TPS62043

www.ti.com TPS62040 TPS62042, TPS62043 TPS62044, TPS62046 SLVS463B − JUNE 2003 − REVISED OCTOBER 2005 1.2 A/1.25 MHz, HIGH-EFFICIENCY STEP-DOWN CONVERTER FEATURES D Up to 95% Conversion Efficiency D Typical Quiescent Current: 18 µA D Load Current: 1.2 A D Operating Input Voltage Range: 2.5 V to 6.0 V D Switching Frequency: 1.25 MHz D Adjustable and Fixed Output Voltage D Power Save Mode Operation at Light load Currents D 100% Duty Cycle for Lowest Dropout D Internal Softstart D Dynamic Output Voltage Positioning D Thermal Shutdown D Short-Circuit Protection D 10 Pin MSOP PowerPad™ Package D 10 Pin QFN 3 X 3 mm Package APPLICATIONS D PDA, Pocket PC and Smart Phones D USB Powered Modems D CPUs and DSPs D PC Cards and Notebooks D xDSL Applications D Standard 5-V to 3.3-V Conversion DESCRIPTION The TPS6204x family of devices are high efficiency synchronous step-down dc-dc converters optimized for battery powered portable applications. The devices are ideal for portable applications powered by a single Li-Ion battery cell or by 3-cell NiMH/NiCd batteries. With an output voltage range from 6.0 V down to 0.7 V, the devices support low voltage DSPs and processors in PDAs, pocket PCs, as well as notebooks and subnotebook computers. The TPS6204x operates at a fixed switching frequency of 1.25 MHz and enters the power save mode operation at light load currents to maintain high efficiency over the entire load current range. For low noise applications, the devices can be forced into f...