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Texas Instruments LM2599T-5.0/NOPB
- Part No.:
- LM2599T-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LM2599T-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 3A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:1,908
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Product details
Overview
LM2599T-5.0/NOPB from Texas Instruments is a monolithic 150-kHz nonsynchronous step-down DC-DC converter delivering up to 3 A output current with fixed 5-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 for reliable power conversion in industrial and embedded systems.
For engineers reviewing the LM2599T-5.0/NOPB datasheet, LM2599T-5.0/NOPB pinout, LM2599T-5.0/NOPB application, or LM2599T-5.0/NOPB equivalent, key selection criteria include its 3-A continuous output capability, TO-220-7 package thermal performance, shutdown/soft-start control interface, and error flag signaling for system reset coordination.
Technical Context
The LM2599T-5.0/NOPB implements a fixed-frequency (150 kHz) buck topology with an integrated NPN switch, requiring only external diode, inductor, and capacitors. Its feedback loop uses a precision 1.23-V reference and senses output via internal resistor divider for 5-V regulation.
Functional modes include normal operation, shutdown (80 μA standby), soft-start (capacitor-controlled ramp), and out-of-regulation detection with programmable delay. Protection includes two-stage current limit, thermal shutdown, and undervoltage lockout support via the SD/SS pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over −40°C to +125°C, ensuring stable rail for microcontrollers and analog circuitry. |
| Max Output Current | 3 A DC continuous, supporting high-power loads without external current boosting. |
| Input Voltage Range | 4.5 V to 40 V, enabling direct operation from 12-V, 24-V, or unregulated industrial supplies. |
| Switching Frequency | 150 kHz ±15%, allowing use of standard off-the-shelf inductors and reducing EMI filtering complexity. |
| Quiescent Current | 80 μA in shutdown mode, minimizing standby power in battery-backed or energy-sensitive systems. |
| Efficiency | 80% typical at 12-V input / 3-A load, reducing thermal load and simplifying heatsink requirements. |
| Thermal Resistance | 50°C/W junction-to-ambient (TO-220 vertical mount), defining minimum PCB copper area needed for thermal management. |
Pinout & Package
LM2599T-5.0/NOPB is housed in a 7-pin TO-220 package with tab-connected ground, optimized for vertical heatsinking and through-hole assembly. Pin 1 is +VIN, Pin 2 is Output (switch node), Pin 4 is Ground (tab), and Pin 7 is Shutdown/Soft-start - all electrically and thermally validated per TI SNVS123D.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+VIN) | Positive input supply | Accepts 4.5–40 V; requires local bypass capacitor to handle high di/dt switching currents. |
| 2 (Output) | Internal switch node | Drives external catch diode and inductor; PCB copper area must be minimized to reduce EMI coupling. |
| 3 (Error Flag) | Open-collector fault indicator | Pulls low when output drops >5%; used as microprocessor reset signal after programmable delay. |
| 4 (Ground) | Circuit and thermal reference | Tab-connected to internal die substrate; must be soldered to ≥1 in² copper for thermal compliance. |
| 5 (Delay) | Flag timing control | Connects to capacitor to set delay between output regulation and Error Flag assertion. |
| 6 (Feedback) | Regulation sense input | Internally tied to 5-V divider; not accessible on fixed-output version but referenced internally. |
| 7 (Shutdown/Soft-start) | Control interface | Logic-low (<0.6 V) enables shutdown (80 μA IQ); capacitor adds soft-start ramp to limit inrush current. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated soft-start | Capacitor-programmable output voltage ramp prevents input inrush and stabilizes downstream LDOs. |
| Out-of-regulation error flag | Open-collector output with built-in delay provides deterministic system reset timing during brownout events. |
| Two-stage current limiting | Peak current limit (~4.5 A) and foldback protection prevent damage during short-circuit or overload conditions. |
| Thermal shutdown | Activates at 150°C junction temperature and auto-recovers after cooldown, enabling robust field operation. |
| Fixed-frequency oscillator | 150-kHz internal clock eliminates external timing components and ensures predictable EMI spectrum placement. |
Applications
| Industrial Power Supply | Embedded Microcontroller Rail |
|---|---|
Use Scenario: Converting 24-V factory bus to regulated 5-V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, efficient, and thermally robust 5-V rail. Use Value: Delivers full 3-A load at 80% efficiency with no external compensation, reducing BOM count and layout risk. | Use Scenario: Powering ARM Cortex-M4-based edge nodes with real-time Ethernet and ADC peripherals. IC Role / Device Role / Timing Role: Main system power IC supplying clean 5-V to MCU core and interface logic. Use Value: Soft-start prevents reset glitches during cold boot; error flag synchronizes firmware initialization with power stability. |
| Automotive Body Control Module | Test Equipment Power Stage |
Use Scenario: Generating 5-V from 12-V vehicle battery for lighting controllers and CAN transceivers. IC Role / Device Role / Timing Role: High-reliability buck converter meeting automotive transient and thermal requirements. Use Value: Withstands 40-V load dump pulses; thermal shutdown protects against under-hood overheating. | Use Scenario: Programmable bench supply output stage delivering adjustable 5-V/3-A for DUT powering. IC Role / Device Role / Timing Role: Fixed-output power stage controlled via external enable and monitored via error flag. Use Value: Shutdown pin enables remote on/off control; error flag signals overvoltage/overcurrent faults to host controller. |
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-5.0/NOPB | Lower 1.5-A output current, 150-kHz frequency, TO-220-5 package (no Error Flag or Delay pins). | Lacks error flag and delay functionality; unsuitable where power-good signaling or sequenced startup is required. | Select LM2596T-5.0/NOPB only for cost-sensitive, lower-current designs without fault monitoring needs. |
| MP1584EN-LF-Z | 3-A synchronous buck, 1.5-MHz switching, SOIC-8 package; no integrated error flag or soft-start capacitor interface. | Higher frequency enables smaller magnetics but requires external soft-start circuitry and lacks dedicated fault signaling. | Choose MP1584EN-LF-Z when board space is constrained and external fault handling is acceptable. |
Compared with LM2596T-5.0/NOPB and MP1584EN-LF-Z, the LM2599T-5.0/NOPB uniquely combines 3-A capability, integrated error flag with delay, and soft-start capacitor control in a thermally robust TO-220-7 package-making it optimal for industrial systems requiring reliability, diagnostics, and thermal margin.
Availability
LM2599T-5.0/NOPB is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and automotive body electronics requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2599T-5.0/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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability power conversion ICs.
The LM2599 series belongs to TI's SIMPLE SWITCHER® family, designed specifically for ease-of-use in non-isolated DC-DC buck applications where minimal external components, thermal robustness, and integrated protection are critical.
FAQ
What is the maximum input voltage rating for the LM2599T-5.0/NOPB?
The LM2599T-5.0/NOPB 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 violating thermal and reliability specifications, though brief transients up to 45 V are tolerated per Absolute Maximum Ratings. The LM2599T-5.0/NOPB must be used within these limits to ensure long-term performance and avoid permanent damage.
Does the LM2599T-5.0/NOPB require external compensation components?
No, the LM2599T-5.0/NOPB includes internal frequency compensation and is designed for stable operation with only five external components: input capacitor, output capacitor, catch diode, inductor, and optional soft-start capacitor. Its fixed 150-kHz oscillator and internal loop compensation eliminate the need for external RC networks or compensation pins - a key advantage confirmed in TI's SNVS123D datasheet Section 8.1 and Figure 43.
Can the LM2599T-5.0/NOPB be used in an inverting (positive-to-negative) configuration?
Yes, the LM2599T-5.0/NOPB supports inverting regulator topologies, as documented in TI SNVS123D Section 8.3.2. When configured to generate −5 V, it uses the same internal 5-V reference but re-biases the ground and feedback connections. This requires an additional Schottky diode and specific inductor selection (e.g., 33 μH), and the LM2599T-5.0/NOPB's maximum input+|output| voltage must remain ≤40 V.
What thermal management is required for the LM2599T-5.0/NOPB at full 3-A load?
At 3-A output and 12-V input, the LM2599T-5.0/NOPB dissipates ~3.6 W. With a TO-220 package RθJA of 50°C/W (vertical mount, 1 in² copper), junction temperature rise is ~180°C above ambient - exceeding the 150°C max. Therefore, a heatsink or ≥2 in² copper pour is mandatory. TI specifies 50°C/W only with "1 in² of 1-oz copper" as a baseline; actual design must verify thermal margin using measured η and RθJC values from SNVS123D Section 7.4.
Is the LM2599T-5.0/NOPB RoHS compliant and lead-free?
Yes, the LM2599T-5.0/NOPB is RoHS compliant and lead-free, as indicated by the "/NOPB" suffix per Texas Instruments' packaging nomenclature. TI's official product folder and orderable addendum confirm Pb-Free (RoHS) status, and the device meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for surface-mount assembly - though the TO-220 package is typically through-hole mounted.
LM2599T-5.0/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):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- 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
LM2599T-5.0/NOPB FAQ
1.How can I place an order for LM2599T-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2599T-5.0/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 LM2599T-5.0/NOPB reliable?
The price and inventory of LM2599T-5.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2599T-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2599T-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2599T-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2599T-5.0/NOPB?
LM2599T-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2599T-5.0/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 LM2599T-5.0/NOPB?
For technical support, including LM2599T-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2599T-5.0/NOPB requirements.
6.How does Aetrix verify that LM2599T-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2599T-5.0/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 LM2599T-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2599T-5.0/NOPB?
All LM2599T-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2599T-5.0/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 LM2599T-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2599T-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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