3.5A Li-Ion Battery Charger with
I2C Control and USB OTG
High Efficiency Charger Capable of 3.5A Charge Current
n Monolithic Switching Regulator Makes Optimal Use of Limited Power and Thermal Budgetn Dual-Input Overvoltage Protection Controllern Priority Multiplexing for Multiple Inputsn I2C/SMBus Control and Status Feedback
n NTC Thermistor ADC for Temperature Dependent Charge Algorithms (JEITA)
n Instant-On Operation with Low Batteryn Battery Ideal Diode Controller for Power Management
n USB On-The-Go Power Delivery to the USB Portn Full Featured Li-Ion/Polymer Battery Charger with Four Float Voltage Settingsn 28-Lead 4mm × 5mm QFN Package
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.
n Ultra Mobile PCsn Video Media Players
n Digital Cameras, GPS, PDAsn 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.
I2C Controlled High Power Battery Charger/USB Power Manager
Switching Regulator Efficiency
1.01.52.02.5LOAD CURRENT (A)