SC1631

LOW VOLTAGE STEP-UP DC-DC CONVERTER January 29, 1998 SC1631 TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com DESCRIPTION The SC1631 is a high efficiency step up DC-DC converter. Only four external components are required to deliver a fixed voltage of 3V, 3.3V, or 5V. Efficiency beyond 87% can be easily achieved at 100mA load with 2.2V to 3V input voltages. A logic-controlled shutdown mode is provided for power saving. Switch current limit can be programmed with a resistor. The low battery detector can be configured as a linear regulator or a burst mode controller providing extremely low supply current operation. A switching rate of 120kHz reduces the inductor size inductors of 25µH to 50µH are recommended for most applications. FEATURES High efficiency 90% Power-saving shutdown mode (7µA typical) Internal 2A switch 120kHz switching rate Adjustable switch current limit On-chip low battery detector APPLICATIONS Palmtop and notebook computers Pocket organizers Cameras Pagers Battery backup supplies Portable instruments BLOCK DIAGRAM ORDERING INFORMATION DEVICE (1) OUTPUT VOLTAGE 3.3V 3.0V 5.0V PACKAGE SO-8 SC1631CS SC1631-3CS SC1631-5CS Note: (1) Add suffix ‘TR’ for tape and reel. PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS Parameter Supply Voltage Operating Temperature Range Storage Temperature Range Symbol Maximum VIN TA TSTG 7.0 0 to 70 -65 to 125 Units V °C °C © 1997 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 LOW V...