SC1630

LOW VOLTAGE MULTI-MODE DC-DC CONVERTER January 30, 1998 SC1630 TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com DESCRIPTION The SC1630 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 an 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 can be internally set to 5V or externally set to an arbitrary value below breakdown voltage of the power switch. Logic-controlled shutdown mode is provided for power-saving. The low battery detector can also be configured as a linear regulator. A 120kHz switching rate reduces the inductor size. Inductors of 25µH to 50µH inductance are recommended for most applications. FEATURES Default +5V output voltage Adjustable output voltage with two resistors Power-saving shutdown mode (7µA typical) 120kHz switching rate On-chip low battery detector BLOCK DIAGRAM APPLICATIONS Palmtop and notebook computers Battery charger supply Cellular telephones LCD contrast supply Flash memory programmer Battery backup supplies Portable instruments PIN CONFIGURATION ORDERING INFORMATION DEVICE (1) PACKAGE SO-8 SC1630CS Note: (1) Add suffix ‘TR’ for tape and reel. ABSOLUTE MAXIMU...