Datasheet

2
LT1303/LT1303-5
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
Q
Quiescent Current V
SHDN
= 0.5V, V
SEL
= 5V, V
SENSE
= 5.5V ● 120 200 µA
V
SHDN
= 1.8V ● 715 µA
V
IN
Input Voltage Range 1.8 1.55 V
● 2.0 V
Feedback Voltage LT1303 ● 1.22 1.24 1.26 V
Output Sense Voltage LT1303-5 ● 4.8 5.0 5.2 V
Comparator Hysteresis LT1303 (Note 1) ● 6 12.5 mV
Output Hysteresis LT1303-5 (Note 1) ● 22 50 mV
Feedback Pin Bias Current LT1303, 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
= 700mA ● 130 200 mV
Switch Leakage Current V
SW
= 5V, Switch Off ● 0.1 10 µA
Peak Switch Current V
IN
= 2V ● 0.75 1.0 1.25 A
V
IN
= 5V 0.65 0.9 1.15 A
LBI Trip Voltage ● 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
ABSOLUTE MAXIMUM RATINGS
W
WW
U
V
IN
Voltage .............................................................. 10V
SW1 Voltage ............................................................ 25V
Sense Voltage (LT1303-5) ....................................... 20V
FB Voltage (LT1303)................................................ 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
PACKAGE/ORDER INFORMATION
W
U
U
T
A
= 25°C, V
IN
= 2.0V, unless otherwise noted.
E
LECTR
IC
AL C CHARA TERIST
ICS
Note 1: Hysteresis specified is DC. Output ripple may be higher if output
capacitance is insufficient or capacitor ESR is excessive.
The
● denotes specifications which apply over the 0°C to 70°C operating
temperature range.
ORDER PART
NUMBER
LT1303CN8
LT1303CS8
LT1303CN8-5
LT1303CS8-5
S8 PART MARKING
1303
13035
Consult factory for Industrial and Military grade parts.
1
2
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4
8
7
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5
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TOP VIEW
GND
LBO
SHDN
FB (SENSE)*
PGND
SW
V
IN

LBI
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
*FIXED VERSION
T
JMAX
= 100°C, θ
JA
= 130°C/W (N8)
T
JMAX
= 100°C, θ
JA
= 150°C/W (S8)