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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Texas Instruments LM2597HVM-ADJ/NOPB

Name: LM2597HVM-ADJ/NOPB
Brand: Texas Instruments
SKU: LM2597HVM-ADJ/NOPB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM2597HVM-ADJ/NOPB

Manufacturer:: Texas Instruments

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: LM2597HVM-ADJ/NOPB.pdf

Description:: IC REG BUCK ADJ 500MA 8SOIC

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Product details

Overview

LM2597HVM-ADJ/NOPB from Texas Instruments is a monolithic nonsynchronous step-down (buck) DC-DC converter IC designed for high-input-voltage industrial and automotive power supplies. It delivers 0.5-A output current with ±4% output voltage accuracy, supports 1.2 V to 37 V adjustable output range, operates at fixed 150-kHz switching frequency, and accepts input voltages up to 60 V - enabling use as a primary regulator in 24-V or 48-V systems.

For engineers reviewing the LM2597HVM-ADJ/NOPB datasheet, LM2597HVM-ADJ/NOPB pinout, LM2597HVM-ADJ/NOPB application, or LM2597HVM-ADJ/NOPB equivalent, key selection criteria include its HV-rated input capability, integrated soft-start/shutdown control, error flag with delay timing, bias supply (VBS) pin for efficiency optimization at high VIN/low VOUT, and thermal shutdown with current limiting.

Technical Context

The LM2597HVM-ADJ/NOPB implements a current-mode controlled buck topology with internal 150-kHz oscillator, fixed-frequency PWM operation, and built-in two-stage current limit protection. Its feedback loop senses output voltage via the 1.23-V reference at the FB pin, enabling precise regulation across line and load variations.

It features dedicated functional pins for system-level integration: an open-collector Error_Flag output with programmable delay, a dual-function Shutdown/Soft-Start pin supporting logic-level disable and capacitor-controlled ramp-up, and a Bias_Supply (VBS) pin that powers internal circuitry from VOUT instead of VIN - reducing power dissipation and improving efficiency under high-input, low-output conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5 V to 60 V - supports wide-range industrial inputs including 24-V, 36-V, and 48-V rails without external pre-regulation.
Output Current	0.5 A continuous - sufficient for powering microcontrollers, sensors, and analog circuitry in embedded systems.
Output Voltage Range	1.2 V to 37 V (adjustable) - set externally via resistor divider; enables flexible rail generation from single HV source.
Feedback Reference Voltage	1.23 V ±2% - defines regulation point; used with external resistors to scale output voltage precisely.
Switching Frequency	150 kHz (±15%) - enables use of compact, low-cost off-the-shelf inductors and reduces EMI compared to lower-frequency alternatives.
Standby Quiescent Current	140 μA typical (LM2597HV) - ensures minimal power draw during shutdown, critical for battery-backed or always-on systems.
Efficiency	80% typical at 12-V_IN/3-V_OUT/0.5-A - achieved using internal switch with 1.1-V saturation voltage and optimized gate drive.

Pinout & Package

LM2597HVM-ADJ/NOPB is packaged in an 8-pin SOIC (D package), 4.90 mm × 3.91 mm body size, surface-mount format suitable for automated assembly and thermally constrained layouts.

Pin/Terminal	Circuit Role	Design Meaning
1 - Error_Flag	Open-collector output	Asserts low when VOUT drops >5%; used for MCU reset or fault signaling; requires pull-up resistor.
2 - Delay	Capacitor-connected timing node	Sets delay between VOUT reaching 95% and Error_Flag deassertion; enables sequenced power-up.
3 - Bias_Supply (VBS)	Power input for internal circuitry	Accepts 3.5–30 V; improves efficiency by powering control logic from VOUT instead of VIN at high input voltages.
4 - Feedback (FB)	Inverting input of error amplifier	Senses divided output voltage; regulates VOUT = 1.23 V × (1 + R1/R2); bias current ≤50 nA minimizes divider error.
5 - Shutdown/Soft-Start (SD/SS)	Dual-function digital/analog input	Logic-low disables regulator (I_Q ≈ 140 μA); capacitor adds controlled VOUT ramp to limit inrush current.
6 - Ground	Power and signal reference	Common return path for internal switch, error amplifier, and bias circuitry; must be low-impedance PCB plane.
7 - +VIN	Main power input	Accepts 4.5–60 V; requires local ceramic bypass capacitor to handle high di/dt switching currents.
8 - Output	Internal N-channel DMOS switch drain	Switches between VIN−V_SAT and ~−0.5 V; connects to external catch diode and inductor; layout critical for EMI control.

Key Features

Feature	Design Value
High-Voltage Input Support	60-V absolute maximum rating enables direct regulation from 48-V industrial buses or automotive transients without external TVS or pre-regulators.
Integrated Soft-Start	Capacitor-programmable output voltage ramp prevents inrush current surges and stabilizes upstream supplies during power-up.
Programmable Error Flag Delay	Delay pin allows configurable hold-off time before error flag release, supporting reliable power sequencing in multi-rail systems.
Bias Supply (VBS) Pin	Reduces total power loss by powering internal logic from regulated output - especially beneficial at VIN > 24 V and VOUT < 12 V.
Comprehensive Protection	Includes thermal shutdown, peak current limiting (0.8-A typical), and undervoltage lockout via SD/SS pin - no external supervision needed.

Applications

Industrial 24-V Power Distribution	Automotive Body Control Module (BCM)
Use Scenario: Converting 24-V vehicle battery or factory bus to 3.3-V or 5-V for microcontroller, CAN transceiver, and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing stable, efficient, and protected DC-DC conversion with transient tolerance up to 60 V. Use Value: Eliminates need for discrete pre-regulator stages; 150-kHz switching allows small magnetics; soft-start prevents fuse blowing during cold-crank events.	Use Scenario: Generating isolated 5-V and 3.3-V rails in door modules, seat controllers, or lighting ECUs where space and thermal budget are limited. IC Role / Device Role / Timing Role: Compact, self-contained step-down regulator with integrated protection and sequencing support. Use Value: VBS pin improves efficiency at 24-V input/3.3-V output (≈80%), reducing board temperature rise; Error_Flag provides diagnostic feedback to main ECU.
Programmable Sensor Signal Conditioning	Positive-to-Negative Converter
Use Scenario: Powering precision op-amps, ADCs, and analog front-ends requiring user-adjustable supply voltages (e.g., ±5 V, ±12 V) from a single 24-V source. IC Role / Device Role / Timing Role: Adjustable-output buck controller enabling flexible analog rail generation with tight regulation. Use Value: 1.23-V reference and low FB bias current (<50 nA) ensure accurate output setting; ±4% tolerance maintains signal chain accuracy across temperature.	Use Scenario: Generating −5-V or −12-V from a positive 12-V or 24-V supply for op-amp biasing or RS-232 interface circuits. IC Role / Device Role / Timing Role: Configured in inverting topology using external diode and inductor to produce negative output with common ground. Use Value: Leverages same IC die and pinout; supports regulated negative outputs without dedicated inverting ICs; soft-start mitigates high startup current in inverting mode.

Industrial 24-V Power Distribution

Automotive Body Control Module (BCM)

Use Scenario: Converting 24-V vehicle battery or factory bus to 3.3-V or 5-V for microcontroller, CAN transceiver, and sensor interfaces.

IC Role / Device Role / Timing Role: Primary buck regulator providing stable, efficient, and protected DC-DC conversion with transient tolerance up to 60 V.

Use Value: Eliminates need for discrete pre-regulator stages; 150-kHz switching allows small magnetics; soft-start prevents fuse blowing during cold-crank events.

Use Scenario: Generating isolated 5-V and 3.3-V rails in door modules, seat controllers, or lighting ECUs where space and thermal budget are limited.

IC Role / Device Role / Timing Role: Compact, self-contained step-down regulator with integrated protection and sequencing support.

Use Value: VBS pin improves efficiency at 24-V input/3.3-V output (≈80%), reducing board temperature rise; Error_Flag provides diagnostic feedback to main ECU.

Programmable Sensor Signal Conditioning

Positive-to-Negative Converter

Use Scenario: Powering precision op-amps, ADCs, and analog front-ends requiring user-adjustable supply voltages (e.g., ±5 V, ±12 V) from a single 24-V source.

IC Role / Device Role / Timing Role: Adjustable-output buck controller enabling flexible analog rail generation with tight regulation.

Use Value: 1.23-V reference and low FB bias current (<50 nA) ensure accurate output setting; ±4% tolerance maintains signal chain accuracy across temperature.

Use Scenario: Generating −5-V or −12-V from a positive 12-V or 24-V supply for op-amp biasing or RS-232 interface circuits.

IC Role / Device Role / Timing Role: Configured in inverting topology using external diode and inductor to produce negative output with common ground.

Use Value: Leverages same IC die and pinout; supports regulated negative outputs without dedicated inverting ICs; soft-start mitigates high startup current in inverting 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
LM2596HV-ADJ/NOPB	Higher 3-A output current, 150-kHz frequency, but larger SOIC-8 footprint and higher quiescent current (5-mA operating vs. 10-mA).	Preferred for higher-current loads (>0.5 A); less suitable for ultra-low-power standby due to higher IQ.	Select LM2596HV-ADJ/NOPB only when ≥1-A output is required; LM2597HVM-ADJ/NOPB remains optimal for cost-sensitive, thermally constrained 0.5-A designs.
TPS54302DDAR	3-A synchronous buck with 2.5-V to 28-V input, 500-kHz switching, and integrated high-side/low-side FETs - no external diode needed.	Offers higher efficiency and smaller solution size but requires more complex compensation and lacks HV input rating (max 28 V).	Choose TPS54302DDAR for 12-V input systems needing >90% efficiency and minimal BOM count; LM2597HVM-ADJ/NOPB retains advantage for 48-V input or legacy design reuse.

Compared with LM2596HV-ADJ/NOPB and TPS54302DDAR, LM2597HVM-ADJ/NOPB uniquely balances 60-V input capability, 0.5-A output, SOIC-8 simplicity, and proven reliability in harsh environments - making it the preferred choice for industrial and automotive buck regulation where voltage range and robustness outweigh peak efficiency demands.

Availability

LM2597HVM-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for LM2597HVM-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 experience in high-reliability power conversion ICs.

The LM2597HV product line was engineered specifically for high-input-voltage DC-DC conversion in industrial, automotive, and telecom infrastructure - emphasizing ruggedness, ease of use, and minimal external component count.

FAQ

What is the maximum input voltage supported by LM2597HVM-ADJ/NOPB?

The LM2597HVM-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 systems or automotive load-dump transients without external clamping.

How does the Bias_Supply (VBS) pin improve efficiency in LM2597HVM-ADJ/NOPB?

The VBS pin on LM2597HVM-ADJ/NOPB allows internal circuitry to be powered from the regulated output instead of VIN, reducing power dissipation - especially beneficial at high input voltages (e.g., 48 V) and low output voltages (e.g., 3.3 V). As shown in Figure 19 and Section 8.3.1, this feature can increase efficiency by 3–5 percentage points and lower junction temperature under those conditions.

Can LM2597HVM-ADJ/NOPB be used in an inverting configuration to generate negative output voltages?

Yes, LM2597HVM-ADJ/NOPB can be configured as a positive-to-negative inverter, as documented in Section 8.3.3 and Figure 24. It requires external diode D1, inductor, and capacitor, with the GND pin referenced to the negative output. The maximum |VIN| + |VOUT| must not exceed 60 V, and soft-start is recommended to manage high startup current inherent to this topology.

What is the purpose of the Delay pin (Pin 2) on LM2597HVM-ADJ/NOPB?

The Delay pin on LM2597HVM-ADJ/NOPB sets the time interval between when the output reaches 95% of nominal voltage and when the Error_Flag pin transitions high. A capacitor connected from this pin to ground determines the delay - enabling controlled power sequencing in multi-rail systems and preventing premature system wake-up before stable regulation is achieved.

Does LM2597HVM-ADJ/NOPB include overtemperature and overcurrent protection?

Yes, LM2597HVM-ADJ/NOPB integrates both thermal shutdown and two-stage current limiting. Section 5 confirms "Thermal Shutdown and Current-Limit Protection" as a core feature, and Section 7.9 specifies peak current limit of 0.8 A typical. These protections operate autonomously without external components, ensuring safe operation during overload or poor heatsinking conditions.

LM2597HVM-ADJ/NOPB Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: SIMPLE SWITCHER®

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

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:: Surface Mount

Supplier Device Package:: 8-SOIC

LM2597HVM-ADJ/NOPB FAQ

1.How can I place an order for LM2597HVM-ADJ/NOPB through Aetrix?

Please submit a Request for Quotation (RFQ) for LM2597HVM-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 LM2597HVM-ADJ/NOPB reliable?

The price and inventory of LM2597HVM-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 LM2597HVM-ADJ/NOPB is usually 5 days.

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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2597HVM-ADJ/NOPB transactions.

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LM2597HVM-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM2597HVM-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 LM2597HVM-ADJ/NOPB?

For technical support, including LM2597HVM-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2597HVM-ADJ/NOPB requirements.

6.How does Aetrix verify that LM2597HVM-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?

All LM2597HVM-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 LM2597HVM-ADJ/NOPB meets industry standards.

7.What is the process for return or replacement of LM2597HVM-ADJ/NOPB?

All LM2597HVM-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2597HVM-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 LM2597HVM-ADJ/NOPB part is unused and in its original packaging.

Return procedure for LM2597HVM-ADJ/NOPB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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