Dual-Input Power Manager/3.5A LiFePO4 Battery Charger with I2C Control and USB OTG
Features and Benefits
- 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
The LTC4155 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 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 LTC4155 from high voltage damage on the VBUS pin.
The LTC4155 is available in the low profile 28-lead 4mm × 5mm × 0.75mm QFN surface mount package.
- Tablet PCs
- Ultra Mobile PCs
- Video Media Players
- Digital Cameras, GPS, PDAs
- Smart Phones
- Portable Medical Devices
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Demonstration Circuit 1674A-A is dual input power manager/3.5A Li-Ion battery charger with I2C control and USB On-The-Go (OTG). The dual input multiplexer, overvoltage protection (OVP) and reverse voltage protection (RVP) is implemented with external N-channel MOSFETs. An onboard buck regulator generates the VOUT voltage from the active input voltage. This voltage is regulated to minimize the dissipation in the battery charger. The minimum voltage of the VOUT regulator is 3.5V to provide an instant-on function when the battery is fully discharged. Most functions on the LTC4155EUFD are controlled via the I2C serial interface. The LTC4155EUFD also provides extensive status information via the I2C serial interface.
Software & Systems Requirements
Tools & Simulations
Product Selector Card (1)
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.