Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Texas Instruments LM2595T-ADJ/LF02

Name: LM2595T-ADJ/LF02
Brand: Texas Instruments
SKU: LM2595T-ADJ/LF02
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: LM2595T-ADJ/LF02

Manufacturer:: Texas Instruments

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: TO-220-5 Formed Leads

Datasheet:: LM2595T-ADJ/LF02.pdf

Description:: IC REG BUCK ADJ 1A TO220-5

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,321

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

LM2595T-ADJ/LF02 from Texas Instruments is a monolithic nonsynchronous step-down (buck) DC-DC converter IC delivering up to 1 A output current, operating at a fixed 150-kHz switching frequency, with adjustable output voltage range of 1.2 V to 37 V (±4% tolerance), input voltage support up to 40 V, and integrated thermal shutdown and current-limit protection - used in board-level power conversion for industrial control and embedded systems.

For engineers reviewing the LM2595T-ADJ/LF02 datasheet, LM2595T-ADJ/LF02 pinout, LM2595T-ADJ/LF02 application, or LM2595T-ADJ/LF02 equivalent, key selection criteria include output adjustability via external resistor divider, TTL-compatible ON/OFF control with 85 μA standby current, TO-220-5 package thermal performance, and compatibility with standard off-the-shelf inductors.

Technical Context

The LM2595T-ADJ/LF02 implements a fixed-frequency, current-mode controlled buck topology with internal oscillator (127–173 kHz over temperature), integrated 1-A NPN switch, and voltage feedback loop referenced to 1.23 V nominal feedback threshold. It operates in continuous or discontinuous conduction mode depending on load and inductor selection.

Its functional architecture includes undervoltage lockout, delayed start-up via ON/OFF pin biasing, and two-stage current limiting - one for peak switch current (1.15–2.6 A), another reducing oscillator frequency under overload. Feedback bias current is 10–100 nA, enabling high-impedance voltage-divider programming.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	1 A DC maximum - supports mid-power point-of-load regulation without external current boosting.
Input Voltage Range	4.5 V to 40 V - enables direct operation from 12-V/24-V industrial rails and battery-backed systems.
Output Voltage Range	1.2 V to 37 V (adjustable) - set precisely using external R1/R2 divider; V_FB = 1.23 V ±2.5%.
Switching Frequency	150 kHz typical (110–173 kHz over temp) - balances efficiency, EMI, and inductor size; avoids AM radio band.
Feedback Bias Current	10–100 nA - permits use of high-value resistors (e.g., 100 kΩ/10 kΩ) minimizing divider power loss.
Standby Quiescent Current	85 μA typical (≤250 μA over temp) - enables low-power shutdown mode with logic-level ON/OFF control.
Thermal Shutdown	Active at T_J ≥ 150°C - protects device during sustained overload or poor heatsinking.

Pinout & Package

LM2595T-ADJ/LF02 is housed in a 5-pin TO-220 package (NDH variant), with exposed tab electrically connected to Pin 3 (Ground) for thermal conduction and mechanical mounting. No heat sink required below 50°C ambient at <12 V output.

Pin/Terminal	Circuit Role	Design Meaning
1 - Output	Switch node	Drives external catch diode and inductor; swings between (V_IN − V_SAT) 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 pulsed switch current and suppress transients.
3 - Ground	Reference and thermal path	Common return for internal circuitry and external components; tab connection enables heatsinking to chassis or PCB copper pour.
4 - Feedback	Voltage sense input	Monitors output via resistor divider; regulates output by comparing to 1.23 V internal reference; bias current ≤100 nA.
5 - ON/OFF	Logic enable/disable	TTL-compatible shutdown: <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 150-kHz oscillator	Enables predictable filter design with standard inductors and reduces need for frequency compensation components.
Internal current limit & thermal shutdown	Provides self-protection without external sensing; dual-stage current limit reduces frequency under overload to maintain regulation.
Low 85-μA standby current	Supports energy-sensitive applications like battery backup or remote sensors where system-level sleep modes are critical.
Adjustable output (1.2–37 V)	Eliminates need for multiple fixed-voltage SKUs; single BOM item covers wide range of downstream rail requirements.
Only 4 external components required	Reduces bill-of-materials count and layout complexity: input cap, output cap, inductor, catch diode - no compensation network needed.

Applications

Industrial PLC I/O Module Power	Automotive Body Control Unit (BCU)
Use Scenario: Providing isolated 5-V or 3.3-V rails for microcontrollers, CAN transceivers, and analog sensor interfaces within DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24-V DC field bus to stable low-voltage logic supplies; operates continuously under variable load and temperature. Use Value: High efficiency (>82% at 12-V_IN/5-V_OUT) minimizes thermal stress in enclosed enclosures; 40-V max input accommodates load-dump transients.	Use Scenario: Generating 3.3-V supply for infotainment MCU and 5-V rail for LIN transceivers in automotive body electronics modules. IC Role / Device Role / Timing Role: Non-isolated buck converter handling cold-crank (4.5 V) to load-dump (36 V) conditions while maintaining regulated outputs across –40°C to 125°C junction range. Use Value: Built-in thermal shutdown and current limit ensure robustness against short-circuit faults; TO-220 package allows direct mounting to metal housing for passive cooling.
Point-of-Load Converter for FPGA Boards	Positive-to-Negative Inverting Supply
Use Scenario: Delivering 1.2-V core voltage to Xilinx Spartan-7 FPGA on compact development boards with limited board space. IC Role / Device Role / Timing Role: Adjustable buck regulator configured with precision resistor divider to meet tight FPGA core voltage tolerance (±3%). Use Value: 1.23-V feedback reference and low 100-nA bias current enable accurate, low-drift output setting; 1-A rating supports FPGA dynamic current bursts.	Use Scenario: Generating –5-V rail from +12-V input for op-amp biasing or legacy analog signal conditioning circuits. IC Role / Device Role / Timing Role: Reconfigured as inverting regulator using external diodes and modified ground reference; maintains regulation despite polarity inversion. Use Value: Confirmed inverting topology in TI datasheet Figure 18; supports up to 1-A output with proper component selection; ON/OFF pin retains shutdown functionality with level-shifting.

Industrial PLC I/O Module Power

Automotive Body Control Unit (BCU)

Use Scenario: Providing isolated 5-V or 3.3-V rails for microcontrollers, CAN transceivers, and analog sensor interfaces within DIN-rail mounted programmable logic controllers.

IC Role / Device Role / Timing Role: Primary step-down regulator converting 24-V DC field bus to stable low-voltage logic supplies; operates continuously under variable load and temperature.

Use Value: High efficiency (>82% at 12-V_IN/5-V_OUT) minimizes thermal stress in enclosed enclosures; 40-V max input accommodates load-dump transients.

Use Scenario: Generating 3.3-V supply for infotainment MCU and 5-V rail for LIN transceivers in automotive body electronics modules.

IC Role / Device Role / Timing Role: Non-isolated buck converter handling cold-crank (4.5 V) to load-dump (36 V) conditions while maintaining regulated outputs across –40°C to 125°C junction range.

Use Value: Built-in thermal shutdown and current limit ensure robustness against short-circuit faults; TO-220 package allows direct mounting to metal housing for passive cooling.

Point-of-Load Converter for FPGA Boards

Positive-to-Negative Inverting Supply

Use Scenario: Delivering 1.2-V core voltage to Xilinx Spartan-7 FPGA on compact development boards with limited board space.

IC Role / Device Role / Timing Role: Adjustable buck regulator configured with precision resistor divider to meet tight FPGA core voltage tolerance (±3%).

Use Value: 1.23-V feedback reference and low 100-nA bias current enable accurate, low-drift output setting; 1-A rating supports FPGA dynamic current bursts.

Use Scenario: Generating –5-V rail from +12-V input for op-amp biasing or legacy analog signal conditioning circuits.

IC Role / Device Role / Timing Role: Reconfigured as inverting regulator using external diodes and modified ground reference; maintains regulation despite polarity inversion.

Use Value: Confirmed inverting topology in TI datasheet Figure 18; supports up to 1-A output with proper component selection; ON/OFF pin retains shutdown functionality with level-shifting.

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM2596T-ADJ	Higher 150-kHz frequency same, but improved 3-A output capability and lower 1.23-V feedback reference tolerance (±1.5%).	Supports higher-current loads; requires larger inductor and diode; better suited for 2–3 A applications where LM2595T-ADJ/LF02 reaches thermal limits.	Select LM2596T-ADJ when output current exceeds 1 A or tighter output accuracy is required; not pin-compatible due to different thermal pad layout.
MP1584EN-LF-Z	3-A synchronous buck with 1.5-MHz switching, smaller external components, but no integrated thermal shutdown flag and different pinout.	Enables compact designs with ceramic output capacitors; lacks built-in ON/OFF hysteresis and requires external enable logic for precise sequencing.	Choose MP1584EN-LF-Z for space-constrained, high-efficiency designs needing >1.5 A; verify PCB layout and enable timing compatibility before substitution.

Compared with LM2595T-ADJ/LF02, LM2596T-ADJ offers higher current and tighter regulation but larger footprint, while MP1584EN-LF-Z delivers higher frequency and integration at the cost of reduced fault visibility and non-drop-in replacement - making LM2595T-ADJ/LF02 optimal for cost-sensitive, thermally tolerant 1-A applications requiring proven reliability and minimal external parts.

Availability

LM2595T-ADJ/LF02 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and FPGA power management requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for LM2595T-ADJ/LF02 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 high-reliability power conversion ICs.

The LM2595 series was designed as part of TI's SIMPLE SWITCHER® portfolio to simplify DC-DC buck regulator implementation for engineers needing robust, low-component-count solutions for industrial, automotive, and communications equipment.

FAQ

What is the maximum input voltage rating for LM2595T-ADJ/LF02?

The absolute maximum input voltage for LM2595T-ADJ/LF02 is 45 V, but the recommended operating range is 4.5 V to 40 V. Operation above 40 V risks exceeding safe power dissipation limits and may trigger thermal shutdown. The 40-V upper limit ensures reliable performance under transient conditions such as automotive load dump, and is validated across the full –40°C to +125°C junction temperature range specified in the datasheet.

How do I calculate the output voltage for LM2595T-ADJ/LF02?

The output voltage of LM2595T-ADJ/LF02 is set using a resistor divider from V_OUT to GND, with the midpoint connected to the Feedback (Pin 4) pin. The formula is V_OUT = 1.23 V × (1 + R1/R2), where R1 connects to V_OUT and R2 connects to GND. For example, R1 = 10 kΩ and R2 = 1.24 kΩ yields ~1.23 × (1 + 8.06) ≈ 11.1 V. The feedback bias current (≤100 nA) introduces negligible error in standard resistor values.

Does LM2595T-ADJ/LF02 require an external catch diode?

Yes, LM2595T-ADJ/LF02 requires an external Schottky or fast-recovery diode connected from the Output (Pin 1) to GND. This diode provides the freewheeling path for inductor current when the internal switch is off. TI recommends a 3-A, 40-V Schottky diode (e.g., SB540) for most 1-A applications to minimize forward voltage drop and improve efficiency. The diode is not integrated and must be placed adjacent to the IC to reduce parasitic inductance.

Can LM2595T-ADJ/LF02 be used in an inverting configuration?

Yes, LM2595T-ADJ/LF02 supports positive-to-negative inverting operation, as documented in TI's datasheet Figure 18. In this configuration, the Ground pin is connected to the negative output rail, and the Feedback pin is referenced to GND. The ON/OFF pin requires level-shifting for proper control, and startup current demands increase significantly - TI recommends adding delayed start-up circuitry (RC network on ON/OFF pin) to manage inrush into large output capacitors.

What thermal considerations apply to LM2595T-ADJ/LF02 in TO-220 package?

LM2595T-ADJ/LF02 in TO-220 (NDH) has a junction-to-ambient thermal resistance (R_θJA) of 50°C/W on a 0.5-in² 1-oz copper PCB. At 1-A load and 12-V input/5-V output, power dissipation is ~7 W - resulting in ~350°C rise above ambient, which exceeds the 150°C max junction limit. Therefore, a minimum 1-in² copper pour or small heatsink is required. TI states no heatsink is needed only for outputs <12 V and ambient <50°C with adequate PCB copper area.

LM2595T-ADJ/LF02 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:: 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:: Through Hole

Supplier Device Package:: TO-220-5

LM2595T-ADJ/LF02 FAQ

1.How can I place an order for LM2595T-ADJ/LF02 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM2595T-ADJ/LF02 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-ADJ/LF02 reliable?

The price and inventory of LM2595T-ADJ/LF02 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2595T-ADJ/LF02 is usually 5 days.

3.What payment methods are accepted for LM2595T-ADJ/LF02?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2595T-ADJ/LF02 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM2595T-ADJ/LF02?

LM2595T-ADJ/LF02 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM2595T-ADJ/LF02 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-ADJ/LF02?

For technical support, including LM2595T-ADJ/LF02 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2595T-ADJ/LF02 requirements.

6.How does Aetrix verify that LM2595T-ADJ/LF02 is sourced from the original manufacturer or authorized distributors?

All LM2595T-ADJ/LF02 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-ADJ/LF02 meets industry standards.

7.What is the process for return or replacement of LM2595T-ADJ/LF02?

All LM2595T-ADJ/LF02 units undergo pre-shipment inspection (PSI). If there is an issue with LM2595T-ADJ/LF02, 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-ADJ/LF02 part is unused and in its original packaging.

Return procedure for LM2595T-ADJ/LF02:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…