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Semiconductor PowerWise ® Buck controller
- Wide input voltage range of 6V to 42V
- The fixed output voltage is 3.3V
- Fixed switching frequency of 250 kHz/500 kHz/750 kHz
- No loop compensation is required
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COMPLETE WEBENCH ® enable
- Low external component count
- Constant on-time control
- Ultra-fast transient response
- Stabilizes low ESR capacitance
- Output voltage prebias start-up
- Valley current limit
- Programmable soft-start
illustrate
SIMPLE SWITCHER for LM3151/2/3 ® The controller, the brownout controller provides a typical application with an output current of 12A easy to use and simplify in one step. Operating with input voltage ranges from 6V to 42V, the LM3151/2/3 features a fixed output voltage of 3.3V and features switching frequencies of 250 kHz, 500 kHz and 750 kHz. Synchronous architecture provides efficient design. The LM3151/2/3 controller uses proprietary analog ripple mode (ERM) control, allowing the use of low ESR output capacitors, thereby reducing the overall solution size and constant on-time (COT) architecture of output voltage ripple. 's constant on-time (COT) regulatory architecture enables fast transient response without loop compensation, reducing external component count and design complexity.
Fault protection features such as thermal shutdown, undervoltage lockout, overvoltage protection, short-circuit protection, current limit, and output voltage prebias start-up allow for a safe, reliable, and powerful solution.
SIMPLE SWITCHER for LM3151/2/3 ® The concept provides an easy-to-use complete design using a minimum number of external components and the WEBENCH of National Semiconductor ® Online design tools. WEBENCH ® Design support is provided at every step of the design process, including features such as the selection of a new MOSFET, electrical simulation, thermal simulation, and for prototyping, calculation of external components of the board.
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