Semtech Debuts SC805/SC806 Miniature Battery Chargers
Semtech Corp. (Camarillo, CA), a producer of analog and mixed-signal semiconductors, debuted the new SC805 and SC806 ultra-small, battery charger devices, which are designed for consumer electronics applications, including cable chargers, personal media devices, and mobile phones. Both devices charge lithium-ion or lithium-polymer batteries, and are packaged in small 3 mm x 3 mm, thermally optimized, MLP packages. The chargers produce up to 1 A when operating in continuous-charge mode, and during high power-dissipation periods they behave like pulse chargers that regulate the internal die temperature to a safe level.
The SC805 and SC806 chargers feature an input-voltage range of 3 V to 6 V for seamless charging from a current-limited adapter. The SC805 and SC806 are designed with three programmable charge states, including a trickle-charge phase for deeply discharged batteries, a fast-charge phase, and a constant-voltage phase. In addition, the SC805 offers a programmable one-hour to 10-hour charge timer that protects a system from faulty batteries. The SC805 and SC806 feature precise line and load regulation, enabling the devices to control battery voltage to 1-percent accuracy. Once the charger reaches constant voltage mode, it gradually reduces battery output voltage until the termination voltage is reached, and then monitors battery voltage levels and initiates a new charge cycle if the battery voltage drops by more than 100 mV.
The SC805 and SC806 are fully integrated devices, including charger, FET pass transistor, reverse-blocking diode, sense resistor, and thermal protection. In addition to charging lithium-ion or lithium-polymer batteries, the devices can work as general-purpose current sources, or as current sources for charging nickel-cadmium and nickel-metal hydride batteries. The SC805 and SC806 can monitor a negative temperature coefficient pin to detect when the battery is not connected. The SC805 can work with or without a battery, functioning as a low dropout regulator when the battery is removed.
The SC805 is now available in production quantities, and is priced at $1.05 each in 10,000-piece lots. The SC806 is now available in production quantities, and is priced at $1.01 each in 10,000-piece lots.
