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Texas Instruments LM2598T-12/NOPB
- Part No.:
- LM2598T-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LM2598T-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 1A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:2,181
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Product details
Overview
LM2598T-12/NOPB from Texas Instruments is a monolithic 150-kHz nonsynchronous step-down (buck) DC-DC converter delivering up to 1 A output current with fixed 12-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 regulation, and automotive auxiliary rails.
For engineers reviewing the LM2598T-12/NOPB datasheet, LM2598T-12/NOPB pinout, LM2598T-12/NOPB application, or LM2598T-12/NOPB equivalent, key selection criteria include its fixed 12-V output, TO-220-7 package thermal performance, 150-kHz switching frequency for compact filter design, and integrated error flag with programmable delay for system reset sequencing.
Technical Context
The LM2598T-12/NOPB implements a nonsynchronous buck topology with an internal NPN power switch, fixed 150-kHz oscillator, and voltage-mode feedback control using a resistive divider on the Feedback pin. Its error amplifier compares the scaled output voltage against a 1.23-V internal reference to adjust duty cycle.
It features dual-function Shutdown/Soft-start pin enabling logic-level disable (ISTBY = 85 μA typical) or capacitor-controlled ramp-up, plus open-collector Error Flag with 5% dropout detection and external Delay pin capacitor for configurable assertion timing - all operating across –25°C to +125°C junction temperature.
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 feedback resistors. |
| Max Output Current | 1 A DC - supports moderate-power loads such as sensors, actuators, or interface ICs without external current boosting. |
| Input Voltage Range | 4.5 V to 40 V - accommodates wide-input industrial and automotive battery-fed systems including 24-V nominal buses. |
| Switching Frequency | 150 kHz (±15%) - enables use of standard off-the-shelf inductors (e.g., 68–100 µH) and reduces EMI compared to lower-frequency alternatives. |
| Quiescent Current | 85 μA in shutdown mode - minimizes standby power draw in always-on or battery-backed applications. |
| Thermal Protection | Internal thermal shutdown at 150°C junction - prevents damage during overload or poor heatsinking conditions. |
| Efficiency | 90% typical at VIN = 25 V, IOUT = 1 A - reduces heat generation and improves power budget in thermally constrained enclosures. |
Pinout & Package
LM2598T-12/NOPB is supplied in a 7-pin TO-220 (NDZ) package with exposed tab for thermal conduction; body size 14.986 mm × 10.16 mm. No external heat sink required below 50°C ambient when delivering ≤1 A at <12 V output.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Output | Switch node | Connects to inductor and catch diode anode; high dv/dt node requiring minimal PCB copper area to reduce EMI coupling. |
| 2 - +VIN | Power input | Accepts 4.5–40 V; requires low-ESR input capacitor placed close to pin to supply peak switching current and suppress transients. |
| 3 - Error Flag | Open-collector status output | Sinks current when VOUT drops >5% below 12 V; used directly as microcontroller reset signal after delay timing. |
| 4 - Ground | Power and signal reference | Common return for input/output capacitors, feedback divider, and thermal pad; must be low-impedance plane for stability. |
| 5 - Delay | Flag timing control | Capacitor to ground sets delay between VOUT reaching 95% and Error Flag deassertion - enables sequenced power-up. |
| 6 - Feedback | Voltage sense input | Internally referenced to 1.23 V; unused in fixed 12-V version but must be connected per datasheet (typically to GND via resistor). |
| 7 - Shutdown/Soft-start | Control input | Logic-low disables regulator (ISTBY ≈ 85 μA); capacitor to ground provides controlled VOUT ramp-up to limit inrush current. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12-V output with ±4% tolerance | Eliminates external feedback resistor network, reducing BOM count and layout sensitivity while guaranteeing compliance with 12-V logic and analog supply requirements. |
| Integrated soft-start with external capacitor | Configurable output voltage ramp rate prevents input current surges during startup - critical for shared or current-limited power sources. |
| Open-collector error flag with programmable delay | Provides reliable power-good signaling for microcontrollers and FPGAs, with adjustable hold-off time to accommodate output capacitor charging dynamics. |
| Thermal shutdown and peak current limiting | Two-stage protection (1.2–2.4 A current limit + 150°C thermal cutoff) ensures robust operation under short-circuit or overload without external sensing components. |
| 150-kHz fixed-frequency operation | Enables predictable EMI filtering and compatibility with standard magnetic components - simplifies compliance testing and reduces design iteration cycles. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Converting 24-V vehicle battery to regulated 12-V rail for lighting controllers, window lift ECUs, and door module logic. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, efficient, and fault-protected 12-V supply independent of alternator ripple or cold-crank transients. Use Value: Operates down to 4.5 V input, survives load-dump events up to 40 V, and delivers 1 A continuously - meeting ISO 16750-2 automotive electrical stress requirements. |
Use Scenario: Generating stable 12-V supply from 12-V battery for CAN transceivers, LIN bus interfaces, and sensor signal conditioning in body electronics. IC Role / Device Role / Timing Role: Point-of-load regulator with error flag used as hardware reset for microcontrollers during brownout recovery. Use Value: ±4% output accuracy and 90% efficiency at 25-V input ensure consistent communication timing and reduced thermal load in sealed modules. |
| Embedded System Power Management | Test Equipment Auxiliary Rail |
|
Use Scenario: Providing clean 12-V bias for op-amps, ADC drivers, and FPGA I/O banks in portable instrumentation and edge AI gateways. IC Role / Device Role / Timing Role: Secondary regulator following a wide-input front-end, leveraging soft-start to coordinate power sequencing with FPGA configuration. Use Value: 85-μA shutdown current and thermal protection enable safe integration into fanless enclosures with limited airflow and variable ambient temperatures. |
Use Scenario: Delivering precise 12-V output for calibration references, relay drivers, and DUT power in automated test fixtures and bench power supplies. IC Role / Device Role / Timing Role: Fixed-output switching regulator replacing linear regulators to minimize heat dissipation and improve energy efficiency in multi-rail test platforms. Use Value: 150-kHz switching allows compact LC filter design (<10 mm² footprint), and ±4% tolerance meets Class II instrument supply accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596T-12/NOPB | Lower 150-kHz frequency same, but 3-A output rating and higher 45-V max input; uses different pinout (TO-220-5 vs TO-220-7) and lacks Error Flag/Delay pins. | Higher current capability suits heavier loads, but missing status signaling limits use in systems requiring power-good monitoring. | Select LM2596T-12/NOPB only if >1 A output or >40 V input is needed and error flag functionality is unnecessary. |
| TPS54202DRCT | Synchronous buck, 4.5–28 V input, 2-A output, 500-kHz switching, integrated MOSFETs; QFN-10 package; no Error Flag but includes PG pin and enable. | Better efficiency at light loads and smaller solution size, but requires external compensation and lacks built-in soft-start capacitor interface. | Choose TPS54202DRCT for space-constrained designs needing >90% efficiency across 10-mA–2-A load range, accepting added design complexity. |
Compared with LM2596T-12/NOPB and TPS54202DRCT, LM2598T-12/NOPB uniquely combines fixed 12-V output, integrated error flag with programmable delay, TO-220 thermal robustness, and plug-and-play soft-start - making it optimal for cost-sensitive, reliability-critical 1-A industrial and automotive applications where status signaling and simplicity are prioritized over peak efficiency or ultra-small footprint.
Availability
LM2598T-12/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and embedded system point-of-load regulation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2598T-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, designing and manufacturing analog ICs, embedded processors, and power management solutions for industrial, automotive, and consumer markets.
The LM2598 series belongs to TI's SIMPLE SWITCHER® power converter family, engineered for ease of use in non-isolated DC-DC buck applications where minimal external components, robust protection, and fixed-output simplicity are prioritized over programmability or ultra-high efficiency.
FAQ
What is the maximum input voltage rating for LM2598T-12/NOPB?
The absolute maximum input voltage for LM2598T-12/NOPB is 45 V, but the recommended operating range is 4.5 V to 40 V. Operation above 40 V risks exceeding internal device stress limits and may trigger overvoltage protection or cause permanent damage. For automotive applications subject to load dump (up to 60 V), external clamping circuitry is required before the LM2598T-12/NOPB input pin.
Does LM2598T-12/NOPB require external feedback resistors?
No, LM2598T-12/NOPB is a fixed-output variant with internal resistor divider set for 12 V; the Feedback pin is not used for regulation and must be connected per TI's recommended configuration - typically tied to ground through a 10-kΩ resistor as specified in the datasheet to ensure proper biasing and noise immunity.
How does the Error Flag pin function in LM2598T-12/NOPB?
The Error Flag pin on LM2598T-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 - enabling use as a synchronized reset signal for microcontrollers or FPGAs.
Can LM2598T-12/NOPB be used in negative voltage applications?
Yes, LM2598T-12/NOPB supports inverting (positive-to-negative) topologies, such as generating –12 V from a positive input. This requires bootstrapping the GND pin to the negative output and referencing the Feedback pin to ground. The maximum |VIN| + |VOUT| must not exceed 40 V; for example, converting 24 V to –12 V yields 36 V total stress - within rating. A Schottky catch diode and 68-µH inductor are recommended.
What thermal considerations apply to LM2598T-12/NOPB in TO-220 package?
In the TO-220-7 (NDZ) package, LM2598T-12/NOPB has a junction-to-ambient thermal resistance (RθJA) of 50°C/W with no heat sink. At 1 A output and 25 V input, typical power dissipation is ~1.2 W; this results in ~60°C junction rise above ambient - well below the 150°C shutdown threshold. For continuous 1-A operation above 50°C ambient, a small finned heat sink or copper pour is advised.
LM2598T-12/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-7 Formed Leads
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-7
LM2598T-12/NOPB FAQ
1.How can I place an order for LM2598T-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2598T-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 LM2598T-12/NOPB reliable?
The price and inventory of LM2598T-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 LM2598T-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2598T-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2598T-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2598T-12/NOPB?
LM2598T-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2598T-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 LM2598T-12/NOPB?
For technical support, including LM2598T-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2598T-12/NOPB requirements.
6.How does Aetrix verify that LM2598T-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2598T-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 LM2598T-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2598T-12/NOPB?
All LM2598T-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2598T-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 LM2598T-12/NOPB part is unused and in its original packaging.
Return procedure for LM2598T-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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