Power Electronics

Stepdown Converters Support Dynamic Voltage Scaling

Texas Instruments’ (TI) two dual-output, stepdown dc-dc converters with a single-pin serial interface technology support simple digital voltage scaling. The 95% efficient, 2.25-MHz fixed frequency devices help extend battery life in cell phones and other portable equipment.

The TPS62400 synchronous, dual-channel switcher with integrated FET technology supports up to 400 mA of output current on the first output and up to 600 mA on the second output over an input voltage range of 2.5 V to 6 V. Voltage accuracy for the device in PWM mode is 1%. The converter features TI’s one-pin EasyScale serial interface, which allows the device to adjust the output voltage dynamically during operation. The feature enables the TPS62400 to support dynamic voltage scaling when powering TI’s TMS320C5000 digital signal processors (DSPs) and OMAP processors.

The TPS62420 is a dual stepdown converter, optimized for portable industrial and medical equipment that deliver up to 600 mA on the first output and up to 1000 mA on second output. Both devices operate in a power-save mode at light-load currents and can be placed in a shutdown mode that reduces the power consumption to less than 1.2 µA. Quiescent current for the devices is 32 μA. Currently available, each device comes in a 10-pin 3 mm x 3 mm QFN. Pricing is $2.70 in 1000-piece quantities.

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