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Texas Instruments LM2595SX-ADJ
- Part No.:
- LM2595SX-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2595SX-ADJ.pdf
- Description:
- IC REG BUCK ADJ 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:3,533
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Product details
Overview
LM2595SX-ADJ from Texas Instruments is a monolithic nonsynchronous step-down DC-DC converter IC designed as the core switching regulator in compact, high-efficiency power supplies. It delivers up to 1 A output current, supports input voltages up to 40 V, regulates adjustable output from 1.2 V to 37 V (±4% tolerance), and operates at a fixed 150-kHz switching frequency - enabling use with standard off-the-shelf inductors in industrial and embedded power rails.
For engineers reviewing the LM2595SX-ADJ datasheet, LM2595SX-ADJ pinout, LM2595SX-ADJ application, or LM2595SX-ADJ equivalent, key selection criteria include its 1-A load capability, ±4% output voltage accuracy over line/load/temperature, TTL-compatible ON/OFF control with 85-μA standby current, thermal shutdown protection, and compatibility with TO-263-5 surface-mount layout.
Technical Context
The LM2595SX-ADJ integrates a PWM controller, power switch, and internal frequency compensation in a single chip. Its fixed 150-kHz oscillator enables predictable filter design and reduces EMI compared to variable-frequency alternatives. The device uses external feedback resistors to set output voltage and relies on an external catch diode, inductor, and input/output capacitors for full operation.
It implements two-stage current limiting (peak and foldback) plus thermal shutdown for fault protection. The ON/OFF pin provides logic-level shutdown with 1.3-V threshold and sub-200-μA standby quiescent current, supporting low-power system states without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1 A DC - supports medium-power rails without external current boosting |
| Input Voltage Range | 4.5 V to 40 V - accommodates wide-input industrial, automotive, and adapter-fed systems |
| Output Voltage Range | 1.2 V to 37 V (adjustable) - configured via external resistor divider; ±4% max error ensures stable regulation |
| Switching Frequency | 150 kHz (±15%) - enables use of low-cost, standard inductors and simplifies EMI filtering |
| Feedback Voltage | 1.23 V (typical), 1.18–1.28 V (over temp) - sets precision reference for external resistor-based output programming |
| Standby Quiescent Current | 85 μA (typ), ≤250 μA (max over temp) - enables ultra-low-power shutdown mode for battery-backed or energy-sensitive designs |
| Saturation Voltage | 1.2 V (typ) at 1 A - defines conduction loss in internal NPN switch; impacts efficiency at low VIN/VOUT ratios |
| Oscillator Accuracy | ±15% - allows conservative filter design margins without requiring frequency trimming |
Pinout & Package
LM2595SX-ADJ 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). The package supports PCB thermal relief via the tab and is rated for 125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Output | Switch node | Internal NPN collector; swings between (VIN − VSAT) and ~−0.5 V; requires minimal copper area to reduce EMI coupling |
| 2 - +VIN | Power input | Main supply input (4.5–40 V); must be bypassed with low-ESR capacitor near pin to handle pulsed switch current |
| 3 - Ground | Reference return | Common return for internal circuitry and external components; connects to thermal pad for heat dissipation |
| 4 - Feedback | Voltage sense input | High-impedance (≤50 nA bias) input referenced to 1.23 V; connects to resistor divider from output to set regulated voltage |
| 5 - ON/OFF | Logic enable | TTL-compatible shutdown control; <1.3 V = ON, >1.3 V = OFF; draws ≤15 μA when high, supports simple microcontroller interfacing |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1-A NPN switch | Eliminates need for external power transistor; reduces BOM count and layout complexity |
| Fixed 150-kHz oscillator | Enables consistent filter sizing and predictable EMI behavior without external timing components |
| Thermal shutdown + current limit | Provides autonomous fault recovery under overload or ambient overheating without external protection circuitry |
| Low 85-μA standby IQ | Supports energy-efficient system sleep modes while retaining fast wake-up capability |
| Requires only 4 external parts | Minimal bill-of-materials: diode, inductor, input cap, output cap - accelerates prototyping and reduces cost |
| ±4% output voltage accuracy | Meets tight regulation requirements for analog, sensor, and MCU supply rails without post-regulation |
Applications
| Industrial Power Supply | Embedded System Rail |
|---|---|
Use Scenario: Generating 3.3 V or 5 V from a 12–24 V DC bus in programmable logic controllers or remote I/O modules. IC Role / Device Role / Timing Role: Primary buck regulator providing stable, efficient, and thermally robust local power conversion. Use Value: Delivers 1 A at >80% efficiency with no heatsink required below 50°C ambient - reducing board space and thermal management overhead. | Use Scenario: Powering microcontrollers, FPGAs, and peripherals in portable test equipment or edge gateways. IC Role / Device Role / Timing Role: Adjustable-output step-down regulator enabling flexible voltage scaling across multiple subsystems. Use Value: 1.2–37 V output range and ±4% accuracy support diverse rail requirements using one footprint - simplifying inventory and design reuse. |
| Positive-to-Negative Converter | Preregulator for Linear Regulators |
Use Scenario: Generating −5 V or −12 V from a positive input in instrumentation amplifiers or data acquisition front-ends. IC Role / Device Role / Timing Role: Inverting topology configuration using bootstrapped ground and feedback referencing. Use Value: Enables bipolar supply generation without dedicated inverting ICs; leverages same layout and component set as buck mode. | Use Scenario: Reducing 24 V or 36 V input to ~6 V before LDO regulation for noise-sensitive analog circuits. IC Role / Device Role / Timing Role: High-efficiency preregulator minimizing power dissipation and thermal stress on downstream linear regulators. Use Value: Achieves >90% efficiency at 12 V → 3 V conversion - cutting heat generation by >5× versus direct LDO dropout from high input. |
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-ADJ | Higher 3-A output rating, 150-kHz frequency, improved line/load regulation (±1.5%), integrated diode not present - same pinout and external component count | Better suited for higher-current loads (>1.2 A) or tighter regulation needs; requires same PCB layout but larger inductor/capacitor ratings | Select LM2596SX-ADJ when output current exceeds 1 A or regulation tolerance must be <±2% |
| MP1584EN-LF-Z | 2-A rating, 1.5-MHz switching frequency, smaller external components, no integrated thermal pad - different pinout and package (SOIC-8) | Preferred for space-constrained designs needing higher frequency and lower profile; requires layout redesign and new BOM | Choose MP1584EN-LF-Z for compact, high-density boards where 1.5-MHz operation justifies SOIC-8 rework |
Compared with LM2595SX-ADJ, LM2596SX-ADJ offers higher current and tighter regulation in identical packaging, while MP1584EN-LF-Z trades pin compatibility for higher frequency and smaller passives - making LM2595SX-ADJ optimal for cost-sensitive, thermally tolerant 1-A applications with legacy TO-263 layouts.
Availability
LM2595SX-ADJ is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and test equipment requiring stable component supply, long-lifecycle availability, and proven thermal reliability in TO-263 packages.
Supply support for LM2595SX-ADJ 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 over 50 years of innovation in high-reliability power conversion.
The LM2595 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for ease-of-use, minimal external component count, and robust operation in industrial and commercial DC-DC power supply applications.
FAQ
What is the maximum input voltage supported by the LM2595SX-ADJ?
The LM2595SX-ADJ supports a maximum input voltage of 40 V under recommended operating conditions. Absolute maximum rating is 45 V, but continuous operation above 40 V risks reliability degradation. This makes LM2595SX-ADJ suitable for 24-V industrial buses, 36-V automotive auxiliary rails, and universal AC/DC adapter outputs.
How do I set the output voltage for the LM2595SX-ADJ?
The LM2595SX-ADJ output voltage is set using a two-resistor feedback divider connected between output, feedback (pin 4), and ground. With a 1.23-V internal reference, VOUT = 1.23 × (1 + R1/R2). Standard design equations and TI's WebBench tool provide validated values; for example, 5 V requires R1 = 3.1 kΩ and R2 = 1.0 kΩ (1% tolerance).
Does the LM2595SX-ADJ require a heatsink in typical applications?
In most applications, the LM2595SX-ADJ does not require a heatsink. At 1 A load, 12 V input, and 5 V output, thermal calculations using RθJA ≈ 30°C/W (with 2.5 in² copper) show junction rise <40°C - well below the 125°C max. Heatsinking becomes necessary only above 50°C ambient or with sustained >800 mA loads at high VIN/VOUT ratios.
What protection features are built into the LM2595SX-ADJ?
The LM2595SX-ADJ includes thermal shutdown, two-stage current limiting (peak and foldback), and undervoltage lockout. These functions operate autonomously without external components. Thermal shutdown disables the switch above ~165°C junction temperature; current limiting activates at ~1.5 A peak switch current; UVLO prevents startup below ~3.5 V input.
Can the LM2595SX-ADJ be used in an inverting (positive-to-negative) configuration?
Yes, the LM2595SX-ADJ supports inverting configurations by bootstrapping the ground pin to the negative output and referencing feedback to ground. TI provides validated schematics (e.g., Figure 18 in SNVS122C) showing −5 V generation from +12 V. Key considerations include using a Schottky catch diode, selecting a 68-μH inductor, and adding startup delay to manage inrush current.
LM2595SX-ADJ 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 37V
- 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-ADJ FAQ
1.How can I place an order for LM2595SX-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2595SX-ADJ 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-ADJ reliable?
The price and inventory of LM2595SX-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2595SX-ADJ is usually 5 days.
3.What payment methods are accepted for LM2595SX-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2595SX-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2595SX-ADJ?
LM2595SX-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2595SX-ADJ 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-ADJ?
For technical support, including LM2595SX-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2595SX-ADJ requirements.
6.How does Aetrix verify that LM2595SX-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2595SX-ADJ 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-ADJ meets industry standards.
7.What is the process for return or replacement of LM2595SX-ADJ?
All LM2595SX-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2595SX-ADJ, 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-ADJ part is unused and in its original packaging.
Return procedure for LM2595SX-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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