400 mA step-down converters help increase battery life in portable devices

11 February 2004 Power Electronics / Power Management

Extending efforts to improve system run-times in application processor-powered and digital signal processing-based portable devices, Texas Instruments designed and has released a family of 400 mA, synchronous DC/DC step-down converters with ultra-low quiescent current and up to 95% power efficiency. The new high performance power management converters (TPS6222x family) are suited for portable systems powered by single-cell lithium-ion (Li-Ion) or three-cell alkaline or nickel metal-hydride (NiMH) batteries.

These step-down converters support an input voltage range from 2,5 to 6 V, an output voltage range of 6 V down to 0,7 V and output current up to 400 mA. The converters operate with a fixed switching frequency of 1,25 MHz (typical). To provide additional power savings, the TPS6222x enters a 'power save mode' operation at light load currents. In this mode, the manufacturer says that the switching frequency is reduced and quiescent current is typically only 15 µA, resulting in the highest efficiency over the entire load current range. Additionally, an advanced fast response voltage mode control scheme achieves excellent line and load regulation with small ceramic input and output capacitors.

For more information contact Analog Data Products, a division of Avnet Kopp, 011 809 6100.

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