Features

• Switching Regulator with Bat-Track™ Adaptive Output Control Makes Optimal Use of Limited Input Power
• I²C Port for Optimal System Performance and Status Information
• Input Overvoltage Protection
• Bat-Track Control of External Step-Down Switching Regulator Maximizes Efficiency from Automotive and Other High Voltage Sources
• Instant-On Operation with Low Battery
• Optional Overtemperature Battery Conditioner Improves High Temperature Battery Safety Margin
• Ideal Diode Seamlessly Connects Battery When Input Power is Limited or Unavailable
• Full-Featured Li-Ion/Polymer Battery Charger
• 1.5A Maximum Charge Current with Thermal Limiting
• Slew Control Reduces Switching EMI
• 20-Lead 3mm × 4mm × 0.75mm QFN Package

Typical Application

Description

The LTC4099 is an I²C controlled high efficiency USB PowerPath controller and full-featured Li-Ion/Polymer battery charger. It seamlessly manages power distribution from multiple sources including USB, a wall adapter and a Li-Ion/Polymer battery.

The LTC4099 automatically limits its input current for USB compatibility. For automotive and other high voltage applications, the LTC4099 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.

The I²C port allows digital control of important application parameters including input current limit, charge current and float voltage. Several status bits can also be read back via I²C.

An overvoltage protection circuit guards the LTC4099from high voltage damage on the low voltage V_BUS pin.TheLTC4099 is available in a 20-Lead 3mm × 4mm × 0.75mmQFN Package.