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Texas Instruments LM2598S-5.0
- Part No.:
- LM2598S-5.0
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2598S-5.0.pdf
- Description:
- IC REG BUCK 5V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:3,604
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Product details
Overview
LM2598S-5.0 from Texas Instruments is a monolithic 150-kHz nonsynchronous step-down (buck) DC-DC converter delivering up to 1 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 thermal shutdown/current limit protection - used in on-card switching regulators and efficient preregulators for linear regulators.
For engineers reviewing the LM2598S-5.0 datasheet, LM2598S-5.0 pinout, LM2598S-5.0 application, or LM2598S-5.0 equivalent, key selection considerations include its fixed 5-V output, TO-263-7 (DDPAK) surface-mount package, 150-kHz fixed-frequency operation enabling compact filter design, and integrated soft-start/shutdown with 85-μA standby current.
Technical Context
The LM2598S-5.0 implements a nonsynchronous buck topology with internal power switch, fixed 150-kHz oscillator, and voltage-mode control loop using feedback from the regulated 5.0-V output. It features an internal two-stage current limit and thermal shutdown for fault protection.
Its shutdown/soft-start pin supports dual functionality: logic-level shutdown (reducing quiescent current to 85 μA) and external capacitor-controlled soft-start to limit inrush current; the error flag pin provides open-collector dropout detection with programmable delay via external capacitor on the delay pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over full line/load/temperature range - ensures stable rail for digital logic or analog circuitry without external resistor divider. |
| Max Output Current | 1 A DC - supports moderate-power loads such as microcontrollers, sensors, or interface ICs without external current boosting. |
| Input Voltage Range | 4.5 V to 40 V - enables direct operation from 12-V or 24-V industrial buses, automotive batteries (with transient margin), and unregulated wall adapters. |
| Switching Frequency | 150 kHz (±15%) - allows use of standard, low-cost through-hole or SMT inductors (e.g., 68–100 μH) and reduces EMI compared to higher-frequency alternatives. |
| Quiescent Current | 85 μA in shutdown mode - minimizes system standby power, critical for battery-backed or energy-harvesting applications. |
| Efficiency | 82% typical at VIN = 12 V, IOUT = 1 A - reduces thermal load and improves power density versus linear regulators in medium-voltage-drop scenarios. |
| Thermal Protection | Internal thermal shutdown - automatically disables switching above 150°C junction temperature, preventing damage during overload or poor heatsinking. |
Pinout & Package
LM2598S-5.0 is housed in a 7-pin TO-263 (DDPAK) surface-mount package with exposed thermal pad, measuring 10.10 mm × 8.89 mm, optimized for high-power dissipation in compact PCB layouts without requiring a heatsink below 50°C ambient and <12-V output.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Power Switch Drain | Switching node connecting to external catch diode and inductor - requires minimal copper area to reduce EMI coupling into sensitive circuits. |
| 2 (+VIN) | Input Supply | Main DC input (up to 40 V); must be bypassed with low-ESR capacitor close to pin to supply peak switching current and suppress transients. |
| 3 (FLAG) | Error Flag Output | Open-collector signal pulled low when output drops >5% below 5.0 V - usable as microprocessor reset or system fault indicator. |
| 4 (GND) | Power Ground | Common return for power switch, control circuitry, and thermal pad - must be solidly connected to large PCB copper pour for thermal and noise performance. |
| 5 (DELAY) | Flag Delay Control | Capacitor-connected pin setting time delay between VOUT reaching 95% and FLAG going high - prevents false resets during startup. |
| 6 (FB) | Feedback Input | Internally tied to 5.0-V reference; not used in fixed-output version - must be left open per datasheet to avoid regulation instability. |
| 7 (SD/SS) | Shutdown/Soft-start | Logic-compatible input: <1.3 V = shutdown (85 μA IQ), >2 V = active; capacitor here enables controlled VOUT ramp-up to limit inrush. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0-V Output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity while guaranteeing ±4% accuracy across temperature and load. |
| Integrated Soft-start | External capacitor on SD/SS pin controls output voltage ramp rate, limiting inrush current to ~240 mA (vs. 1 A without), protecting input source and downstream capacitors. |
| Open-Collector Error Flag | Provides fail-safe monitoring of output regulation status with built-in 5% dropout threshold and programmable delay - simplifies system-level power sequencing and diagnostics. |
| Thermal Shutdown + Current Limit | Dual-stage protection: peak current limit (~1.5 A) prevents switch failure during short-circuit; thermal shutdown (>150°C) guards against sustained overload or inadequate heatsinking. |
| 150-kHz Fixed Oscillator | Enables predictable EMI profile and consistent inductor sizing - avoids frequency jitter issues seen in variable-frequency converters and supports standard off-the-shelf magnetics. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: On-board 12-V bus conversion to clean 5-V rail powering MCU, CAN transceivers, and sensors in harsh environments. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 5-V supply with thermal/current protection and error flag for system health monitoring. Use Value: Delivers 1-A continuous current at 82% efficiency with no external feedback components, reducing design complexity and improving reliability under wide temperature (-25°C to +125°C) and input voltage (7–40 V) ranges. | Use Scenario: Preregulation stage feeding low-dropout linear regulators in infotainment head units requiring ultra-low noise 5-V supply. IC Role / Device Role / Timing Role: High-efficiency step-down converter preceding LDOs to minimize heat generation and extend battery runtime during vehicle sleep modes. Use Value: 85-μA shutdown current and soft-start capability prevent brownouts during cold-cranking events while maintaining tight 5.0-V ±4% output stability across battery voltage swings. |
| Point-of-Load Converter | Positive-to-Negative Inverter |
Use Scenario: Local 5-V generation on dense PCBs where space constraints prohibit discrete buck controller + MOSFET solutions. IC Role / Device Role / Timing Role: Integrated buck converter with internal switch, eliminating gate driver and external high-side FET - simplifies layout and reduces component count. Use Value: TO-263-7 package with thermal pad enables 1-A operation without heatsink below 50°C ambient, supporting compact, fanless embedded designs. | Use Scenario: Generating -5-V rail from existing +12-V supply for op-amp biasing or RS-232 level shifting in instrumentation systems. IC Role / Device Role / Timing Role: Configured in inverting topology using external diode and inductor - leverages same 5-V fixed-output IC for bipolar supply generation. Use Value: Enables -5-V output with only three external components (diode, inductor, capacitor); LM2598S-5.0's 150-kHz switching frequency ensures stable closed-loop operation in inverted configuration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596S-5.0 | Same pinout, 150-kHz frequency, but lower 3.5-A current rating and different thermal characteristics; uses TO-263-5 package (no DELAY/FLAG pins). | Lacks error flag and delay functions - unsuitable where power-good signaling or sequenced startup is required. | Select LM2596S-5.0 only if higher output current is needed and flag/delay features are unnecessary. |
| MP1584EN-LF-Z | 3-A synchronous buck, 1.5-MHz switching, smaller solution size, but requires external compensation and lacks integrated soft-start/flag. | No native error flag or programmable delay - demands additional supervisor IC for reset generation and timing control. | Choose MP1584EN-LF-Z for space-constrained, high-efficiency designs where external supervision is acceptable and 3-A output is required. |
Compared with LM2598S-5.0, LM2596S-5.0 offers higher current but omits fault-monitoring features, while MP1584EN-LF-Z delivers greater efficiency and integration density at the cost of added design complexity and loss of built-in power sequencing support.
Availability
LM2598S-5.0 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and point-of-load converters requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2598S-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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies with broad industrial, automotive, and consumer reach.
The LM2598 series belongs to TI's SIMPLE SWITCHER® power converter family, designed specifically for ease-of-use in non-isolated DC-DC buck applications where minimal external components, robust protection, and fixed-output simplicity are prioritized over ultra-high efficiency or ultra-small footprint.
FAQ
What is the maximum input voltage rating for the LM2598S-5.0?
The LM2598S-5.0 has an absolute maximum input voltage rating of 45 V, with recommended operating range from 4.5 V to 40 V. Operation beyond 40 V risks exceeding safe operating area limits and may trigger internal protection or cause permanent damage. The 40-V upper limit ensures reliable operation under transient conditions common in automotive and industrial 24-V systems.
Does the LM2598S-5.0 require external feedback resistors to set the output voltage?
No, the LM2598S-5.0 does not require external feedback resistors because it is a fixed 5.0-V output variant. Its feedback pin (FB) is internally connected to the 5.0-V reference and must be left open per the datasheet - adding external resistors would disrupt regulation and potentially cause instability or incorrect output voltage.
Can the LM2598S-5.0 be used in an inverting configuration to generate a negative output voltage?
Yes, the LM2598S-5.0 can be configured as a positive-to-negative inverter to generate -5 V. This requires external components including a Schottky diode, inductor, and capacitor, with the regulator's ground pin referenced to the negative output. The LM2598S-5.0's fixed 5-V reference enables accurate -5-V regulation, and its soft-start feature helps manage high inrush currents typical of inverting topologies.
What thermal management is required for the LM2598S-5.0 in a TO-263 package?
The LM2598S-5.0 in the TO-263-7 (KTW) package achieves a junction-to-ambient thermal resistance of 30°C/W with 0.5 in² of 1-oz copper and 20°C/W with 3 in² on a double-sided board. For 1-A operation at 12-V input, no external heatsink is required if ambient stays below 50°C and sufficient PCB copper area is provided under the thermal pad - verified by TI's layout guidelines and thermal simulations.
How does the error flag and delay functionality work on the LM2598S-5.0?
The LM2598S-5.0's FLAG pin goes low when output voltage drops below 95% of 5.0 V (i.e., <4.75 V). The DELAY pin accepts an external capacitor that sets the time between VOUT reaching 95% and FLAG transitioning high - preventing premature system release from reset during startup. This delay is fully configurable and independent of load or input conditions.
LM2598S-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:
- Tube
- 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)
LM2598S-5.0 FAQ
1.How can I place an order for LM2598S-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2598S-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 LM2598S-5.0 reliable?
The price and inventory of LM2598S-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 LM2598S-5.0 is usually 5 days.
3.What payment methods are accepted for LM2598S-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2598S-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2598S-5.0?
LM2598S-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2598S-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 LM2598S-5.0?
For technical support, including LM2598S-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2598S-5.0 requirements.
6.How does Aetrix verify that LM2598S-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2598S-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 LM2598S-5.0 meets industry standards.
7.What is the process for return or replacement of LM2598S-5.0?
All LM2598S-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2598S-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 LM2598S-5.0 part is unused and in its original packaging.
Return procedure for LM2598S-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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