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Texas Instruments LM2595SX-12
- Part No.:
- LM2595SX-12
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2595SX-12.pdf
- Description:
- IC REG BUCK 12V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:2,463
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Product details
Overview
LM2595SX-12 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% tolerance over line and load, 4.5–40 V input range, and integrated thermal shutdown/current limit protection. It serves as an efficient on-card switching regulator in industrial power supplies and embedded systems requiring stable mid-power conversion.
For engineers reviewing the LM2595SX-12 datasheet, LM2595SX-12 pinout, LM2595SX-12 application, or LM2595SX-12 equivalent, key selection criteria include its fixed 12 V output accuracy, TO-263-5 surface-mount package thermal performance, 1-A continuous load capability without heatsink below 50°C ambient, and TTL-compatible ON/OFF control with 85 μA standby current.
Technical Context
The LM2595SX-12 integrates a PWM controller, power switch, and internal frequency compensation operating at a fixed 150 kHz switching frequency-enabling compact external filter components. Its nonsynchronous architecture uses an external catch diode and requires only four external components: input capacitor, output capacitor, inductor, and feedback resistor network (not needed for fixed-output versions).
It implements two-stage current limiting (peak and foldback), thermal shutdown at ~150°C junction temperature, and undervoltage lockout via the ON/OFF pin. The feedback pin is internally connected to a 1.23 V reference for fixed-output variants, eliminating external resistor dividers.
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 trimming. |
| Max output current | 1 A DC continuous - supports mid-power loads like sensors, displays, and interface ICs without external current boosting. |
| Input voltage range | 4.5 V to 40 V - accommodates wide-input industrial, automotive, and battery-backed systems including 24 V nominal rails. |
| Switching frequency | 150 kHz (±15%) - enables use of low-cost, standard off-the-shelf inductors and reduces EMI compared to higher-frequency alternatives. |
| Standby quiescent current | 85 μA typical at 25°C - minimizes system power draw during sleep modes in battery-powered applications. |
| Thermal resistance θJA | 30 °C/W (with 2.5 in² copper) - allows operation at full 1 A load without heatsink at ≤50°C ambient in standard PCB layouts. |
| Oscillator tolerance | ±15% over temperature - provides predictable timing for EMI filtering and layout design without requiring frequency calibration. |
Pinout & Package
LM2595SX-12 is housed in a 5-pin TO-263 (KTT) surface-mount package with exposed thermal pad (10.16 mm × 8.42 mm body size). The package supports high-current PCB routing and direct thermal coupling to copper planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Output | Switch node | Drives external catch diode and inductor; voltage swings between (VIN − VSAT) and ~−0.5 V; requires minimal PCB copper area to reduce EMI coupling. |
| 2 - +VIN | Power input | Accepts 4.5–40 V DC; must be bypassed with low-ESR capacitor near pin to supply peak switching current and suppress transients. |
| 3 - Ground | Power and signal reference | Common return for internal circuitry, switch, and external components; connects to thermal pad for heat dissipation. |
| 4 - Feedback | Voltage sense input | Internally tied to 1.23 V reference; unused in fixed 12 V version - left unconnected per datasheet guidance. |
| 5 - ON/OFF | Logic enable/disable | TTL-compatible shutdown control: <1.3 V = ON, >1.3 V = OFF; draws <200 μA in shutdown; can be grounded or left open for always-on operation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12 V output | Eliminates external feedback resistors - reduces BOM count, layout complexity, and calibration drift in production. |
| Integrated thermal shutdown | Protects against sustained overload or poor heatsinking by disabling switching above ~150°C junction temperature. |
| Two-stage current limiting | Prevents damage during short-circuit events: first stage limits peak switch current to ~1.5 A; second stage reduces frequency under overload. |
| Low-standby IQ | 85 μA typical shutdown current enables long battery life in intermittent-operation systems like remote sensors. |
| Self-compensated control loop | Requires no external compensation components - simplifies design validation and improves stability across manufacturing variance. |
Applications
| Industrial Power Supply | Embedded Microcontroller Rail |
|---|---|
Use Scenario: Converting 24 V factory bus voltage to regulated 12 V for PLC I/O modules and motor drivers. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, ripple-controlled 12 V rail with built-in fault protection. Use Value: Delivers full 1 A at 90% efficiency (VIN=25 V, IOUT=1 A), reducing thermal load and enabling compact enclosure designs without forced air cooling. | Use Scenario: Generating clean 12 V supply for FPGA configuration circuits and analog front-ends in edge computing gateways. IC Role / Device Role / Timing Role: On-board buck converter supplying stable voltage to noise-sensitive mixed-signal subsystems. Use Value: Fixed 12 V ±4% accuracy and 150 kHz fixed-frequency operation simplify EMI filtering and ensure consistent timing margins for digital logic. |
| Automotive Body Control | Test & Measurement Equipment |
Use Scenario: Regulating 12 V battery-derived input (9–16 V) to stable 12 V output for lighting controllers and window lift ECUs. IC Role / Device Role / Timing Role: Input-tolerant buck regulator maintaining output during cold-crank (down to 4.5 V) and load-dump transients. Use Value: Wide 4.5–40 V input range and thermal shutdown allow direct connection to vehicle battery without pre-regulation stages. | Use Scenario: Providing calibrated 12 V bias for precision op-amps and ADC references in portable multimeters and signal analyzers. IC Role / Device Role / Timing Role: Low-noise, high-stability DC-DC source replacing linear regulators to improve efficiency and reduce thermal drift. Use Value: 85 μA standby current and ±4% output tolerance support battery-operated portability while meeting metrology-grade voltage stability 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 |
|---|---|---|---|
| LM2596SX-12 | Higher 150 kHz oscillator accuracy (±10% vs ±15%), improved line regulation (0.2% vs 0.5%), and lower dropout voltage (3 V vs 4.5 V min VIN). | Better suited for low-input-voltage applications and tighter output tolerance requirements. | Select LM2596SX-12 when input voltage may dip below 6 V or when output stability under rapid line changes is critical. |
| MP1584EN-LF-Z | Higher 1.5 MHz switching frequency, smaller external components, but requires external compensation and lacks integrated thermal shutdown latch. | Enables ultra-compact designs but increases design complexity and reduces fault coverage. | Choose MP1584EN-LF-Z only when board space is constrained and design teams have expertise in high-frequency buck loop compensation. |
Compared with LM2596SX-12, LM2595SX-12 offers broader input range (4.5–40 V vs 4.5–40 V) and simpler implementation, while MP1584EN-LF-Z trades robustness and ease-of-use for miniaturization-making LM2595SX-12 optimal for cost-sensitive, thermally demanding industrial applications where reliability trumps size.
Availability
LM2595SX-12 is available at Aetrix Electronics and suitable for industrial power supplies, embedded microcontroller rails, and automotive body control modules requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LM2595SX-12 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 experience in high-reliability power conversion solutions.
The LM2595 series belongs to TI's SIMPLE SWITCHER® portfolio-designed specifically for engineers needing robust, easy-to-implement DC-DC converters with minimal external components and proven thermal performance in harsh environments.
FAQ
What is the minimum input voltage required for LM2595SX-12 to regulate 12 V output?
The LM2595SX-12 requires a minimum input voltage of 4.5 V to maintain regulation, though practical dropout is ~3 V due to internal saturation voltage. At 1 A load, VIN must exceed ~15.2 V to sustain 12 V output given the 1.2 V typical switch saturation drop. Full 1 A operation is guaranteed from 15 V to 40 V per datasheet test conditions.
Does LM2595SX-12 require an external feedback resistor network?
No. The LM2595SX-12 is a fixed-output variant with internal resistor divider tied to the 1.23 V reference. Pin 4 (Feedback) is not connected in standard operation-leaving it unconnected or floating is correct per TI's datasheet guidance for fixed-voltage versions.
Can LM2595SX-12 operate without a heatsink in a 1 A, 24 V input application?
Yes. With ≥2.5 in² of 1 oz copper on the PCB connected to the thermal pad, the LM2595SX-12 achieves θJA = 30 °C/W. At 1 A and 24 V input, power dissipation is ~12 W × (1 − 0.9) = 1.2 W, resulting in ~36°C rise above ambient-well within safe limits below 50°C ambient, eliminating need for external heatsink.
What protection features are integrated into LM2595SX-12?
The LM2595SX-12 integrates thermal shutdown (activates at ~150°C junction temperature), two-stage current limiting (peak limit ~1.5 A, foldback under sustained overload), and undervoltage lockout via the ON/OFF pin. It does not include output overvoltage or reverse-polarity protection-those must be implemented externally.
Is LM2595SX-12 RoHS compliant and lead-free?
Yes. LM2595SX-12 is manufactured in TI's RoHS-compliant, lead-free TO-263 (KTT) package per JEDEC J-STD-020 moisture sensitivity level 3, with Pb-free terminations and halogen-free molding compound-fully compliant with EU RoHS Directive 2011/65/EU and China RoHS.
LM2595SX-12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- 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):
- 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-5)
LM2595SX-12 FAQ
1.How can I place an order for LM2595SX-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2595SX-12 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 LM2595SX-12 reliable?
The price and inventory of LM2595SX-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2595SX-12 is usually 5 days.
3.What payment methods are accepted for LM2595SX-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2595SX-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2595SX-12?
LM2595SX-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2595SX-12 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 LM2595SX-12?
For technical support, including LM2595SX-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2595SX-12 requirements.
6.How does Aetrix verify that LM2595SX-12 is sourced from the original manufacturer or authorized distributors?
All LM2595SX-12 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 LM2595SX-12 meets industry standards.
7.What is the process for return or replacement of LM2595SX-12?
All LM2595SX-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2595SX-12, 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 LM2595SX-12 part is unused and in its original packaging.
Return procedure for LM2595SX-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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