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USB power manager IC reduces battery charge time

Posted: 14 Feb 2003 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? ltc4410? usb power manager? power management ic? battery charger ic?

The LTC4410 USB power manager IC from Linear Technology Corp. enables simultaneous battery charging and system operation of a Li-ion-powered USB peripheral from a USB host, thereby reducing battery charging time. Applications include USB-certified Li-ion powered devices such as portable printers, digital cameras, cellphones, and PDAs.

Compared to conventional methods, the LTC4410 powers the system load directly form the USB's 5V supply instead of the battery's 3.6V terminal, allowing the battery to charge up to 39 percent faster.

The IC also ensures that a portable device is in compliance with USB overcurrent specifications by keeping the total current constant from the USB port. This is accomplished by adjusting the charge current relative to the amount of current demanded by the system load. When the SUB cable is detached from the peripheral device, the LTC4410 routes the system load to the battery for continuous operation of the end-device.

The LTC4410 is offered in a 6-lead ThinSOT package and is used with the LTC4053 Li-ion battery charger for USB applications or LTC1733 for general purpose Li-ion battery charging.

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