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LTC4155 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4155 Datasheet(HTML) 1 Page - Linear Technology |
1 / 52 page LTC4155 1 4155fc TYPICAL APPLICATION FEATURES DESCRIPTION Dual-Input Power Manager/ 3.5A Li-Ion Battery Charger with I2C Control and USB OTG The LTC®4155 is a 15 watt I2C controlled power manager with PowerPath™ instant-on operation, high efficiency switching battery charging and USB compatibility. The LTC4155 seamlessly manages power distribution from two 5V sources, such as a USB port and a wall adapter, to a single-cell rechargeable Lithium-Ion/Polymer battery and a system load. The LTC4155’s switching battery charger automatically limits its input current for USB compatibility, or may draw up to 3A from a high power wall adapter. The high efficiency step-down switching charger is designed to provide maximum power to the application and reduced heat in high power density applications. I2C adjustability of input current, charge current, battery float voltage, charge termination, and many other param- eters allows maximum flexibility. I2C status reporting of key system and charge parameters facilitates intelligent control decisions. USB On-The-Go support provides 5V power back to the USB port without any additional com- ponents. A dual-input, priority multiplexing, overvoltage protection circuit guards the LTC4155 from high voltage damage on the VBUS pin. The LTC4155 is available in the low profile (0.75mm) 28-lead 4mm × 5mm QFN surface mount package. I2C Controlled High Power Battery Charger/USB Power Manager APPLICATIONS n High Efficiency Charger Capable of 3.5A Charge Current n Monolithic Switching Regulator Makes Optimal Use of Limited Power and Thermal Budget n Dual-Input Overvoltage Protection Controller n Priority Multiplexing for Multiple Inputs n I2C/SMBus Control and Status Feedback n NTC Thermistor ADC for Temperature Dependent Charge Algorithms (JEITA) n Instant-On Operation with Low Battery n Battery Ideal Diode Controller for Power Management n USB On-The-Go Power Delivery to the USB Port n Full Featured Li-Ion/Polymer Battery Charger with Four Float Voltage Settings n 28-Lead 4mm × 5mm QFN Package n Tablet PCs n Ultra Mobile PCs n Video Media Players n Digital Cameras, GPS, PDAs n Smart Phones n Portable Medical Devices L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PowerPath and Bat-Track are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. VBUS VIN CLPROG1 CLPROG2 PROG VC OVGCAP IRQ I2C GND 3 3.6k 100k ID USBGT CHGSNS USBSNS 1.21k 499Ω 47nF 10μF 22μF NTC BATSNS BATGATE NTCBIAS WALLGT LTC4155 WALLSNS VOUT SW TO SYSTEM LOAD 1μH 4155 TA01a LOAD CURRENT (A) 0 0 10 30 40 50 100 70 1.0 2.0 2.5 4155 TA01b 20 80 90 60 0.5 1.5 3.0 3.5 VBAT = 3.9V Switching Regulator Efficiency |
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