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Texas Instruments LM2595T-12/NOPB
- Part No.:
- LM2595T-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2595T-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:537
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Product details
Overview
LM2595T-12/NOPB 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, 4.5–40 V input range, and integrated thermal shutdown/current-limit protection. It serves as a primary buck regulator in industrial power supplies and embedded system rails.
For engineers reviewing the LM2595T-12/NOPB datasheet, LM2595T-12/NOPB pinout, LM2595T-12/NOPB application, or LM2595T-12/NOPB equivalent, key selection criteria include its fixed 12-V output, TO-220-5 package thermal performance, TTL-compatible ON/OFF control, 85-μA standby current, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2595T-12/NOPB implements a fixed-frequency (150 kHz) pulse-width modulation architecture with internal frequency compensation and a single N-channel DMOS power switch. Its feedback loop senses output voltage via an internal 1.23-V reference and adjusts duty cycle to maintain regulation across input variations from 15 V to 40 V and load currents from 100 mA to 1 A.
It operates in continuous conduction mode by default but supports discontinuous mode at light loads, exhibiting damped sinusoidal ringing during non-conduction periods due to inductor-parasitic capacitance interaction-normal behavior not indicative of instability. Shutdown is achieved by pulling the ON/OFF pin above 1.3 V, reducing quiescent current to 85 μA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over full temperature and load range-ensures stable rail for downstream logic and analog circuitry without external resistor network. |
| Max Output Current | 1 A DC-supports moderate-power microcontrollers, sensors, and interface ICs without external current boosting. |
| Input Voltage Range | 4.5 V to 40 V-enables direct operation from unregulated 24-V industrial buses or automotive battery systems with transient headroom. |
| Switching Frequency | 150 kHz (±15%)-permits use of compact, low-cost 100–220 μH inductors and reduces EMI compared to higher-frequency alternatives. |
| Standby Quiescent Current | 85 μA typical-minimizes battery drain in always-on monitoring systems during sleep mode. |
| Thermal Protection | Internal junction temperature shutdown at 150°C-prevents catastrophic failure under sustained overload or poor heatsinking. |
| Efficiency | 90% typical at VIN = 25 V, IOUT = 1 A-reduces heat generation and improves power budget in enclosed enclosures. |
Pinout & Package
LM2595T-12/NOPB uses the TO-220-5 (NDH) package: 14.986 mm × 10.16 mm body, vertical lead form, exposed tab electrically connected to Pin 3 (Ground), suitable for bolt-on heatsinking.
| 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 limit EMI coupling. |
| 2 (+VIN) | Power input | Accepts 4.5–40 V DC; must be bypassed with low-ESR capacitor placed adjacent to pin to supply high di/dt switching current. |
| 3 (Ground) | Power and signal reference | Common return for internal circuitry, switch, and thermal pad; connects to heatsink; forms ground plane reference for feedback loop stability. |
| 4 (Feedback) | Voltage sense input | Internally referenced to 1.23 V; unused in fixed-output versions-pin left open or grounded per datasheet guidance. |
| 5 (ON/OFF) | Logic-enable control | TTL-compatible shutdown: <1.3 V = ON, >1.3 V = OFF; draws ≤200 μA in shutdown; can be tied to GND 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. |
| 150-kHz fixed oscillator | Enables predictable filter design using standard inductors and capacitors; avoids audible noise and simplifies EMI filtering vs. variable-frequency controllers. |
| TTL shutdown capability | Allows microcontroller-driven power sequencing and system-level energy management without level-shifting circuitry. |
| Integrated protection | Combines current-limit foldback and thermal shutdown-avoids need for external fault-detection circuitry in cost-sensitive designs. |
| Low component count | Requires only four external parts (inductor, diode, input/output caps)-accelerates prototyping and reduces assembly defects. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Converting 24-V vehicle battery or factory bus to stable 12-V rail for solenoid drivers and CAN transceivers. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 12-V supply with transient immunity against load dump events. Use Value: Delivers 1-A continuous current at 90% efficiency while surviving 40-V input surges-reducing thermal stress on downstream components. | Use Scenario: Generating clean 12-V supply for microcontroller, EEPROM, and LIN transceiver in door module or seat controller. IC Role / Device Role / Timing Role: On-board switching regulator replacing linear regulators to minimize heat in space-constrained plastic housings. Use Value: 85-μA standby current extends battery life during vehicle sleep mode; TO-220 package allows direct mounting to metal chassis for passive cooling. |
| Test Equipment Power Rail | Legacy Industrial Controller |
Use Scenario: Providing stable 12-V bias for op-amps, ADC references, and relay drivers in portable calibrators and data loggers. IC Role / Device Role / Timing Role: Precision step-down regulator maintaining ±4% output accuracy across wide ambient temperature (–40°C to +125°C). Use Value: Internal 1.23-V reference and tight line/load regulation ensure measurement integrity without recalibration across operating conditions. | Use Scenario: Replacing aging 7812 linear regulators in PLC I/O modules where efficiency and thermal management are critical. IC Role / Device Role / Timing Role: Drop-in buck replacement delivering same 12-V output with 75% less heat generation at 500-mA load. Use Value: TO-220 footprint compatibility enables board-level upgrade without layout revision; built-in current limiting protects against shorted field wiring. |
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/NOPB | TO-263-5 surface-mount package; identical electrical specs; RθJA = 50°C/W (vs. 50°C/W for TO-220 on 1-in² copper). | Suitable for automated SMT assembly; requires thermal pad reflow profile; no mechanical heatsink option. | Select when board space is constrained and reflow capability exists; avoid if manual repair or bolt-on heatsinking is required. |
| LM2575T-12 | Same pinout and function but older generation; 52-kHz switching frequency; lower efficiency (≈85%); higher quiescent current (≈5 mA). | Better EMI filtering ease due to lower frequency; higher heat dissipation limits max load in sealed enclosures. | Select only for legacy redesigns requiring exact footprint match; prefer LM2595T-12/NOPB for new designs needing efficiency and thermal margin. |
Compared with LM2595SX-12/NOPB, the LM2595T-12/NOPB offers identical regulation performance with superior mechanical heatsinking flexibility; compared with LM2575T-12, it delivers 5% higher efficiency and 60× lower standby current-critical for thermally sensitive or battery-backed systems.
Availability
LM2595T-12/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2595T-12/NOPB 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 reliable, high-volume power conversion ICs.
The LM2595 series was designed as a SIMPLE SWITCHER® solution for cost-sensitive, medium-power DC-DC conversion-targeting industrial, automotive, and consumer applications where ease of use, thermal robustness, and minimal external components are essential.
FAQ
What is the maximum input voltage rating for the LM2595T-12/NOPB?
The LM2595T-12/NOPB has an absolute maximum input voltage rating of 45 V, with recommended operating range from 4.5 V to 40 V. Operation at 40 V is supported across the full temperature range and ensures reliable regulation at the upper end of industrial and automotive supply rails. Exceeding 45 V risks permanent damage per the Absolute Maximum Ratings table in the datasheet.
Does the LM2595T-12/NOPB require external feedback resistors?
No, the LM2595T-12/NOPB does not require external feedback resistors because it is a fixed-output version with internal resistor divider set to 12 V. Pin 4 (Feedback) is unused and may be left open or grounded per TI's application guidance-eliminating tuning errors and improving production yield versus adjustable variants.
Can the LM2595T-12/NOPB be used in an inverting (positive-to-negative) configuration?
Yes, the LM2595T-12/NOPB can be configured as a positive-to-negative converter by bootstrapping its ground pin to the negative output, as documented in Figure 18 of the datasheet. In this topology, it generates –12 V from a +12-V input, with startup hysteresis (ON at ~13 V, OFF at ~8 V) and requires additional Schottky diodes for stability and polarity protection.
What thermal considerations apply to the LM2595T-12/NOPB in TO-220 package?
The LM2595T-12/NOPB in TO-220 package has a junction-to-ambient thermal resistance (RθJA) of 50°C/W on a 1-in² PCB copper area. At 1-A load and 25-V input, power dissipation is ~13 W; without a heatsink, junction temperature rise would exceed safe limits. TI recommends using the exposed tab as a thermal path to a heatsink-especially above 500 mA or ambient >50°C.
Is the LM2595T-12/NOPB RoHS compliant and lead-free?
Yes, the LM2595T-12/NOPB is RoHS compliant and lead-free, as indicated by the "/NOPB" suffix per Texas Instruments' packaging nomenclature. It meets JEDEC J-STD-020 moisture sensitivity level (MSL) 3 and is qualified for lead-free reflow soldering profiles, including peak temperatures up to 260°C for 10 seconds.
LM2595T-12/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-5 Formed Leads
- Packaging:
- Tube
- Product Status:
- Active
- 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/NOPB FAQ
1.How can I place an order for LM2595T-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2595T-12/NOPB 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/NOPB reliable?
The price and inventory of LM2595T-12/NOPB 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/NOPB is usually 5 days.
3.What payment methods are accepted for LM2595T-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2595T-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2595T-12/NOPB?
LM2595T-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2595T-12/NOPB 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/NOPB?
For technical support, including LM2595T-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2595T-12/NOPB requirements.
6.How does Aetrix verify that LM2595T-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2595T-12/NOPB 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/NOPB meets industry standards.
7.What is the process for return or replacement of LM2595T-12/NOPB?
All LM2595T-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2595T-12/NOPB, 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/NOPB part is unused and in its original packaging.
Return procedure for LM2595T-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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