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Texas Instruments LM2598S-12/NOPB
- Part No.:
- LM2598S-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2598S-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:126
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Product details
Overview
LM2598S-12/NOPB from Texas Instruments is a monolithic 150-kHz nonsynchronous step-down (buck) DC-DC converter delivering 1-A output current with fixed 12-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 power supplies for industrial control modules.
For engineers reviewing the LM2598S-12/NOPB datasheet, LM2598S-12/NOPB pinout, LM2598S-12/NOPB application, or LM2598S-12/NOPB equivalent, key selection criteria include fixed 12-V output accuracy, TO-263-7 package thermal performance, shutdown/soft-start control interface, and error flag signaling for system reset coordination.
Technical Context
The LM2598S-12/NOPB integrates a PWM controller, power switch, oscillator, and protection circuitry in a single chip. It operates at a fixed 150-kHz switching frequency, enabling compact external filter components, and uses internal frequency compensation to simplify design with standard inductors and capacitors.
Its feedback loop regulates output by sensing voltage at the Feedback pin (VFB = 1.23 V), while the Shutdown/Soft-start pin supports logic-level enable/disable and controlled output ramp-up via external capacitor. The Error Flag pin provides open-collector dropout detection with built-in delay timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over full line/load/temperature range - ensures stable rail for microcontrollers and analog circuitry without external resistor divider. |
| Max Output Current | 1 A DC - supports mid-power embedded systems such as PLC I/O modules and sensor signal conditioning stages. |
| Input Voltage Range | 4.5 V to 40 V - accommodates wide-input industrial supplies including 24-V DC bus and automotive battery variations. |
| Switching Frequency | 150 kHz ±15% - enables use of low-cost, off-the-shelf 68–100 μH inductors and reduces EMI compared to lower-frequency alternatives. |
| Quiescent Current | 85 μA typical in shutdown mode - minimizes standby power loss in always-on monitoring equipment. |
| Thermal Protection | Internal thermal shutdown at 150°C junction temperature - prevents damage during overload or poor heatsinking in enclosed enclosures. |
| Efficiency | 90% typical at VIN = 25 V, IOUT = 1 A - reduces heat generation and improves power density in space-constrained designs. |
Pinout & Package
LM2598S-12/NOPB 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 PCB thermal conduction without mandatory heatsink below 50°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Power Switch Drain | Swings between ~VIN – 1.2 V and –0.5 V; connects to inductor node - requires minimal copper area to reduce EMI coupling. |
| 2 (+VIN) | Input Supply | Accepts 4.5–40 V; requires local 100-μF low-ESR input capacitor to supply pulsed switch current and suppress transients. |
| 3 (FLAG) | Error Flag Output | Open-collector active-low signal asserting when VOUT drops >5%; delays going high until VOUT reaches 95% of nominal - usable as microprocessor 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 management. |
| 5 (DELAY) | Flag Delay Timing | Sets error flag assertion delay via external capacitor; threshold is 1.25 V - determines power-good timing window for downstream logic. |
| 6 (FEEDBACK) | Voltage Sense Input | Monitors regulated output via resistive divider; reference voltage is 1.23 V - not used in fixed 12-V version (internally connected). |
| 7 (SD/SS) | Shutdown/Soft-start Control | Logic-level input: <1.3 V disables regulator (ISTBY ≈ 85 μA); >2 V enables with soft-start ramp controlled by external capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12-V Output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity while maintaining ±4% regulation across temperature and load. |
| Integrated Soft-start | Prevents inrush current spikes during power-up by controlling output voltage ramp rate - critical for systems with large output capacitance or current-limited sources. |
| Error Flag with Delay | Provides synchronized power-good signal with programmable hold-off time, enabling reliable microcontroller initialization before firmware execution. |
| Thermal & Current Limit Protection | Two-stage current limiting and automatic thermal shutdown ensure robust operation under short-circuit or overheating conditions without external circuitry. |
| 150-kHz Fixed Oscillator | Enables predictable EMI profile and simplifies EMI filter design using standardized inductor values widely available from multiple suppliers. |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: On-board 12-V buck regulator supplying power to microcontroller, CAN transceiver, and sensor interfaces in a DIN-rail mounted PLC. IC Role / Device Role / Timing Role: Primary DC-DC conversion stage converting 24-V field bus to clean, regulated 12-V rail with error flag signaling power stability to MCU. Use Value: Delivers 1-A continuous current with 90% efficiency at 25-V input, minimizing thermal stress in sealed enclosures without forced airflow. | Use Scenario: Local 12-V power source for door module electronics powered from vehicle battery (9–16 V nominal, up to 40 V during load dump). IC Role / Device Role / Timing Role: Nonsynchronous buck regulator providing fault-tolerant 12-V rail with shutdown control from body controller and error flag for diagnostic reporting. Use Value: Withstands 40-V transients and maintains regulation down to 4.5-V cold-crank condition, supporting ASIL-B functional safety requirements via built-in protections. |
| Test Equipment Auxiliary Rail | Point-of-Load Converter for FPGA I/O |
Use Scenario: Secondary 12-V supply in automated test equipment generating calibrated analog signals requiring low-noise, stable voltage. IC Role / Device Role / Timing Role: Step-down regulator feeding precision DACs and op-amp buffers, with soft-start preventing measurement offset during power-up. Use Value: ±4% output tolerance and excellent line regulation (<0.2%/V) ensure consistent analog output accuracy across varying AC-DC adapter loads. | Use Scenario: Dedicated 12-V rail for FPGA I/O banks and transceivers in high-speed communication boards where noise-sensitive SerDes lanes coexist with digital logic. IC Role / Device Role / Timing Role: Compact, thermally efficient point-of-load converter placed near FPGA BGA, using TO-263 thermal pad for direct PCB heat spreading. Use Value: TO-263 package achieves 20°C/W junction-to-ambient (with 3 in² copper), enabling 1-A operation without heatsink in multi-layer PCB layouts. |
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-12/NOPB | Same 12-V fixed output, but 150-kHz frequency and 3-A rating; larger TO-263-5 package with different pinout (no DELAY or FLAG pins). | Lacks error flag and delay functionality - unsuitable where power-good sequencing or diagnostics are required. | Select LM2596S-12/NOPB only when higher current headroom is needed and FLAG/DELAY features are unused. |
| TPS54202DRCT | 2-A synchronous buck with 4.5–28-V input, 500-kHz switching, integrated FETs, and enable/PGOOD pins - no thermal pad or FLAG delay. | Higher efficiency at light loads due to synchronous rectification; lacks ±4% tight tolerance and 40-V input capability. | Choose TPS54202DRCT for space-constrained, high-efficiency designs with <28-V input and no need for 40-V transient handling. |
Compared with LM2596S-12/NOPB and TPS54202DRCT, LM2598S-12/NOPB uniquely combines 40-V input tolerance, integrated error flag with programmable delay, and ±4% output accuracy in a thermally optimized TO-263-7 package - making it optimal for industrial and automotive applications demanding robustness and system-level power sequencing.
Availability
LM2598S-12/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2598S-12/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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs for industrial, automotive, and communications markets.
The LM2598 series belongs to TI's SIMPLE SWITCHER® power converter family, 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 LM2598S-12/NOPB?
The LM2598S-12/NOPB has an absolute maximum input voltage rating of 45 V, with recommended operating range from 4.5 V to 40 V. Operation above 40 V is permissible only for short-duration transients such as automotive load dump, provided thermal limits are maintained and external clamping is considered.
Does LM2598S-12/NOPB require an external feedback resistor network?
No, LM2598S-12/NOPB does not require external feedback resistors because it is a fixed-output variant with internal voltage reference and divider set for 12 V. The FEEDBACK pin is internally connected and must not be externally biased - doing so may cause regulation failure or damage.
How does the Error Flag pin function in LM2598S-12/NOPB?
The Error Flag pin on LM2598S-12/NOPB is an open-collector output that pulls low when the regulated 12-V output falls more than 5% below nominal (i.e., below 11.4 V). It remains low during startup until VOUT reaches 95% of 12 V (11.4 V) and the DELAY pin capacitor charges to threshold - commonly used as a power-good reset signal for microcontrollers.
Can LM2598S-12/NOPB be used in a negative-output inverting configuration?
Yes, LM2598S-12/NOPB can be configured as an inverting regulator to generate –12 V from a positive input, using the topology shown in TI's SLVA001 application note. However, the maximum input-to-ground voltage must remain ≤40 V, and startup inrush current is higher - soft-start is strongly recommended to avoid input source collapse.
What thermal considerations apply to LM2598S-12/NOPB in TO-263 package?
LM2598S-12/NOPB in TO-263 package achieves 20°C/W junction-to-ambient thermal resistance when mounted on a double-sided PCB with 3 in² copper on the device side and ~16 in² on the opposite layer. For reliable 1-A operation at 125°C ambient, minimum 0.5 in² copper area under the thermal pad is required, and solder mask opening over the pad is recommended.
LM2598S-12/NOPB 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:
- 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):
- 12V
- 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-12/NOPB FAQ
1.How can I place an order for LM2598S-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2598S-12/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 LM2598S-12/NOPB reliable?
The price and inventory of LM2598S-12/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2598S-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2598S-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2598S-12/NOPB transactions.
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4.How is shipping managed for LM2598S-12/NOPB?
LM2598S-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2598S-12/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 LM2598S-12/NOPB?
For technical support, including LM2598S-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2598S-12/NOPB requirements.
6.How does Aetrix verify that LM2598S-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2598S-12/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 LM2598S-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2598S-12/NOPB?
All LM2598S-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2598S-12/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 LM2598S-12/NOPB part is unused and in its original packaging.
Return procedure for LM2598S-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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