LT3505
ELECTRICAL CHARACTERISTICS The " denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, VIN = 12V, VBOOST = 17V, unless otherwise noted. (Note 2).
PARAMETER
CONDITIONS
MIN
3.6
TYP
MAX
36
UNITS
V
VIN Operating Range
Undervoltage Lockout
Feedback Voltage
3.1
3.35
780
55
3.6
795
150
2.7
2
V
"
"
765
mV
nA
FB Pin Bias Current
Quiescent Current
VFB = Measured VREF (Note 4)
Not Switching, RT = 75.0k
VSHDN = 0V
2.0
mA
µA
Quiescent Current in Shutdown
Reference Line Regulation
Switching Frequency
0.01
0.007
VIN = 5V to 36V
%/V
VFB = 0.7V, RT = 13.7k
2.70
675
180
3.01
750
200
3.30
825
220
MHz
kHz
kHz
V
FB = 0.7V, RT = 75.0k
FB = 0.7V, RT = 357k
V
"
Maximum Duty Cycle
Error Amp Transconductance
Error Amp Voltage Gain
VC Source Current
RT = 75.0k
90
94
200
400
10
%
µA/V
V/V
µA
VFB = 0.78V
VFB = 0.78V
VFB = 0V, VC = 1.5V
VFB = 1V, VC = 1.5V
IOUT = 0mA
VC Sink Current
14
µA
VC Switching Threshold Voltage
VC Clamp Voltage
0.9
1.7
V
VFB = 0V
V
RT Bias Voltage
VFB = 0.6V
0.5
50
V
mV
V
FB = 0V, RT = 75.0k
Switch Current Limit
(Note 3)
ISW = 1A
1.4
2.3
1.75
350
0.1
1.6
24
2.2
A
mV
µA
V
Switch VCESAT
Switch Leakage Current
Minimum Boost Voltage Above Switch
BOOST Pin Current
2
ISW = 1A
ISW = 1A
2.2
50
mA
V
SHDN Input Voltage High
SHDN Input Voltage Low
SHDN Bias Current
0.3
V
VSHDN = 2.3V (Note 5)
VSHDN = 0V
6
0.01
20
0.1
µA
µA
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 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.
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.
3505fc
3
Linear [ Linear ]
