Maker : National Semiconductor
Part No. : LM3151

  Datasheet PDF : LM3151.pdf
  Cross Reference : LM3151 Cross Reference
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Product Information

www.DataSheet.co.kr LM3151/LM3152/LM3153 SIMPLE SWITCHER® CONTROLLER, High Input Voltage Synchronous Step-Down August 26, 2009 LM3151/LM3152/LM3153 SIMPLE SWITCHER® CONTROLLER, High Input Voltage Synchronous Step-Down General Description The LM3151/2/3 SIMPLE 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 kHz, 500 kHz, and 750 kHz. 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 compensation, which reduces external component count and reduces design complexity. Fault protection features such as thermal shutdown, undervoltage 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 calculation with a new MOSFET selector, electrical simulation, thermal simulation, and Build-It boards for prototyping. SWITCHER® 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-start Typical Applications ■ ■ ■ ■ ■ Telecom Networking Equipment Routers Security Surveillance Power Modules Typical Application 30053201 SIMPLE SWITCHER® is a registered trademark of National Semiconductor Corporation © 2009 National Semiconductor Corporation 300532 www.national.com Datasheet pdf - http://www.DataSheet4U.net/ www.DataSheet.co.kr LM3151/LM3152/LM3153 Connection Diagram 30053202 eTSSOP-14 Ordering Information Order Number LM3151MH-3.3 LM3151MHE-3.3 LM3151MHX-3.3 LM3152MH-3.3 LM3152MHE-3.3 LM3152MHX-3.3 LM3153MH-3.3 LM3153MHE-3.3 LM3153MHX-3.3 Package Type NSC Package Drawing Input Voltage Range Output Voltage Switching Frequency Supplied As 94 Units per Anti-Static Tube eTSSOP-14 MXA14A 6V - 42V 3.3V 250KHz 250 Units in Tape and Reel 2500 Units in Tape and Reel 94 Units per Anti-Static Tube eTSSOP-14 MXA14A 6V - 33V 3.3V 500KHz 250 Units in Tape and Reel 2500 Units in Tape and Reel 94 Units per Anti-Static Tube eTSSOP-14 MXA14A 8V - 18V 3.3V 750KHz 250 Units in Tape and Reel 2500 Units in Tape and Reel www.national.com 2 Datasheet pdf - http://www.DataSheet4U.net/ www.DataSheet.co.kr LM3151/LM3152/LM3153 Pin Descriptions Pin 1 2 3 Name VCC VIN EN Description Supply Voltage for FET Drivers Input Supply Voltage Enable Function Nominally regulated to 5.95V. Connect a 1 µF to 2.2 µF decoupling capacitor from this pin to ground. Supply pin to the device. Nominal input range is 6V to 42V. See ordering information for Vin limitations. To enable the IC apply a logic high signal to this pin greater than 1.26V typical or leave floating. To disable the part, ground the EN pin. Internally connected to the resistor divider network which sets the fixed output voltage. This pin also senses the output voltage faults such a over-voltage and short...

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