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Texas Instruments LM2595S-12
- Part No.:
- LM2595S-12
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2595S-12.pdf
- Description:
- IC REG BUCK 12V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:4,853
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Product details
Overview
LM2595S-12 from Texas Instruments is a monolithic 150-kHz nonsynchronous step-down DC-DC converter delivering up to 1 A output current with fixed 12 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 - used in on-card switching regulators and efficient preregulators for linear regulators.
For engineers reviewing the LM2595S-12 datasheet, LM2595S-12 pinout, LM2595S-12 application, or LM2595S-12 equivalent, key selection considerations include output voltage accuracy at full load, thermal performance in TO-263 package without heatsink below 50°C ambient, standby current of 85 μA in TTL shutdown mode, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2595S-12 integrates a PWM controller, power switch, and internal frequency compensation operating at a fixed 150 kHz switching frequency - enabling use of compact external filter components. It employs a two-stage current-limit protection scheme and thermal shutdown to ensure safe operation under overload or elevated junction temperature conditions.
Its feedback loop senses output voltage via an internal 1.23 V reference and adjusts duty cycle to maintain regulation; the ON/OFF pin provides logic-level shutdown with 1.3 V threshold, allowing direct interface with microcontrollers or system supervisors without level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 12 V ±4% over full line/load/temperature range - ensures stable rail for downstream logic or analog circuitry without external resistive divider. |
| Max output current | 1 A DC continuous - supports moderate-power loads such as microcontroller cores, sensors, or interface ICs without external current boosting. |
| Input voltage range | 4.5 V to 40 V - accommodates wide-input industrial or automotive supply rails, including unregulated 24 V systems. |
| Switching frequency | 150 kHz (±15%) - enables use of low-cost, standard 100–220 μH inductors and reduces EMI compared to higher-frequency alternatives. |
| Standby quiescent current | 85 μA typical - minimizes battery drain in always-on systems during sleep or shutdown states. |
| Saturation voltage | 1.2 V max at 1 A - defines minimum dropout headroom; requires ≥13.2 V input for regulated 12 V output at full load. |
| Oscillator tolerance | ±15% - impacts ripple and filter sizing margin but does not affect regulation accuracy. |
Pinout & Package
LM2595S-12 is available in TO-263-5 (KTT) surface-mount package with 10.16 mm × 8.42 mm body size and exposed thermal pad for enhanced heat dissipation - no heatsink required below 50°C ambient at full 1-A load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Output | Internal power switch drain | Swings between (VIN − VSAT) and ~−0.5 V; PCB copper area must be minimized to reduce EMI coupling into sensitive circuits. |
| 2 - +VIN | Main input supply | Accepts 4.5–40 V; requires low-ESR bypass capacitor placed adjacent to pin to supply high di/dt switching current and suppress transients. |
| 3 - Ground | Power and signal reference | Common return path for internal switch, feedback, and shutdown circuits; must connect to low-impedance ground plane. |
| 4 - Feedback | Voltage sense input | Internally referenced to 1.23 V; unused in fixed-output version - left unconnected per datasheet guidance. |
| 5 - ON/OFF | Logic-controlled enable | TTL-compatible shutdown: <1.3 V = ON, >1.3 V = OFF; draws ≤200 μA in shutdown, enabling low-power system control. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12 V output | Eliminates need for external resistor divider and associated layout sensitivity - improves production yield and long-term stability. |
| Thermal shutdown | Activates at 150°C junction temperature - prevents permanent damage during sustained overload or poor heatsinking. |
| Two-stage current limit | Reduces switching frequency under overload instead of immediate shutdown - maintains partial regulation while limiting power dissipation. |
| Requires only 4 external components | Inductor, catch diode, input capacitor, output capacitor - reduces BOM count, board space, and design validation effort. |
| Standard inductor compatibility | Works with widely available 100–220 μH shielded power inductors - avoids custom magnetics and accelerates prototyping. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Converting 24 V vehicle battery to stable 12 V rail for microcontroller, CAN transceiver, and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 12 V supply with built-in fault protection. Use Value: Delivers 1 A at 90% efficiency (VIN = 25 V, ILOAD = 1 A), reducing thermal load in confined under-hood enclosures. | Use Scenario: Generating clean 12 V from noisy 12–16 V alternator-fed bus for infotainment subsystems. IC Role / Device Role / Timing Role: Pre-regulator stepping down variable input before LDOs - improves PSRR and reduces LDO thermal stress. Use Value: Withstands input transients up to 40 V and operates down to −40°C, meeting automotive cold-crank requirements. |
| Programmable Logic Controller (PLC) | Test & Measurement Equipment |
Use Scenario: On-card 12 V conversion for FPGA I/O banks and analog front-end circuitry in modular PLC backplanes. IC Role / Device Role / Timing Role: Local point-of-load regulator minimizing voltage drop across backplane traces. Use Value: Fixed 12 V output eliminates calibration drift from resistor tolerances; ±4% tolerance meets industrial I/O voltage compliance. | Use Scenario: Isolated 12 V supply for precision ADC reference and op-amp biasing in portable bench instruments. IC Role / Device Role / Timing Role: Low-noise, thermally stable DC-DC stage feeding low-dropout regulators. Use Value: 85 μA standby current extends battery life in handheld units; TO-263 package allows reflow-compatible assembly with thermal relief. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2595T-12 | TO-220-5 package with higher RθJA (50°C/W vs. 30°C/W for TO-263), same electrical specs. | Requires heatsink above ~0.5 A in still-air environments; less suitable for dense SMT layouts. | Select when through-hole assembly or mechanical mounting to chassis is preferred. |
| LM2575HVS-12 | Higher 63 V max input, 52 kHz switching, lower efficiency (~75% at 1 A), larger inductor requirement. | Better suited for 48 V telecom or industrial inputs where LM2595S-12's 40 V limit is insufficient. | Choose only when input exceeds 40 V; otherwise LM2595S-12 offers superior efficiency and smaller magnetics. |
Compared with LM2595T-12, the LM2595S-12 delivers better thermal performance in surface-mount designs; versus LM2575HVS-12, it provides higher efficiency and smaller external components at the cost of lower maximum input voltage - making LM2595S-12 optimal for 24 V and 36 V industrial systems requiring compact, reliable 12 V conversion.
Availability
LM2595S-12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and programmable logic controllers requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for LM2595S-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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and consumer applications.
The LM2595 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for ease-of-use in non-isolated DC-DC buck conversion, targeting engineers needing robust, low-component-count solutions without complex compensation networks.
FAQ
What is the maximum input voltage rating for the LM2595S-12?
The LM2595S-12 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 limits or triggering overvoltage stress; operation at 45 V is only permissible for short transient events per datasheet Absolute Maximum Ratings.
Does the LM2595S-12 require an external feedback resistor network?
No, the LM2595S-12 does not require an external feedback resistor network. As a fixed-output variant, its 12 V regulation is implemented internally - the Feedback pin (Pin 4) is left unconnected per TI's official application guidance for fixed-output versions of the LM2595 family.
Can the LM2595S-12 operate without a heatsink in a TO-263 package?
Yes, the LM2595S-12 in TO-263 package typically operates without a heatsink at full 1-A load when ambient temperature remains below 50°C and PCB copper area is ≥2.5 in² of 1-oz copper - achieving RθJA ≈ 30°C/W. Above this ambient or with reduced copper area, thermal derating or heatsinking becomes necessary.
What is the shutdown behavior of the LM2595S-12 when the ON/OFF pin is left floating?
When the ON/OFF pin (Pin 5) of the LM2595S-12 is left floating, the internal pull-down ensures the regulator remains enabled - the device powers up and regulates normally. TI explicitly states that leaving the pin open results in ON condition, identical to tying it directly to ground.
How does the LM2595S-12 handle overcurrent conditions?
The LM2595S-12 uses a two-stage current-limit protection: first stage clamps peak switch current at ~1.5 A (typical), second stage reduces oscillator frequency under sustained overload to limit average power dissipation - preventing thermal runaway while maintaining partial output regulation rather than hard shutdown.
LM2595S-12 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):
- 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)
LM2595S-12 FAQ
1.How can I place an order for LM2595S-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2595S-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 LM2595S-12 reliable?
The price and inventory of LM2595S-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2595S-12 is usually 5 days.
3.What payment methods are accepted for LM2595S-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2595S-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2595S-12?
LM2595S-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2595S-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 LM2595S-12?
For technical support, including LM2595S-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2595S-12 requirements.
6.How does Aetrix verify that LM2595S-12 is sourced from the original manufacturer or authorized distributors?
All LM2595S-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 LM2595S-12 meets industry standards.
7.What is the process for return or replacement of LM2595S-12?
All LM2595S-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2595S-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 LM2595S-12 part is unused and in its original packaging.
Return procedure for LM2595S-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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