Overview
The LM25576MHX/J7001799, produced by National Semiconductor (now part of Texas Instruments), is a high-performance, 42-V, 3-A step-down switching regulator. This device is designed to provide a robust power supply solution with a minimum set of external components. It features an ultra-wide input voltage range from 6 V to 42 V and can deliver an adjustable output voltage as low as 1.225 V. The LM25576 is particularly suited for applications requiring high input voltage and high current output, making it ideal for industrial and telecom power systems.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VIN to GND | - | - | 45 | V |
| BST to GND | - | - | 60 | V |
| PRE to GND | - | - | 45 | V |
| SW to GND (Steady State) | -1.5 | - | - | V |
| VCC Regulator Output | 6.85 | 7.15 | 7.45 | V |
| Operating Frequency | 50 kHz | - | 1 MHz | - |
| Output Current | - | - | 3 A | - |
| Package | - | - | HTSSOP-20EP | - |
| Body Size | - | - | 6.50 mm × 4.40 mm | - |
Key Features
- Ultra-wide input voltage range from 6 V to 42 V
- Adjustable output voltage as low as 1.225 V
- 1.5% feedback reference accuracy
- Integrated 42-V, 170-mΩ N-channel MOSFET
- Operating frequency adjustable between 50 kHz and 1 MHz with a single resistor
- Master or slave frequency synchronization
- Adjustable soft-start
- Emulated current mode control architecture
- Wide bandwidth error amplifier
- Built-in protection: cycle-by-cycle current limit, short-circuit protection, thermal shutdown, and remote shutdown
- Available in HTSSOP-20EP package with an exposed die attach pad for thermal dissipation
Applications
The LM25576 is well-suited for various applications, including:
- Industrial power systems
- Telecom power bus voltage ranges
- High input voltage and high current output requirements
Q & A
- What is the input voltage range of the LM25576?
The input voltage range of the LM25576 is from 6 V to 42 V.
- What is the maximum output current of the LM25576?
The maximum output current of the LM25576 is 3 A.
- What is the minimum output voltage that can be set for the LM25576?
The minimum output voltage that can be set for the LM25576 is 1.225 V.
- How is the operating frequency of the LM25576 adjusted?
The operating frequency of the LM25576 can be adjusted between 50 kHz and 1 MHz using a single resistor.
- Does the LM25576 support frequency synchronization?
- What kind of protection features does the LM25576 have?
The LM25576 has built-in protection features including cycle-by-cycle current limit, short-circuit protection, thermal shutdown, and remote shutdown.
- In what package is the LM25576 available?
The LM25576 is available in the HTSSOP-20EP package with an exposed die attach pad for thermal dissipation.
- What is the purpose of the soft-start feature in the LM25576?
The soft-start feature allows the regulator to gradually reach the initial steady state operating point, reducing start-up stresses and surges.
- How does the LM25576 handle fault conditions during operation?
In the event of a fault (over-temperature, Vcc UVLO, SD), the soft-start capacitor will be discharged, and a new soft-start sequence will commence when the fault condition is no longer present.
- What tools are available to support the design and optimization of the LM25576?
The LM25576 is supported by the full suite of WEBENCH® On-Line design tools.
