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Texas Instruments LM2599S-3.3/NOPB
- Part No.:
- LM2599S-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2599S-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:220
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Product details
Overview
LM2599S-3.3/NOPB from Texas Instruments is a monolithic 150-kHz nonsynchronous step-down DC-DC converter delivering up to 3 A output current with fixed 3.3-V output, ±4% output voltage tolerance over line and load, input voltage range up to 40 V, and integrated thermal shutdown and current-limit protection. It serves as a primary buck regulator in industrial power supplies and embedded system rails.
For engineers reviewing the LM2599S-3.3/NOPB datasheet, LM2599S-3.3/NOPB pinout, LM2599S-3.3/NOPB application, or LM2599S-3.3/NOPB equivalent, key selection criteria include its 3-A continuous output capability, 80-μA standby quiescent current, soft-start/shutdown dual-function pin, error flag with delay timing, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2599S-3.3/NOPB implements a fixed-frequency (150 kHz) pulse-width modulation architecture with internal frequency compensation and a single N-channel DMOS power switch. Its feedback loop uses a precision 1.23-V reference and senses output via the Feedback pin, enabling stable regulation without external compensation components.
It supports three functional modes: normal operation, shutdown (reducing IQ to 80 μA), and soft-start (controlled by capacitor on Shutdown/Soft-start pin). The Error Flag pin provides open-collector undervoltage detection with built-in 5% dropout threshold and programmable delay via external capacitor on the Delay pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over –40°C to 125°C, ensuring reliable rail generation for 3.3-V logic and microcontrollers. |
| Max Output Current | 3 A DC continuous, supporting high-current loads such as FPGAs, DSPs, or multiple peripheral ICs without external current boosting. |
| Input Voltage Range | 4.5 V to 40 V, enabling direct use with 5-V, 12-V, 24-V, and unregulated wall adapters or battery stacks. |
| Switching Frequency | 150 kHz (±15%), allowing use of compact, low-cost through-hole or surface-mount inductors with minimal EMI filtering. |
| Quiescent Current | 80 μA in shutdown mode, minimizing standby power loss in battery-backed or energy-sensitive systems. |
| Efficiency | 73% at VIN = 12 V, IOUT = 3 A, defining realistic power-conversion performance under full-load conditions. |
| Thermal Protection | Internal thermal shutdown at 150°C junction temperature, preventing damage during overload or poor heatsinking. |
Pinout & Package
LM2599S-3.3/NOPB is supplied in a 7-pin TO-263 (KTW) surface-mount package with exposed thermal pad, measuring 10.10 mm × 8.89 mm, optimized for PCB thermal relief and high-current routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VIN | Power Input | Accepts 4.5–40 V supply; requires local ceramic bypass capacitor to handle high di/dt switching currents. |
| Output | Switch Node | Drives external catch diode and inductor; voltage swings between ~(+VIN − 1.4 V) and –0.5 V; demands minimal copper area to reduce EMI. |
| Error Flag | Open-Collector Status | Pulls low when VOUT drops >5% below 3.3 V; used for MCU reset assertion after power-up delay set by Delay pin capacitor. |
| Ground | Reference Node | Common return for control circuitry and power stage; must be connected to low-impedance ground plane adjacent to thermal pad. |
| Delay | Timing Control | Sets error flag assertion delay via external capacitor; enables sequencing or hold-off before system initialization. |
| Feedback | Voltage Sense | Monitors regulated output via resistive divider; internally references 1.23 V; not connected in fixed-output versions but internally tied. |
| Shutdown/Soft-start | Control Input | Logic-low disables regulator (IQ ≈ 80 μA); capacitor here controls output voltage ramp rate during startup to limit inrush. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Switch | Single N-channel DMOS transistor rated for 3-A continuous current and 40-V max input, eliminating need for external MOSFET driver or gate control. |
| Fixed-Frequency PWM | 150-kHz oscillator enables predictable filter design, consistent EMI profile, and simplified input/output capacitor selection across designs. |
| Soft-Start + Shutdown | Dual-function pin reduces peak inrush current (e.g., from 2.6 A to 650 mA) and allows logic-controlled enable/disable with <100-μA standby draw. |
| Out-of-Regulation Detection | Open-collector Error Flag with 5% dropout threshold and user-programmable delay ensures robust power-good signaling for system-level sequencing. |
| Thermal & Current Protection | Two-stage current limiting and thermal shutdown prevent failure under short-circuit, overload, or inadequate heatsinking-no external fault-handling circuitry required. |
Applications
| Industrial PLC Power Rail | Embedded Microcontroller Supply |
|---|---|
Use Scenario: Providing stable 3.3-V power to ARM Cortex-M4-based controllers and I/O modules in programmable logic controllers operating from 24-V DC field buses. IC Role / Device Role / Timing Role: Primary buck regulator converting 24-V bus to isolated 3.3-V logic rail with tight regulation and fault reporting. Use Value: Delivers 3 A continuously while maintaining ±4% output accuracy across –40°C to 85°C ambient, enabling reliable real-time control without external supervision. | Use Scenario: Powering FPGA configuration circuits, USB PHYs, and sensor interfaces in portable test equipment with limited board space and thermal budget. IC Role / Device Role / Timing Role: Compact, self-contained step-down converter replacing linear regulators to improve efficiency and reduce heat dissipation. Use Value: Achieves 73% efficiency at full load and draws only 80 μA in shutdown-extending battery life and simplifying thermal design. |
| Automotive Body Control Module | Point-of-Load Converter for Industrial Sensors |
Use Scenario: Generating 3.3-V supply for CAN transceivers and microcontrollers in body electronics modules powered from 12-V vehicle battery with load-dump transients. IC Role / Device Role / Timing Role: Robust buck regulator with 40-V input rating and thermal/current protection handling automotive voltage extremes. Use Value: Withstands 40-V max input and includes built-in overtemperature shutdown, reducing need for external TVS or thermal monitoring. | Use Scenario: Delivering clean 3.3-V power to high-precision analog sensors (e.g., strain gauges, RTDs) in factory automation systems with noisy 24-V plant power. IC Role / Device Role / Timing Role: Low-noise, well-regulated point-of-load converter with error flag used for sensor health monitoring. Use Value: ±4% output tolerance and open-collector error flag provide deterministic fault signaling to host controller during sensor calibration or diagnostics. |
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-3.3/NOPB | Lower 1.5-A output current, 150-kHz frequency, same pinout and package, but no Error Flag or Delay pin functionality. | Lacks out-of-regulation detection and programmable delay-unsuitable where power-good sequencing or fault reporting is required. | Select LM2596S-3.3/NOPB only for cost-sensitive, lower-current applications without status signaling needs. |
| TPS54302DDAR | 3-A synchronous buck with 2.5–6-V input range, 2-MHz switching, integrated high-side/low-side MOSFETs, and enable/PG pins-but no Error Flag delay feature. | Requires external compensation and operates at higher frequency; better suited for space-constrained, low-input-voltage designs-not drop-in for 12–40-V inputs. | Choose TPS54302DDAR for higher efficiency above 2.5 V input and smaller magnetics, but verify layout and compensation for new design. |
Compared with LM2596S-3.3/NOPB, LM2599S-3.3/NOPB delivers double the output current and adds critical fault-reporting features; versus TPS54302DDAR, it supports wider input range and simpler implementation but trades off switching frequency and synchronous efficiency.
Availability
LM2599S-3.3/NOPB is available at Aetrix Electronics and suitable for industrial PLC power rails, embedded microcontroller supplies, and automotive body control modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2599S-3.3/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® portfolio-designed specifically for ease-of-use, minimal external component count, and robust operation in industrial, automotive, and embedded power applications.
FAQ
What is the maximum input voltage rating for LM2599S-3.3/NOPB?
The LM2599S-3.3/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 during normal operation risks violating safe operating area limits, especially under transient conditions like load dump in automotive systems. Always include appropriate input clamping or filtering when operating near the upper limit.
Does LM2599S-3.3/NOPB require an external feedback resistor network?
No, LM2599S-3.3/NOPB does not require external feedback resistors because it is a fixed-output version with internal resistor divider set to 3.3 V. The Feedback pin is internally connected and must not be externally loaded or modified-doing so will disrupt regulation accuracy and may cause instability.
How does the Error Flag pin function on LM2599S-3.3/NOPB?
The Error Flag pin on LM2599S-3.3/NOPB is an open-collector output that pulls low when the regulated 3.3-V output falls more than 5% below nominal (i.e., below 3.135 V). It remains low until VOUT reaches 95% of target and the Delay pin capacitor charges-enabling precise power-good timing for microprocessor reset assertion.
Can LM2599S-3.3/NOPB be used in a negative-output inverting configuration?
Yes, LM2599S-3.3/NOPB can be configured as an inverting regulator to generate a negative output (e.g., –3.3 V) using the topology shown in TI's application note SNVA230. This requires re-referencing the ground and feedback connections, adding an isolation diode, and selecting appropriate inductor/capacitor values-though output current capability decreases with increasing |VIN| + |VOUT|.
What thermal considerations apply to LM2599S-3.3/NOPB in TO-263 package?
In the TO-263 (KTW) package, LM2599S-3.3/NOPB achieves 20°C/W junction-to-ambient thermal resistance when mounted on a double-sided PCB with 3 in² of 1-oz copper on the component side and ~16 in² on the opposite side. Adequate copper pour under the thermal pad and solder mask defined for thermal relief are essential to maintain ≤125°C junction temperature at full 3-A load.
LM2599S-3.3/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):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- 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)
LM2599S-3.3/NOPB FAQ
1.How can I place an order for LM2599S-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2599S-3.3/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 LM2599S-3.3/NOPB reliable?
The price and inventory of LM2599S-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2599S-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2599S-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2599S-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2599S-3.3/NOPB?
LM2599S-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2599S-3.3/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 LM2599S-3.3/NOPB?
For technical support, including LM2599S-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2599S-3.3/NOPB requirements.
6.How does Aetrix verify that LM2599S-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2599S-3.3/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 LM2599S-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2599S-3.3/NOPB?
All LM2599S-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2599S-3.3/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 LM2599S-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2599S-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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