LTC4098-3.6 - USB Compatible Switching Power Manager/LiFePO4 Charger with Overvoltage Protection - Linear Technology - #1

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LTC4098-3.6 409836f USB Compatible Switching Power Manager/LiFePO4 Charger with Overvoltage Protection The LTC®4098-3.6 is a high efficiency USB PowerPath controller and full-featured LiFePO4 battery charger. It seamlessly manages power distribution from multiple sources including USB, wall adapter, automotive, Firewire or other high voltage DC/DC converters, and a LiFePO4 battery. The LTC4098-3.6 charge algorithm is optimized for LiFePO4 by implementing a 1-hour float voltage termination timer and a 0°C to 60°C NTC-based charge qualification range. Furthermore, completely discharged batteries are charged at the full programmed charge current. The LTC4098-3.6’s switching regulator can automatically limit its input current for USB compatibility. For automotive and other high voltage applications, the LTC40983.6 interfaces with an external switching regulator. Both the USB input and the auxiliary input controller feature Bat-Track optimized charging to provide maximum power to the application and reduced heat in high power density applications with input supplies from 5V to as high as 38V. An overvoltage protection circuit guards the LTC4098-3.6 from high voltage damage on the VBUS pin with just two external components. The LTC4098-3.6 is available in a 20-lead 3mm × 4mm × 0.75mm QFN surface mount package. n High Peak Power Battery-Powered Equipment n Backup Applications n High Reliability Handhelds n Switching Regulator with Bat-TrackTM Adaptive Output Control Makes Optimal Use of Limited Power Available from USB Port to Charge Battery and Power Application n Charge Control Algorithm Specifically Designed for LiFePO4 (Lithium Iron Phosphate) n Overvoltage Protection Guards Against Damage n Bat-Track External Step-Down Switching Regulator Control Maximizes Efficiency from Automotive, Firewire and Other High Voltage Input Sources n 180mÙ Internal Ideal Diode Plus External Ideal Diode Controller Seamlessly Provide Low Loss PowerPathTM When Input Power Is Limited or Unavailable n Preset 3.6V Charge Voltage with 0.5% Accuracy n Instant-On Operation with Discharged Battery n 700mA Maximum Load Current from USB Port n 2A Maximum Input Current from Internal Switching Regulator n 1.5A Maximum Charge Current with Thermal Limiting n 20-Lead 3mm × 4mm × 0.75mm QFN Package High Efficiency USB Compatible LiFePO4 Battery Charger with Overvoltage Protection VBUS10ìF0.1ìF3.01k50010ìF3.3ìH6.04k5V/USBTO ìCSYSTEMLOAD409836 TA01aCLPROGPROGLTC4098-3.6GNDSWBATSENSOVGATEOVSENSD0-D2BATVOUTLiFePO4+3 Reduced Power Dissipation vs Linear Battery Charger BATTERY VOLTAGE (V)2.700POWER DISSIPATION ( W)0.51.01.52.03.02.853.003.153.30409836 TA01b3.453.602.5VIN = 5VPROG = 500ICHRG= 1.1A10x MODESWITCHINGBATTERYCHARGERLINEAR BATTERYCHARGERADDITIONAL POWERAVAILABLE FOR CHARGING Typical Application Features A pplications Description L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Bat Track and PowerPath are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.