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LTC4020 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4020 Datasheet(HTML) 1 Page - Linear Technology |
1 / 42 page LTC4020 1 4020fb For more information www.linear.com/LTC4020 VIN (V) 5 100 100 90 80 70 60 50 40 30 20 10 0 95 90 85 80 75 10 15 4020 TA01b 20 30 25 VOUT = 14V EFFICIENCY INPUT POWER P(LOSS) TYPICAL APPLICATION FEATURES DESCRIPTION 55V Buck-Boost Multi-Chemistry Battery Charger The LTC®4020 is a high voltage power manager provid- ing PowerPath™ instant-on operation and high efficiency battery charging over a wide voltage range. An onboard buck-boost DC/DC controller operates with battery and/or systemvoltagesabove,below,orequaltotheinputvoltage. The LTC4020 seamlessly manages power distribution between battery and converter outputs in response to load variations, battery charge requirements and input power supply limitations. TheLTC4020batterychargercanprovideaconstant-current/ constant-voltage charge algorithm (CC/CV), constant- currentcharging(CC),orchargingwithanoptimized4-step, 3-stagelead-acidbatterychargeprofile. Maximumconverter and battery charge currents are resistor programmable. The IC's instant-on operation ensures system load power even with a fully discharged battery. Additional safety features include preconditioning for heavily discharged batteries and an integrated timer for termination and protection. APPLICATIONS L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 7583113 and 8405362. n Wide Voltage Range: 4.5V to 55V Input, Up to 55V Output (60V Absolute Maximums) n Synchronous Buck-Boost DC/DC Controller n Li-Ion and Lead-Acid Charge Algorithms n ±0.5% Float Voltage Accuracy n ±5% Charge Current Accuracy n Instant-On for Heavily Discharged Batteries n Ideal Diode Controller Provides Low Loss PowerPath When Input Power is Limited n Input Voltage Regulation for High Impedance Input Supplies and Solar Panel Peak Power Operation n Onboard Timer for Protection and Termination n Bad Battery Detection with Auto-Reset n NTC Input for Temperature Qualified Charging n Binary Coded Open-Collector Status Pins n Low Profile (0.75mm) 38-Pin 5mm × 7mm QFN Package n Portable Industrial and Medical Equipment n Solar-Powered Systems n Military Communications Equipment n 12V to 24V Embedded Automotive Systems Buck-Boost DC/DC Converter Controller with PowerPath Battery Charger Accepts Inputs from 4.5V to 55V and Produces Output Voltages Up to 55V 5V to 30V 6-Cell Lead-Acid Supply/Charger Maximum Power Efficiency vs VIN (Application Circuit on Page 37) LTC4020 RNTC RSENSEB RSENSEA BUCK-BOOST DC/DC CONVERTER PowerPath BATTERY CHARGER 4020 TA01a VIN VOUT RCS |
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