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Texas Instruments LM2598SX-5.0
- Part No.:
- LM2598SX-5.0
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2598SX-5.0.pdf
- Description:
- IC REG BUCK 5V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:3,278
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Product details
Overview
LM2598SX-5.0 from Texas Instruments is a monolithic 150-kHz nonsynchronous step-down (buck) DC-DC switching regulator delivering up to 1 A output current with fixed 5.0-V output, ±4% output voltage tolerance over line and load, and input voltage range up to 40 V. It integrates internal frequency compensation, thermal shutdown, current limiting, and soft-start/shutdown control - used in industrial power supplies, embedded system point-of-load conversion, and automotive auxiliary rails.
For engineers reviewing the LM2598SX-5.0 datasheet, LM2598SX-5.0 pinout, LM2598SX-5.0 application, or LM2598SX-5.0 equivalent, key selection considerations include its 7-pin TO-263 (DDPAK) package, 85-μA standby quiescent current, 127–173-kHz oscillator tolerance, error flag with delay timing, and compatibility with standard off-the-shelf inductors for rapid design implementation.
Technical Context
The LM2598SX-5.0 operates as a fixed-frequency (150 kHz) current-mode buck converter with integrated NPN switch, requiring only external diode, inductor, and input/output capacitors. Its feedback loop uses a precision 1.23-V reference and senses output via dedicated FB pin, enabling stable regulation across 7 V–40 V input and 0.1 A–1 A load.
It implements dual-function SD/SS pin for logic-level shutdown (80 μA standby) and capacitor-controlled soft-start, plus open-collector Error Flag pin with built-in 5% dropout detection and programmable delay via external capacitor on DELAY pin - supporting power sequencing and microprocessor reset signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over full line/load/temperature range - ensures reliable 5-V rail compliance without external resistor divider. |
| Max Output Current | 1 A DC - supports mid-power applications like FPGA I/O banks or sensor signal chains without external current boosting. |
| Input Voltage Range | 4.5 V to 40 V - accommodates wide-input industrial and automotive battery-fed systems including 12-V and 24-V nominal rails. |
| Switching Frequency | 150 kHz (±15%) - enables use of compact, low-cost 10–100 μH inductors and reduces EMI filtering complexity vs. lower-frequency alternatives. |
| Quiescent Current | 85 μA typical in shutdown - minimizes battery drain in always-on subsystems such as telematics wake-up circuits. |
| Efficiency | 82% typical at VIN = 12 V, IOUT = 1 A - delivers high conversion efficiency without synchronous rectification or complex layout. |
| Thermal Protection | Internal thermal shutdown + current limit - prevents damage during overload or poor heatsinking; no external thermal sensor required. |
Pinout & Package
LM2598SX-5.0 is housed in a 7-pin TO-263 (DDPAK) surface-mount package with exposed thermal pad for enhanced heat dissipation. The package measures 10.10 mm × 8.89 mm and is optimized for high-current, medium-power density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Switch node | Drives external catch diode and inductor; swings between ~VIN–1.2 V and –0.5 V - requires minimal copper area to reduce EMI coupling. |
| 2 (+VIN) | Power input | Accepts 4.5–40 V supply; must be bypassed with low-ESR capacitor close to pin to handle high di/dt switching currents. |
| 3 (FLAG) | Error flag output | Open-collector active-low signal asserting when VOUT drops >5%; delays assertion by external capacitor on DELAY pin - usable as µP reset. |
| 4 (GND) | Power ground | Common return for internal switch, control circuitry, and thermal pad - must be connected to large PCB copper pour for thermal performance. |
| 5 (DELAY) | Delay timing | Sets error flag assertion delay after startup; capacitor value determines time until FLAG goes high once VOUT reaches 95% of 5.0 V. |
| 6 (FB) | Feedback input | Monitors regulated output via resistive divider (not used in fixed 5-V version); internally tied to 5.0-V reference - pin left unconnected per datasheet. |
| 7 (SD/SS) | Shutdown/Soft-start | Logic-compatible input: <1.3 V = shutdown (85 μA IQ), >2.0 V = active; capacitor adds controlled VOUT ramp - eliminates inrush current stress. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1-A NPN switch | Eliminates need for external high-side transistor and gate driver - reduces BOM count and layout complexity in buck designs. |
| Fixed 5.0-V output | Guarantees ±4% accuracy across –25°C to +125°C and 0.1–1 A load - removes calibration overhead for 5-V logic and analog subsystems. |
| 150-kHz fixed oscillator | Enables predictable EMI profile and simplifies filter design using standard 10–47 μH shielded inductors - avoids variable-frequency noise spread. |
| Shutdown/Soft-start pin | Single-pin dual function enables system-level power sequencing: logic-level disable (80 μA IQ) and capacitor-programmable VOUT ramp rate. |
| Error Flag with delay | Provides fault indication with user-defined hold-off time - prevents false resets during transient load steps or cold-start voltage droop. |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Providing isolated 5-V rail for microcontroller, CAN transceivers, and sensor interfaces in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator converting 24-V bus to stable 5-V logic supply with thermal protection and error reporting. Use Value: Delivers 1 A at 82% efficiency with no heatsink required below 50°C ambient - reduces enclosure size and cost versus linear regulators. | Use Scenario: Generating 5-V supply for door module ECUs powered from vehicle battery (9–16 V), surviving load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Input-tolerant step-down regulator with shutdown control synchronized to ignition state and error flag for diagnostic logging. Use Value: Withstands 40-V max input and features 85-μA shutdown current - extends battery life during vehicle sleep mode. |
| Medical Point-of-Care Instrument | Networking Edge Device |
Use Scenario: Powering ADCs, op-amps, and low-noise LDO pre-regulators in portable ultrasound or patient monitor front-ends. IC Role / Device Role / Timing Role: High-PSRR preregulator stage feeding downstream analog circuitry; soft-start prevents sensor bias disruption at power-on. Use Value: ±4% output tolerance and 150-kHz fixed frequency enable repeatable analog measurements without post-regulation trimming. | Use Scenario: Converting 12-V PoE midspan or wall adapter output to 5-V for Ethernet PHY, MCU, and USB peripherals in smart switches. IC Role / Device Role / Timing Role: Compact, surface-mount DC-DC converter with DDPAK thermal pad - fits dense 4-layer PCBs with limited board area. Use Value: TO-263 package allows direct thermal connection to inner-layer copper - sustains 1-A load without external heatsink in 70°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596SX-5.0 | Same 150-kHz frequency and 1-A rating, but uses PNP switch - higher dropout, lower efficiency (~75% at 12 V→5 V), and no error flag/delay features. | Lacks FLAG/DELAY pins and soft-start control - unsuitable where power sequencing or fault reporting is required. | Choose LM2596SX-5.0 only for cost-sensitive, non-critical applications where feature set can be reduced. |
| TPS54202DRCT | 2-A synchronous buck with 4.5–28-V input, 500-kHz operation, and integrated MOSFETs - higher efficiency (>90%), smaller solution size, but requires more external components and layout care. | Supports tighter output tolerance (±1%), light-load efficiency modes, and enable/PG pins - better for battery-powered or space-constrained designs. | Choose TPS54202DRCT when higher current, better efficiency, or smaller footprint outweighs simplicity and legacy compatibility. |
Compared with LM2596SX-5.0, LM2598SX-5.0 offers superior line/load regulation, integrated error flag, and soft-start - critical for robust industrial sequencing; versus TPS54202DRCT, it trades efficiency and integration for ease of use, fewer external parts, and proven reliability in harsh environments.
Availability
LM2598SX-5.0 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2598SX-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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM2598 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for engineers needing robust, easy-to-implement DC-DC buck regulators with minimal external components and broad input voltage tolerance.
FAQ
What is the maximum input voltage rating for the LM2598SX-5.0?
The LM2598SX-5.0 has an absolute maximum input voltage rating of 45 V, with recommended operating range from 4.5 V to 40 V. Exceeding 40 V continuously risks exceeding thermal limits or triggering internal protection; operation above 45 V may cause permanent damage. Always verify input transient suppression in automotive or industrial environments where load dump or inductive kick can exceed nominal rail voltage.
Does the LM2598SX-5.0 require an external feedback resistor network?
No - the LM2598SX-5.0 is the fixed 5.0-V output variant and contains internal resistor feedback network tied to its 1.23-V reference. Pin 6 (FB) is not connected in this version and must be left floating per TI datasheet guidance. External resistors are only required for the adjustable version (LM2598ADJ).
Can the LM2598SX-5.0 be used in an inverting (positive-to-negative) configuration?
Yes - the LM2598SX-5.0 supports inverting topology to generate –5 V from a positive input, as documented in TI's SNVS125D datasheet Figure 21. This requires re-referencing GND and FB pins, adding an isolation diode (e.g., Schottky), and selecting appropriate inductor/capacitor values. Startup current is higher than in buck mode, so soft-start is strongly recommended.
What thermal performance can be expected from the LM2598SX-5.0 in TO-263 package without a heatsink?
In the TO-263 (KTW) package with 2.5 in² of 1-oz copper on a single-sided PCB, the LM2598SX-5.0 achieves RθJA ≈ 30°C/W. At 1 A output and 12 V input (82% efficiency), power dissipation is ~1.1 W - resulting in ~33°C junction rise above ambient. Thus, no heatsink is needed below ~90°C ambient, per TI's thermal guidelines in Section 7.4.
How does the Error Flag and Delay functionality work on the LM2598SX-5.0?
The LM2598SX-5.0 asserts its open-collector Error Flag (Pin 3) low when output drops >5% below 5.0 V. Assertion is delayed by a capacitor on Pin 5 (DELAY); the delay time begins once VOUT reaches 95% of nominal. This allows clean power-up sequencing and prevents false resets during brief transients - commonly used to drive µP reset inputs with configurable timeout.
LM2598SX-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- 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:
- 1A
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-7)
LM2598SX-5.0 FAQ
1.How can I place an order for LM2598SX-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2598SX-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 LM2598SX-5.0 reliable?
The price and inventory of LM2598SX-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 LM2598SX-5.0 is usually 5 days.
3.What payment methods are accepted for LM2598SX-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2598SX-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2598SX-5.0?
LM2598SX-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2598SX-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 LM2598SX-5.0?
For technical support, including LM2598SX-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2598SX-5.0 requirements.
6.How does Aetrix verify that LM2598SX-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2598SX-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 LM2598SX-5.0 meets industry standards.
7.What is the process for return or replacement of LM2598SX-5.0?
All LM2598SX-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2598SX-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 LM2598SX-5.0 part is unused and in its original packaging.
Return procedure for LM2598SX-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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