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LTC3350 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3350 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 46 page  LTC3350 1 3350fc For more information www.linear.com/LTC3350 Typical applicaTion FeaTures DescripTion High Current Supercapacitor Backup Controller and System Monitor TheLTC®3350isabackuppowercontrollerthatcancharge and monitor a series stack of one to four supercapacitors. The LTC3350’s synchronous step-down controller drives N-channelMOSFETsforconstantcurrent/constantvoltage chargingwithprogrammableinputcurrentlimit.Inaddition, the step-down converter can run in reverse as a step-up converter to deliver power from the supercapacitor stack to the backup supply rail. Internal balancers eliminate the need for external balance resistors and each capacitor has a shunt regulator for overvoltage protection. The LTC3350 monitors system voltages, currents, stack capacitance and stack ESR which can all be read over the I2C/SMBus. The dual ideal diode controller uses N-channel MOSFETs for low loss power paths from the input and supercapacitors to the backup system supply. The LTC3350 is available in a low profile 38-lead 5mm × 7mm × 0.75mm QFN surface mount package. High Current Supercapacitor Charger and Backup Supply applicaTions n High Efficiency Synchronous Step-Down CC/CV Charging of One to Four Series Supercapacitors n Step-Up Mode in Backup Provides Greater Utilization of Stored Energy in Supercapacitors n 14-Bit ADC for Monitoring System Voltages/Currents, Capacitance and ESR n Active Overvoltage Protection Shunts n Internal Active Balancers—No Balance Resistors n VIN: 4.5V to 35V, VCAP(n): Up to 5V per Capacitor, Charge/Backup Current: 10+A n Programmable Input Current Limit Prioritizes System Load Over Capacitor Charge Current n Dual Ideal Diode PowerPath™ Controller n All N-FET Charger Controller and PowerPath Controller n Compact 38-Lead 5mm × 7mm QFN Package n High Current 12V Ride-Through UPS n Servers/Mass Storage/High Availability Systems L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PowerPath are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Patents pending. Backup Operation VIN PFI OUTFB OUTFET TGATE SW BGATE ICAP VCAP CAP4 CAP3 CAP2 CAP1 CAPRTN CAPFB INFET VOUTSP VOUTSN ICHG (STEP-DOWN) IBACKUP VCAP < VOUT (STEP-UP) VCAP > VOUT (DIRECT CONNECT) VOUT LTC3350 10F VCAP 10F 10F 10F 3350 TA01a I2C VIN 2V/DIV VCAP 2V/DIV VOUT 2V/DIV 400ms/DIV BACK PAGE APPLICATION CIRCUIT 0V 3350 TA01a PBACKUP = 25W VOUT VCAP VIN |
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