Introduction to LM25007MM High Voltage Step-down Controller | Analysis of TI Synchronous Step-down Power Supply Chip
Product Introduction
The LM25007MM is a high-voltage step-down (Buck) controller launched by Texas Instruments. It supports integrated high-side and low-side MOSFETs and features high integration and high efficiency. It is specifically designed for applications with wide voltage input, space constraints, and high reliability requirements. This chip adopts MSOP-10 packaging and integrates multiple functional modules such as current mode control logic, gate driver, voltage reference, soft start, and current limiting, greatly simplifying the peripheral design.
Key technical parameters
Parameter value
The input voltage range is 7.5V to 75V
The output voltage is adjustable, with a minimum of 1.225V (reference voltage).
Switching frequency: 100 KHZ - 1MHz (adjustable)
The output current capacity can reach up to 2A (related to heat dissipation and design).
The working mode is controlled by constant frequency current mode
The internal MOSFET integrates high-side and low-side FETs
✅ Wide input range (7.5V to 75V), suitable for battery and industrial bus power supply
✅ Integrated power MOSFET, reduced external components, increased power density
✅ High efficiency synchronous step-down architecture to reduce system heat
✅ Current mode control, enhanced transient response and load regulation
✅ Programmable soft start to prevent start surges
✅ can set operating frequency (up to 1MHz), optimize external inductance and capacitance size
✅ Built-in protection: thermal shutdown, undervoltage lock, periodic current limit
✅ Small MSOP-10 package for compact layout
Typical application fields
⚙️ Industrial automation system: 24V bus step-down power supply to the core controller
🚘 Automotive power module: High voltage to low voltage DC output in the battery system
📡 Communication equipment: Communication base station and PoE module power supply
🔋 Battery-powered device: Portable device internal high voltage reduction solution
Youdaoplaceholder0 Embedded systems: Local power conversion for MCU and FPGA modules
🧪 Test and measurement instruments: Isolated power supply design for high-precision analog systems
Pin Function Description (MSOP-10)
Pin number name function 1 VIN input voltage terminal A resistor for setting the switching frequency at 2 RT 3 SS soft start control 4 EN enable pin, high-level start 5 AGND Simulated ground 6 COMP compensation network connection 7 FB output voltage feedback 8 ISEN current sensing input terminal 9 SW switch node, connect the inductor 10 PGND power Ground (Grounded)
Compatibility and equivalent model recommendations
Model manufacturer features packaging
The LM5007 TI asynchronous step-down controller supports higher input voltage VSSOP
LT3845A Analog Devices Wide input high voltage step-down controller, external FET TSSOP
The TPS54260 TI integrates a MOSFET step-down converter and a 42V input SOIC
MP1584EN MPS 28V input, 3A output, suitable for low-power DC applications SOP8
As a highly integrated synchronous step-down controller with a wide input voltage range and high power density, the LM25007MM is highly suitable for modern industrial, automotive, communication systems and other applications that have high requirements for reliability and space sensitivity. Its integrated MOSFET design reduces the number of peripheral devices and improves efficiency, making it an ideal choice for power engineers.
