Power converter

Giving portable designers the ability to extend battery life in smaller designs, Texas Instruments has launced a new step-down DC/DC converter for space-constrained applications.

The TPS62300 power management IC is ideal for smart phones, WLAN and Bluetooth equipment, digital still cameras and other battery powered devices.

The synchronous, switch-mode device sports a step-down, 500-mA converter with integrated FETs and comes in a lead-free, 2 mm x 1 mm chip scale package. It achieves up to 93 percent power conversion efficiency while operating at a fixed frequency of 3-MHz.

The device can deliver DC voltage regulation accuracy from -0.5% to 1.3% over the entire industrial temperature range. In addition, the device’s load transient response and output voltage range of 5.4 V down to 0.6V, allows it to effectively support demanding core power requirements of low-voltage processors.

In addition to the TPS62300 step-down IC, TI also announced today a new family of synchronous switch, 600-mA DC/DC boost converters for designers of small, simple, battery-powered equipment, including wireless and PC accessories, such as headsets and pointing devices.

The new TPS6107x family, available in a six-pin, 3 mm x 3 mm ThinSOT-23 package, supports input voltages of 0.9V to 5.5V, and generates output voltages up to 5.5V at greater than 90% power efficiency using a small 4.7µH inductor and ceramic capacitors.

The TPS6107x devices are ideal for small portable applications that use one or two Alkaline or nickel metal-hydride (NiMH) batteries, or a single-cell lithium-ion (Li-Ion) battery. The converters feature a low quiescent current of 15µA typical and a maximum shutdown current of 1uA to conserve battery power. The TPS6107x devices operate at 1.2-MHz, and can deliver output currents in excess of 75-mA at 3.3 V from a 0.9 V supply and 150-mA at 3.3 V from a 1.8 V supply. The output voltage is adjustable through the use of an external resistor divider. The TPS61070 features a light-load efficient pulse-frequency modulation (PFM) mode, while the TPS61071 operates in a pulse-width modulation (PWM) mode.

The TPS6230x and TPS6107x families of converters are available today in volume from TI and its authorized distributors. The TPS6230x DC/DC converters come in an eight-pin, wafer chip scale (2 mm x 1 mm) package or a 10-pin QFN (3 mm x 3 mm) package, and are priced at $1.85 each in quantities of 1,000 units.

The synchronous TPS6107x devices come in a six-pin, ThinSOT-23 package, and are priced in quantities of 1,000 at $0.95 per unit.

On the web