LM34910 Datasheet | National Semiconductor

Description The LM34910 Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying 1.25A to the load. This buck regulator contains a 40V N-Channel Buck Switch, and is available in the thermally enhanced LLP-10 package. The hysteretic regulation scheme requires no loop pensation, results in fast load transient response, and simplifies circuit implementation. The operating frequency remains constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The current limit detection is set at 1.25A. Additional features include: VCC under-voltage lockout, thermal shutdown, gate drive under-voltage lockout, and maximum duty cycle limiter. Features n Integrated 40V, N-Channel buck switch n Integrated start-up regulator n Input Voltage Range: 8V to 36V n No loop pensation required n Ultra-Fast transient response n Operating frequency remains constant with load current and input voltage n Maximum Duty Cycle Limited During Start-Up n Adjustable output voltage n Valley Current Limit At 1.25A n Precision internal reference n Low bias current n Highly efficient operation n Thermal shutdown Typical Applications n High Efficiency Point-Of-Load (POL) Regulator n Non-Isolated Telemunication Buck Regulator n Secondary High Voltage Post Regulator Package n LLP-10 (4 mm x 4 mm) n Exposed Thermal Pad For Improved Heat Dissipation Connection Diagram Ordering Information Order Number LM34910SD LM34910SDX Package Type LLP-10 (4x4) LLP-10 (4x4) 10-Lead LLP NSC Package Drawing SDC10A SDC10A Supplied As 1000 Units on Tape and Reel 4500 Units on Tape and Reel © 2005 National Semiconductor Corporation DS201109 .national. Typical Application Circuit and Block Diagram FIGURE 1. .national. Pin Description PIN NAME 1 SW DESCRIPTION Switching Node Boost pin for boot-strap capacitor ISEN Current...