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Texas Instruments LM2597HVN-3.3/NOPB
- Part No.:
- LM2597HVN-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2597HVN-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,072
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Product details
Overview
LM2597HVN-3.3/NOPB from Texas Instruments is a monolithic nonsynchronous step-down (buck) DC-DC converter delivering 3.3 V at up to 0.5 A, with 150-kHz fixed-frequency operation, ±4% output voltage tolerance over line/load/temperature, 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, embedded system rails, and automotive auxiliary converters.
For engineers reviewing the LM2597HVN-3.3/NOPB datasheet, LM2597HVN-3.3/NOPB pinout, LM2597HVN-3.3/NOPB application, or LM2597HVN-3.3/NOPB equivalent, key selection criteria include its HV-rated 60-V input capability, bias supply (VBS) pin for efficiency optimization at high VIN/low VOUT, 85-μA standby current, and SOIC-8 surface-mount package compatibility with standard PCB layout practices.
Technical Context
The LM2597HVN-3.3/NOPB implements a current-mode controlled buck topology with a built-in 150-kHz oscillator, two-stage current limiting, thermal shutdown, and internal compensation. Its feedback loop references a precise 1.23-V internal bandgap, enabling stable regulation without external compensation components.
It supports three distinct operating modes: normal regulation (with VBS optionally connected to VOUT for improved efficiency), shutdown (reducing IQ to 140 μA typical), and soft-start (via capacitor on SD/SS pin). The error flag output provides regulated dropout detection with programmable delay via external capacitor on the DELAY pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over full line, load, and temperature range - ensures reliable logic rail compliance for 3.3-V microcontrollers and FPGAs. |
| Max Input Voltage | 60 V - enables direct use in 48-V industrial, telecom, and automotive battery-supplied systems without pre-regulation. |
| Output Current | 0.5 A continuous - sufficient for powering multiple low-power peripherals or single-core embedded processors. |
| Switching Frequency | 150 kHz (±15%) - allows use of compact, low-cost off-the-shelf inductors and reduces EMI compared to lower-frequency alternatives. |
| Standby Quiescent Current | 140 μA typical (LM2597HV) - minimizes battery drain in always-on monitoring or sensor nodes. |
| Efficiency | 80% at VIN = 12 V, IOUT = 0.5 A - delivers high conversion efficiency without requiring heatsinking under typical loads. |
| Feedback Reference Voltage | 1.23 V - sets output via resistor divider; enables accurate trimming or monitoring of regulation status. |
Pinout & Package
LM2597HVN-3.3/NOPB is packaged in an 8-pin SOIC (D package), body size 4.90 mm × 3.91 mm, with exposed pad not present and RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FLAG) | Open-collector error flag output | Asserts low when VOUT drops below 95% of nominal; used as power-good signal or microcontroller reset source. |
| 2 (DELAY) | Delay timing node | Accepts external capacitor to set time between VOUT reaching 95% and FLAG going high - prevents premature system wake-up. |
| 3 (VBS) | Bias supply input | Allows internal circuitry to be powered from VOUT instead of VIN - improves efficiency at high VIN/low VOUT (e.g., 48 V → 3.3 V). |
| 4 (FB) | Feedback input | Monitors output via resistor divider; internally referenced to 1.23 V - no external reference required for fixed-output version. |
| 5 (SD/SS) | Shutdown/Soft-start control | Pulled low to enter 140-μA standby mode; capacitor added for controlled VOUT ramp-up - limits inrush current during cold start. |
| 6 (GND) | Power ground | Main return path for switch current and control circuitry - requires low-impedance connection to minimize noise and thermal rise. |
| 7 (+VIN) | Input supply | Accepts 4.5 V to 60 V DC - must be bypassed with low-ESR ceramic capacitor close to pin to suppress switching transients. |
| 8 (SW) | Internal power switch output | Drives external catch diode and inductor; swings between ~−0.5 V and (VIN − VSAT); requires minimal copper area to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage input rating | 60-V absolute maximum input enables direct integration into 48-V systems without front-end buck pre-regulators. |
| VBS bias supply pin | Reduces power dissipation by powering internal circuitry from VOUT - increases efficiency by up to 5% at VIN = 48 V, VOUT = 3.3 V, light load. |
| Integrated soft-start | Capacitor-programmable startup ramp eliminates output overshoot and limits peak input current to ≤160 mA (vs. 700 mA without). |
| Out-of-regulation error flag | Provides fail-safe indication with built-in 5% dropout threshold and user-adjustable delay - suitable for watchdog and system reset functions. |
| Thermal and current protection | Combines foldback current limiting and thermal shutdown - ensures robust operation under short-circuit or overload conditions. |
Applications
| Industrial Power Supply | Automotive Auxiliary Rail |
|---|---|
|
Use Scenario: Generating a stable 3.3-V rail from a 24-V or 48-V factory bus for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, regulated DC power with fault reporting via FLAG pin. Use Value: Eliminates need for discrete MOSFET + controller design; 60-V input withstands load-dump transients up to ISO 7637-2 Pulse 5a. |
Use Scenario: Powering infotainment MCU cores and CAN transceivers from vehicle battery (9–16 V nominal, up to 40 V during cranking). IC Role / Device Role / Timing Role: Buck converter supplying clean 3.3-V logic power with soft-start to prevent brownout during engine start. Use Value: 140-μA standby current extends battery life in parked-state monitoring; FLAG output triggers system reset on undervoltage events. |
| Embedded System Board Power | Positive-to-Negative Converter |
|
Use Scenario: On-board DC-DC conversion for FPGA configuration, memory, and peripheral ICs in edge computing gateways. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator replacing linear regulators to improve thermal performance and efficiency. Use Value: SOIC-8 footprint simplifies layout; 150-kHz switching enables small 10–22-μH inductors and reduces board area vs. 500-kHz alternatives. |
Use Scenario: Generating −3.3 V from +12 V for analog front-end op-amps or RS-232 level shifters in test equipment. IC Role / Device Role / Timing Role: Inverting buck-boost topology using LM2597HVN-3.3/NOPB's SW and GND pins reconfigured per Figure 24. Use Value: Leverages same IC for dual-polarity rails - avoids sourcing separate inverting controllers; supports up to 200-mA negative output with proper component selection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596-3.3 | Lower max input voltage (40 V vs. 60 V); no VBS pin; same 0.5-A rating and 150-kHz frequency. | Limited to 24-V or lower input systems; lacks efficiency optimization for high VIN/low VOUT cases. | Select when cost sensitivity outweighs HV requirement and VBS benefit is unnecessary. |
| TPS54302DDCR | Synchronous buck, 36-V max input, 3-A output, 2.5-MHz switching, integrated high-side/low-side FETs. | Higher current, smaller solution size, but requires external compensation and lacks FLAG/delay features. | Choose for space-constrained designs needing >0.5 A or higher efficiency above 1 A, accepting trade-off in supervision functionality. |
Compared with LM2596-3.3, LM2597HVN-3.3/NOPB adds 20-V input headroom and VBS-driven efficiency gains; versus TPS54302DDCR, it trades higher current and frequency for built-in fault signaling and simpler design-in - making it optimal for ruggedized 3.3-V rails where supervision and HV tolerance are critical.
Availability
LM2597HVN-3.3/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive auxiliary rails, and embedded system board power requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2597HVN-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 DC-DC conversion solutions.
The LM2597HV product line was designed specifically for industrial and automotive applications demanding wide-input-voltage step-down regulation with integrated supervision features - targeting systems where input transients, thermal constraints, and functional safety signaling are critical.
FAQ
What is the maximum input voltage supported by the LM2597HVN-3.3/NOPB?
The LM2597HVN-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 direct use in 48-V systems, including those subject to ISO 7637-2 load-dump transients. Operation above 40 V requires the HV variant - the LM2597HVN-3.3/NOPB is explicitly rated for this extended range.
Does the LM2597HVN-3.3/NOPB require external compensation components?
No, the LM2597HVN-3.3/NOPB includes internal frequency compensation, eliminating the need for external compensation networks. This is stated in the Description section and verified in the Functional Block Diagram (Section 8.2). The device is optimized for stability with standard external components - a catch diode, inductor, and input/output capacitors - and operates reliably across its full input/output range without additional loop compensation.
Can the LM2597HVN-3.3/NOPB be used in an inverting (positive-to-negative) configuration?
Yes, the LM2597HVN-3.3/NOPB can be configured as a positive-to-negative converter, as documented in Section 8.3.3 and Figure 24 of the datasheet. In this topology, the GND pin is bootstrapped to the negative output, and the FB pin is grounded to sense the inverted voltage. The LM2597HVN-3.3/NOPB's 60-V rating supports higher input-to-output differential voltages in this mode - critical since the total voltage across the IC equals |VIN| + |VOUT|.
What is the purpose of the VBS (Bias Supply) pin on the LM2597HVN-3.3/NOPB?
The VBS pin on the LM2597HVN-3.3/NOPB allows internal circuitry to be powered from the regulated output (e.g., 3.3 V) rather than the high input voltage - reducing power dissipation and improving efficiency, especially at high VIN/low VOUT conditions. As detailed in Section 8.3.1, connecting VBS to VOUT lowers junction temperature and boosts efficiency by up to 5% under light loads. Note: VBS requires ≥4 V to operate, so it cannot be used with the 3.3-V version unless an auxiliary bias source is provided.
How does the error flag (FLAG) pin function on the LM2597HVN-3.3/NOPB?
The FLAG pin on the LM2597HVN-3.3/NOPB is an open-collector output that pulls low when the regulated output falls more than 5% below nominal (i.e., below 3.135 V for LM2597HVN-3.3/NOPB). Per Section 6 and Figure 21, it remains low during startup until VOUT reaches 95% of nominal and the DELAY capacitor times out. This pin is commonly used to drive microcontroller reset inputs or system-level power-good indicators - providing deterministic fault signaling without external comparators.
LM2597HVN-3.3/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):
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM2597HVN-3.3/NOPB FAQ
1.How can I place an order for LM2597HVN-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2597HVN-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 LM2597HVN-3.3/NOPB reliable?
The price and inventory of LM2597HVN-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 LM2597HVN-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2597HVN-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2597HVN-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2597HVN-3.3/NOPB?
LM2597HVN-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2597HVN-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 LM2597HVN-3.3/NOPB?
For technical support, including LM2597HVN-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2597HVN-3.3/NOPB requirements.
6.How does Aetrix verify that LM2597HVN-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2597HVN-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 LM2597HVN-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2597HVN-3.3/NOPB?
All LM2597HVN-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2597HVN-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 LM2597HVN-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2597HVN-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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