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Texas Instruments LM2597MX-5.0
- Part No.:
- LM2597MX-5.0
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2597MX-5.0.pdf
- Description:
- IC REG BUCK 5V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,966
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Product details
Overview
LM2597MX-5.0 from Texas Instruments is a monolithic 150-kHz nonsynchronous step-down (buck) DC-DC converter IC 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 on-card power supplies for industrial controllers and embedded systems.
For engineers reviewing the LM2597MX-5.0 datasheet, LM2597MX-5.0 pinout, LM2597MX-5.0 application, or LM2597MX-5.0 equivalent, key selection considerations include its 8-pin SOIC package, bias supply (VBS) pin for efficiency optimization at high VIN/low VOUT, 85 μA standby quiescent current, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2597MX-5.0 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 - all operating from a single input supply.
Its functional block includes dedicated pins for shutdown/soft-start (dual-mode logic-controlled enable and ramp control), open-collector error flag with built-in 5% dropout detection and programmable delay, and bias supply (VBS) pin allowing internal circuitry to be powered from VOUT instead of VIN - improving efficiency by reducing switching losses under high-input-voltage 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 core or peripheral rail without external resistor divider. |
| Max Output Current | 0.5 A DC - supports moderate-power digital loads such as FPGA I/O banks or sensor interface circuits. |
| Input Voltage Range | 4.5 V to 40 V - accommodates wide-input industrial 24 V DC systems and automotive 12 V nominal with transients. |
| Switching Frequency | 150 kHz (±15%) - enables use of compact, low-cost 100–220 μH shielded inductors and reduces EMI filtering complexity. |
| Standby Quiescent Current | 85 μA typical - minimizes battery drain in always-on monitoring systems during sleep mode. |
| Saturation Voltage | 1.1 V max at 0.5 A - defines conduction loss in internal switch; impacts thermal design and efficiency at high duty cycles. |
| Feedback Reference Voltage | Not applicable - fixed-output version lacks external feedback node; no VFB pin connection required. |
Pinout & Package
LM2597MX-5.0 is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, optimized for surface-mount assembly and thermal performance with 95°C/W junction-to-ambient resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Error Flag | Open-collector output | Asserts low when VOUT drops >5% below 5.0 V; used for microprocessor reset or system fault signaling. |
| 2 - Delay | Capacitor-connected timing node | Controls delay between VOUT reaching 4.75 V and Error Flag deassertion - prevents premature system wake-up. |
| 3 - Bias Supply (VBS) | Power input for internal circuitry | Accepts 3.5–30 V; connecting to VOUT improves efficiency at high VIN/low VOUT (e.g., 24 V → 5 V), reducing IQ and junction temperature. |
| 4 - Feedback | Not connected (NC) | Internally tied to 5.0 V reference; no external resistor network needed - simplifies layout and eliminates tuning errors. |
| 5 - Shutdown/Soft-Start | Logic input with dual function | Pull ≤0.6 V to shut down (IQ ≈ 85 μA); add capacitor for controlled VOUT ramp - limits inrush current in battery-powered systems. |
| 6 - Ground | Power and signal reference | Common return for internal switch, error amplifier, and oscillator - requires low-impedance PCB plane for noise immunity. |
| 7 - +VIN | Main power input | Accepts 4.5–40 V; requires local 100 nF ceramic bypass capacitor to suppress switching transients and stabilize regulation. |
| 8 - Output | Switch node | Drives external catch diode and inductor; swings between ~VIN and −0.5 V - demands minimal copper area to reduce EMI coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.5-A DMOS switch | Eliminates need for external MOSFET and gate driver - reduces BOM count and layout area in space-constrained designs. |
| Shutdown/Soft-Start pin | Single-pin control of both enable/disable and output voltage slew rate - simplifies sequencing in multi-rail systems without extra logic. |
| Error Flag with delay | Provides reliable power-good indication with user-adjustable hold-off time - avoids false resets during transient load steps or cold starts. |
| Bias Supply (VBS) pin | Enables powering internal circuitry from regulated 5.0 V output - cuts quiescent losses by ~50% vs. VIN supply at 24 V input, improving light-load efficiency. |
| Thermal shutdown & current limit | Two-stage current limiting (0.65–1.3 A peak) plus 150°C junction cutoff - protects against short-circuit, overload, and PCB trace overheating without external sensing. |
Applications
| Industrial PLC I/O Power | Automotive Body Control Module |
|---|---|
Use Scenario: Providing isolated 5.0 V rail for digital I/O expansion cards in programmable logic controllers with 24 V DC field bus input. IC Role / Device Role / Timing Role: Primary buck regulator converting 24 V field supply to clean 5.0 V for microcontroller peripherals and optocoupler drivers. Use Value: 150 kHz switching allows small 100 μH inductor and 100 μF output capacitor - fits within tight card-edge height constraints while maintaining >82% efficiency at 0.4 A. | Use Scenario: Generating 5.0 V for CAN transceivers and microcontroller cores in body control units exposed to 12 V automotive battery with load dump transients. IC Role / Device Role / Timing Role: Pre-regulator stepping down 12–28 V battery range to stable 5.0 V before LDO post-regulation. Use Value: 40 V absolute maximum input rating withstands ISO 7637-2 Pulse 5a (60 V/100 ms) without external clamping - reduces protection component count. |
| Medical Sensor Interface Board | POS Terminal Power Management |
Use Scenario: Powering analog front-end and low-power MCU on portable patient monitoring sensors with coin-cell or Li-ion backup. IC Role / Device Role / Timing Role: Main DC-DC converter operating from 3.6–4.2 V Li-ion to deliver regulated 5.0 V for USB host and display backlight drivers. Use Value: 85 μA standby current extends battery life beyond 12 months in sleep mode - critical for maintenance-free wearable deployments. | Use Scenario: On-board 5.0 V generation for payment terminal logic, EMV smartcard reader, and thermal printer interface from 12 V wall adapter. IC Role / Device Role / Timing Role: High-efficiency primary regulator supporting burst-mode operation during intermittent transaction processing. Use Value: Soft-start function limits inrush to <160 mA at startup - prevents brownout of shared 12 V supply feeding multiple subsystems simultaneously. |
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 150 kHz frequency and 0.5 A rating, but lacks VBS pin and error flag/delay functionality; higher 10 mA quiescent current. | No built-in power-good signaling or bias supply efficiency boost - requires external reset IC and delivers lower light-load efficiency. | Select when cost sensitivity outweighs diagnostic capability and efficiency optimization needs. |
| TPS54302DDCR | Higher 3 A rating, 2.5 MHz switching, integrated high-side FET, but requires external compensation and has no error flag pin. | Supports higher current and smaller magnetics, yet adds design complexity and lacks fault reporting - unsuitable where simple reset signaling is mandatory. | Select when scaling to >0.5 A loads or requiring ultra-compact solution with synchronous rectification. |
Compared with LM2596-5.0, LM2597MX-5.0 provides superior system-level reliability via integrated error flag and lower standby consumption; versus TPS54302DDCR, it trades higher current capability for plug-and-play simplicity, fixed-frequency stability, and diagnostic readiness in cost-sensitive industrial designs.
Availability
LM2597MX-5.0 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical sensor power applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2597MX-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 expertise in high-reliability power conversion solutions.
The LM2597 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for engineers needing robust, easy-to-implement DC-DC converters with minimal external components and proven field reliability in harsh environments.
FAQ
What is the maximum input voltage rating for the LM2597MX-5.0?
The LM2597MX-5.0 has a maximum input voltage rating of 40 V, as specified in the Absolute Maximum Ratings table. This allows safe operation in 24 V industrial systems with transient spikes up to 40 V. Exceeding this voltage risks permanent damage. The related LM2597HV-5.0 variant supports up to 60 V input, but LM2597MX-5.0 must remain within the 40 V limit.
Does the LM2597MX-5.0 require an external feedback resistor network?
No, the LM2597MX-5.0 does not require an external feedback resistor network. As a fixed-output 5.0 V version, its feedback node is internally connected to the precision 5.0 V reference. Pin 4 (Feedback) is a no-connect (NC) terminal in this variant - eliminating tuning errors and simplifying PCB layout compared to adjustable versions like LM2597-ADJ.
How does the Bias Supply (VBS) pin improve efficiency in the LM2597MX-5.0?
The VBS pin in the LM2597MX-5.0 allows internal circuitry to be powered from the regulated 5.0 V output instead of the higher input voltage. When VIN is 24 V, routing VBS to VOUT reduces internal power dissipation - lowering quiescent current from ~5 mA (VIN-powered) to ~85 μA (VOUT-powered), directly improving light-load efficiency and reducing junction temperature in continuous-operation systems.
Can the LM2597MX-5.0 be used in an inverting (positive-to-negative) configuration?
Yes, the LM2597MX-5.0 can be configured as a positive-to-negative inverter - for example, generating –5.0 V from a +12 V input. This requires bootstrapping the GND pin to the negative output and grounding the feedback node. The maximum |VIN| + |VOUT| must not exceed 40 V. While feasible, the inverting topology demands careful layout, a Schottky catch diode, and soft-start to manage high startup currents - documented in TI's application note SNVA262.
What thermal management guidance applies to the LM2597MX-5.0 in SOIC package?
The LM2597MX-5.0 in SOIC (D) package has a junction-to-ambient thermal resistance (RθJA) of 95°C/W with 1 in² copper pad. To maintain safe operation at 0.5 A, ensure ≥1 in² of 2-oz copper connected to Pin 6 (GND) and Pin 7 (+VIN), minimize trace length to input/output capacitors, and avoid enclosing the IC in sealed enclosures. Thermal shutdown activates at 150°C junction temperature - derate output current above 85°C ambient per the thermal curves in the datasheet.
LM2597MX-5.0 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:
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM2597MX-5.0 FAQ
1.How can I place an order for LM2597MX-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2597MX-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 LM2597MX-5.0 reliable?
The price and inventory of LM2597MX-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 LM2597MX-5.0 is usually 5 days.
3.What payment methods are accepted for LM2597MX-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2597MX-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2597MX-5.0?
LM2597MX-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2597MX-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 LM2597MX-5.0?
For technical support, including LM2597MX-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2597MX-5.0 requirements.
6.How does Aetrix verify that LM2597MX-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2597MX-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 LM2597MX-5.0 meets industry standards.
7.What is the process for return or replacement of LM2597MX-5.0?
All LM2597MX-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2597MX-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 LM2597MX-5.0 part is unused and in its original packaging.
Return procedure for LM2597MX-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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