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Texas Instruments LM2575HVN-ADJ/NOPB
- Part No.:
- LM2575HVN-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2575HVN-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 16PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,830
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Product details
Overview
LM2575HVN-ADJ/NOPB from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator in a 16-lead PDIP package, featuring adjustable output (1.23V–37V), 52 kHz fixed-frequency operation, and integrated thermal shutdown and cycle-by-cycle current limiting. It replaces linear regulators in industrial power supplies requiring high efficiency and minimal external components.
For engineers reviewing the LM2575HVN-ADJ/NOPB datasheet, LM2575HVN-ADJ/NOPB pinout, LM2575HVN-ADJ/NOPB application, or LM2575HVN-ADJ/NOPB equivalent, this device offers verified 1A output capability, ±4% output voltage tolerance over line/load/temperature, wide 40V–60V input range, and TTL-compatible shutdown with 50 μA standby current - critical for ruggedized DC-DC conversion designs.
Technical Context
The LM2575HVN-ADJ/NOPB implements a fixed-frequency PWM buck topology with internal oscillator, error amplifier, and NPN switch. Its feedback loop references a precise 1.23V bandgap voltage at the INVERTING input of the error amp, enabling stable regulation across 1.23V–37V via external resistor divider (R1/R2).
It features cycle-by-cycle current limiting (1.7–3.2 A peak), thermal shutdown at ~150°C junction temperature, and 52 kHz switching with ±10% frequency tolerance. The HV variant supports up to 60V input, distinguishing it from standard LM2575-N (40V max) and enabling use in automotive and industrial 48V systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1A continuous - supports full-load operation without derating under typical PCB copper area and ambient conditions. |
| Input Voltage Range | 40V to 60V - enables direct use in 48V nominal industrial and telecom power rails without pre-regulation. |
| Output Voltage Range | 1.23V to 37V - set by external R1/R2 divider; 1.23V reference ensures ±4% accuracy over temperature and load. |
| Switching Frequency | 52 kHz ±10% - fixed internal oscillator simplifies EMI filtering and allows use of low-cost, high-saturation-current inductors. |
| Efficiency | 77% at VIN=12V, VOUT=5V, IOUT=1A - reduces thermal load vs. linear regulators; enables compact heatsink-free designs. |
| Standby Current | 50 μA typical - achieved via TTL-compatible ON/OFF pin; supports low-power sleep modes in battery-backed systems. |
| Thermal Resistance | θJA = 85°C/W (PDIP) - defines maximum power dissipation limit (≈1.4W) before thermal shutdown triggers at 125°C ambient. |
Pinout & Package
LM2575HVN-ADJ/NOPB uses a 16-lead plastic dual in-line package (PDIP), package code NFE0016A per TI documentation. Pin 1 is top-left corner (notch side), with pins numbered counter-clockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input Voltage Supply | Accepts 40–60V unregulated DC; requires local 100 μF/75V electrolytic bypass capacitor. |
| 2 (OUT) | Switched Output Node | Drives external catch diode and inductor; connects to LC filter output; not regulated directly. |
| 3 (GND) | Power Ground | Common return for input cap, output cap, and feedback network; must be single-point grounded near IC. |
| 4 (FEEDBACK) | Error Amplifier Inverting Input | Senses output via R1/R2 divider; 1.23V reference sets VOUT = 1.23 × (1 + R2/R1); high-impedance (50 nA bias). |
| 5 (ON/OFF) | Enable/Shutdown Control | TTL-compatible logic input: <0.8V = OFF (50 μA standby), >2.2V = ON; open-circuit defaults to ON. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Thermal Shutdown | Triggers at ~150°C junction temperature and auto-recovers on cooldown - prevents permanent damage during overload or poor heatsinking. |
| Cycle-by-Cycle Current Limit | Peak switch current limited to 1.7–3.2 A - maintains stable operation during short-circuit or heavy transient loads without latch-up. |
| Fixed 52 kHz Oscillator | Eliminates need for external timing components; enables predictable EMI spectrum and compatibility with off-the-shelf 330–470 μH inductors. |
| Low Quiescent Current | 5 mA operating / 50 μA standby - extends battery life in always-on monitoring systems and reduces no-load losses. |
| Wide Input Range Support | 60V absolute max input (HV version) - accommodates 48V systems with surge margins and eliminates need for upstream pre-regulators. |
Applications
| Industrial Power Supplies | Automotive Body Control Modules |
|---|---|
Use Scenario: Converting 48V vehicle battery rail to 5V/12V for microcontrollers and sensors in gateways or lighting control units. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, efficient, and fault-protected DC-DC conversion. Use Value: 60V input rating handles load-dump transients; thermal shutdown protects against engine-bay temperature excursions. |
Use Scenario: Generating stable 3.3V for CAN transceivers and 12V for solenoid drivers in door module ECUs. IC Role / Device Role / Timing Role: High-reliability step-down regulator with built-in current limiting and shutdown control. Use Value: 1A output sustains multiple peripheral loads; 50 μA standby current meets ISO 16750-2 quiescent drain requirements. |
| Programmable Lab Power Supplies | Telecom Remote Radio Units |
Use Scenario: Adjustable front-end stage in benchtop supplies where users select output between 1.23V and 37V via potentiometer. IC Role / Device Role / Timing Role: Core voltage-setting regulator with precision 1.23V reference and external resistor programming. Use Value: ±4% output tolerance over full line/load/temperature ensures calibration-grade stability without trimming. |
Use Scenario: Intermediate 12V rail generation from 48V backplane in outdoor RRUs exposed to wide ambient (-40°C to +85°C). IC Role / Device Role / Timing Role: Industrial-grade buck converter supporting extended temperature operation and high input surges. Use Value: −40°C to +125°C operating range and 60V input headroom ensure reliability in uncontrolled environmental enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575T-ADJ | TO-220 package (θJA = 65°C/W), 40V max input, same 1A rating and 52 kHz frequency. | Limited to ≤40V input; better thermal performance with heatsink but larger footprint than PDIP. | Select when higher input voltage margin is unnecessary and board space allows TO-220 mounting. |
| LM2596-ADJ | Higher 3A output, 150 kHz switching, wider 4–40V input, SO-8 package; different compensation and layout requirements. | Not pin-compatible; requires redesign of inductor, diode, and feedback network; superior efficiency above 1A. | Choose for higher current or smaller solution size where 60V input is not required. |
Compared with LM2575T-ADJ, LM2575HVN-ADJ/NOPB provides 20V higher input tolerance essential for 48V systems, while LM2596-ADJ trades input voltage headroom for higher current and frequency - making LM2575HVN-ADJ/NOPB optimal for ruggedized, medium-current, high-input-voltage applications where proven reliability and simple design are prioritized.
Availability
LM2575HVN-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, programmable lab equipment, and telecom remote radio units requiring stable component supply and long-term manufacturability.
Supply support for LM2575HVN-ADJ/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 high-reliability power conversion ICs.
The LM2575 series was designed as a SIMPLE SWITCHER® solution to replace linear regulators in cost-sensitive, medium-power DC-DC applications - emphasizing ease of use, minimal external parts, and robust fault protection.
FAQ
What is the maximum input voltage rating for LM2575HVN-ADJ/NOPB?
The LM2575HVN-ADJ/NOPB has an absolute maximum input voltage of 63V and a recommended operating maximum of 60V. This HV (High Voltage) variant is specifically rated for 40V–60V input range, distinguishing it from standard LM2575-N (40V max) and enabling use in 48V industrial and automotive systems where transient surges occur.
How is the output voltage set on LM2575HVN-ADJ/NOPB?
The LM2575HVN-ADJ/NOPB uses an external resistor divider connected to the FEEDBACK (pin 4) terminal to set output voltage: VOUT = 1.23V × (1 + R2/R1). R1 is typically 1k–5kΩ; R2 is selected accordingly. The 1.23V internal reference has ±4% tolerance over temperature and load, ensuring accurate regulation across the 1.23V–37V range.
Does LM2575HVN-ADJ/NOPB require a heat sink in typical operation?
LM2575HVN-ADJ/NOPB in its 16-lead PDIP package (θJA = 85°C/W) may require a small heatsink or enhanced PCB copper area when delivering 1A continuously at high input-output differentials (e.g., 60V → 5V). At lower differentials (e.g., 12V → 5V), it typically operates within thermal limits without added heatsinking due to 77% efficiency and internal thermal shutdown protection.
What is the purpose of the ON/OFF pin (pin 5) on LM2575HVN-ADJ/NOPB?
Pin 5 (ON/OFF) provides TTL-compatible enable control for LM2575HVN-ADJ/NOPB: applying <0.8V disables the regulator (50 μA standby current), while >2.2V enables normal operation. An open circuit defaults to ON. This feature supports system-level power sequencing, low-power sleep modes, and fault-initiated shutdown in safety-critical applications.
Which external components are mandatory for basic LM2575HVN-ADJ/NOPB operation?
Four mandatory external components are required for LM2575HVN-ADJ/NOPB: (1) input capacitor (100 μF, 75V aluminum electrolytic), (2) output capacitor (≥220 μF, voltage-rated ≥1.5×VOUT), (3) catch diode (Schottky, ≥3A, ≥40V PIV), and (4) power inductor (330–470 μH, rated ≥1.15×IOUT). These form the core buck converter topology and ensure stable regulation and fault protection.
LM2575HVN-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 16-PDIP
LM2575HVN-ADJ/NOPB FAQ
1.How can I place an order for LM2575HVN-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575HVN-ADJ/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 LM2575HVN-ADJ/NOPB reliable?
The price and inventory of LM2575HVN-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575HVN-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2575HVN-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575HVN-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575HVN-ADJ/NOPB?
LM2575HVN-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575HVN-ADJ/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 LM2575HVN-ADJ/NOPB?
For technical support, including LM2575HVN-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575HVN-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2575HVN-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2575HVN-ADJ/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 LM2575HVN-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2575HVN-ADJ/NOPB?
All LM2575HVN-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2575HVN-ADJ/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 LM2575HVN-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2575HVN-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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