USB power manager chip reduces battery charging time
26 March 2003
Power Electronics / Power Management
Linear Technology's LTC4410, a USB power manager IC in a ThinSOT package, enables simultaneous battery charging and system operation of a Li-Ion powered USB peripheral from a USB host. Compared to conventional methods, the company claims the LTC4410 powers the system load directly from USB's 5 V supply instead of the battery's 3,6 V terminal, allowing the battery to charge up to 39% faster.
By managing the total current consumption, the IC permits a 1-cell Li-Ion battery powered USB peripheral to charge its battery and operate its system circuitry without exceeding a user set current limit. Applications include USB certified Li-Ion powered devices such as portable printers, digital cameras, cellphones, and PDAs. The device also ensures USB overcurrent specifications by keeping total current constant from the USB port. Immediately after the USB cable is detached from the peripheral device, the device routes the system load to the battery for seamless and 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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