I˛C Programmable 1.5A USB/AC Li-Ion Charger and Input/Output Power Manager Solves Tough Portable Power Challenges
22.10.2007
The SMB137 is a programmable single-cell LiIon Battery charger IC, desigend for a variety of portable applications.
The device provides a simple and efficient way to charge high-capacity LiIon batteries via a USB or AC adapter input. Unlike conventional charging devices, the SMB137's high-efficiency switch-mode operation eliminates the low charge current and thermal problems of conventional linear solutions. Also the switching architecture in conjunction with programmability enables dramatically faster charging - TurboCharge™ mode - from current limited in puts such as USB.
The SMB137 can switch between USB mode and AC Adapter mode and works seamlessly in conjunction with a USB controller. Also the SMB137 can manage two outputs independently: battery charging and system power. This allows immediate system operation even under missing/deeply discharged battery conditions. Also in the case of a low battery and insufficient/missing input supply the SMB137 can run its switching regulator in reverse to support “Low Battery Recovery” mode or USB “On the Go” power (+5V @ 500mA).
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