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Texas Instruments LM2595T-12
- Part No.:
- LM2595T-12
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2595T-12.pdf
- Description:
- IC REG BUCK 12V 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,830
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Product details
Overview
LM2595T-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, and input voltage range up to 40 V. It integrates internal frequency compensation and thermal shutdown, and is used in on-card switching regulators requiring compact, high-efficiency buck conversion.
For engineers reviewing the LM2595T-12 datasheet, LM2595T-12 pinout, LM2595T-12 application, or LM2595T-12 equivalent, key selection considerations include its fixed 12-V output, TO-220-5 package thermal performance, 1-A load capability without external heat sink below 50°C ambient, and TTL-compatible ON/OFF control with 85-μA standby current.
Technical Context
The LM2595T-12 operates as a nonsynchronous buck regulator using an internal NPN switch with 1.2-V saturation voltage at 1 A, driven by a fixed 150-kHz oscillator (±15% tolerance). Feedback is implemented via a resistive divider connected to the FB pin, referencing a precise 1.23-V internal bandgap.
It features TTL-compatible ON/OFF control with 1.3-V threshold, thermal shutdown at 150°C junction temperature, and two-stage current limiting (1.5-A typical peak limit). The device requires only four external components - input capacitor, output capacitor, catch diode, and inductor - and supports discontinuous conduction mode for low-load efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over full line/load/temperature range - ensures stable rail for logic, analog, or interface circuitry without external feedback resistors. |
| Max Output Current | 1 A DC continuous - supports medium-power loads such as microcontrollers, sensors, or peripheral ICs without external current boosting. |
| Input Voltage Range | 4.5 V to 40 V - enables direct operation from unregulated 12-V, 24-V, or 36-V industrial supplies, including automotive battery inputs. |
| Switching Frequency | 150 kHz (±15%) - allows use of standard off-the-shelf inductors (e.g., 68–100 μH) and reduces EMI compared to higher-frequency alternatives. |
| Standby Quiescent Current | 85 μA typical - enables ultra-low-power shutdown in battery-backed or energy-sensitive systems. |
| Thermal Shutdown | 150°C junction temperature - protects against sustained overload or poor heatsinking without external thermal management circuitry. |
| ON/OFF Threshold | 1.3 V (TTL-compatible) - permits direct interfacing with microcontroller GPIO or logic-level enable signals without level-shifting. |
Pinout & Package
LM2595T-12 is supplied in a 5-pin TO-220 package (NDH variant), with exposed tab electrically connected to Pin 3 (Ground) for thermal and electrical grounding. The package measures 14.986 mm × 10.16 mm and supports through-hole mounting with optional heat sink attachment to the tab.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Output | Internal NPN switch collector | Swings between (VIN − VSAT) and ≈−0.5 V; connects directly to inductor; PCB copper area must be minimized to reduce EMI coupling. |
| 2 - +VIN | Positive input supply | Accepts 4.5–40 V; requires low-ESR input capacitor placed adjacent to pin to supply high di/dt switching current and suppress transients. |
| 3 - Ground | Circuit reference and thermal path | Common return for all internal circuits; tab is internally bonded to this pin - critical for thermal dissipation and noise control. |
| 4 - Feedback | Voltage sense input | Monitors regulated output via resistor divider; references internal 1.23-V bandgap; bias current ≤50 nA minimizes divider power loss. |
| 5 - ON/OFF | Logic-controlled enable | TTL-compatible shutdown input; <1.3 V = ON, >1.3 V = OFF; draws ≤15 μA when high; can be tied to GND for always-on operation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12-V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity while ensuring ±4% regulation across temperature and load. |
| 150-kHz fixed-frequency operation | Enables predictable EMI filtering and compatibility with low-cost, widely available 68–100 μH power inductors - no frequency tuning required. |
| Integrated thermal shutdown & current limit | Provides self-protection under overload, short-circuit, or inadequate heatsinking - no external fault-handling circuitry needed. |
| TTL-compatible ON/OFF control | Allows direct connection to MCU GPIO or system supervisor ICs without level shifters, simplifying power sequencing and low-power modes. |
| Low 85-μA standby current | Supports battery-operated or energy-harvesting applications where quiescent power must remain sub-100 μA during sleep states. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Converting 24-V vehicle battery or 24-V industrial bus to stable 12-V rail for microcontrollers, CAN transceivers, and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, regulated 12-V supply with built-in overtemperature and overcurrent protection. Use Value: Delivers 1 A continuously without external heat sink below 50°C ambient, reducing board space and assembly cost versus linear solutions. |
Use Scenario: Powering body electronics (door locks, lighting drivers, window controllers) from variable 12-V automotive battery (9–16 V). IC Role / Device Role / Timing Role: Buck converter operating in discontinuous mode at light loads to maintain regulation during idle periods. Use Value: 85-μA standby current and 1.3-V TTL enable allow seamless integration into vehicle wake-up/sleep protocols without auxiliary LDOs. |
| Embedded System Preregulator | POS Terminal Power Management |
|
Use Scenario: Pre-regulating 36-V industrial input to 12-V before feeding low-noise LDOs for analog front-ends or precision ADCs. IC Role / Device Role / Timing Role: High-efficiency preregulator minimizing power loss and thermal stress on downstream linear regulators. Use Value: 90% efficiency at 25-V input/1-A load reduces total system heat generation and improves overall power budget allocation. |
Use Scenario: Providing reliable 12-V rail for receipt printers, barcode scanners, and display backlights in retail point-of-sale terminals. IC Role / Device Role / Timing Role: Main DC-DC converter supporting mixed-signal loads with transient response optimized for pulsed printer motor currents. Use Value: Internal current limiting and thermal shutdown prevent latch-up during frequent high-current printer activation cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2595SX-12 | Same architecture and specs, but in TO-263-5 surface-mount package - smaller footprint, lower profile, and improved thermal resistance with PCB copper area. | Preferred for space-constrained or automated SMT production; requires different layout and thermal pad design vs. through-hole LM2595T-12. | Select LM2595SX-12 when board real estate or reflow assembly is prioritized; LM2595T-12 remains optimal for prototyping, manual assembly, or high-reliability through-hole mounting. |
| LM2575T-12 | Lower 52-kHz switching frequency, 1-A rating, same TO-220-5 package - results in larger inductors/capacitors and reduced efficiency (≈75% vs. 90% at 25 V). | Suitable for cost-sensitive designs where EMI filtering simplicity outweighs size/efficiency trade-offs; lacks ON/OFF pin in some variants. | Choose LM2575T-12 only if legacy design reuse or lower-frequency EMI compliance is mandatory; LM2595T-12 offers superior efficiency, smaller magnetics, and active enable control. |
Compared with LM2595SX-12, LM2595T-12 provides easier thermal management via mechanical heatsink attachment, while LM2575T-12 trades efficiency and component size for lower EMI filter complexity - making LM2595T-12 the balanced choice for new 12-V buck designs needing reliability, ease of assembly, and thermal headroom.
Availability
LM2595T-12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, embedded preregulators, and POS terminal power systems requiring stable component supply and long-term manufacturability.
Supply support for LM2595T-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 ICs.
The LM2595 series belongs to TI's SIMPLE SWITCHER® portfolio, designed specifically for engineers seeking easy-to-use, robust, and cost-effective DC-DC buck converters requiring minimal external components and no loop compensation expertise.
FAQ
What is the maximum input voltage rating for the LM2595T-12?
The LM2595T-12 has an absolute maximum input voltage rating of 45 V, with recommended operation up to 40 V. Exceeding 40 V may reduce reliability or trigger internal protection mechanisms. For sustained operation, keep VIN ≤40 V and ensure adequate input capacitance to suppress transients that could momentarily exceed this limit.
Does the LM2595T-12 require an external feedback resistor network?
No - the LM2595T-12 is a fixed-output version with internal feedback set to 12 V, so no external resistors are needed. Only four external components are required: input capacitor, output capacitor, catch diode, and inductor. This eliminates resistor tolerance errors and simplifies layout versus adjustable versions like LM2595ADJ.
Can the LM2595T-12 operate without a heat sink?
Yes - at ambient temperatures below 50°C and output loads ≤1 A, the LM2595T-12 in TO-220 package typically does not require an external heat sink. Its thermal resistance (RθJA) is ~50°C/W with 1 in² copper area; derating curves in the datasheet confirm safe operation up to 125°C junction temperature under these conditions.
What is the purpose of the ON/OFF pin on the LM2595T-12?
Pin 5 (ON/OFF) provides TTL-compatible logic control: pulling it below 1.3 V enables regulation, while pulling it above 1.3 V places LM2595T-12 in low-power standby mode drawing only 85 μA. If unused, tie it directly to ground - leaving it floating is not recommended due to potential noise-induced oscillation.
Is the LM2595T-12 RoHS compliant and lead-free?
Yes - the LM2595T-12 is manufactured by Texas Instruments in RoHS-compliant, lead-free packaging per JEDEC J-STD-020 moisture sensitivity level 3. The TO-220-5 (NDH) package uses matte tin lead finish and meets IPC/JEDEC standards for Pb-free soldering processes.
LM2595T-12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-5 Formed Leads
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-5
LM2595T-12 FAQ
1.How can I place an order for LM2595T-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2595T-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 LM2595T-12 reliable?
The price and inventory of LM2595T-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2595T-12 is usually 5 days.
3.What payment methods are accepted for LM2595T-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2595T-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2595T-12?
LM2595T-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2595T-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 LM2595T-12?
For technical support, including LM2595T-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2595T-12 requirements.
6.How does Aetrix verify that LM2595T-12 is sourced from the original manufacturer or authorized distributors?
All LM2595T-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 LM2595T-12 meets industry standards.
7.What is the process for return or replacement of LM2595T-12?
All LM2595T-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2595T-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 LM2595T-12 part is unused and in its original packaging.
Return procedure for LM2595T-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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