l ’ LINE I \p SPECIFICATION NOTICE TECHNOLOGY 47 ABSOLUTE AXI U RA11 G
SPECIFICATION NOTICE
LT1308
March 1999
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
The specifications for the LT®1308 have been revised as shown in bold type below. For com-
plete specifications, typical performance characteristics and applications information, please
see the LT1308 data sheet.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ELECTRICAL C CHARA TERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IBFB Pin Bias Current (Note 3)V
FB = VREF 27 80 nA
Switch Current Limit (Note 4) DC = 40% 2.0 2.5 A
DC = 80% 1.6 2 A
LBI Input Bias Current (Note 5)V
LBI = 150mV 530 nA
Reverse Battery Current (Note 6) 750 mA
Maximum Duty Cycle 80 88 98 %
Commercial Grade 0°C to 70°C. VIN = 1.1V, VSHDN = VIN, TA = 25°C unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IBFB Pin Bias Current (Note 3)V
FB = VREF 27 80 nA
Switch Current Limit (Note 4) DC = 40% 2.0 2.5 A
DC = 80% 1.6 2 A
LBI Input Bias Current (Note 5)V
LBI = 150mV 530 nA
Maximum Duty Cycle 80 88 98 %
Industrial Grade –40°C to 85°C. VIN = 1.2V, VSHDN = VIN, TA = 25°C unless otherwise noted.
ABSOLUTE MAXIMUM RATINGS
W
WW
U
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
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.
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 V
IN
and SW are grounded.