POWER LOSS (W) LT8710 Synchronous SEPIC/ Inverting/Boost Controller with Output Current Control Fea T Descrip T n Wide Input Range: 4.5V to 80V The LT 8710 is a synchronous PWM DC/DC controller n Rail-to-Rail Output Current Monitor and Control with a rail-to-rail output current monitor and control. The n Input Voltage Regulation for High Impedance Inputs LT8710 is ideal for many types of power supply topologies n C/10 or Power Good Indication Pin and can be easily configured for boost, SEPIC, inverting, n MODE Pin for Forced CCM or Pulse-Skipping or flyback configurations. Operation The LT8710s rail-to-rail output current monitor and control n Switching Frequency Up to 750kHz allows the part to be configured in current limited applica- n Easily Configurable as a Boost, SEPIC, Inverting or tions such as battery charging. The FLAG pin can be used Flyback Converter with Single Feedback Pin as a power good indication or C/10 indication allowing for n Can Be Synchronized to External Clock accurate bulk and float battery voltages. n High Gain EN/FBIN Pin Accepts Slowly Varying Input The LT8710s switching frequency range can be set be- Signals n tween 100kHz and 750kHz using an external resistor or 20-Lead TSSOP Package synchronized to an external clock. a T The LT8710 also features innovative EN/FBIN pin cir- n High Power Local Power Supply cuitry that allows for slowly varying input signals and n Wide Input Voltage Range SEPIC/Inverting an adjustable undervoltage lockout function. The pin is n Lead Acid Battery Charger also used for input voltage regulation to avoid collapsing n Automotive Engine Control Unit (ECU) Power a high impedance input supply. Additional features such n Solar Panel Power Converter as frequency foldback and soft-start are integrated. The L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear LT8710 is available in a 20-lead TSSOP package. Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, Including 7579816. Typical a T 300kHz Inverter Generates 5V from a 4.5V to 25V Input Efficiency and Power Loss 10F 2 100 8 2.2H 2.2H V OUT V IN 5V 4.5V TO 25V 90 7 7A 330F 6 80 499 70 5 1.5m 100F 4m 4 65 0.47F 2 3 BG CSN CSP TG 50 V ISN IN 40 2 + 13.3k 120F ISP LT8710 30 V = 5V 1 IN EN/FBIN 60.4k BIAS INTV CC V = 12V IN 10k 2.2F 20 0 0 1 2 3 4 5 6 7 MODE INTV 2.2F EE 10F LOAD CURRENT (A) 4 INTV FBX 8710 TA01b CC FLAG RT V C 118k 11.5k SYNC GND IMON SS 100pF 47nF 220nF 3.3nF 8710 TA01a 8710f 1 For more information www.linear.com/LT8710 EFFICIENCY (%) + ion pplica ions pplica ion uresLT8710 a Te Maxi Mu M r a T (Note 1) V Voltage ................................................ 0.3V to 80V MODE Voltage ............................................ 0.3V to 40V IN BIAS Voltage .............................................. 0.3V to 80V INTV Voltage ............................................ 0.3V to 7V CC EN/FBIN Voltage ......................................... 0.3V to 80V INTV Voltage......................................................Note 5 EE BG Voltage ............................................................Note 5 CSP Voltage ................................................. 0.3V to 2V TG Voltage ............................................................Note 5 CSN Voltage ................................................. 0.3V to 2V RT Voltage ................................................... 0.3V to 5V ISP Voltage ................................. ISN 0.4V to ISN + 2V SS Voltage ................................................... 0.3V to 3V ISN Voltage ................................................ 0.3V to 80V FBX Voltage .................................................................5V IMON Voltage ............................................ 0.3V to 2.5V FBX Current ............................................................1mA Operating Junction Temperature Range V Voltage .................................................... 0.3V to 2V LT8710E ............................................. 40C to 125C C SYNC Voltage ............................................ 0.3V to 5.5V LT8710I .............................................. 40C to 125C FLAG Voltage ............................................... 0.3V to 7V Storage Temperature Range .................. 65C to 150C FLAG Current ......................................................... 1mA Lead Temperature (Soldering, 10 sec) ...................300C p c F T TOP VIEW FBX 1 20 GND V 2 19 SYNC C SS 3 18 RT FLAG 4 17 MODE IMON 5 16 EN/FBIN 21 GND ISN 6 15 CSP ISP 7 14 CSN BIAS 8 13 V IN INTV 9 12 INTV EE CC TG 10 11 BG FE PACKAGE 20-LEAD PLASTIC TSSOP T = 125C, = 38C/W, = 10C/W JMAX JA JC EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB o r D i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT8710EFE PBF LT8710EFE TRPBF LT8710FE 20-Lead Plastic TSSOP 40C to 125C LT8710IFE PBF LT8710IFE TRPBF LT8710FE 20-Lead Plastic TSSOP 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: