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

Texas Instruments LM2597M-5.0/NOPB

Name: LM2597M-5.0/NOPB
Brand: Texas Instruments
SKU: LM2597M-5.0/NOPB
Price: 2.40 USD
Availability: InStock
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Part No.:: LM2597M-5.0/NOPB

Manufacturer:: Texas Instruments

Category:: Voltage Regulators - DC DC Switching Regulators

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

Datasheet:: LM2597M-5.0/NOPB.pdf

Description:: IC REG BUCK 5V 500MA 8SOIC

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Product details

Overview

LM2597M-5.0/NOPB from Texas Instruments is a monolithic 150-kHz nonsynchronous step-down DC-DC converter delivering up to 0.5 A at fixed 5 V output, with ±4% output voltage tolerance over line and load, input voltage range up to 40 V, and 82% typical efficiency at 12 V_IN/0.5 A. It serves as an efficient buck regulator in industrial power supplies and embedded system rails.

For engineers reviewing the LM2597M-5.0/NOPB datasheet, LM2597M-5.0/NOPB pinout, LM2597M-5.0/NOPB application, or LM2597M-5.0/NOPB equivalent, key selection criteria include its fixed 5-V output, 8-pin SOIC package, integrated soft-start/shutdown control, error flag with delay, and bias supply (VBS) pin for improved high-input-voltage efficiency.

Technical Context

The LM2597M-5.0/NOPB implements a current-mode PWM controller with a fixed 150-kHz internal oscillator, enabling compact external filter design. Its nonsynchronous buck topology uses an internal N-channel MOSFET switch with 0.9–1.2 V saturation voltage and dual-stage current limiting (0.58–1.4 A peak).

It integrates supervisory functions including an open-collector error flag triggered when output drops >5%, a programmable delay pin for power-up sequencing, and a shutdown/soft-start pin supporting both logic-level disable (85 μA standby) and capacitor-controlled ramp-up. The bias supply (VBS) pin allows powering internal circuitry from V_OUT, reducing dissipation at high VIN/low VOUT conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 5.0 V ±4% over full line/load/temperature range - ensures stable rail without external feedback resistors.
Max Output Current	0.5 A DC - supports mid-power microcontroller, sensor, or interface IC rails without external current boosting.
Input Voltage Range	4.5 V to 40 V - accommodates wide-input industrial, automotive, or telecom-derived supplies.
Switching Frequency	150 kHz (±15%) - enables use of low-cost, standard inductors and reduces EMI compared to higher-frequency alternatives.
Efficiency	82% typical at 12 V_IN/5 V_OUT/0.5 A - minimizes thermal stress; PCB copper traces suffice as heat sink under normal operation.
Quiescent Current	5–10 mA operating; 85 μA in shutdown - supports low-power standby modes in battery-backed or energy-conscious systems.
Thermal Resistance	95 °C/W (SOIC-8) - defines junction-to-ambient rise per watt; requires minimal copper area for thermal management.

Pinout & Package

LM2597M-5.0/NOPB is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, optimized for surface-mount assembly and thermal performance on standard PCBs.

Pin/Terminal	Circuit Role	Design Meaning
1 (Error_Flag)	Open-collector fault indicator	Asserts low when V_OUT falls >5% below nominal; used for MCU reset or system monitoring with external pull-up.
2 (Delay)	Capacitor-programmable timing node	Sets delay between V_OUT reaching 95% and Error_Flag deassertion - enables controlled power-up sequencing.
3 (Bias_Supply)	Internal circuit power source	Accepts V_OUT (≥4 V) to reduce VIN current draw and improve efficiency at high input voltages.
4 (Feedback)	Regulation reference input	Internally tied to 5 V output; not user-accessible - eliminates external resistor network for fixed-version stability.
5 (Shutdown/Soft-Start)	Dual-function control input	Logic-low disables switching (85 μA IQ); capacitor adds soft-start ramp to limit inrush current during turn-on.
6 (Ground)	Power and signal reference	Common return for internal switch, control circuitry, and external components - must be low-impedance PCB plane.
7 (+VIN)	Main power input	Accepts 4.5–40 V; requires local ceramic bypass capacitor to handle high di/dt switching currents.
8 (Output)	Internal switch drain	Swings between (VIN − V_SAT) and ≈−0.5 V; connects to external catch diode and inductor - minimize trace area to reduce EMI.

Key Features

Feature	Design Value
Integrated Soft-Start & Shutdown	Single-pin dual function enables controlled power-up ramp and <85 μA standby current - simplifies system power sequencing and extends battery life.
Bias Supply (VBS) Pin	Allows internal circuitry to be powered from regulated output instead of VIN - improves efficiency by ~3–5% at high VIN/low VOUT conditions.
Out-of-Regulation Error Flag	Open-drain output with built-in 5% dropout threshold and programmable delay - provides reliable power-good signaling without external comparators.
Thermal & Current Protection	Two-stage current limit (0.58–1.4 A) plus thermal shutdown - prevents damage during overload, short-circuit, or poor heatsinking scenarios.
Fixed-Frequency PWM Control	150-kHz oscillator with internal compensation - eliminates need for external frequency-setting components and simplifies EMI filtering.

Applications

Industrial Power Rails	Automotive Subsystem Supplies
Use Scenario: Providing clean 5 V for PLC I/O modules, motor drivers, or fieldbus transceivers in 24 V DC-powered factory equipment. IC Role / Device Role / Timing Role: Primary buck regulator converting unregulated 24 V bus to stable 5 V logic rail with high line regulation (±0.2%) and 0.5 A capability. Use Value: Eliminates need for discrete controller + MOSFET + compensation network - reduces BOM count and layout complexity while maintaining ±4% output accuracy across temperature.	Use Scenario: Generating 5 V for infotainment head units, body control modules, or ADAS sensors from vehicle battery (9–16 V) or alternator (up to 40 V transient). IC Role / Device Role / Timing Role: Nonsynchronous buck converter with 40 V absolute max input rating and thermal shutdown - handles load dump and cold-crank conditions safely. Use Value: 82% efficiency at 12 V_IN/5 V_OUT minimizes heat buildup in sealed enclosures; error flag supports fail-safe MCU reset during brownout.
Embedded System Pre-regulator	Positive-to-Negative Converter
Use Scenario: Pre-stepping down 24 V or 36 V intermediate bus to 5 V before linear regulation for noise-sensitive analog circuits or ADC references. IC Role / Device Role / Timing Role: High-efficiency preregulator reducing power loss ahead of low-noise LDOs - operates at fixed 150 kHz for predictable EMI placement. Use Value: Reduces total dissipation vs. single-stage linear solution; soft-start prevents inrush into downstream LDO input capacitance.	Use Scenario: Generating –5 V from +12 V for op-amp biasing, RS-232 level shifting, or sensor signal conditioning in mixed-signal instrumentation. IC Role / Device Role / Timing Role: Inverting buck-boost topology using LM2597M-5.0/NOPB's ground-referenced feedback and internal switch - no external controller required. Use Value: Enables bipolar supply generation with only one IC, two diodes, one inductor, and two capacitors - avoids cost and footprint of dedicated inverting controllers.

Industrial Power Rails

Automotive Subsystem Supplies

Use Scenario: Providing clean 5 V for PLC I/O modules, motor drivers, or fieldbus transceivers in 24 V DC-powered factory equipment.

IC Role / Device Role / Timing Role: Primary buck regulator converting unregulated 24 V bus to stable 5 V logic rail with high line regulation (±0.2%) and 0.5 A capability.

Use Value: Eliminates need for discrete controller + MOSFET + compensation network - reduces BOM count and layout complexity while maintaining ±4% output accuracy across temperature.

Use Scenario: Generating 5 V for infotainment head units, body control modules, or ADAS sensors from vehicle battery (9–16 V) or alternator (up to 40 V transient).

IC Role / Device Role / Timing Role: Nonsynchronous buck converter with 40 V absolute max input rating and thermal shutdown - handles load dump and cold-crank conditions safely.

Use Value: 82% efficiency at 12 V_IN/5 V_OUT minimizes heat buildup in sealed enclosures; error flag supports fail-safe MCU reset during brownout.

Embedded System Pre-regulator

Positive-to-Negative Converter

Use Scenario: Pre-stepping down 24 V or 36 V intermediate bus to 5 V before linear regulation for noise-sensitive analog circuits or ADC references.

IC Role / Device Role / Timing Role: High-efficiency preregulator reducing power loss ahead of low-noise LDOs - operates at fixed 150 kHz for predictable EMI placement.

Use Value: Reduces total dissipation vs. single-stage linear solution; soft-start prevents inrush into downstream LDO input capacitance.

Use Scenario: Generating –5 V from +12 V for op-amp biasing, RS-232 level shifting, or sensor signal conditioning in mixed-signal instrumentation.

IC Role / Device Role / Timing Role: Inverting buck-boost topology using LM2597M-5.0/NOPB's ground-referenced feedback and internal switch - no external controller required.

Use Value: Enables bipolar supply generation with only one IC, two diodes, one inductor, and two capacitors - avoids cost and footprint of dedicated inverting controllers.

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM2596-5.0	Same 5 V fixed output, 3 A rating, 150 kHz, but larger SOIC-8 package (6.2 mm × 4.9 mm); higher current capability and slightly lower efficiency (79% typ).	Preferred where >0.5 A load current is needed; less suitable for space-constrained layouts due to larger footprint.	Select LM2596-5.0 only if output current exceeds 0.5 A; otherwise LM2597M-5.0/NOPB offers better size-efficiency balance.
TPS54302DDCR	5 V fixed output, 3 A, 2.5–18 V input, 500 kHz switching, integrated high-side FET, but requires external compensation and has no error flag or VBS pin.	Used in compact, high-density designs needing higher efficiency at light loads; lacks built-in supervision features for safety-critical sequencing.	Choose TPS54302DDCR for higher switching frequency and smaller magnetics; retain LM2597M-5.0/NOPB when error flag, soft-start, and bias supply are required for robustness.

Compared with LM2596-5.0 and TPS54302DDCR, LM2597M-5.0/NOPB uniquely combines fixed 5 V output, integrated error flag with delay, bias supply for efficiency optimization, and proven 0.5 A capability in a compact SOIC-8 - making it optimal for cost-sensitive, reliability-focused industrial and automotive subsystems where supervision and simplicity outweigh raw current or frequency specs.

Availability

LM2597M-5.0/NOPB is available at Aetrix Electronics and suitable for industrial power rails, automotive subsystem supplies, and embedded system pre-regulators requiring stable component supply, long-term lifecycle support, and TI-qualified manufacturing traceability.

Supply support for LM2597M-5.0/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 designing analog, embedded processing, and digital signal solutions for industrial, automotive, and communications markets.

The LM2597 series belongs to TI's SIMPLE SWITCHER® power converter family, engineered for ease-of-use in non-isolated DC-DC buck applications where minimal external components, integrated protection, and fixed-output simplicity are prioritized over ultra-high efficiency or ultra-small size.

FAQ

What is the maximum input voltage rating for LM2597M-5.0/NOPB?

The LM2597M-5.0/NOPB has a maximum input voltage rating of 40 V, as specified in the Absolute Maximum Ratings table. This applies to the standard LM2597 variant (not the HV version). Operation above 40 V risks permanent damage. The recommended operating range is 4.5 V to 40 V, ensuring reliable regulation and thermal performance within datasheet limits.

Does LM2597M-5.0/NOPB require external feedback resistors to set the 5 V output?

No, LM2597M-5.0/NOPB does not require external feedback resistors. It is a fixed-output version with internal feedback network trimmed to 5.0 V ±4%. Pin 4 (Feedback) is internally connected to the output divider and is not accessible for adjustment - eliminating resistor selection, placement, and tolerance errors common in adjustable regulators.

Can LM2597M-5.0/NOPB be used in an inverting (positive-to-negative) configuration?

Yes, LM2597M-5.0/NOPB can be configured as a positive-to-negative converter by bootstrapping the ground pin to the negative output and grounding the feedback pin. The datasheet confirms this topology in Figure 24, generating –5 V from +12 V. However, startup current may reach 0.8 A briefly, so soft-start is recommended to manage inrush.

What is the purpose of the Bias Supply (VBS) pin on LM2597M-5.0/NOPB?

The Bias Supply (VBS) pin on LM2597M-5.0/NOPB allows internal circuitry to be powered from the regulated output (≥4 V) instead of VIN. This reduces input current draw and improves efficiency - especially at high VIN/low VOUT conditions - by lowering junction temperature and conduction losses. For the 5 V version, connecting VBS to VOUT yields measurable efficiency gains.

How does the Error_Flag pin behave during startup of LM2597M-5.0/NOPB?

During startup, the Error_Flag pin on LM2597M-5.0/NOPB remains low until VOUT reaches 95% of 5 V (i.e., 4.75 V), then stays low for a delay time set by the capacitor on the Delay pin before going high. This provides a clean, debounced power-good signal usable for MCU reset or system enable sequencing without external timers.

LM2597M-5.0/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:: Fixed

Number of Outputs:: 1

Voltage - Input (Min):: 4.5V

Voltage - Input (Max):: 40V

Voltage - Output (Min/Fixed):: 5V

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

LM2597M-5.0/NOPB FAQ

1.How can I place an order for LM2597M-5.0/NOPB through Aetrix?

Please submit a Request for Quotation (RFQ) for LM2597M-5.0/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 LM2597M-5.0/NOPB reliable?

The price and inventory of LM2597M-5.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2597M-5.0/NOPB is usually 5 days.

3.What payment methods are accepted for LM2597M-5.0/NOPB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2597M-5.0/NOPB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM2597M-5.0/NOPB?

LM2597M-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM2597M-5.0/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 LM2597M-5.0/NOPB?

For technical support, including LM2597M-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2597M-5.0/NOPB requirements.

6.How does Aetrix verify that LM2597M-5.0/NOPB is sourced from the original manufacturer or authorized distributors?

All LM2597M-5.0/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 LM2597M-5.0/NOPB meets industry standards.

7.What is the process for return or replacement of LM2597M-5.0/NOPB?

All LM2597M-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2597M-5.0/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 LM2597M-5.0/NOPB part is unused and in its original packaging.

Return procedure for LM2597M-5.0/NOPB:

1.Submit a request within 90 days.

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

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