Features
PowerWise ? step-down controller
6V to 42V Wide input voltage range
Fixed output voltage of 3.3V
Fixed switching frequencies of 250 kHz/500 kHz/750 kHz
No loop compensation required
Fully WEBENCH ? enabled
Low external component count
Constant On-Time control
Ultra-Fast transient response
Stable with low ESR capacitors
Output voltage pre-bias startup
Valley current limit
Programmable soft-startThe LM3151/2/3 SIMPLE SWITCHER? Controller is an easy to use and simplified step down power controller capable of providing up to 12A of output current ina typical application. Operating with an input voltage range from 6V-42V, the LM3151/2/3 features a fixed output voltage of3.3V, and features switching frequencies of 250 kHz, 500 kHz, and 750 kHz. The synchronous architecture provides for highlyefficient designs. The LM3151/2/3 controller employs a Constant On-Time (COT) architecture with a proprietary Emulated RippleMode (ERM) control that allows for the use of low ESR output capacitors, which reduces overall solution size and output voltageripple. The Constant On-Time (COT) regulation architecture allows for fast transient response and requires no loop compensation,which reduces external component count and reduces design complexity.
Fault protection features such as thermal shutdown, under-voltage lockout, over-voltage protection, short-circuit protection,current limit, and output voltage pre-bias startup allow for a reliable and robust solution.
The LM3151/2/3 SIMPLE SWITCHER? concept provides for an easy to use complete design using a minimum number of external components and National’s WEBENCH? online design tool. WEBENCH? provides design support for every step of the design process and includes features such as external component calculationwith a new MOSFET selector, electrical simulation, thermal simulation, and Build-It boards for prototyping.
Feature
PowerWise ? step-down controller
6V to 42V Wide input voltage range
Fixed output voltage of 3.3V
Fixed switching frequencies of 250 kHz/500 kHz/750 kHz
No loop compensation required
Fully WEBENCH ? enabled
Low external component count
Constant On-Time control
Ultra-Fast transient response
Stable with low ESR capacitors
Output voltage pre-bias startup
Valley current limit
Programmable soft-startThe LM3151/2/3 SIMPLE SWITCHER? Controller is an easy to use and simplified step down power controller capable of providing up to 12A of output current ina typical application. Operating with an input voltage range from 6V-42V, the LM3151/2/3 a fixed output voltage of3.3V, and switching frequencies of 250 kHz, 500 kHz, and 750 kHz. The synchronous architecture provides for highlyefficient designs. The LM3151/2/3 controller employs a Constant On-Time (COT) architecture with a proprietary Emulated RippleMode (ERM) control that allows for the use of low ESR output capacitors, which reduces overall solution size and output voltageripple. The Constant On-Time (COT) regulation architecture allows for fast transient response and requires no loop compensation,which reduces external component count and reduces design complexity.
Fault protection such as thermal shutdown, under-voltage lockout, over-voltage protection, short-circuit protection,current limit, and output voltage pre-bias startup allow for a reliable and robust solution.
The LM3151/2/3 SIMPLE SWITCHER? concept provides for an easy to use complete design using a minimum number of external components and National’s WEBENCH? online design tool. WEBENCH? provides design support for every step of the design process and includes such as external component calculationwith a new MOSFET selector, electrical simulation, thermal simulation, and Build-It boards for prototyping.
