AIC1630

AIC1630 2-Cell, Step-Up DC/DC Converter Controller FEATURES Adjustable Output Voltage with Two Resistors (AIC1630A). Power-Saving Shutdown Mode (7µA typical). 120KHz Switching Rate. On-Chip Low Battery Detector. DESCRIPTION The AIC1630 is a DC-DC converter designed to drive an external power switch for more flexibility, especially in higher voltage and larger power applications. Typically six components are required to set up a step up configuration easily achieving efficiency beyond 80%. A few more components are required to set up a step down configuration delivering 4A load current with 83% typical efficiency, 86% at 2A load, and 300µA quiescent current. The output voltage is internally set to 3V, 3.3V, 5V or externally set to an arbitrary value below breakdown voltage of the power switch. Logiccontrolled shutdown mode is provided for power saving. The low battery detector can be also configured as a linear regulator. 120KHz switching rate reduces the inductor size. Inductors of 25µH to 50µH inductance are recommended for most applications. APPLICATIONS Palmtop & Notebook Computers. Battery Charger Supply. Cellular Telephone. LCD Contrast Supply. Flash Memory Programmer. Battery Backup Supplies. Portable Instruments. TYPICAL APPLICATION CIRCUIT +VIN 100Ω 100µF R3 L D1 1N5819 2SC4672 50µH C1 + SD VIN EXT 100µF C3 LOAD Q1 1 SGND 270Ω R4 VOUT LBI LBO CGND +VOUT 3.3V 5nF C2 AIC1630 Note : VIN ≥ 1.8V , VOUT ≤ 7V High Efficiency Step-Up DC/DC Converter Analog Integratio...