Linear Technology Analog Devices LT8708 Manuals

LT8708 1 Rev 0 For more information www.analog.com VBAT2 = 13.5V IOUT = 15A VBAT1 (V) 10 12 14 16 94 95 96 97 98 99 100 EFFICIENCY (%) EFFICIENCY 8708 TA01b + – + – CSPOUT CSNOUT EXTVCC VOUTLOMON FBOUT INTVCC GATEVCC IMON_ON IMON_OP ICN ICP IMON_INP IMON_INN CLKOUT SYNC SS RT VC MODE CSNIN TG1 BOOST1 SW1 BG1 CSP CSN LT8708 GND BG2 SW2 BOOST2 TG2 CSPIN VINCHIP SHDN FBIN VINHIMON SWEN LDO33 DIR RVSOFF 126kHz FWD (3V) RVS (0V) + + DB1 DB2 TO BOOST1 TO BOOST2 ILIM TO DIODE DB1 LD033 VBAT2 8708 TA01a ILIM 10V TO 16V BATTERY VBAT1 10V TO 16V BATTERY TO DIODE DB2 POWER TRANSFER DECISION LOGIC TYPICAL APPLICATION FEATURES DESCRIPTION 80V Synchronous 4-Switch Buck-Boost DC/DC Controller with Flexible Bidirectional Capability The LT®8708 is a high performance buck-boost switching regulator controller that operates from an input voltage that can be above, below or equal to the output voltage. Features are included to simplify bidirectional power conversion in battery/capacitor backup systems and other applications that may need regulation of VOUT, VIN, IOUT, and/or IIN. Forward and reverse current can be monitored and limited for the input and output sides of the converter. All four current limits (forward input, reverse input, forward output and reverse output) can be set independently using four resistors on the PCB. The MODE pin can select between discontinuous conduc- tion mode (DCM), continuous conduction mode (CCM), hybrid conduction mode (HCM) and Burst Mode® operation. In combination with the DIR (direction) pin, the chip can be configured to process power only from VIN to VOUT or only from VOUT to VIN. With a wide 2.8V to 80V input and 1.3V to 80V output range, the LT8708 is compatible with most solar, automotive, telecom and battery-powered systems. 12V Bidirectional Dual Battery System with FHCM and RHCM APPLICATIONS n Single Inductor Allows VIN Above, Below, or Equal to VOUT n Six Independent Forms of Regulation n VIN Current (Forward and Reverse) n VOUT Current (Forward and Reverse) n VIN and VOUT Voltage n Forward and Reverse Discontinuous Conduction Mode Supported n Supports MODE and DIR Pin Changes While Switching n VINCHIP Range 2.8V (Need EXTVCC > 6.4V) to 80V n VOUT Range: 1.3V to 80V n Synchronous Rectification: Up to 99% Efficiency n Available in 40-Lead (5mm × 8mm) QFN with High Voltage Pin Spacing n High Voltage Buck-Boost Converters n Bidirectional Charging System n Automotive 48V Systems All registered trademarks and trademarks are the property of their respective owners. Efficiency Document Feedback