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LT3477
ELECTRICAL CHARACTERISTICS The ● indicates speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T A = 25°C. V IN = 2.5V, V SHDN = 2.5V.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Maximum V REF Pin Current
Soft-Start Pin Current
Out of Pin
SS = 0.5V, Out of Pin
9
100
μA
μA
FBP Pin Bias Current
FBN Pin Bias Current
25
25
100
100
nA
nA
Feedback Ampli?er Offset Voltage
FBP – FBN, V C = 1V
–2
2
6
mV
Feedback Ampli?er Voltage Gain
Voltage Feedback Ampli?er Transconductance
500
500
V/V
μS
Feedback Ampli?er Sink Current
Feedback Ampli?er Source Current
V FBP = 1.25V, V FBN = 1.5V, V C = 1V
V FBP = 1.25V, V FBN = 1V, V C = 0.5V
10
10
μA
μA
Current Sense Ampli?er Sense Voltage
Switching Frequency
Maximum Switch Duty Cycle
Switch Current Limit
Switch V CESAT
Switch Leakage Current
SHDN Pin Current
Positive Rail, V CM = 25V, E Grade
Positive Rail, V CM = 25V, I Grade
Ground
R T = 17.2k
R T = 107.4k
R T = 2.44k
R T = 17.2k
(Note 3)
I SW = 1A (Note 3)
SW = 40V
V SHDN = 5V
●
●
●
97.5
97.5
88
0.9
160
2.7
87
3
100
100
100
1
200
3.5
93
4
150
0.2
30
102.5
103
112
1.15
240
4.3
5
200
5
60
mV
mV
mV
MHz
kHz
MHz
%
A
mV
μA
μA
V SHDN = 0V
0.1
1
μA
SHDN Pin Threshold
0.3
1.5
2
V
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 LT3477E is guaranteed to meet performance speci?cations
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LT3477I is guaranteed
over the full –40°C to 125°C operating junction temperature range.
Note 3: Switch current limit and switch V CESAT for UF package guaranteed
by design and/or correlation to static test.
from 0°C to 70°C. Speci?cations over the – 40°C to 85°C operating
TYPICAL PERFORMANCE CHARACTERISTICS
0.50
0.45
0.40
0.35
Switch V CE(SAT)
125°C
5
4
Switch Current Limit
1.27
1.26
1.25
V REF
0.30
0.25
25°C
3
1.24
V IN = 25V
0.20
2
0.15
0.10
–50°C
1
1.23
1.22
V IN = 2.5V
0.05
0
0
0.5
1
1.5 2
2.5
3
0
–50
–25
0
25
50
75
100
125
1.21
–50 –25
0
25
50
75
100 125 150
SWITCH CURRENT (A)
3477 G01
TEMPERATURE (°C)
3477 G02
TEMPERATURE (°C)
3477 G03
3477fc
3
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