LM3153 Datasheet | Texas Instruments

FEATURES - 234 Power Wise™ Step-down Controller - 6V to 42V Wide Input Voltage Range - Fixed Output Voltage of 3.3V - Fixed Switching Frequencies of 250 k Hz/500 k Hz/750 k Hz - No Loop pensation Required - Fully WEBENCH® Enabled - Low External ponent Count - Constant On-Time Control - Ultra-Fast Transient Response - Stable with Low ESR Capacitors - Output Voltage Pre-bias Startup - Valley Current Limit - Programmable Soft-start TYPICAL APPLICATIONS - Tele - Networking Equipment - Routers - Security Surveillance - Power Modules DESCRIPTION The 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 in a typical application. Operating with an input voltage range from 6V-42V, the LM3151/2/3 features a fixed output voltage of 3.3V, and features switching frequencies of 250 k Hz, 500 k Hz, and 750 k Hz. The synchronous architecture provides for highly efficient designs. The LM3151/2/3 controller employs a Constant On-Time (COT) architecture with a proprietary Emulated Ripple Mode (ERM) control that allows for the use of low ESR output capacitors, which reduces overall solution size and output voltage ripple. The Constant On-Time (COT) regulation architecture allows for fast transient response and requires no loop pensation, which reduces external ponent count and reduces design plexity. Fault protection features such as thermal shutdown, under-voltage lockout, over-voltage protection, shortcircuit protection, current limit, and output voltage prebias startup allow for a reliable and robust solution. The LM3151/2/3 SIMPLE SWITCHER concept provides for an easy to use plete design using a minimum number of external ponents and TI’s WEBENCH online design tool. WEBENCH provides design support for every step of the design process and includes features such as external ponent calculation with a new MOSFET selector, electrical simulation, thermal simulation, and Build-It boards for...