2
LT1304/LT1304-3.3/LT1304-5
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
U
V
IN
Voltage ................................................................ 8V
SW Voltage ............................................... –0.4V to 25V
FB Voltage (LT1304)...................................... V
IN
+ 0.3V
Sense Voltage (LT1304-3.3/LT1304-5) ..................... 8V
I
LIM
Voltage .............................................................. 5V
SHDN Voltage ............................................................ 6V
LBI Voltage ............................................................... V
IN
LBO Voltage............................................................... 8V
Maximum Power Dissipation ............................. 500mW
Junction Temperature.......................................... 125°C
Operating Temperature Range ..................... 0°C to 70°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
LT1304CS8
LT1304CS8-3.3
LT1304CS8-5
1304
13043
13045
S8 PART MARKING
ORDER PART
NUMBER
1
2
3
4
8
7
6
5
TOP VIEW
LBI
LBO
V
IN
SW
FB (SENSE)*
SHDN
I
LIM
GND
S8 PACKAGE
8-LEAD PLASTIC SO
*FIXED OUTPUT VERSION
T
JMAX
= 125°C, θ
JA
= 150°C/W
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Operating Voltage ● 1.5 1.65 V
Operating Voltage Range ● 8V
Quiescent Current V
SHDN
= 2V, Not Switching ● 120 200 µA
Quiescent Current in Shutdown V
SHDN
= 0V, V
IN
= 2V ● 715 µA
V
SHDN
= 0V, V
IN
= 5V ● 27 50 µA
Comparator Trip Point LT1304 ● 1.22 1.24 1.26 V
FB Pin Bias Current LT1304 ● 10 25 nA
Sense Pin Leakage in Shutdown V
SHDN
= 0V, Fixed Output Versions ● 0.002 1 µA
Output Sense Voltage LT1304-3.3 ● 3.17 3.3 3.43 V
LT1304-5
● 4.80 5.05 5.25 V
Line Regulation 1.8V ≤ V
IN
≤ 8V ● 0.04 0.15 %/V
LBI Input Threshold Falling Edge ● 1.10 1.17 1.25 V
LBI Bias Current ● 620 nA
LBI Input Hysteresis ● 35 65 mV
LBO Output Voltage Low I
SINK
= 500µA ● 0.2 0.4 V
LBO Output Leakage Current LBI = 1.5V, LBO = 5V ● 0.01 0.1 µA
SHDN Input Voltage High ● 1.4 V
SHDN Input Voltage Low
● 0.4 V
SHDN Pin Bias Current V
SHDN
= 5V ● 58 µA
V
SHDN
= 0V ● –5 –2 µA
Switch OFF Time ● 1 1.5 2 µs
Switch ON Time Current Limit Not Asserted ● 468 µs
Maximum Duty Cycle Current Limit Not Asserted ● 76 80 88 %
Peak Switch Current I
LIM
Pin Open, V
IN
= 5V 0.8 1 1.2 A
20k from I
LIM
to GND 500 mA
V
IN
= 2V, V
SHDN
= 2V unless otherwise noted.
E
LECTR
IC
AL C CHARA TERIST
ICS
Consult factory for Industrial and Military grade parts.
