LT3474EFE#PBF Linear Technology, LT3474EFE#PBF Datasheet - Page 3

• Manufacturer Part Number: LT3474EFE#PBF
• Description: IC LED DRVR HP CONS CURR 16TSSOP
• Manufacturer: Linear Technology
• Type: High Power, Constant Currentr

Specifications of LT3474EFE#PBF

• Constant Current: Yes
• Topology: PWM, Step-Down (Buck)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Automotive, Backlight
• Type - Secondary: Color, White LED
• Frequency: 200kHz ~ 2MHz
• Voltage - Supply: 3.5 V ~ 36 V
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP Exposed Pad, 16-eTSSOP, 16-HTSSOP
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 1A
• Internal Switch(s): Yes
• No. Of Outputs: 1
• Output Current: 1A
• Output Voltage: 15V
• Input Voltage: 4V To 36V
• Dimming Control Type: PWM
• Operating Temperature Range: -40°C To +85°C
• Driver Case Style: TSSOP
• Rohs Compliant: Yes
• Led Driver Application: Automotive, Avionic Lighting
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Efficiency: -

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
PARAMETER
Reference Voltage Line Regulation
Reference Voltage Load Regulation
V
Switching Frequency
Maximum Duty Cycle
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 (LT3474)
OUT Pin Current in PWM Mode
Switch Current Limit (Note 6)
Switch V
Boost Pin Current
Switch Leakage Current
Minimum Boost Voltage (Note 7)
Boost Diode Forward Voltage
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.
Note 3: The LT3474E and LT3474E-1 are guaranteed to meet performance
specifi cations from 0°C to 70°C. Specifi cations over the –40°C to 85°C
ADJ
C
C
C
C
C
C
Sink Current
to Switch Current Gain
Switching Threshold
Source Current
Clamp Voltage
Pin Current in PWM Mode
Pin Bias Current (Note 4)
C
C
CESAT
Current Gain
Transresistance
CONDITIONS
5V < V
0 < I
R
R
R
R
R
V
V
V
V
V
–40°C to 85°C
LT3474I, LT3474I-1 at 125°C
I
I
I
SW
SW
DIO
SHDN
C
C
C
OUT
T
T
T
T
T
= 1V, V
= 80.6k
= 80.6k
= 10k
= 232k
= 80.6k, V
= 1V
= 1V
= 1A
= 1A
= 100mA
REF
= 4V, V
IN
= SHDN Threshold
< 250μA
< 36V
PWM
A
= 25°C. V
PWM
OUT
= 0.3V
The
= 0V
= 0.3V
l
IN
denotes the specifi cations which apply over the full operating
= 12V, V
operating temperature range are assured by design, characterization and
correlation with statistical process controls. The LT3474I and LT3474I-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.
Note 7: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the internal power switch.
BOOST
= 16V, V
OUT
l
l
l
l
l
l
= 4V unless otherwise noted (Note 3).
LT3474/LT3474-1
MIN
13.2
470
450
2.6
8.3
0.4
1.6
1.5
90
0.0002
0.01
2.65
10.3
0.01
13.8
0.01
TYP
500
100
100
380
600
0.9
0.8
1.5
1.9
0.1
2.1
1.9
30
20
95
76
98
70
1
2
MAX
12.3
14.5
400
530
540
500
2.7
1.2
3.2
3.2
2.5
50
10
1
1
μA/mA
UNITS
%/μA
V/mA
3474fd
3
%/V
kHz
kHz
kHz
A/V
mV
mA
mV
μA
μA
nA
μA
μA
μA
μA
%
%
%
V
V
V
V
V
A
A
V