The LTC4155IUFD is a 15 watt I2C controlled power manager with PowerPath™ instant-on operation, high efficiency switching battery charging and USB compatibility. The LTC4155IUFD 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 parameters 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 components. A dual-input, priority multiplexing, overvoltage protection circuit guards the LTC4155IUFD from high voltage damage on the VBUS pin.
The LTC4155IUFD is available in the low profile 28-lead 4mm × 5mm × 0.75mm QFN surface mount package.
Feature
- High Efficiency Charger Capable of 3.5A Charge Current
- Monolithic Switching Regulator Makes Optimal Use of Limited Power and Thermal Budget
- Dual Input Overvoltage Protection Controller
- Priority Multiplexing for Multiple Inputs
- I2C/SMBus Control and Status Feedback
- NTC Thermistor ADC for Temperature Dependent Charge Algorithms (JEITA)
- Instant-On Operation with Low Battery
- Battery Ideal Diode Controller for Power Management
- USB On-The-Go Power Delivery to the USB Port
- Full Featured Li-Ion/Polymer Battery Charger with Four Float Voltage Settings
- 28-Lead 4mm × 5mm QFN Package
Applications
- Tablet PCs
- Ultra Mobile PCs
- Video Media Players
- Digital Cameras, GPS, PDAs
- Smart Phones
- Portable Medical Devices
