ACT6305

www.DataSheet4U.com ACT6305 Low Input High Efficiency Synchronous Step-Up DC/DC Converter FEATURES 1V Typical Startup Voltage Up to 94% Efficiency Fully Integrated Power Stage Fixed 3.3V/5V or Adjustable Output Voltage NanoStandbyTM Shutdown Mode Tiny SOT23-5 Package − RoHS Compliant Package Rev0, 13-May-08 GENERAL DESCRIPTION The ACT6305 is a high efficiency synchronous step-up DC/DC converter that consumes just 17µA of quiescent supply current and is capable of delivering more than 400mA output current using only three external components. This device achieves a typical startup voltage of just 1V, making it ideal for applications operating from 1 or 2 alkaline cells. This device incorporates an internal synchronous rectifier, and achieves excellent peak efficiency of up to 94% and features a proprietary control scheme that ensures high efficiency over a wide load current range. The ACT6305 features pin-selectable output voltages of 3.3V or 5V, or it can also be set externally to any voltage between 2V and 5V. The ACT6305 is available in a tiny SOT23-5 package. APPLICATIONS Hand-Held Devices One to Three Cell Battery Operated Devices PDAs Cellular Phones Digital Cameras GPS TYPICAL APPLICATION CIRCUIT Efficiency vs. Output Current VIN L 6.8µH LX OUT VOUT 100 90 ACT6305-001 Efficiency (%) ENABLE ACT6305 EN G FB C2 22µF 80 VIN = 5V 70 VIN = 3.5V 60 VIN = 1.2V VIN = 2.4V C1 22µF Pb-free 50 40 30 0.1 1.0 10 100 VOUT = 5V 1000 Output Curr...