LT8714 Bipolar Output Synchronous Controller with Seamless Four Quadrant Operation FEATURES DESCRIPTION n Bipolar Output Cleanly Transitions Through 0V The LT 8714 is a synchronous PWM DC/DC controller n Output Can Source or Sink Current for Any designed for a four quadrant output converter. The output OutputVoltage voltage cleanly transitions through zero volts with sourcing n CTRL Pin Externally Sets Output Voltage and sinking output current capability. n Wide Input Range: 4.5V to 80V The LT8714 is ideal for regulating to positive, negative, n Power Good Indication Pin (PG) or zero volts when configured for the novel four quadrant n Switching Frequency Up to 750kHz topology. Applications include four quadrant power sup- n Can Be Synchronized to an External Clock plies, high power bidirectional current sources, active n High Gain EN Pin Accepts Slowly Varying Input Signals loads, and high power, low frequency signal amplification. n 20-Lead TSSOP Exposed Pad Package In addition, the LT8714 incorporates a power good feature to let the user know if V is above or below its target OUT APPLICATIONS regulation voltage. n Four Quadrant Power Supplies n The LT8714s switching frequency range can be programmed Bidirectional Current Sources n between 100kHz and 750kHz via a resistor from the RT pin High Power, Low Frequency Signal Amplification n to GND. A SYNC pin is also provided if the user would like Test and Measurement n to synchronize the part to an external clock. Additional Electronic Window Tinting features such as current limiting and soft-start are included. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Patent The LT8714 is available in a 20-lead TSSOP package. pending. TYPICAL APPLICATION 200kHz, 5V to 5V Output from a 10V to 14V Input 6m 22F 2 ISN ISP 10H 10H TG V V IN OUT V Cleanly Transitions 5V TO 5V OUT 10V 22F 5A MAX TO 14V from 5V to 5V (V = 12V) IN 4 100F V CTRL 2.5m 4 1V/DIV TG V OUT 0V 5V/DIV BG CSN CSP TG 73.2k V ISN ISN IN 0A I + I 51.1k L1 L2 ISP ISP V IN 10A/DIV EN BIAS 10k 2.2F 2.2F 8714 TA01b 3.9ms/DIV LT8714 INTV INTV CC EE PG FB 178k 0.1V FOR 5V OUT RT CTRL V = 0.55V FOR 0V CTRL OUT 1.0V FOR 5V SYNC V OUT C 4.75k GND IMON SS 100pF 100nF 10nF 68nF 470nF 8714 TA01a 8714f 1 For more information www.linear.com/LT8714LT8714 ABSOLUTE MAXIMUM RATINGS (Note 1) V Voltage ................................................. 0.3V to 80V CTRL Voltage ............................................... 0.3V to 5V IN BIAS Voltage .............................................. 0.3V to 80V INTV Voltage ............................................ 0.3V to 7V CC EN 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 FB Voltage .................................................... 0.3V to 5V IMON Voltage ............................................ 0.3V to 2.5V V Voltage .................................................... 0.3V to 2V Operating Junction Temperature Range C SYNC Voltage ............................................ 0.3V to 5.5V LT8714E ............................................. 40C to 125C PG Voltage ................................................... 0.3V to 7V LT8714I .............................................. 40C to 125C PG Current ............................................................. 1mA Storage Temperature Range .................. 65C to 150C PIN CONFIGURATION TOP VIEW FB 1 20 GND V 2 19 SYNC C SS 3 18 RT PG 4 17 CTRL IMON 5 16 EN 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 ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT8714EFE PBF LT8714EFE TRPBF LT8714FE 20-Lead Plastic TSSOP Exposed Pad 40C to 125C LT8714IFE PBF LT8714IFE TRPBF LT8714FE 20-Lead Plastic TSSOP Exposed Pad 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: