Datasheet

2
LT1611
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
U
ORDER PART
NUMBER
LT1611CS5
T
JMAX
= 125°C, θ
JA
= 256°C/W
S5 PART MARKING
LTES
Consult factory for Industrial and Military grade parts.
SW 1
GND 2
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC SOT-23
NFB 3
5 V
IN
4 SHDN
(Note 1)
V
IN
Voltage .............................................................. 10V
SW Voltage ................................................–0.4V to 36V
NFB Voltage ............................................................. –3V
Current into NFB Pin ............................................. ±1mA
SHDN Voltage .......................................................... 10V
Maximum Junction Temperature .......................... 125°C
Operating Temperature Range
Commercial ............................................. 0°C to 70°C
Extended Commercial (Note 2)........... –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................300°C
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Operating Voltage 0.9 1.1 V
Maximum Operating Voltage 10 V
NFB Pin Bias Current V
NFB
= –1.23V ● –2.7 –4.7 –6.7 µA
Feedback Voltage ● –1.205 –1.23 –1.255 V
Quiescent Current V
SHDN
= 1.5V, Not Switching 3 4.5 mA
Quiescent Current in Shutdown V
SHDN
= 0V, V
IN
= 2V 0.01 0.5 µA
V
SHDN
= 0V, V
IN
= 5V 0.01 1.0 µA
Reference Line Regulation 1.5V ≤ V
IN
≤ 10V 0.02 0.2 %/V
Switching Frequency ● 1.0 1.4 1.8 MHz
Maximum Duty Cycle ● 82 86 %
Switch Current Limit (Note 3) 550 800 mA
Switch V
CESAT
I
SW
= 300mA 300 350 mV
Switch Leakage Current V
SW
= 5V 0.01 1 µA
SHDN Input Voltage High 1V
SHDN Input Voltage Low 0.3 V
SHDN Pin Bias Current V
SHDN
= 3V 25 50 µA
V
SHDN
= 0V 0 0.1 µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: C grade device specifications are guaranteed over the 0°C to 70°C
temperature range. 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 3: Current limit guaranteed by design and/or correlation to static test.
Slope compensation reduces current limit at higher duty cycle.
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 1.5V, V
SHDN
= V
IN
unless otherwise noted.