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LTC4099 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4099 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 36 page  LTC4099 1 4099f n Media Players n Portable Navigation Devices n Smart Phones n Industrial Handhelds n Portable Medical Instruments n Switching Regulator with Bat-TrackTM Adaptive Output Control Makes Optimal Use of Limited Input Power n I2C Port for Optimal System Performance and Status Information n Input Overvoltage Protection n Bat-Track Control of External Step-Down Switching Regulator Maximizes Efficiency from Automotive and Other High Voltage Sources n Instant-On Operation with Low Battery n Optional Overtemperature Battery Conditioner Improves High Temperature Battery Safety Margin n Ideal Diode Seamlessly Connects Battery When Input Power is Limited or Unavailable n Full-Featured Li-Ion/Polymer Battery Charger n 1.5A Maximum Charge Current with Thermal Limiting n Slew Control Reduces Switching EMI n Ultra-Thin (0.55mm) 20-Lead 3mm × 4mm QFN TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION I2C Controlled USB Power Manager/Charger with Overvoltage Protection The LTC®4099 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 volt- age 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 LTC4099 from high voltage damage on the low voltage VBUS pin. The LTC4099 is available in the ultra-thin (0.55mm) 20-lead 3mm × 4mm QFN surface mount package. I2C Controlled High Efficiency Battery Charger/ USB Power Manager Reduced Power Dissipation vs Linear Battery Charger VBUS USB OVERVOLTAGE PROTECTION 10μF 10μF 0.1μF 3.01k 1.02k 6.2k TO μCONTROLLER SYSTEM LOAD 4099 TA01a CLPROG PROG LTC4099 GND SW 3.3μH NTC OVSENS I2C OVGATE VOUT BAT BATSENS NTCBIAS 2 Li-Ion 100k 100k T + , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. PowerPath and Bat-Track are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6522118, 6570372, 6700364, 6819094. Other patents pending. LINEAR BATTERY CHARGER SWITCHING BATTERY CHARGER BATTERY VOLTAGE (V) 3.3 1.2 1.4 1.6 4 1.0 0.8 3.5 3.7 3.4 3.6 3.8 3.9 4.1 0.2 0 0.6 1.8 0.4 4099 TA01b VIN = 5V ICHARGE = 1A ADDITIONAL POWER AVAILABLE FOR CHARGING |
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