LT3477 LINER [Linear Technology], LT3477 Datasheet - Page 3

• Manufacturer Part Number: LT3477
• Description: 3A, DC/DC Converter with Dual Rail-to-Rail Current Sense
• Manufacturer: LINER [Linear Technology]

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