AIC1641

AIC1641 Low Voltage Step-Up DC/DC Controller FEATURES l A Guaranteed Start-Up from less than 0.9 V. l High Efficiency. l Low Quiescent Current. l Fixed or adjustable Output Voltage. l Logic Controlled Shutdown. l External Switch Driver for High Power Level Appli- cation. APPLICATIONS l Pagers. l Cameras. l Wireless Microphones. l Pocket Organizers. l Battery Backup Suppliers. l Portable Instruments. DESCRIPTION The AIC1641 is a high efficiency step-up DC/DC controller for applications using 1 to 4 battery cells. Only three external components are required to deliver a fixed output voltage of 2.7V, 3.0V, 3.3V, or 5.0V. Pulse Frequency Modulation scheme brings optimized performance for applications with light output loading and low input voltage. The output ripple and noise are lower compared with the circuit operating in PSM mode. The AIC1641 starts up from less than 0.9V input to boost either 2.7V, 3.0V, 3.3V, or 5.0V output with 1mA load. Shutdown mode is one of the features that ma...