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Texas Instruments LM2597N-5.0
- Part No.:
- LM2597N-5.0
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2597N-5.0.pdf
- Description:
- IC REG BUCK 5V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,039
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Product details
Overview
LM2597N-5.0 from Texas Instruments is a monolithic 150-kHz nonsynchronous step-down (buck) DC-DC converter delivering 0.5-A output current with fixed 5-V output, ±4% output voltage tolerance over line and load, input voltage range up to 40 V, and integrated shutdown/soft-start and error flag functions. It serves as an efficient on-card switching regulator in industrial power supplies and embedded systems requiring stable mid-power conversion.
For engineers reviewing the LM2597N-5.0 datasheet, LM2597N-5.0 pinout, LM2597N-5.0 application, or LM2597N-5.0 equivalent, key selection criteria include its 8-pin PDIP package, 150-kHz fixed-frequency operation, bias supply (VBS) pin for efficiency optimization at high VIN/low VOUT, thermal shutdown protection, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2597N-5.0 implements a current-mode control architecture with internal frequency compensation and a fixed 150-kHz oscillator, enabling predictable loop stability and reduced external component count. Its nonsynchronous buck topology uses an internal NPN switch with 1.1-V typical saturation voltage at 0.5-A load, requiring an external catch diode.
It integrates supervisory features including an open-collector error flag that asserts low when output drops >5% below nominal, a delay pin for controlled flag assertion timing, and a dual-function shutdown/soft-start pin supporting logic-level disable (ISTBY = 85 μA typical) and capacitor-controlled ramp-up. The bias supply (VBS) pin allows powering internal circuitry from VOUT instead of VIN-improving efficiency by reducing quiescent current draw from high-input rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over full line/load/temperature range - ensures stable microcontroller or analog rail without external feedback resistors. |
| Max Output Current | 0.5 A DC - supports moderate-power loads such as FPGA I/O banks, sensor signal chains, or isolated gate drivers. |
| Input Voltage Range | 4.5 V to 40 V - accommodates wide-input industrial 24-V systems and automotive-derived 12-V/24-V supplies. |
| Switching Frequency | 150 kHz (±15%) - enables use of compact, low-cost 10–100 μH inductors and reduces EMI compared to lower-frequency alternatives. |
| Efficiency | 82% typical at VIN = 12 V, IOUT = 0.5 A - minimizes thermal stress on PCB copper traces, eliminating need for dedicated heatsinks. |
| Standby Quiescent Current | 85 μA typical - extends battery life in always-on monitoring nodes or low-power wake-up circuits. |
| Thermal Protection | Internal thermal shutdown - prevents damage during overload or poor airflow conditions without external sensing circuitry. |
Pinout & Package
LM2597N-5.0 is supplied in an 8-pin plastic dual in-line package (PDIP), body size 9.81 mm × 6.35 mm, with through-hole mounting and industry-standard lead pitch (0.300 inch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Error Flag | Open-collector output | Asserts low when VOUT falls >5% below 5 V; used for MCU reset or system fault indication with external pull-up. |
| 2 - Delay | Capacitor-connected timing node | Sets delay between VOUT reaching 95% and Error Flag deassertion - prevents premature system enable during startup. |
| 3 - Bias Supply (VBS) | Power input for internal circuitry | Accepts 3.5–30 V; connecting to VOUT reduces VIN current draw and improves efficiency at high VIN/low VOUT conditions. |
| 4 - Feedback | Regulation sense input | Internally tied to 5-V reference; not connected externally in fixed-output versions - simplifies design and eliminates resistor errors. |
| 5 - Shutdown/Soft-Start | Dual-function control input | Pulled low disables switching (ISTBY ≈ 85 μA); capacitor added enables controlled VOUT ramp-up to limit inrush current. |
| 6 - Ground | Power and signal reference | Common return for internal switch, error amplifier, and logic - requires low-impedance connection to minimize noise coupling. |
| 7 - +VIN | Main power input | Accepts 4.5–40 V; requires local ceramic bypass capacitor (≥100 nF) to handle high-frequency switching currents. |
| 8 - Output | Internal NPN switch collector | Switches between (VIN − VSAT) and ~−0.5 V; connects to external diode/anode and inductor - layout must minimize trace area to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5-V output with ±4% tolerance | Eliminates external feedback network, reducing BOM count and layout sensitivity while guaranteeing compliance with 5-V logic and analog supply requirements. |
| Integrated shutdown/soft-start | Enables system-level power sequencing via logic-level control and prevents input supply sag during cold start using a single capacitor. |
| Bias supply (VBS) pin | Allows internal circuitry to be powered from regulated 5-V output instead of raw input - cuts VIN current by ~4 mA at high VIN, improving full-load efficiency by 2–3%. |
| Out-of-regulation error flag with delay | Provides fail-safe reset signaling to microcontrollers with programmable startup delay - avoids false resets due to transient dips during load transients. |
| Thermal shutdown and current limiting | Two-stage current limit (0.65–1.3 A peak) plus junction temperature cutoff at 150°C - protects against short-circuit, overload, and inadequate heatsinking without external components. |
Applications
| Industrial Power Supply | Embedded System Pre-regulator |
|---|---|
Use Scenario: Converting unregulated 24-V DC field bus to clean 5-V rail for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, stabilized 5-V power with built-in fault reporting. Use Value: ±4% output tolerance and thermal shutdown ensure reliable operation in ambient temperatures up to 125°C without derating. |
Use Scenario: Generating 5-V intermediate rail from 12-V main supply to feed low-noise LDOs for ADCs and RF front-ends. IC Role / Device Role / Timing Role: Efficient preregulator reducing voltage differential across downstream linear regulators. Use Value: 82% efficiency at 12-V input minimizes heat generation, allowing dense board layouts without forced air cooling. |
| On-Card Buck Converter | Positive-to-Negative Inverter |
Use Scenario: Local 5-V generation on high-speed digital boards where centralized 5-V distribution causes IR drop and noise. IC Role / Device Role / Timing Role: Point-of-load (POL) buck converter with 150-kHz switching enabling compact LC filter design. Use Value: Fixed-frequency operation simplifies EMI filtering; PDIP package supports manual rework and prototyping flexibility. |
Use Scenario: Generating –5-V rail from +12-V supply for op-amp biasing or RS-232 level shifting in mixed-signal systems. IC Role / Device Role / Timing Role: Inverting buck-boost topology using LM2597N-5.0's internal switch and external diode/capacitor. Use Value: Verified in TI Application Note SNVA003 - supports up to 200-mA –5-V output with standard 100-μH inductor and Schottky diode. |
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, but 150-kHz frequency and 3-A rating; larger SO-8 package; no VBS pin or error flag. | Lacks supervisory features (error flag, delay, soft-start) - suitable only where basic regulation suffices and higher current is needed. | Select LM2596-5.0 if output current >0.5 A is required and fault signaling is unnecessary. |
| TPS54302DDCR | 5-V fixed output, 3-MHz switching, 3-A capability, integrated MOSFETs, and enable/PG pins - but requires external compensation and smaller 6-pin SOT-23 package. | Higher frequency enables ultra-compact designs but increases sensitivity to layout and component parasitics. | Select TPS54302DDCR for space-constrained applications needing >0.5 A and fast transient response, accepting greater design complexity. |
Compared with LM2596-5.0 and TPS54302DDCR, the LM2597N-5.0 uniquely balances simplicity (no compensation needed), robust supervision (error flag + delay), and proven reliability in industrial environments - making it optimal for cost-sensitive, medium-current, and safety-aware 5-V buck applications where PDIP assembly or legacy compatibility matters.
Availability
LM2597N-5.0 is available at Aetrix Electronics and suitable for industrial power supplies, embedded system pre-regulators, and on-card switching regulators requiring stable component supply and long-term manufacturability.
Supply support for LM2597N-5.0 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 LM2597 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for ease-of-use in non-isolated DC-DC buck applications where minimal external components, predictable performance, and rugged operation across harsh environments are essential.
FAQ
What is the maximum input voltage rating for the LM2597N-5.0?
The LM2597N-5.0 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, even briefly. For applications requiring up to 60 V input, the LM2597HV-5.0 must be used instead - the LM2597N-5.0 is not rated for such voltages.
Does the LM2597N-5.0 require external feedback resistors to set the 5-V output?
No, the LM2597N-5.0 does not require external feedback resistors. It is a fixed-output variant with the 5-V reference internally trimmed and connected - pin 4 (Feedback) is unused and left unconnected. This eliminates resistor tolerance errors and simplifies layout, distinguishing it from the adjustable LM2597MX-ADJ version which requires two external resistors.
Can the LM2597N-5.0 be used in a negative-output (inverting) configuration?
Yes, the LM2597N-5.0 supports positive-to-negative conversion per TI Application Note SNVA003. By bootstrapping the ground pin to the negative output and grounding the feedback pin, it regulates –5 V. This requires an external diode (e.g., Schottky) and specific inductor/capacitor values - the LM2597N-5.0 itself remains unchanged, but the external circuit topology differs significantly from standard buck operation.
What is the purpose of the Bias Supply (VBS) pin on the LM2597N-5.0?
The Bias Supply (VBS) pin on the LM2597N-5.0 allows internal circuitry to be powered from the regulated 5-V output instead of the raw input voltage. When connected to VOUT, it reduces VIN current draw by ~4 mA - improving efficiency by 2–3% under high-input/low-output conditions (e.g., 24-V input → 5-V output), especially at light loads. It is not used in the default configuration but offers measurable thermal and efficiency benefits when implemented.
Is the LM2597N-5.0 RoHS compliant and lead-free?
Yes, the LM2597N-5.0 is RoHS compliant and lead-free, as confirmed in Texas Instruments' official packaging and environmental documentation (SLMA001). The PDIP package uses matte tin lead finish, and the device meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1 - indicating unlimited floor life at ≤30°C/85% RH. Full compliance data is available in TI's Quality & Environmental Information portal.
LM2597N-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM2597N-5.0 FAQ
1.How can I place an order for LM2597N-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2597N-5.0 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 LM2597N-5.0 reliable?
The price and inventory of LM2597N-5.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2597N-5.0 is usually 5 days.
3.What payment methods are accepted for LM2597N-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2597N-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2597N-5.0?
LM2597N-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2597N-5.0 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 LM2597N-5.0?
For technical support, including LM2597N-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2597N-5.0 requirements.
6.How does Aetrix verify that LM2597N-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2597N-5.0 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 LM2597N-5.0 meets industry standards.
7.What is the process for return or replacement of LM2597N-5.0?
All LM2597N-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2597N-5.0, 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 LM2597N-5.0 part is unused and in its original packaging.
Return procedure for LM2597N-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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