LT3505
ELECTRICAL CHARACTERISTICS
PARAMETER
V
IN
Operating Range
Undervoltage Lockout
Feedback Voltage
FB Pin Bias Current
Quiescent Current
Quiescent Current in Shutdown
Reference Line Regulation
Switching Frequency
V
FB
= Measured V
REF
(Note 4)
Not Switching, R
T
= 75.0k
V
SHDN
= 0V
V
IN
= 5V to 36V
V
FB
= 0.7V, R
T
= 13.7k
V
FB
= 0.7V, R
T
= 75.0k
V
FB
= 0.7V, R
T
= 357k
R
T
= 75.0k
V
FB
= 0.78V
V
FB
= 0.78V
V
FB
= 0V, V
C
= 1.5V
V
FB
= 1V, V
C
= 1.5V
I
OUT
= 0mA
V
FB
= 0V
V
FB
= 0.6V
V
FB
= 0V, R
T
= 75.0k
(Note 3)
I
SW
= 1A
I
SW
= 1A
I
SW
= 1A
2.3
0.3
V
SHDN
= 2.3V (Note 5)
V
SHDN
= 0V
6
0.01
20
0.1
1.4
"
"
"
The
"
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 12V, V
BOOST
= 17V, unless otherwise noted. (Note 2).
CONDITIONS
MIN
3.6
3.1
765
3.35
780
55
2.0
0.01
0.007
2.70
675
180
90
3.01
750
200
94
200
400
10
14
0.9
1.7
0.5
50
1.75
350
0.1
1.6
24
2
2.2
50
2.2
3.30
825
220
TYP
MAX
36
3.6
795
150
2.7
2
UNITS
V
V
mV
nA
mA
µA
%/V
MHz
kHz
kHz
%
µA/V
V/V
µA
µA
V
V
V
mV
A
mV
µA
V
mA
V
V
µA
µA
Maximum Duty Cycle
Error Amp Transconductance
Error Amp Voltage Gain
V
C
Source Current
V
C
Sink Current
V
C
Switching Threshold Voltage
V
C
Clamp Voltage
R
T
Bias Voltage
Switch Current Limit
Switch V
CESAT
Switch Leakage Current
Minimum Boost Voltage Above Switch
BOOST Pin Current
SHDN Input Voltage High
SHDN Input Voltage Low
SHDN Bias Current
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LT3505E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LT3505I specifications are
guaranteed over the –40°C to 125°C temperature range.
Note 3:
Current limit guaranteed by design and/or correlation to static test.
Slope compensation reduces current limit at higher duty cycle.
Note 4:
Current flows out of pin.
Note 5:
Current flows into pin.
3505fc
3
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