POWER LOSS (W) LT8582 Dual 3A Boost/Inverting/SEPIC DC/DC Converter with Fault Protection FEATURES DESCRIPTION n Dual 42V, 3A Combined Power Switch The LT 8582 is a dual independent channel PWM DC/DC n Master/Slave (1.7A/1.3A) Switch Design converter with a power good pin and built-in fault protection n Wide Input Range: 2.5V to 22V Operating, 40V to help guard against input overvoltage and overtempera- ture conditions. Each channel consists of a 42V master Maximum Transient n switch and a 42V slave switch that can be tied together Power Good Pin for Event Based Sequencing n for a total current limit of 3A. Switching Frequency Up to 2.5MHz n Each Channel Easily Configurable as a Boost, SEPIC, The LT8582 is ideal for many local power supply designs. Inverting or Flyback Converter Each channel can be easily configured in boost, SEPIC, n Low V Switch: 270mV at 2.75A (Typical) CESAT inverting, or flyback configurations. Together, the two chan- n Can be Synchronized to an External Clock nels can produce a 12V and a 12V output with 14.4W of n Output Short-Circuit Protection combined output power from a 5V input. In addition, the n High Gain SHDN Pin Accepts Slowly Varying Input LT8582s slave switch allows the part to be configured in Signals high voltage, high power charge pump topologies that n are more efficient and require fewer components than 24-Pin 7mm 4mm DFN Package traditional circuits. APPLICATIONS The LT8582 also features innovative SHDN pin circuitry that allows for slowly varying input signals and an adjustable n Local Power Supply undervoltage lockout function. Additional features such as n Vacuum Fluorescent Display (VFD) Bias Supplies output short protection, frequency foldback and soft-start n TFT-LCD Bias Supplies are integrated. The LT8582 is available in a 24-pin 7mm n Automotive Engine Control Unit (ECU) Power 4mm DFN package. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 7579816. TYPICAL APPLICATION Efficiency and Power Loss (Load Between 12V and 12V Outputs) 1.5MHz, 5V to 12V 4.7H V OUT1 V IN 12V 100 3.2 5V 550mA 4.7F 10F 90 2.8 130k 6.04k SWA1 SWB1 V FBX1 IN1 215k 80 2.4 SHDN1 GATE1 100k 70 2.0 PG1 V 10F C1 LT8582 60 1.6 SYNC1 SS1 6.49k 50 1.2 CLKOUT1 RT1 53.6k 0.1F 4.7nF 47pF 40 0.8 CLKOUT2 GND SYNC2 30 0.4 53.6k 2.2nF 47pF 0.1F 100k PG2 RT2 20 0 215k 0 0.1 0.3 0.4 0.5 0.6 0.2 14.7k SHDN2 SS2 LOAD CURRENT (A) V 8582 TA01b IN2 V C2 10F GATE2 143k FBX2 SWA2 SWB2 2.2F 4.7H 4.7H V OUT2 s s 12V 550mA 8582 TA01a 4.7F 8582f 1 EFFICIENCY (%)LT8582 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) V Voltage ............................................... 0.3V to 40V IN1 TOP VIEW SWA1/SWB1 Voltage .................................. 0.4V to 42V RT1 Voltage ................................................. 0.3V to 5V SWA1 1 24 SWB1 SS1 Voltage .............................................. 0.3V to 2.5V V 2 23 CLKOUT1 IN1 PG1 3 22 SHDN1 FBX1 Voltage ................................................ 0.3V to 5V GATE1 4 21 RT1 V Voltage .................................................. 0.3V to 2V V 5 20 SS1 C1 C1 FBX1 6 19 SYNC1 25 SHDN1 Voltage .........................................................40V FBX2 7 GND 18 SYNC2 SHDN1 Current ......................................................1mA V 8 17 SS2 C2 GATE2 9 16 RT2 SYNC1 Voltage .......................................... 0.3V to 5.5V PG2 10 15 SHDN2 V 11 14 CLKOUT2 GATE1 Voltage ........................................... 0.3V to 60V IN2 SWA2 12 13 SWB2 PG1 Voltage ............................................... 0.3V to 40V PG1 Current ........................................................0.5mA DKD PACKAGE CLKOUT1 ........................................................... (Note 5) 24-LEAD (7mm 4mm) PLASTIC DFN T = 125C, = 34C/W, = 7C/W Operating Junction Temperature Range JMAX JA JC EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB LT8582E ............................................ 40C to 125C LT8582I ............................................. 40C to 125C Storage Temperature Range .................. 65C to 150C Note: Absolute maximum ratings are shown for channel 1 only. Channel 2 ratings are identical. ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT8582EDKD PBF LT8582EDKD TRPBF 8582 24-Pin (7mm 4mm) Plastic DFN 40C to 125C LT8582IDKD PBF LT8582IDKD TRPBF 8582 24-Pin (7mm 4mm) Plastic DFN 40C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: