2
LT1305
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
WU
U
PACKAGE
/
O
RDER I FOR ATIO
V
IN
Voltage .............................................................. 10V
SW1 Voltage ............................................................ 25V
FB Voltage ............................................................... 10V
Shutdown Voltage ................................................... 10V
LBO Voltage............................................................. 10V
LBI Voltage .............................................................. 10V
Maximum Power Dissipation ............................. 500mW
Operating Temperature Range ..................... 0°C to 70°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
Consult factory for Industrial and Military grade parts.
S8 PART MARKING
1305
LT1305CS8
T
JMAX
= 100°C, θ
JA
= 80°C/ W
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
Q
Quiescent Current V
SHDN
= 0.5V, V
FB
= 2V ● 120 200 µA
V
SHDN
= 1.8V ● 715 µA
V
IN
Input Voltage Range 1.8 1.55 V
● 2.0 V
Feedback Voltage ● 1.22 1.24 1.26 V
Comparator Hysteresis ● 6 12.5 mV
Feedback Pin Bias Current V
FB
= 1V ● 720 nA
Oscillator Frequency Current Limit Not Asserted 120 155 185 kHz
Oscillator TC 0.2 %/°C
DC Maximum Duty Cycle ● 75 86 95 %
t
ON
Switch On Time Current Limit Not Asserted 5.6 µs
Output Line Regulation 1.8V < V
IN
< 6V ● 0.06 0.15 %/V
V
CESAT
Switch Saturation Voltage I
SW
= 1A ● 140 280 mV
Switch Leakage Current V
SW
= 5V, Switch Off ● 0.1 10 µA
Peak Switch Current V
IN
= 2V 1.35 2 2.35 A
● 1.20 2.50 A
V
IN
= 5V 1.15 2.15 A
LBI Trip Voltage (Note 2) ● 1.21 1.24 1.27 V
LBI Input Bias Current V
LBI
= 1V ● 720 nA
LBO Output Low I
LOAD
= 100µA ● 0.11 0.4 V
LBO Leakage Current V
LBI
= 1.3V, V
LBO
= 5V ● 0.1 5 µA
V
SHDNH
Shutdown Pin High ● 1.8 V
V
SHDNL
Shutdown Pin Low 0.5 V
I
SHDN
Shutdown Pin Bias Current V
SHDN
= 5V ● 8.0 20 µA
V
SHDN
= 2V ● 3.0 µA
V
SHDN
= 0V ● 0.1 1 µA
T
A
= 25°C, V
IN
= 2.0V, unless otherwise noted.
E
LECTR
IC
AL C CHARA TERIST
ICS
The ● denotes specifications which apply over the 0°C to 70°C operating
temperature range.
Note 1: Hysteresis specified is DC. Output ripple may be higher if output
capacitance is insufficient or capacitor ESR is excessive.
Note 2: Low-battery detector comparator is inoperative when device is in
shutdown.
1
2
3
4
8
7
6
5
TOP VIEW
PGND
SW
V
IN
LBI
GND
LBO
SHDN
FB
S8 PACKAGE
8-LEAD PLASTIC SO
