Linear Technology DC2268A-E Manuals

1 dc2268aef DEMO MANUAL DC2268A-E DESCRIPTION LTM4630EY-1 Dual 18A or Single 36A μModule Regulator Demonstration circuit 2268A-E is a high efficiency, high density, dual 18A, switch mode step-down power supply on a compact 1.5' × 1.2' PCB. It features the LTM4630-1 μModule regulator. The input voltage is from 4.5V to 15V. The output voltage is programmable from 0.6V to 1.8V. DC2268A-E can deliver up to 18A maximum in each chan- nel. With the help of external compensation, ±3% transient accuracy can be achieved with 25% load step. As explained in the data sheet, output current derating is necessary for certain VIN, VOUT, and thermal conditions. The board operates in continuous conduction mode in heavy load conditions. For high efficiency at low load currents, the resistor jumper (R1/R2) selects pulse-skipping mode for noise sensitive applications or Burst Mode® in less noise sensitive applications. Two outputs can be connected in parallel for a single 36A output solution with optional jumper resistors. The board allows the user to program how its L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. output ramps up and down through the TRACK/SS pin. Remote output voltage sensing is available for improved output voltage regulation at the load point. An optional input inductor L1 reduces the EMI noise for noise sensitive applications. DC2268A can be easily inserted to an edge connector for testing and debugging. These features and the availability of the LTM4630-1EY in a compact 16mm × 16mm × 5.01mm BGA package make it ideal for use in many high-density point-of-load regulation applications. The LTM4630-1 data sheet must be read in conjunction with this demo manual for working on or modifying the demo circuit DC2268A-E. Design files for this circuit board are available at http://www.linear.com/demo/DC2268A-E BOARD PHOTO Figure 1. LTM4630-1/DC2268A-E Demo Board Downloaded from Arrow.com.