SPECIFICATION NOTICE LT1308 March 1999 The specifications for the LT®1308 have been revised as shown in bold type below. For complete specifications, typical performance characteristics and applications information, please see the LT1308 data sheet. , LTC and LT are registered trademarks of Linear Technology Corporation. U W W W ABSOLUTE MAXIMUM RATINGS Operating Temperature Range Commercial ........................................ – 20°C to 70°C Extended Commercial (Note 1) ....... – 40°C to 85°C Industrial (Note 2)....................... – 40°C to 85°C ELECTRICAL CHARACTERISTICS Commercial Grade 0°C to 70°C. VIN = 1.1V, VSHDN = VIN, TA = 25°C unless otherwise noted. SYMBOL IB PARAMETER FB Pin Bias Current (Note 3) Switch Current Limit (Note 4) LBI Input Bias Current (Note 5) Reverse Battery Current Maximum Duty Cycle CONDITIONS VFB = VREF DC = 40% DC = 80% VLBI = 150mV (Note 6) MIN MAX 80 80 TYP 27 2.5 2 5 750 88 98 UNITS nA A A nA mA % MIN TYP MAX UNITS 27 80 2.0 1.6 2.5 2 ● ● 2.0 1.6 ● ● 30 Industrial Grade – 40°C to 85°C. VIN = 1.2V, VSHDN = VIN, TA = 25°C unless otherwise noted. SYMBOL PARAMETER CONDITIONS IB FB Pin Bias Current (Note 3) VFB = VREF ● Switch Current Limit (Note 4) DC = 40% DC = 80% ● LBI Input Bias Current (Note 5) VLBI = 150mV ● Maximum Duty Cycle The ● denotes specifications which apply over the full operating temperature range. Note 1: C grade device specifications are guaranteed over the 0°C to 70°C temperature range (some parameters are also guaranteed to – 20°C as denoted on the data sheet). In addition, C grade device specifications are assured over the – 40°C to 85°C temperature range by design or correlation, but are not production tested. Note 2: I grade specifications are guaranteed over the – 40°C to 85°C temperature range. ● 80 nA A A 5 30 nA 88 98 % Note 3: Bias current flows in to FB pin. Note 4: Switch current limit guaranteed by design and/or correlation to static test. Duty cycle affects current limit due to ramp generator (see Block Diagram). Note 5: Bias current flows out of LBI pin. Note 6: The LT1308 will withstand continuous application of 1.6V applied to GND pin while VIN and SW are grounded. For further information regarding this specification notice contact: Linear Technology Corporation 1630 McCarthy Blvd. Milpitas, California 95035-7417 Attn: Product Marketing Manager Phone: (408) 432-1900 sn1308a ©1998 LT/HP 0399 • PRINTED IN USA