LT3477EUF#TRPBF Linear Technology, LT3477EUF#TRPBF Datasheet - Page 3

• Manufacturer Part Number: LT3477EUF#TRPBF
• Description: IC LED DRVR HP CONST CURR 20-QFN
• Manufacturer: Linear Technology
• Type: High Power, Constant Currentr

Specifications of LT3477EUF#TRPBF

• Constant Current: Yes
• Constant Voltage: Yes
• Topology: Flyback, PWM, SEPIC, Step-Down (Buck), Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: General Purpose
• Type - Secondary: White LED
• Frequency: 200kHz ~ 3.5MHz
• Voltage - Supply: 2.5 V ~ 25 V
• Mounting Type: Surface Mount
• Package / Case: 20-QFN
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 3A
• Internal Switch(s): Yes
• Efficiency: 93%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
PARAMETER
Maximum V
Soft-Start Pin Current
FBP Pin Bias Current
FBN Pin Bias Current
Feedback Amplifi er Offset Voltage
Feedback Amplifi er Voltage Gain
Voltage Feedback Amplifi er Transconductance
Feedback Amplifi er Sink Current
Feedback Amplifi er Source Current
Current Sense Amplifi er 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 specifi cations
from 0°C to 70°C. Specifi cations over the – 40°C to 85°C operating
TYPICAL PERFORMANCE CHARACTERISTICS
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
Switch V
0
CESAT
REF
0.5
Pin Current
CE(SAT)
SWITCH CURRENT (A)
1
25°C
1.5
125°C
–50°C
2
2.5
3477 G01
3
CONDITIONS
Out of Pin
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)
= 1.25V, V
= 1.25V, V
= 5V
= 0V
3
0
5
4
2
1
A
–50 –25
Switch Current Limit
= 25°C. V
C
= 1V
CM
CM
The
FBN
FBN
= 25V, E Grade
= 25V, I Grade
= 1.5V, V
= 1V, V
●
0
TEMPERATURE (°C)
IN
indicates specifi cations which apply over the full operating
= 2.5V, V
25
C
= 0.5V
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.
= 1V
50
SHDN
75
= 2.5V.
100
3477 G02
125
1.27
1.26
1.25
1.24
1.22
1.21
1.23
●
●
●
–50
V
REF
MIN
97.5
97.5
160
0.9
2.7
0.3
–2
88
87
–25
3
CESAT
0
TEMPERATURE (°C)
for UF package guaranteed
TYP
500
500
100
100
100
200
150
3.5
0.2
0.1
1.5
25
25
93
30
25
10
10
9
2
1
4
V
V
IN
IN
50
= 25V
= 2.5V
LT3477
102.5
MAX
75
100
100
100
103
1.15
240
200
112
4.3
60
6
5
5
1
2
100
125
UNITS
3477fc
3
MHz
MHz
3477 G03
V/V
kHz
mV
mV
mV
mV
mV
μA
μA
nA
nA
μS
μA
μA
μA
μA
μA
150
%
A
V