥4 V) to reduce VIN current draw and improve efficiency at high input voltages. |
| 4 - Feedback (FB) | Regulation sense input | Internally referenced to 1.23 V; unused in fixed 3.3-V version but must be connected per datasheet layout guidelines. |
| 5 - Shutdown/Soft-Start (SD/SS) | Dual-function control input | Pulled low disables regulator (ISTBY ≈ 140 μA); capacitor adds soft-start to limit inrush current during startup. |
| 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 V to 60 V; requires local ceramic bypass capacitor to handle high di/dt switching currents. |
| 8 - Output | Internal switch drain | Drives external catch diode and inductor; high dv/dt node - minimize trace area to reduce EMI coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.5-A DMOS switch | Eliminates need for external MOSFET and gate driver - reduces BOM count and layout complexity. |
| Bias Supply (VBS) pin | Enables internal circuitry to run from VOUT instead of VIN, cutting quiescent current and boosting efficiency by ~5–10% at VIN ≥ 24 V. |
| Error_Flag with programmable delay | Provides reliable power-good signaling with adjustable hold-off time - simplifies system reset sequencing without external timers. |
| 150-kHz fixed-frequency operation | Ensures predictable EMI profile and allows use of off-the-shelf, low-DCR shielded inductors (e.g., 68–100 μH). |
| Thermal shutdown + current limiting | Two-stage protection prevents damage during overload or ambient temperature excursions - supports unattended industrial deployment. |
Applications
| Industrial Sensor Node Power | Automotive Body Control Module |
|---|---|
Use Scenario: Remote temperature/humidity sensor node powered from 24-V vehicle bus or 48-V factory line, operating continuously with low duty-cycle wireless transmission. IC Role / Device Role / Timing Role: Primary 3.3-V buck regulator supplying MCU, RF transceiver, and analog front-end - operates in continuous conduction mode with soft-start enabled. Use Value: 60-V input rating tolerates load-dump transients; 140-μA standby current extends battery backup life; Error_Flag synchronizes MCU boot with stable rail. | Use Scenario: Centralized power management for door locks, window lifts, and interior lighting in 12-V/24-V automotive platforms. IC Role / Device Role / Timing Role: Pre-regulator stepping down 24-V nominal bus to clean 3.3-V domain for CAN controller and EEPROM - includes undervoltage lockout via SD/SS pin. Use Value: HV rating withstands ISO 7637-2 pulse 5a (75 V/350 ms); bias supply improves efficiency during idle states; thermal shutdown prevents latch-up in enclosed modules. |
| Programmable Logic Controller (PLC) I/O Card | Test & Measurement Equipment |
Use Scenario: DIN-rail mounted PLC with isolated digital I/O banks requiring tightly regulated 3.3-V logic supply independent of 24-V field power. IC Role / Device Role / Timing Role: Non-isolated buck stage feeding downstream LDOs - configured with external catch diode and 100-μH inductor per TI design guidelines. Use Value: ±4% output tolerance meets industrial logic rail specs; SOIC-8 package supports automated assembly; RθJA = 95 °C/W enables convection-only cooling on dense PCBs. | Use Scenario: Portable oscilloscope or multimeter with battery + wall adapter input, needing efficient 3.3-V rail for ADC, display controller, and USB interface. IC Role / Device Role / Timing Role: Main DC-DC converter in multi-rail power tree - uses VBS pin tied to VOUT to minimize no-load power draw from Li-ion battery. Use Value: 80% efficiency at 0.5 A reduces heat in sealed enclosure; soft-start prevents brownout during battery insertion; shutdown pin enables firmware-controlled sleep mode. |
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-3.3/NOPB | Lower max input voltage (40 V vs. 60 V); same pinout, package, and electrical specs otherwise. | Not suitable for 48-V systems or automotive load-dump conditions requiring >45 V tolerance. | Select LM2597MX-3.3/NOPB only if input never exceeds 40 V and cost is primary constraint. |
| LM2678-3.3/NOPB | Higher output current (5 A vs. 0.5 A); 260-kHz switching; different pinout and package (TO-220-7/HSOIC-8). | Requires PCB redesign; suited for high-current applications where LM2597HVMX-3.3/NOPB would thermally saturate. | Choose LM2678-3.3/NOPB when load exceeds 0.5 A or higher efficiency at full load is mandatory. |
Compared with LM2597MX-3.3/NOPB, the LM2597HVMX-3.3/NOPB provides essential 60-V input headroom for harsh environments; versus LM2678-3.3/NOPB, it offers lower cost, smaller footprint, and simpler magnetics for sub-0.5-A loads - making it optimal for space-constrained, medium-voltage industrial converters.
Availability
LM2597HVMX-3.3/NOPB is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, and PLC I/O cards requiring stable component supply with long-term manufacturability and consistent parametric performance.
Supply support for LM2597HVMX-3.3/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 specifically for industrial and automotive applications demanding wide-input-voltage DC-DC regulation with integrated protection and ease of implementation - targeting engineers who prioritize robustness, layout simplicity, and qualification-ready components.
FAQ
What is the maximum input voltage rating for LM2597HVMX-3.3/NOPB?
The LM2597HVMX-3.3/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 use in 48-V systems and automotive applications subject to load-dump transients per ISO 7637-2.
Does LM2597HVMX-3.3/NOPB require an external feedback resistor network?
No, LM2597HVMX-3.3/NOPB does not require external feedback resistors because it is a fixed-output 3.3-V variant. The feedback divider is internal; Pin 4 (FB) is internally connected to the 1.23-V reference and must be left unconnected or terminated per TI layout recommendations - unlike the adjustable version which requires external resistors.
Can the Bias_Supply (VBS) pin be used with the 3.3-V output of LM2597HVMX-3.3/NOPB?
No, the VBS pin cannot be directly connected to the 3.3-V output of LM2597HVMX-3.3/NOPB. Section 8.3.1 states the VBS pin requires a minimum of approximately 4 V at room temperature (4 V at −40°C) to operate reliably. Since 3.3 V falls below this threshold, the VBS pin must be left open, and internal circuitry will be powered from VIN instead.
What is the purpose of the Delay pin on LM2597HVMX-3.3/NOPB?
Pin 2 (Delay) on LM2597HVMX-3.3/NOPB sets the time interval between when the output reaches 95% of nominal (3.135 V) and when the Error_Flag pin transitions high. A capacitor connected from Delay to ground determines this delay - enabling controlled power-good assertion to prevent premature MCU initialization before rail stabilization.
Is LM2597HVMX-3.3/NOPB RoHS-compliant and lead-free?
Yes, LM2597HVMX-3.3/NOPB is RoHS-compliant and lead-free, as indicated by the "/NOPB" suffix in the part number (per TI's naming convention) and confirmed in the "Orderable Addendum" section of the SNVS119D datasheet, which lists this variant under Pb-Free & Green packaging options.
LM2597HVMX-3.3/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):
- 3.3V
- 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-3.3/NOPB FAQ
1.How can I place an order for LM2597HVMX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2597HVMX-3.3/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-3.3/NOPB reliable?
The price and inventory of LM2597HVMX-3.3/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-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2597HVMX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2597HVMX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2597HVMX-3.3/NOPB?
LM2597HVMX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2597HVMX-3.3/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-3.3/NOPB?
For technical support, including LM2597HVMX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2597HVMX-3.3/NOPB requirements.
6.How does Aetrix verify that LM2597HVMX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2597HVMX-3.3/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-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2597HVMX-3.3/NOPB?
All LM2597HVMX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2597HVMX-3.3/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-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2597HVMX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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