High Efficiency Step-Down Converters with One-Pin EasyScale(TM) Interface Enable Dynamic Voltage Scaling in Portable Electronics
TI's new 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. The converter features TI's one-pin EasyScale(TM) serial interface, which allows the device to adjust the output voltage dynamically during operation. The feature allows the TPS62400 to support dynamic voltage scaling when powering TI's TMS320C5000(TM) digital signal processors (DSPs) and OMAP(TM) processors used in smart phones, PDAs and other portable equipment.
In addition to the TPS62400, TI introduced the TPS62420 dual step-down converter, optimized for portable industrial and medical equipment that deliver up to 600 mA on the first output and up to 1,000 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 uA.
Single-Chip Power Solution
The TPS62400 and TPS62420 save valuable board space, while providing extremely efficient power conversion without the need for external compensation. To save board space, each device comes in a small, 10-pin 3 mm x 3 mm QFN package, and a 2.25-MHz fixed frequency allows a portable designer to implement small inductors and capacitors.
Key Features of the TPS62400/420:95 Percent Efficiency at 2.25-MHz * Operation * Input Voltage Range from 2.5 V to 6 V * Dual-Output Current 400 mA and 600 mA * Adjustable Output Voltage from 0.6 V to Vin * One-Pin EasyScale(TM) Serial Interface for Dynamic Output Voltage Adjustment * 32 uA Typical Quiescent Current * Power Save Mode at Light Load Currents * 180 Degrees Out-of-Phase Operation * One Percent Output Voltage Accuracy in PWM Mode Available Today
The TPS62400 and TPS62420 is currently shipping in volume production. Suggested retail pricing is $2.70 in 1,000-piece quantities. Evaluation modules of the devices, application notes and TI's comprehensive portfolio of power management ICs are available through http://power.ti.com .
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