Semtech Unveils SC801 Lithium-Ion Battery-Charger
Semtech Corp. (Newbury Park, CA) announced the SC801 highly integrated, high-current lithium-ion battery-charger chip. According to the company, by packing the programmable lithium-ion battery-charging system into a tiny, thermally-efficient package, the SC801 reduces cost, design time and circuit board real estate. Applications include cellular phones, personal digital assistants, digital cameras, hand-held computers, and other portable and battery-powered electronic products. The SC801 also works as a charging system for nickel-cadmium and nickel-metal-hydride batteries or as a general-purpose programmable current source.
The SC801 features battery monitoring and protection, a fast-charge current of up to 1.5A, input voltages from 4.2 to 14V to yield a selectable output of either 4.1V or 4.2V regulated to ±1 percent accuracy, and combines a controller, a thermally protected power MOSFET, a reverse blocking diode, and a sense resistor on a single die mounted in a 1.0mm high, 4mm-x-4mm micro-leaded package. The package also features a 50 degrees C per watt junction-to-ambient thermal resistance, and an exposed copper heatsink that makes direct contact with a printed-circuit board pad. Additional space savings are gained by the chip's use of small input and output filter capacitors.
The SC801 also features soft-start operation in the event of step loads or, for when a power adapter is connected, step inputs. All charge modes are protected against over-current and over-voltage conditions. To save power, the SC801 draws just 1µA in monitor and shutdown modes.
The SC801 lithium-ion battery-charger chip is packaged in a 4mm-x-4mm MLP and is available now. Pricing starts at $1.67 in 1,000-unit quantities.
