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

onsemi LM2575T-ADJG

Name: LM2575T-ADJG
Brand: onsemi
SKU: LM2575T-ADJG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM2575T-ADJG

Manufacturer:: onsemi

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: TO-220-5

Datasheet:: LM2575T-ADJG.pdf

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

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Product details

Overview

LM2575T-ADJG from onsemi is a monolithic step-down (buck) switching regulator IC delivering 1.0 A output current with adjustable output voltage from 1.23 V to 37 V, ±4% tolerance over line and load, operating from 4.75 V to 40 V input, and featuring internal 52 kHz oscillator, thermal shutdown, and cycle-by-cycle current limiting - used in compact, high-efficiency DC-DC power supplies for industrial control and embedded systems.

For engineers reviewing the LM2575T-ADJG datasheet, pinout, applications, or equivalent options, key selection considerations include its TO-220 package with heatsink-connected ground pin, feedback reference voltage of 1.23 V, 80 µA standby current under TTL shutdown, and compatibility with standard off-the-shelf inductors for minimal external component count.

Technical Context

The LM2575T-ADJG implements a fixed-frequency voltage-mode buck converter architecture with an internal 1.0 A NPN switch, 1.23 V bandgap reference, error amplifier, and 52 kHz oscillator. Regulation is achieved by comparing feedback voltage against the 1.23 V reference and adjusting duty cycle via PWM control of the internal switch.

It integrates cycle-by-cycle current limiting (1.7–3.0 A peak), thermal shutdown, and TTL-compatible ON/OFF control with 1.4 V logic threshold. The device operates across −40°C to +125°C junction temperature and supports stable operation with only four external components: input capacitor, output capacitor, catch diode, and inductor.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	1.0 A continuous - sufficient to power microcontrollers, sensors, and analog circuitry without external boost stages.
Input Voltage Range	4.75 V to 40 V - supports wide-range unregulated inputs including automotive battery (12 V nominal) and industrial 24 V rails.
Output Voltage Range	1.23 V to 37 V adjustable - set externally via two resistors; enables flexible system-level voltage scaling.
Feedback Reference	1.23 V ±2% (0°C to 125°C) - defines output accuracy baseline; determines R1/R2 ratio for target V_OUT.
Oscillator Frequency	52 kHz ±10% - fixed internal frequency simplifies EMI filtering and inductor selection; drops to ~18 kHz during overload for self-protection.
Standby Quiescent Current	80 µA typical at 25°C - enables low-power shutdown mode suitable for battery-backed or energy-sensitive applications.
Thermal Resistance (Junction-to-Case)	5.0 °C/W - allows direct heatsink mounting to Pin 3 (GND) for efficient thermal management in high-load conditions.

Pinout & Package

LM2575T-ADJG uses the TO-220 package (Case 314D), with Pin 3 (GND) electrically and thermally connected to the metal heatsink tab. Mounting the tab to a heatsink is required for full 1.0 A operation at elevated ambient temperatures.

Pin/Terminal	Circuit Role	Design Meaning
1. Vin	Positive input supply	Accepts 4.75–40 V unregulated DC; requires low-ESR bypass capacitor (e.g., 100 µF) placed adjacent to minimize switching transients.
2. Output	Emitter of internal NPN switch	Switching node driving inductor; saturation voltage ≤1.2 V at 1.0 A - contributes directly to conduction loss and efficiency.
3. GND	Circuit and thermal ground	Reference for all internal circuitry; metal tab is electrically tied to this pin - must be soldered to heatsink or large copper area for thermal integrity.
4. Feedback	Error amplifier non-inverting input	Direct connection point for external resistor divider; senses output voltage and compares to 1.23 V reference to regulate V_OUT.
5. ON/OFF	TTL-compatible enable/disable control	Logic-high (>1.4 V) disables regulator and reduces input current to ~80 µA; logic-low (<1.0 V) enables normal operation.

Key Features

Feature	Design Value
Integrated 1.0 A NPN switch	Eliminates need for external MOSFET or transistor, reducing BOM count and layout complexity in space-constrained designs.
Fixed 52 kHz switching frequency	Enables predictable EMI profile and simplifies filter design using standard inductors optimized for this frequency.
±4% output voltage tolerance	Guaranteed over full line, load, and temperature range - ensures reliable downstream circuit operation without post-regulation.
Cycle-by-cycle current limiting	Protects against short-circuit and overload faults without latch-up; peak current threshold varies from 1.4 A to 3.2 A across temperature.
TTL shutdown with 80 µA standby	Supports low-power sleep modes in portable or always-on systems while retaining fast wake-up capability.

Applications

Industrial Power Supply	Embedded System DC-DC Converter
Use Scenario: Providing regulated 5 V or 12 V from a 24 V factory bus to power PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator converting unregulated industrial rail to stable logic supply; no timing-critical function beyond fixed 52 kHz switching. Use Value: High efficiency (>77% at 12 V_IN/5 V_OUT) reduces heat generation in enclosed cabinets; TO-220 package allows direct heatsink attachment for continuous 1.0 A operation.	Use Scenario: Generating 3.3 V for an ARM Cortex-M microcontroller and peripheral ICs from a 9 V battery or wall adapter. IC Role / Device Role / Timing Role: Main DC-DC converter supplying core system voltage; internal oscillator sets switching rhythm - no external clock required. Use Value: Adjustable output enables precise 3.3 V setting; 80 µA shutdown current extends battery life in sleep states; only four external parts simplify PCB layout.
Automotive Pre-Regulator	Battery Charger Power Stage
Use Scenario: Stepping down 13.5–16 V vehicle battery voltage to 5 V for infotainment USB ports or CAN transceivers. IC Role / Device Role / Timing Role: Buck pre-regulator feeding linear LDOs; handles wide input variation and load transients inherent in automotive environments. Use Value: Wide 4.75–40 V input range accommodates cold-crank (6 V) and load-dump (40 V) events; thermal shutdown prevents damage during sustained overloads.	Use Scenario: Delivering constant-current/constant-voltage output for NiMH or Li-ion battery charging circuits in portable tools or medical devices. IC Role / Device Role / Timing Role: Adjustable-output switching stage controlling charge voltage; feedback loop dynamically adjusts V_OUT per battery chemistry requirements. Use Value: 1.23–37 V output range supports multiple chemistries (e.g., 4.2 V for Li-ion, 1.45 V/cell for NiMH); current limiting protects battery during CC phase.

Industrial Power Supply

Embedded System DC-DC Converter

Use Scenario: Providing regulated 5 V or 12 V from a 24 V factory bus to power PLC I/O modules and sensor interfaces.

IC Role / Device Role / Timing Role: Primary step-down regulator converting unregulated industrial rail to stable logic supply; no timing-critical function beyond fixed 52 kHz switching.

Use Value: High efficiency (>77% at 12 V_IN/5 V_OUT) reduces heat generation in enclosed cabinets; TO-220 package allows direct heatsink attachment for continuous 1.0 A operation.

Use Scenario: Generating 3.3 V for an ARM Cortex-M microcontroller and peripheral ICs from a 9 V battery or wall adapter.

IC Role / Device Role / Timing Role: Main DC-DC converter supplying core system voltage; internal oscillator sets switching rhythm - no external clock required.

Use Value: Adjustable output enables precise 3.3 V setting; 80 µA shutdown current extends battery life in sleep states; only four external parts simplify PCB layout.

Automotive Pre-Regulator

Battery Charger Power Stage

Use Scenario: Stepping down 13.5–16 V vehicle battery voltage to 5 V for infotainment USB ports or CAN transceivers.

IC Role / Device Role / Timing Role: Buck pre-regulator feeding linear LDOs; handles wide input variation and load transients inherent in automotive environments.

Use Value: Wide 4.75–40 V input range accommodates cold-crank (6 V) and load-dump (40 V) events; thermal shutdown prevents damage during sustained overloads.

Use Scenario: Delivering constant-current/constant-voltage output for NiMH or Li-ion battery charging circuits in portable tools or medical devices.

IC Role / Device Role / Timing Role: Adjustable-output switching stage controlling charge voltage; feedback loop dynamically adjusts V_OUT per battery chemistry requirements.

Use Value: 1.23–37 V output range supports multiple chemistries (e.g., 4.2 V for Li-ion, 1.45 V/cell for NiMH); current limiting protects battery during CC phase.

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 3.0 A output current, 150 kHz switching frequency, lower dropout, but requires larger inductor and has different pinout.	Better suited for higher-power loads (>1.5 A); less optimal for noise-sensitive analog circuits due to higher switching frequency.	Select LM2596T-ADJ when >1.0 A output or tighter ripple specs are needed; verify PCB layout and inductor compatibility before substitution.
MP1584EN-LF-Z	2.5 A output, 1.5 MHz switching, smaller solution size, but lacks integrated thermal protection and has stricter minimum on-time limitation.	Ideal for compact consumer electronics; not recommended for high-temperature or fault-prone industrial environments without external safeguards.	Choose MP1584EN-LF-Z for space-constrained designs where footprint matters more than robustness; add external thermal monitoring if required.

Compared with LM2575T-ADJG, LM2596T-ADJ delivers higher current at higher frequency with greater efficiency but demands revised magnetics and layout, while MP1584EN-LF-Z offers miniaturization at the cost of reduced fault tolerance and thermal resilience - making LM2575T-ADJG the preferred choice for rugged, thermally demanding, or legacy-compatible buck designs.

Availability

LM2575T-ADJG is available at Aetrix Electronics and suitable for industrial power supplies, embedded system DC-DC conversion, and automotive pre-regulator applications requiring stable component supply, long-term lifecycle support, and proven thermal reliability.

Supply support for LM2575T-ADJG 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient power management, analog, and sensing technologies for automotive, industrial, and cloud infrastructure markets.

The LM2575 series was designed as a cost-effective, easy-to-implement buck regulator family targeting applications where simplicity, thermal robustness, and wide-input operation outweigh ultra-high efficiency or ultra-small footprint requirements.

FAQ

What is the maximum input voltage rating for LM2575T-ADJG?

The absolute maximum input voltage for LM2575T-ADJG is 45 V, but the recommended maximum operating input voltage is 40 V per the datasheet's Operating Ratings. Exceeding 40 V risks violating guaranteed performance limits and may trigger internal protection mechanisms or reduce long-term reliability. Always maintain margin below 45 V in final designs.

How do I calculate the output voltage for LM2575T-ADJG?

The output voltage of LM2575T-ADJG is set by two external resistors: V_OUT = 1.23 V × (1 + R2/R1), where R1 connects from Feedback (Pin 4) to GND and R2 connects from Output (Pin 2) to Feedback (Pin 4). R1 should be between 1.0 kΩ and 5.0 kΩ; use 1% metal film resistors for best stability. For example, R1 = 1.2 kΩ and R2 = 3.9 kΩ yields ~5.2 V.

Does LM2575T-ADJG require a heatsink for 1.0 A operation?

Yes - LM2575T-ADJG requires a heatsink attached to the metal tab (Pin 3, GND) to sustain 1.0 A output at ambient temperatures above 50°C. With no heatsink, thermal shutdown activates under full load. The device's R_JC = 5.0 °C/W and R_JA = 65 °C/W (TO-220) mean even modest power dissipation (e.g., 1.2 W at V_IN = 12 V, V_OUT = 5 V) necessitates heatsinking for continuous operation.

What is the purpose of the ON/OFF pin (Pin 5) on LM2575T-ADJG?

Pin 5 (ON/OFF) provides TTL-compatible enable/disable control for LM2575T-ADJG. Applying ≥1.4 V disables the internal switch and reduces total input current to ~80 µA (standby mode); applying ≤1.0 V enables normal regulation. This pin supports power sequencing, low-power sleep states, and system-level fault recovery - critical in battery-powered or energy-aware designs using LM2575T-ADJG.

Can LM2575T-ADJG be used in negative-output (buck-boost) configurations?

Yes - LM2575T-ADJG can be configured as a positive-to-negative inverting buck-boost converter per Figure 1 in the datasheet, generating regulated negative voltages (e.g., −5 V, −12 V) from a positive input. In this topology, the "Output" pin becomes the negative rail, GND becomes the return path, and the feedback network references the inverted output. Component stress and efficiency differ from standard buck mode, so validate thermal and ripple performance.

LM2575T-ADJG Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-5

Packaging:: Tube

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 4.75V

Voltage - Input (Max):: 40V

Voltage - Output (Min/Fixed):: 1.23V

Voltage - Output (Max):: 37V

Current - Output:: 1A

Frequency - Switching:: 52kHz

Synchronous Rectifier:: No

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220-5

LM2575T-ADJG FAQ

1.How can I place an order for LM2575T-ADJG through Aetrix?

Please submit a Request for Quotation (RFQ) for LM2575T-ADJG 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 LM2575T-ADJG reliable?

The price and inventory of LM2575T-ADJG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575T-ADJG is usually 5 days.

3.What payment methods are accepted for LM2575T-ADJG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575T-ADJG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM2575T-ADJG?

LM2575T-ADJG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM2575T-ADJG 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 LM2575T-ADJG?

For technical support, including LM2575T-ADJG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575T-ADJG requirements.

6.How does Aetrix verify that LM2575T-ADJG is sourced from the original manufacturer or authorized distributors?

All LM2575T-ADJG 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 LM2575T-ADJG meets industry standards.

7.What is the process for return or replacement of LM2575T-ADJG?

All LM2575T-ADJG units undergo pre-shipment inspection (PSI). If there is an issue with LM2575T-ADJG, 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 LM2575T-ADJG part is unused and in its original packaging.

Return procedure for LM2575T-ADJG:

1.Submit a request within 90 days.

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

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