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Texas Instruments LM2597MX-5.0/NOPB
- Part No.:
- LM2597MX-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2597MX-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,639
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Product details
Overview
LM2597MX-5.0/NOPB 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 - used in industrial power supplies and embedded system point-of-load regulation.
For engineers reviewing the LM2597MX-5.0/NOPB datasheet, LM2597MX-5.0/NOPB pinout, LM2597MX-5.0/NOPB application, or LM2597MX-5.0/NOPB equivalent, key selection criteria include its 8-pin SOIC package, bias supply (VBS) pin for efficiency optimization at high VIN/low VOUT, 85-μA standby current, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2597MX-5.0/NOPB implements a fixed-frequency (150 kHz) current-mode control architecture with internal frequency compensation, enabling stable operation with minimal external components. It integrates a 0.5-A N-channel DMOS switch, feedback comparator, oscillator, and error amplifier in a single die.
Its functional block includes dedicated pins for shutdown/soft-start (dual-mode logic-controlled input), open-collector error flag with built-in 5% dropout detection and programmable delay, and bias supply (VBS) pin that powers internal circuitry from VOUT instead of VIN - reducing power dissipation and improving efficiency under high-input-voltage, low-output-current 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 sensor rail without external resistor divider. |
| Max Output Current | 0.5 A DC - supports moderate-power loads such as FPGA I/O banks or analog front-ends without external current boosting. |
| Input Voltage Range | 4.5 V to 40 V - accommodates wide-input industrial 24-V systems and automotive battery-supplied designs (non-HV variant). |
| Switching Frequency | 150 kHz (±15%) - enables use of compact, low-cost 100–220 μH inductors and reduces EMI compared to lower-frequency alternatives. |
| Standby Quiescent Current | 85 μA typical - minimizes battery drain in always-on monitoring circuits during shutdown mode. |
| Efficiency | 82% typical at VIN = 12 V, VOUT = 5 V, IOUT = 0.5 A - reduces thermal load on PCB copper traces, eliminating need for heatsinks in most applications. |
| Thermal Resistance | RθJA = 95 °C/W (SOIC-8) - allows continuous 0.5-A operation at ambient ≤85°C with standard 1-inch² copper pour. |
Pinout & Package
LM2597MX-5.0/NOPB is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package measuring 4.90 mm × 3.91 mm, optimized for surface-mount assembly and thermal performance on standard FR-4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Error Flag | Open-collector output | Asserts low when VOUT drops >5% below nominal; used for MCU reset or fault signaling - requires external pull-up. |
| 2 - Delay | Capacitor-connected timing node | Sets delay between VOUT reaching 95% and Error Flag going high - prevents false resets during startup ramp. |
| 3 - Bias Supply (VBS) | Power input for internal circuitry | Accepts VOUT (≥3.5 V) to reduce VIN current draw and improve efficiency at high VIN/low IOUT - not usable with 3.3-V version. |
| 4 - Feedback | Inverting input of error amplifier | Monitors regulated 5-V output via internal resistor divider - no external resistors required for fixed-output variants. |
| 5 - Shutdown/Soft-Start | Logic input with dual function | Pulled low → shutdown (IQ ≈ 85 μA); capacitor added → soft-start with controlled VOUT ramp and reduced inrush current. |
| 6 - Ground | Power and signal reference | Common return path for internal switch, error amp, and oscillator - must be connected to low-impedance PCB ground plane. |
| 7 - +VIN | Main power input | Accepts 4.5–40 V DC; requires local 100-nF ceramic bypass capacitor to suppress switching transients. |
| 8 - Output | Internal switch drain | Drives external catch diode and inductor; switches between ~0 V and (VIN − VSAT); layout must minimize trace area to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.5-A DMOS switch | Eliminates need for external MOSFET and gate driver - simplifies BOM and reduces footprint in space-constrained designs. |
| Fixed 5-V output with ±4% tolerance | Guarantees compliance with 5-V TTL/CMOS logic and USB peripheral power specs without post-regulation or trimming. |
| Bias supply (VBS) pin | Enables powering internal circuitry from VOUT, cutting VIN current by ~4 mA and improving efficiency up to 5% at VIN = 36 V, IOUT = 100 mA. |
| Shutdown/Soft-Start dual-function pin | Reduces peak inrush current from 700 mA to 160 mA (typical) and enables logic-controlled enable/disable - supports battery-powered wake/sleep cycles. |
| Out-of-regulation error flag with delay | Provides reliable power-good signaling with user-adjustable hold-off time - avoids premature MCU boot before stable 5-V rail is established. |
Applications
| Industrial Sensor Node Power | Embedded Controller Pre-regulator |
|---|---|
Use Scenario: Powering 5-V analog sensors and low-power microcontrollers in remote environmental monitoring units powered by 24-V DC industrial bus. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24-V input to clean, regulated 5-V rail with low quiescent current during sleep mode. Use Value: 85-μA standby current extends battery life in wireless nodes; ±4% output tolerance ensures ADC reference stability across temperature. |
Use Scenario: Generating intermediate 5-V rail for downstream linear regulators (e.g., LDOs) supplying noise-sensitive RF or audio circuitry. IC Role / Device Role / Timing Role: High-efficiency preregulator reducing thermal stress on final LDO stage while maintaining tight transient response. Use Value: 82% efficiency at 12-V input cuts heat generation by >50% vs. direct LDO solution - enabling smaller PCB area and higher reliability. |
| On-Card Buck Converter | Positive-to-Negative Inverter |
Use Scenario: Local 5-V conversion on dense digital boards where centralized 5-V supply is unavailable or insufficient. IC Role / Device Role / Timing Role: Compact, self-contained buck converter using only one inductor, one diode, and two capacitors - no external ICs required. Use Value: SOIC-8 footprint (4.9 × 3.9 mm) and compatibility with standard 100–220 μH shielded inductors accelerate layout and prototyping. |
Use Scenario: Generating –5-V rail from +24-V input for op-amp biasing or legacy interface circuits requiring dual supplies. IC Role / Device Role / Timing Role: Configured in inverting topology with grounded feedback pin and bootstrapped ground - no additional controller needed. Use Value: Enables bipolar supply generation with same IC family; maximum |VIN| + |VOUT| ≤ 40 V constraint validated for 24-V → –5-V design (29 V total). |
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 | Lower max input voltage (40 V same), but 1.5-A output current and 150-kHz frequency - larger internal switch and higher thermal capacity. | Supports higher load currents; requires larger inductor (47–100 μH) and different compensation due to higher current loop gain. | Select when >0.5-A output is needed and board space allows larger magnetics and thermal margin. |
| TPS54302DDCR | 36-V input, 3-A synchronous buck with integrated high-side/low-side FETs, 2.5-V to 6-V output adjustable, 500-kHz switching. | Higher efficiency (>90%), smaller solution size, but requires external feedback resistors and lacks dedicated error flag/delay pins. | Select for new designs prioritizing efficiency and density over pin-compatible replacement - not drop-in for LM2597MX-5.0/NOPB. |
Compared with LM2597MX-5.0/NOPB, LM2596-5.0 offers higher current headroom at identical voltage and frequency, while TPS54302DDCR delivers superior efficiency and integration at the cost of losing dedicated supervisory features and fixed-output simplicity.
Availability
LM2597MX-5.0/NOPB is available at Aetrix Electronics and suitable for industrial sensor nodes, embedded controller pre-regulators, on-card buck converters, and positive-to-negative inverter circuits requiring stable component supply and long-term manufacturability.
Supply support for LM2597MX-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 expertise in high-reliability power conversion ICs.
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 critical.
FAQ
What is the maximum input voltage rating for LM2597MX-5.0/NOPB?
The LM2597MX-5.0/NOPB has a maximum input voltage rating of 40 V, as specified in the Absolute Maximum Ratings table. This distinguishes it from the LM2597HV variant (60 V max). Exceeding 40 V risks permanent damage, and operation above 40 V is not supported even briefly - the device must be used within 4.5 V to 40 V per Recommended Operating Conditions.
Does LM2597MX-5.0/NOPB require external feedback resistors to set the 5-V output?
No, LM2597MX-5.0/NOPB does not require external feedback resistors. It is a fixed-output variant with an internal resistor divider calibrated for 5.0 V ±4%. Pin 4 (Feedback) connects directly to the internal reference node - leaving it unconnected or floating is incorrect; it must be tied to the output node per the datasheet schematic for proper regulation.
Can the VBS (Bias Supply) pin be used with LM2597MX-5.0/NOPB?
Yes, the VBS pin can be used with LM2597MX-5.0/NOPB. Since its output is 5 V - above the minimum 3.5 V (4 V at −40°C) required - connecting VBS directly to VOUT improves efficiency by powering internal circuitry from the regulated output instead of VIN. This reduces VIN current draw by ~4 mA and lowers junction temperature, especially at high input voltages.
What is the purpose of the Delay pin (Pin 2) on LM2597MX-5.0/NOPB?
The Delay pin (Pin 2) sets the time interval between when the output voltage reaches 95% of nominal (e.g., 4.75 V) and when the Error Flag (Pin 1) transitions high. A capacitor from this pin to ground determines the delay - typically 10–100 nF - preventing premature system reset during startup. It is not required for basic operation but essential for robust power-good sequencing in microcontroller-based systems.
Is LM2597MX-5.0/NOPB RoHS-compliant and lead-free?
Yes, LM2597MX-5.0/NOPB is RoHS-compliant and lead-free. The "/NOPB" suffix explicitly denotes lead-free packaging per TI's product nomenclature. It meets JEDEC J-STD-020 moisture sensitivity level (MSL) 3 requirements and is qualified for reflow soldering per IPC/JEDEC J-STD-020 standards.
LM2597MX-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
LM2597MX-5.0/NOPB FAQ
1.How can I place an order for LM2597MX-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2597MX-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 LM2597MX-5.0/NOPB reliable?
The price and inventory of LM2597MX-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 LM2597MX-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2597MX-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2597MX-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2597MX-5.0/NOPB?
LM2597MX-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2597MX-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 LM2597MX-5.0/NOPB?
For technical support, including LM2597MX-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2597MX-5.0/NOPB requirements.
6.How does Aetrix verify that LM2597MX-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2597MX-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 LM2597MX-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2597MX-5.0/NOPB?
All LM2597MX-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2597MX-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 LM2597MX-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2597MX-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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