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LT3491
ABSOLUTE
AXI U
RATI GS (Note 1)
Input Voltage (V IN ) .................................................
SW Voltage .............................................................
CAP Voltage ............................................................
CTRL Voltage ..........................................................
12V
32V
32V
12V
LED Voltage ............................................................ 32V
Operating Temperature Range (Note 2) .. – 40 ° C to 85 ° C
Maximum Junction Temperature ......................... 125 ° C
Storage Temperature Range ................ – 65 ° C to 150 ° C
Lead Temperature (Soldering, 10sec, SC-70) ......... 300 ° C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
TOP VIEW
V IN 1
6 CTRL
SW 1
8 CAP
GND 2
SW 3
7
5 LED
4 CAP
GND 2
GND 3
7 LED
6 CTRL
GND 4
5 V IN
DC PACKAGE
6-LEAD (2mm × 2mm) PLASTIC DFN
T JMAX = 125 ° C, θ JA = 102 ° C/W, θ JC = 20 ° C/ W
EXPOSED PAD (PIN 7) SHOULD BE CONNECTED TO PCB GROUND
SC8 PACKAGE
8-LEAD PLASTIC SC70
T JMAX = 125 ° C, θ JA = 270 ° C/ W
ORDER PART NUMBER
LT3491EDC
DC PART MARKING
LCHJ
ORDER PART NUMBER
LT3491ESC8
DC PART MARKING
LBXQ
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T A = 25 ° C.
V IN = 3V, V CTRL = 3V, unless otherwise specified.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum Operating Voltage
2.5
V
LED Current Sense Voltage (V CAP – V LED )
CAP, LED Pin Bias Current
V CAP = 30V
V CAP = 16V, V LED = 16V
●
190
200
20
210
40
mV
μ A
V CAP , V LED Common Mode Minimum Voltage
2.5
V
Supply Current
Switching Frequency
V CAP = 16V, V LED = 15V, CTRL = 3V
CTRL = 0V
1.8
2.6
8
2.3
4
10
2.8
mA
μ A
MHz
Maximum Duty Cycle
Switch Current Limit
Switch V CESAT
I SW = 200mA
●
●
88
260
92
350
200
%
mA
mV
Switch Leakage Current
V SW = 16V
0.1
5
μ A
V CTRL for Full LED Current
V CTRL to Shut Down IC
V CTRL to Turn On IC
CTRL Pin Bias Current
V CAP = 30V
●
●
1.5
100
100
50
V
mV
mV
nA
CAP Pin Overvoltage Protection
●
26
27
28
V
Schottky Forward Drop
Schottky Leakage Current
I SCHOTTKY = 100mA
V R = 20V
0.8
4
V
μ A
3491fa
2
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