My Inquiry
My Account
Texas Instruments LM2575HVT-ADJ/LF03
- Part No.:
- LM2575HVT-ADJ/LF03
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2575HVT-ADJ/LF03.pdf
- Description:
- IC REG BUCK ADJ 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:649
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2575HVT-ADJ/LF03 from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator in TO-220 package, featuring adjustable output (1.23V–37V), 52 kHz fixed-frequency operation, ±4% output voltage tolerance, and integrated thermal shutdown/current limiting. It replaces linear regulators in industrial power supplies requiring high efficiency and minimal external components.
For engineers reviewing the LM2575HVT-ADJ/LF03 datasheet, LM2575HVT-ADJ/LF03 pinout, LM2575HVT-ADJ/LF03 application, or LM2575HVT-ADJ/LF03 equivalent, key selection criteria include its 60V max input voltage rating, 1.23V feedback reference, 1A continuous output capability, TTL-compatible shutdown, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2575HVT-ADJ/LF03 implements a current-mode PWM buck topology with internal 52 kHz oscillator, cycle-by-cycle current limiting, and thermal shutdown. Its feedback loop references a precise 1.23V internal bandgap, enabling stable output regulation across 1.23V–37V via external resistor divider.
It operates over −40°C to +125°C junction temperature, supports up to 60V input, delivers 1A load current with typical 77% efficiency at 12VIN/5VOUT, and enters low-power standby (50 μA) when the ON/OFF pin is pulled high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1A continuous - supports full-load operation without external current boosting |
| Input Voltage Range | 4.75V to 60V - enables direct use in 48V industrial bus, automotive battery, and wide-input DC-DC pre-regulator applications |
| Feedback Reference Voltage | 1.23V ±1.2% - sets output via R1/R2 divider; determines minimum output (1.23V) and accuracy of programmable range |
| Switching Frequency | 52 kHz ±10% - fixed internal oscillator simplifies EMI filtering and allows use of low-cost, high-saturation-current inductors |
| Efficiency | 77% typ. at 12VIN/5VOUT/1A - reduces thermal load vs. linear regulators; eliminates need for large heatsinks in many cases |
| Standby Current | 50 μA typical - enables low-power system-level shutdown without auxiliary control circuitry |
| Thermal Shutdown Threshold | 150°C junction - protects device under overload or poor heatsinking; auto-recovery on cooldown |
Pinout & Package
LM2575HVT-ADJ/LF03 is housed in a 5-lead TO-220 package (package code NDH0005D) with exposed tab electrically connected to Pin 2 (Output). The tab serves as primary thermal path and must be mounted to heatsink or copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Input | Unregulated DC input supply | Accepts 4.75–60V; requires local 100 μF/75V electrolytic bypass capacitor |
| 2 - Output | Regulated switched output node | Drives inductor; connects to cathode of catch diode and output capacitor; tab is internally tied to this pin |
| 3 - Ground | Power and signal reference | Low-impedance return for IC core, feedback, and shutdown circuits; must be star-connected near input/output caps |
| 4 - Feedback | Resistor-divider sense input | Compares divided output voltage to 1.23V reference; open for ADJ version; sets VOUT = 1.23 × (1 + R2/R1) |
| 5 - ON/OFF | TTL-compatible enable/disable control | Pull ≥2.2V to disable (50 μA standby); pull ≤0.8V to enable; no pull-up required |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1A NPN switch | Eliminates need for external power transistor; rated for 60V breakdown and 2.2A peak current limit |
| Fixed 52 kHz oscillator | Enables predictable EMI profile and simplifies filter design using standardized inductor families |
| Internal frequency compensation | Reduces external component count to just 4: input cap, output cap, catch diode, and inductor |
| TTL shutdown interface | Allows direct connection to microcontroller GPIO without level-shifting or external logic |
| Thermal + current protection | Prevents damage during sustained overload, short-circuit, or inadequate heatsinking-no external sensing needed |
Applications
| Industrial Power Supply | Automotive Pre-Regulator |
|---|---|
Use Scenario: 24V vehicle battery powers 5V/1A logic subsystem in telematics unit. IC Role / Device Role / Timing Role: Primary buck converter stepping down unregulated 9–36V automotive input to stable 5V rail. Use Value: Withstands load dump transients up to 60V; maintains regulation during cold-crank (6.5V min); 77% efficiency minimizes cabin heat buildup. |
Use Scenario: 48V telecom rack supplies isolated 12V intermediate bus for downstream POL converters. IC Role / Device Role / Timing Role: High-input-voltage pre-regulator delivering 12V@1A before final point-of-load conversion. Use Value: 60V absolute max input accommodates 48V system surges; 52 kHz switching avoids AM radio band; TO-220 tab enables bolt-on heatsinking. |
| Programmable Lab Supply | On-Card Buck Converter |
Use Scenario: Bench power supply with front-panel potentiometer adjusts output from 1.23V to 30V. IC Role / Device Role / Timing Role: Adjustable-output core regulator controlled by precision R1/R2 divider network. Use Value: 1.23V reference enables accurate low-voltage setting; ±4% output tolerance holds across line/load/temp; 1A capability supports prototyping loads. |
Use Scenario: Embedded controller board requires dedicated 3.3V rail from 12V backplane. IC Role / Device Role / Timing Role: Compact, self-contained buck stage replacing inefficient linear LDO on PCB. Use Value: Requires only 4 passive components; TO-220 footprint allows manual rework; thermal shutdown prevents field failure due to airflow blockage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575T-ADJ | 40V max input (vs. 60V); same pinout, package, and 1.23V reference | Not suitable for >40V input systems (e.g., 48V industrial, load dump) | Select LM2575T-ADJ only if input stays ≤40V; otherwise LM2575HVT-ADJ/LF03 ensures margin |
| LM2596-ADJ | Higher 3A output, 150 kHz switching, different pinout (SO-8), requires different layout | Supports higher current but demands revised PCB design and faster diode/inductor | Choose LM2596-ADJ only when >1A is needed; LM2575HVT-ADJ/LF03 offers proven reliability and simpler magnetics at 1A |
Compared with LM2575T-ADJ and LM2596-ADJ, LM2575HVT-ADJ/LF03 uniquely balances 60V input resilience, TO-220 serviceability, and minimal BOM count-making it optimal for cost-sensitive, thermally constrained 1A industrial and automotive buck designs where layout reuse and supply chain stability matter.
Availability
LM2575HVT-ADJ/LF03 is available at Aetrix Electronics and suitable for industrial power supplies, automotive pre-regulators, programmable lab equipment, and on-card DC-DC conversion requiring stable component supply and long-term manufacturability.
Supply support for LM2575HVT-ADJ/LF03 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 ICs, with decades of expertise in switching regulator design and manufacturing.
The LM2575HVT-ADJ/LF03 belongs to TI's SIMPLE SWITCHER® family-engineered for ease of use in cost-sensitive, medium-power DC-DC applications where reliability, thermal robustness, and minimal external components are critical.
FAQ
What is the maximum input voltage supported by the LM2575HVT-ADJ/LF03?
The LM2575HVT-ADJ/LF03 supports a maximum input voltage of 60V, confirmed in its Absolute Maximum Ratings table. This HV variant is specifically designed for applications exceeding the 40V limit of standard LM2575 devices-such as 48V industrial buses, automotive systems with load dump transients, and telecom power rails. Operation above 40V requires the HVT suffix part; using LM2575T-ADJ in such conditions risks permanent damage.
How is the output voltage set on the LM2575HVT-ADJ/LF03?
The LM2575HVT-ADJ/LF03 uses an external resistor divider connected between output, feedback (Pin 4), and ground to set output voltage. With a precise 1.23V internal reference, VOUT = 1.23 × (1 + R2/R1). R1 is typically 1–5 kΩ (1% metal film recommended); R2 is calculated accordingly. For example, 12V output requires R2 ≈ 8.84 kΩ when R1 = 1.2 kΩ. The feedback pin draws only 50–100 nA, minimizing divider error.
Does the LM2575HVT-ADJ/LF03 require an external diode, and what type is recommended?
Yes, the LM2575HVT-ADJ/LF03 requires an external Schottky catch diode (D1) connected from output (Pin 2) to ground. Recommended parts include MBR340 (40V, 3A) or SR103 (30V, 1A), selected for low forward voltage (<0.5V) and fast recovery to minimize conduction loss and switching stress. Diode reverse voltage rating must exceed max input (≥1.25 × VINMAX), and current rating should be ≥1.2 × ILOAD for reliability under transient overload.
What thermal considerations apply to the LM2575HVT-ADJ/LF03 in TO-220 package?
The LM2575HVT-ADJ/LF03 in TO-220 (NDH0005D) has θJA = 65°C/W with minimal copper and 45°C/W with ~4 in² PCB copper area. Its exposed tab (connected to Pin 2) must be thermally coupled to a heatsink or large copper pour. At 1A load and 24V input, power dissipation can exceed 5W-requiring heatsinking to maintain TJ < 125°C. Thermal shutdown activates at 150°C junction, providing fault protection but not steady-state thermal management.
Can the LM2575HVT-ADJ/LF03 be synchronized to an external clock?
No, the LM2575HVT-ADJ/LF03 does not support external clock synchronization. Its 52 kHz oscillator is fully internal and fixed-frequency. This design choice prioritizes simplicity and EMI predictability over synchronization flexibility. If phase alignment or noise spreading is required, alternative regulators like LM2596 or newer TI buck controllers (e.g., TPS54302) with SYNC pins must be used instead of LM2575HVT-ADJ/LF03.
LM2575HVT-ADJ/LF03 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 57V
- 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
LM2575HVT-ADJ/LF03 FAQ
1.How can I place an order for LM2575HVT-ADJ/LF03 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575HVT-ADJ/LF03 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 LM2575HVT-ADJ/LF03 reliable?
The price and inventory of LM2575HVT-ADJ/LF03 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575HVT-ADJ/LF03 is usually 5 days.
3.What payment methods are accepted for LM2575HVT-ADJ/LF03?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575HVT-ADJ/LF03 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575HVT-ADJ/LF03?
LM2575HVT-ADJ/LF03 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575HVT-ADJ/LF03 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 LM2575HVT-ADJ/LF03?
For technical support, including LM2575HVT-ADJ/LF03 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575HVT-ADJ/LF03 requirements.
6.How does Aetrix verify that LM2575HVT-ADJ/LF03 is sourced from the original manufacturer or authorized distributors?
All LM2575HVT-ADJ/LF03 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 LM2575HVT-ADJ/LF03 meets industry standards.
7.What is the process for return or replacement of LM2575HVT-ADJ/LF03?
All LM2575HVT-ADJ/LF03 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575HVT-ADJ/LF03, 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 LM2575HVT-ADJ/LF03 part is unused and in its original packaging.
Return procedure for LM2575HVT-ADJ/LF03:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2575HVT-ADJ/LF03 Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
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.
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…
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…
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…
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 …
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…
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…
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…
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…
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…
