Linear Technology DC1453A Manuals

1 dc1453af DEMO MANUAL DC1453A DESCRIPTION LTM4619EV: 4.5V-28V, Dual 4A Step-Down µModule Regulator Demonstration circuit 1453A features the LTM®4619EV, the high input voltage, high effi ciency, high density, dual 4A step-down power module. Derating is necessary for certain VIN, VOUT, and thermal conditions. The two outputs are interleaved with 180° phase to minimize the input ripple and reduce the input capacitors. A minimum design only requires the bulk input and output capacitors and voltage setting resistors. The LTM4619EV features output voltage tracking, power good indicator, RUN pin control, clock synchronization and soft-start programming. Protection L, LT, LTC, LTM, Linear Technology, the Linear logo, μModule and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. BOARD PHOTO PERFORMANCE SUMMARY (TA = 25°C) features include foldback current limiting and overvolt- age protection. Burst Mode® operation or pulse skipping mode can be selected for better light load effi ciency. The LTM4619 data sheet must be read in conjunction with this demo manual for working on or modifying the demo circuit 1453A. Design fi les for this circuit board are available at http://www.linear.com/demo PARAMETER CONDITION VALUE Input Voltage Range 4.5V to 28V Output Voltage VOUT1, VOUT2 3.3V ±2%, 1.8V ±2% Maximum Continuous Output Current Derating Is Necessary for Certain VIN, VOUT, and Thermal Conditions, See Datasheet for Details. 4ADC for VOUT1, VOUT2 Default Operating Frequency JP2 on the 500kHz position. 500kHz Effi ciency of Channel 1 VIN = 12V, VOUT1 = 3.3V, IOUT1 = 4A, Switching Frequency = 500kHz. 89.4%, See Figure 3 Effi ciency of Channel 2 VIN = 12V, VOUT2 = 1.8V, IOUT2 = 4A, Switching Frequency = 500kHz. 84.1% See Figure 3