My Inquiry
My Account
Texas Instruments LM2597N-5.0/NOPB
- Part No.:
- LM2597N-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2597N-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:277
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2597N-5.0/NOPB from Texas Instruments is a monolithic 150-kHz nonsynchronous step-down (buck) DC-DC converter delivering up to 0.5 A output current with fixed 5.0 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 - used in industrial power supplies and embedded system point-of-load regulation.
For engineers reviewing the LM2597N-5.0/NOPB datasheet, LM2597N-5.0/NOPB pinout, LM2597N-5.0/NOPB application, or LM2597N-5.0/NOPB equivalent, key selection criteria include its 8-pin PDIP package, 150-kHz fixed-frequency operation enabling compact filter design, bias supply (VBS) pin for efficiency optimization at high VIN/low VOUT, and thermal shutdown with current-limit protection.
Technical Context
The LM2597N-5.0/NOPB implements a nonsynchronous buck topology with internal 150-kHz oscillator, fixed-frequency PWM control, and integrated power switch. It uses external diode, inductor, and capacitors to form a complete switching regulator with no need for external compensation.
Its functional block includes feedback sensing via internal 1.23-V reference, error amplifier, PWM comparator, and driver stage. The Bias Supply (VBS) pin enables powering internal circuitry from VOUT instead of VIN - improving efficiency by reducing quiescent current draw from high-input rails, especially under light loads or 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 microcontroller or logic rail without external resistor divider. |
| Max Output Current | 0.5 A DC - supports moderate-power digital subsystems or analog front-ends without derating. |
| Input Voltage Range | 4.5 V to 40 V - accommodates wide-input industrial or automotive-derived supplies, excluding HV variant. |
| Switching Frequency | 150 kHz (±15%) - enables use of low-cost, standard inductors and reduces EMI compared to higher-frequency alternatives. |
| Quiescent Current | 5–10 mA operating; 85 μA standby - minimizes no-load power loss in battery-backed or always-on systems. |
| Efficiency | 82% typical at 12 VIN/5 VOUT/0.5 A - reduces thermal load on PCB copper traces, eliminating need for dedicated heatsinks. |
| Protection Features | Thermal shutdown, peak current limit (0.65–1.3 A), and undervoltage lockout - ensures robust operation during fault or startup transients. |
Pinout & Package
LM2597N-5.0/NOPB is housed in an 8-pin Plastic Dual In-line Package (PDIP) with body size 9.81 mm × 6.35 mm, through-hole mounting, and industry-standard lead spacing for manual or wave-solder assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Error Flag) | Open-collector output | Asserts low when VOUT drops >5% below nominal - usable as microprocessor reset signal after programmable delay. |
| 2 (Delay) | Capacitor-connected timing node | Sets delay between VOUT reaching 95% and Error Flag going high - enables controlled power-up sequencing. |
| 3 (Bias Supply) | Power input for internal circuitry | Accepts VOUT (≥4 V) to reduce VIN current draw - improves efficiency at high input voltages and light loads. |
| 4 (Feedback) | Inverting input of error amplifier | Internally referenced to 1.23 V - unused in fixed-5.0-V version; tied internally to set output. |
| 5 (Shutdown/Soft-Start) | Dual-function logic input | Logic-low shuts down IC (IQ ≈ 85 μA); capacitor adds soft-start ramp to limit inrush current. |
| 6 (Ground) | Power and signal reference | Common return for internal switch, error amp, and control logic - requires low-impedance PCB connection. |
| 7 (+VIN) | Main power input | Accepts 4.5–40 V DC - requires local ceramic bypass capacitor to handle high-frequency switching currents. |
| 8 (Output) | Internal NPN switch collector | Swings between (VIN − VSAT) and ≈−0.5 V - connects to external catch diode and inductor; minimal copper area recommended. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0-V output | Eliminates external feedback resistors - simplifies BOM, layout, and qualification for cost-sensitive industrial designs. |
| Bias Supply (VBS) pin | Enables powering internal circuitry from regulated output - reduces VIN current by ~4 mA at high input voltages, lowering thermal stress. |
| Integrated shutdown/soft-start | Single-pin dual function allows logic-controlled enable/disable and programmable output voltage ramp - prevents inrush into large output capacitors. |
| Error flag with delay | Open-drain output with user-set delay provides reliable power-good signaling - supports safe microcontroller boot sequencing. |
| Thermal shutdown + current limit | Two-stage protection prevents damage during overload or poor heatsinking - maintains reliability in unventilated enclosures. |
Applications
| Industrial Power Supply | Embedded System PoL |
|---|---|
Use Scenario: Converting 24-V DC factory bus to stable 5-V rail for PLC I/O modules. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated 5-V supply with tight regulation and fault reporting. Use Value: ±4% output tolerance and error flag ensure deterministic behavior under varying load and temperature - critical for analog sensor interfacing. | Use Scenario: Generating 5-V logic supply for ARM-based edge controller with limited board space. IC Role / Device Role / Timing Role: Nonsynchronous buck converter with integrated switch and fixed-frequency control. Use Value: 150-kHz operation allows use of low-profile, off-the-shelf 100-μH inductors - avoids custom magnetics and accelerates prototyping. |
| Preregulator for Linear Regulator | Positive-to-Negative Converter |
Use Scenario: Reducing 36-V automotive-derived input to 7-V intermediate rail before LDO for noise-sensitive ADC. IC Role / Device Role / Timing Role: Efficient preregulator minimizing dropout and heat dissipation in downstream linear regulator. Use Value: 82% efficiency at 12-VIN/5-VOUT cuts power loss by >5× versus direct linear regulation - extends thermal margin. | Use Scenario: Generating –5-V supply from +12-V rail for op-amp bias in instrumentation amplifiers. IC Role / Device Role / Timing Role: Inverting buck-boost topology using LM2597N-5.0/NOPB's ground-referenced feedback and internal switch. Use Value: Fixed 5-V output version simplifies inverting design - eliminates feedback resistor errors and improves output accuracy vs adjustable variants. |
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-5.0/NOPB | Same electrical specs, but in 8-pin SOIC package (4.90 mm × 3.91 mm) - surface-mount, smaller footprint, higher thermal resistance (95°C/W vs 150°C/W). | Preferred for automated SMT assembly and space-constrained PCBs; less suitable for high-ambient-temperature through-hole designs. | Select LM2597MX-5.0/NOPB when board real estate or reflow compatibility is prioritized over manual solderability or thermal margin. |
| LM2594N-5.0 | Legacy 150-kHz buck regulator with identical pinout and 5-V fixed output, but lacks Bias Supply (VBS) pin and has lower efficiency (≈78% typical) and no error flag delay. | Used where legacy compatibility or minimal feature set suffices; not suitable for designs requiring power-good sequencing or efficiency optimization at high VIN. | Choose LM2594N-5.0 only for drop-in replacement in existing LM2594-based designs - avoid for new designs needing VBS or precise power-good timing. |
Compared with LM2597MX-5.0/NOPB, the LM2597N-5.0/NOPB offers superior thermal performance in through-hole layouts but requires larger PCB area; versus LM2594N-5.0, it adds VBS and error flag delay - enabling higher efficiency and safer power sequencing in modern industrial systems.
Availability
LM2597N-5.0/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded system point-of-load regulation, and preregulator applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2597N-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 specializing in analog, embedded processing, and power management technologies, with decades of experience in high-reliability power conversion solutions.
The LM2597 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for ease-of-use in cost-sensitive, medium-power DC-DC applications where minimal external components and proven reliability are essential.
FAQ
What is the maximum input voltage rating for LM2597N-5.0/NOPB?
The LM2597N-5.0/NOPB supports a maximum input voltage of 40 V, as specified in the Absolute Maximum Ratings table. This distinguishes it from the LM2597HV variant, which supports up to 60 V. Exceeding 40 V on the +VIN pin may cause permanent damage to the LM2597N-5.0/NOPB, even briefly. Always include appropriate input transient suppression and verify worst-case supply conditions in the final design.
Does LM2597N-5.0/NOPB require an external feedback resistor network?
No, the LM2597N-5.0/NOPB does not require external feedback resistors because it is a fixed-output version with internal resistor divider set to 5.0 V. Pin 4 (Feedback) is internally connected and must remain unconnected in this variant. Using external resistors would disrupt regulation and is incompatible with the LM2597N-5.0/NOPB's internal architecture - only adjustable versions like LM2597-ADJ require external feedback networks.
Can LM2597N-5.0/NOPB be used in a positive-to-negative inverting configuration?
Yes, the LM2597N-5.0/NOPB can be configured as a positive-to-negative inverter by bootstrapping its ground pin to the negative output and grounding the feedback pin - as documented in TI's application note SNVS119D Figure 24. The fixed 5.0-V output version simplifies this topology by eliminating feedback resistor tolerance errors. However, start-up inrush current is higher than in buck mode, so soft-start capacitance on pin 5 is strongly recommended.
What is the purpose of the Bias Supply (VBS) pin on LM2597N-5.0/NOPB?
On the LM2597N-5.0/NOPB, the Bias Supply (VBS) pin (pin 3) allows internal circuitry to be powered from the regulated 5.0-V output instead of the higher input voltage - reducing VIN current draw by ~4 mA and improving efficiency, especially at high input voltages and light loads. It requires ≥4 V to operate, making it compatible with the 5.0-V output. Leaving VBS open defaults to VIN-powered operation.
Is LM2597N-5.0/NOPB RoHS-compliant and lead-free?
Yes, the LM2597N-5.0/NOPB is RoHS-compliant and lead-free, as indicated by the "/NOPB" suffix in the part number (TI's designation for lead-free, RoHS-compliant packaging). It meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for the PDIP package and is qualified for industrial temperature range (–40°C to +125°C junction). Full compliance documentation is available in TI's official product change notices.
LM2597N-5.0/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):
- 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/NOPB FAQ
1.How can I place an order for LM2597N-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2597N-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 LM2597N-5.0/NOPB reliable?
The price and inventory of LM2597N-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 LM2597N-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2597N-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2597N-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2597N-5.0/NOPB?
LM2597N-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2597N-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 LM2597N-5.0/NOPB?
For technical support, including LM2597N-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2597N-5.0/NOPB requirements.
6.How does Aetrix verify that LM2597N-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2597N-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 LM2597N-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2597N-5.0/NOPB?
All LM2597N-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2597N-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 LM2597N-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2597N-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2597N-5.0/NOPB Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
