lt3475efe-trpbf Linear Technology Corporation, lt3475efe-trpbf Datasheet - Page 3

• Manufacturer Part Number: lt3475efe-trpbf
• Description: Dual Step-down 1.5a Led Driver
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
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: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specifi ed maximum operating junction
temperature may impair device reliability.
PARAMETER
LED Pin Current
REF Voltage
Reference Voltage Line Regulation
Reference Voltage Load Regulation
V
Switching Frequency
Maximum Duty Cycle
Switching Phase
Foldback Frequency
SHDN Threshold (to Switch)
SHDN Pin Current (Note 5)
PWM Threshold
V
V
V
LED to V
LED to V
V
V
V
OUT Pin Clamp Voltage (LT3475)
OUT Pin Current in PWM Mode
Switch Current Limit (Note 6)
Switch V
BOOST Pin Current
Switch Leakage Current
Minimum Boost Voltage Above SW
ADJ
C
C
C
C
C
C
Source Current
Switching Threshold
Sink Current
to Switch Current Gain
Clamp Voltage
Pin Current in PWM Mode
Pin Bias Current (Note 4)
C
C
CESAT
Transresistance
Current Gain
CONDITIONS
V
V
LT3475E/LT3475E-1 0°C to 85°C
4V < V
0 < I
R
R
R
R
R
R
V
V
V
V
V
I
I
SW
SW
ADJ
ADJ
T
T
T
T
T
T
SHDN
C
C
C
OUT
= 24.3k
= 24.3k
= 4.32k
= 100k
= 24.3k
= 24.3k, V
= 1V
= 1V
= 1V, V
=1.5A
=1.5A
REF
Tied to V
Tied to V
A
= 4V, V
IN
= 2.6V
= 25°C. V
< 500μA
< 40V
PWM
PWM
The
OUT
REF
REF
= 0.3V
= 0V
= 0.3V
• 2/3
• 7/30
●
IN
denotes the specifi cations which apply over the full operating
= 12V, V
Note 3: The LT3475E and LT3475E-1 are guaranteed to meet performance
specifi cations from 0°C to 85°C. Specifi cations over the –40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls. The LT3475I and LT3475I-1
are guaranteed to meet performance specifi cations over the –40°C to
125°C operating temperature range.
Note 4: Current fl ows out of pin.
Note 5: Current fl ows into pin.
Note 6: Current limit is guaranteed by design and/or correlation to static
test. Slope compensation reduces current limit at higher duty cycles.
BOOST
= 16V, V
OUT
= 4V unless otherwise noted (Note 3)
●
●
●
●
●
●
●
●
LT3475/LT3475-1
0.336
0.325
0.97
0.94
0.31
1.22
13.5
MIN
530
150
2.5
0.3
2.3
90
7
0.0002
0.350
1.00
1.25
0.05
TYP
600
180
500
350
2.6
0.8
0.8
2.6
1.8
2.7
0.1
1.8
40
95
80
98
80
50
50
10
14
25
25
9
1
0.364
0.375
0.385
MAX
1.03
1.04
1.27
2.74
14.5
400
640
210
400
500
1.2
3.2
2.5
11
50
40
10
mA/μA
UNITS
%/μA
3475fb
3
%/V
Deg
kHz
kHz
V/A
A/V
mV
mA
nA
μA
μA
μA
nA
μA
μA
%
%
%
A
A
A
A
A
V
V
V
V
V
V
A
V