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Texas Instruments LM2595S-3.3
- Part No.:
- LM2595S-3.3
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2595S-3.3.pdf
- Description:
- IC REG BUCK 3.3V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:2,513
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Product details
Overview
LM2595S-3.3 from Texas Instruments is a monolithic 150-kHz nonsynchronous step-down DC-DC converter delivering up to 1 A output current with ±4% output voltage accuracy at 3.3 V, operating from 4.5 V to 40 V input, and featuring TTL-compatible ON/OFF control and thermal shutdown protection. It serves as a primary buck regulator in industrial power supplies, embedded system rails, and point-of-load conversion where compact size and minimal external components are critical.
For engineers reviewing the LM2595S-3.3 datasheet, LM2595S-3.3 pinout, LM2595S-3.3 application, or LM2595S-3.3 equivalent, key selection criteria include its fixed 3.3-V output, 1-A load capability, TO-263 package thermal performance, and compatibility with standard off-the-shelf inductors and catch diodes in buck topologies.
Technical Context
The LM2595S-3.3 integrates a PWM controller, power switch, and internal frequency compensation in a single IC. Its fixed 150-kHz oscillator enables predictable filter design using low-cost, widely available 100–330 µH inductors and ceramic or tantalum output capacitors.
It operates in continuous conduction mode by default but supports discontinuous mode at light loads, with built-in two-stage current limiting and thermal shutdown ensuring robust fault protection without external circuitry. The feedback pin senses output directly (no resistor divider), and the ON/OFF pin accepts logic-level signals for enable/disable control with 85 µA standby current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over line, load, and temperature (–40°C to +125°C) |
| Max Output Current | 1 A DC continuous - sufficient for microcontroller cores, FPGAs, and interface ICs |
| Input Voltage Range | 4.5 V to 40 V - supports 5 V, 12 V, 24 V, and 36 V industrial bus inputs |
| Switching Frequency | 150 kHz (±15%) - enables use of low-cost, non-high-frequency inductors and reduces EMI filtering complexity |
| Efficiency | 78% typical at VIN = 12 V, IOUT = 1 A - minimizes thermal load in enclosed environments |
| Standby Current | 85 µA typical - enables low-power sleep modes in battery-backed systems |
| Thermal Shutdown | Active at TJ ≥ 150°C - protects device during overload or poor heatsinking |
Pinout & Package
LM2595S-3.3 is supplied in a 5-pin TO-263 (KTT) surface-mount package with exposed thermal pad (10.16 mm × 8.42 mm nominal body size), optimized for PCB heat dissipation without mandatory heatsink below 50°C ambient and <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 copper area to reduce EMI coupling |
| 2 - +VIN | Power input | Accepts 4.5–40 V supply; requires local low-ESR bypass capacitor (≥100 µF) placed adjacent to pin |
| 3 - Ground | Power and signal reference | Common return for input/output capacitors, inductor, and feedback network; must connect to thermal pad for optimal thermal performance |
| 4 - Feedback | Regulation sense | Internally referenced to 1.23 V; connected directly to output for fixed 3.3-V version - no external resistors needed |
| 5 - ON/OFF | Enable control | TTL-compatible logic input: <1.3 V = ON, >1.3 V = OFF; draws ≤200 µA in shutdown - supports microcontroller GPIO control |
Key Features
| Feature | Design Value |
|---|---|
| Fixed-output architecture | Eliminates feedback resistor selection and layout sensitivity - ensures consistent 3.3-V regulation across production units |
| Integrated thermal shutdown | Automatically disables switching when junction temperature exceeds 150°C, preventing permanent damage under sustained overload |
| Low quiescent current | 85 µA standby draw enables >1-year battery life in always-on monitoring nodes powered by coin cells or supercaps |
| Single-inductor buck topology | Requires only four external components (inductor, diode, input cap, output cap) - reduces BOM cost and board space vs. linear regulators |
| 150-kHz fixed oscillator | Enables use of inexpensive, high-saturation-current shielded inductors instead of costly high-frequency magnetics |
Applications
| Industrial PLC I/O Modules | Embedded Microcontroller Power Rails |
|---|---|
Use Scenario: Providing stable 3.3-V supply to digital isolators, ADCs, and CAN transceivers in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24-V DC field bus to isolated 3.3-V logic rail. Use Value: Delivers 1-A peak current during burst-mode communications while maintaining ±4% regulation across –25°C to +70°C operating range. | Use Scenario: Powering ARM Cortex-M4 microcontrollers and associated peripherals in portable test equipment. IC Role / Device Role / Timing Role: Main system regulator supplying core voltage and I/O banks from a 9-V or 12-V battery pack. Use Value: Achieves 78% efficiency at full load, reducing thermal stress and extending runtime versus linear alternatives. |
| Point-of-Load Converters on Motor Drive Boards | Pre-regulator for Linear LDOs |
Use Scenario: Generating clean 3.3-V supply near FPGA configuration memory and SERDES interfaces on high-noise motor control PCBs. IC Role / Device Role / Timing Role: Local buck converter minimizing IR drop and noise coupling via short trace routing from output pin to load. Use Value: TO-263 thermal pad allows direct mounting to inner ground plane, achieving ≤30°C/W junction-to-ambient resistance with 2.5 in² copper area. | Use Scenario: Reducing 24-V industrial input to ~5 V before feeding low-noise LDOs for analog sensor front-ends. IC Role / Device Role / Timing Role: High-efficiency preregulator lowering power dissipation and thermal load on downstream linear regulators. Use Value: Enables >90% overall system efficiency when paired with 3.3-V LDOs, avoiding excessive heat generation in sealed enclosures. |
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 | Higher 150-kHz oscillator tolerance (±15% vs. ±15%), identical pinout and 1-A rating, but improved line regulation (0.2% vs. 0.5%) | Better suited for wide-input-voltage applications with tight output stability requirements | Select LM2596S-3.3 when output voltage drift under varying input must be minimized |
| MP1584EN-LF-Z | Higher 1.5-MHz switching frequency, smaller external components, but lower 3-A max current and different pinout | Preferred for space-constrained designs needing ultra-compact filter footprints | Choose MP1584EN-LF-Z only if PCB area is critical and thermal management supports higher switching losses |
Compared with LM2596S-3.3, the LM2595S-3.3 offers proven long-term reliability and broader temperature support (–40°C to +125°C vs. –40°C to +85°C), while MP1584EN-LF-Z trades thermal robustness for footprint reduction - making LM2595S-3.3 optimal for industrial environments demanding ruggedness over miniaturization.
Availability
LM2595S-3.3 is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and motor control applications requiring stable component supply, long-lifecycle assurance, and traceable sourcing.
Supply support for LM2595S-3.3 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 LM2595 series belongs to TI's SIMPLE SWITCHER® portfolio, designed specifically for ease-of-use in cost-sensitive, medium-power DC-DC applications where minimal external components and robust thermal behavior are essential.
FAQ
What is the maximum input voltage supported by the LM2595S-3.3?
The LM2595S-3.3 supports a maximum input voltage of 40 V under recommended operating conditions, with absolute maximum rating at 45 V. Operation above 40 V risks exceeding thermal limits or triggering internal protection circuits, so designs should maintain VIN ≤ 40 V for reliable long-term performance. This makes the LM2595S-3.3 suitable for 24-V and 36-V industrial bus systems.
Does the LM2595S-3.3 require external feedback resistors?
No, the LM2595S-3.3 does not require external feedback resistors because it is a fixed-output variant with internal voltage reference and feedback network configured for 3.3 V. Pin 4 (Feedback) connects directly to the output node, eliminating resistor tolerance errors and layout sensitivity - a key advantage over adjustable versions like LM2595ADJ.
Can the LM2595S-3.3 be used in a negative-output (inverting) configuration?
Yes, the LM2595S-3.3 can be configured as a positive-to-negative inverter by re-biasing the ground pin to the negative output rail and grounding the feedback pin, as documented in TI's application notes. However, this topology changes startup behavior and requires additional diodes (D1, D3) and modified inductor selection - the LM2595S-3.3 itself remains unchanged in function.
What thermal performance can be expected from the LM2595S-3.3 in TO-263 package?
In the TO-263 (KTT) package, the LM2595S-3.3 achieves a junction-to-ambient thermal resistance (RθJA) of 30°C/W with 2.5 in² of 1-oz copper area, and 20°C/W on double-sided boards with 3 in² copper. At 1-A load and 12-V input, typical power dissipation is ~2.2 W, resulting in ~66°C junction rise above ambient - well within the 125°C max operating limit without forced air or heatsink.
Is the LM2595S-3.3 RoHS compliant and lead-free?
Yes, the LM2595S-3.3 is RoHS compliant and lead-free per TI's official packaging documentation. The TO-263 package uses matte tin lead finish, and all materials meet JEDEC J-STD-020 moisture sensitivity level (MSL) 3 requirements. Full compliance data is available in TI's Quality & Environmental Information portal under part number LM2595S-3.3.
LM2595S-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 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-5)
LM2595S-3.3 FAQ
1.How can I place an order for LM2595S-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2595S-3.3 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 LM2595S-3.3 reliable?
The price and inventory of LM2595S-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2595S-3.3 is usually 5 days.
3.What payment methods are accepted for LM2595S-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2595S-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2595S-3.3?
LM2595S-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2595S-3.3 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 LM2595S-3.3?
For technical support, including LM2595S-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2595S-3.3 requirements.
6.How does Aetrix verify that LM2595S-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2595S-3.3 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 LM2595S-3.3 meets industry standards.
7.What is the process for return or replacement of LM2595S-3.3?
All LM2595S-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2595S-3.3, 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 LM2595S-3.3 part is unused and in its original packaging.
Return procedure for LM2595S-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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