SP6641B

® SP6641A/6641B 500mA Alkaline DC/DC Boost Regulator in SOT-23 s Ultra Low Quiescent Current: 10µA s Wide Input Voltage Range: 0.9V to 4.5V s 90mA IOUT at 1.3V Input (SP6641A-3.3V) s 500mA IOUT at 2.6V Input (SP6641B-3.3V) s 100mA IOUT at 2.0V Input (SP6641A-5.0V) s 500mA IOUT at 3.3V Input (SP6641B-5.0V) s Fixed 3.3V or 5.0V Output Voltage s Up to 87% Efficiency s 0.3Ω NFET RDSon s Startup Voltage Guaranteed at 0.9V s 0.33A Inductor Current Limit (SP6641A) s 1A Inductor Current Limit (SP6641B) s Logic Shutdown Control s SOT-23-5 Package LX 1 5 VBATT SP6641 GND 2 5 Pin SOT-23 VOUT 3 4 SHDN APPLICATIONS s PDA's s DSC's s CD/MP3 Players s Pagers s Digital Cameras s Portable Handheld Medical Devices DESCRIPTION The SP6641 is an ultra-low quiescent current, high efficiency, DC-DC boost converter designed for single and dual cell alkaline, or Li-ion battery applications found in PDA’s, MP3 players, and other handheld portable devices. The SP6641 features a 10µA quiescent current, a 0.3Ω Nchannel charging switch, 0.9V input startup, and a 0.33A or 1.0A inductor current limiting feature. The SP6641 is offered in a 5 pin SOT-23 package and provides an extremely small power supply footprint optimized for portable applications. The SP6641 is preset to 3.3V and can be controlled by a 1nA active LOW shutdown pin. L1 0.9V to 4.5V VBATT VBATT 5 ® 1 LX D1 2 GND 3 VOUT R1 C3 C1 U1 SP6641A SHDN SHDN IOUT (mA) 4 C2 VOUT +3.3V or 5V SP6641A 3.3V & 5V: C1 = C2 = 22µF Ceramic, L...