60V, 20A+ Battery Charging Controller DC/DC Converter Buck Boost Buck-Boost SEPIC VIN 3V to 60V System Flyback ITH Turns Any Switching Regulator Into a Charger IGATE VM BGATE LTC4000 Status BAT I = Up to 20A+ CHRG GND Multicell Battery Stack Complete Solution: PowerPath™ Control & Termination, No Software Features Input/Output Voltage: 3V to 60V Charge Currents up to 20A+ Input Ideal Diode for Low Loss Reverse Blocking and Load Sharing Programmable Input and Charge Current: ±1% Accuracy ±0.2% Accurate Programmable Float Voltage Programmable C/X or Timer-Based Charge Termination NTC Input for Temperature-Qualified Charging n n n n n n n 12S 2.2Ah Li-lon Charge Curves 52 2.5 VBAT 2.0 46 1.5 IBAT 43 1.0 40 0.5 37 0.0 34 0:0:00 1:30:00 0:30:00 1:00:00 1:15:00 0:15:00 0:45:00 TIME (HR:MIN:SEC) CHARGE CURRENT (A) BATTERY VOLTAGE (V) 49 The LTC®4000 is a high voltage controller and power manager which, when paired with a DC/DC converter, becomes a fullfeatured battery charger solution. The LTC4000 is capable of driving virtually any topology, including buck, boost, buckboost, SEPIC and flyback converters. Its intelligent PowerPath manager provides power to the system load when input power is available, enabling instant-on operation even with a deeply discharged battery. A full-featured controller, the LTC4000 can charge a variety of battery types including lithium, nickel and lead acid-based chemistries. Highly accurate charge current and float voltage, as well as onboard termination, ensure safe and accurate charging. –0.5 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. LTC4000 – Compatible with Virtually Any Linear Technology Switching Regulator 15V to 60V Buck 10A Charger for 3-Cell LiFePO4 12V to 21V Boost 10A Charger for 24V Lead Acid VIN VIN VOUT VOUT BUCK CONTROLLER ITH BOOST CONTROLLER CC ITH IID IGATE CSP CSN CLN IN IID IGATE IN BGATE LTC4000 OFB OFB FBG CL TMR CX GND BIAS CSP CSN CLN BGATE LTC4000 CC FBG CL BFB TMR CX GND BIAS BFB BAT BAT 18V to 72V Flyback 2A Charger for 1-Cell Li-Ion 6V to 36V Buck-Boost 5A Charger for 4-Cell LiFePO4 VOUT VIN VSYS • VIN VOUT • VCC FLYBACK CONTROLLER VCC VOUT IN BUCK BOOST CONTROLLER CLN IID IGATE CSP CSN ITH CC IID IGATE CSP CC LTC4000 BGATE ITH CSN CLN IN OFB LTC4000 BGATE OFB FBG FBG BFB CL TMR CX GND BIAS CL BAT TMR CX GND BIAS BFB BAT LTC4000 Pairings Verified in Linear Technology’s Lab IC Topology Input Voltage Range Output Voltage/Current Battery LTC3789 Buck-Boost 5 – 36V 14.4V/10A 4S LiFePO4 LTC3789 Buck-Boost 9 – 30V 16.8V/5A 4S Li-Ion LTC3851A Buck 5 – 38V ~4V/12A 4V Lead Acid LT3845A Buck 15 – 60V 10.8V/10A 3S LiFePO4 LT3845A Buck 36 – 48V 29.4V/2A 7S Li-Ion LT3845A Buck 5 – 38V ~4V/12A 4V Lead Acid LTC3787 Boost 12 – 21V ~30V/10A 24V Lead Acid LTC3862 Boost 10 – 20V ~55V/4A 48V Lead Acid LTC3862 Boost 19 – 24V 42.5V/53.5V/5A 11/13S Li-Ion LT1952-1 Forward 36 – 72V 53.5V/2A 48V Lead Acid LTC3805 Flyback 18 – 72V 4.2V/2A 1S Li-Ion NCP1230A Flyback 110 – 220Vac 14.4V/0.3A 4S LiFePO4 www.linear.com/4000 n 1-800-4-LINEAR 0911