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LT3591
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Voltage (V IN ) ................................................... 12V
PACKAGE/ORDER INFORMATION
TOP VIEW
CTRL Voltage ........................................................... 12V
SW Voltage .............................................................. 45V
CAP Voltage ............................................................. 45V
LED Voltage ............................................................. 45V
V IN 1
GND 2
NC 3
SW 4
9
8 CTRL
7 LED
6 NC
5 CAP
Operating Junction Temperature Range
(Note 2) ............................................... –40°C to 85°C
Maximum Junction Temperature ........................ 125°C
Storage Temperature Range................... –65°C to 150°C
DDB PACKAGE
8-LEAD (3mm × 2mm) PLASTIC DFN
T JMAX = 125°C, θ JA = 76°C/W
EXPOSED PAD (PIN 9) SHOULD BE CONNECTED TO PCB GROUND
ORDER PART NUMBER
LT3591EDDB
DDB PART MARKING
LCPG
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 speci?ed with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● denotes the speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T A = 25°C. V IN = 3V, V CTRL = 3V, unless otherwise speci?ed.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum Operating Voltage
2.5
V
LED Current Sense Voltage (V CAP – V LED )
CAP Pin Bias Current
LED Pin Bias Current
Supply Current
V CAP = 24V, I SW = 300mA
V CAP = 36V, V LED = 35.8V
V CAP = 36V, V LED = 35.8V
V CAP = 24V, V LED = 23V
●
190
200
40
20
4
210
80
40
5
mV
μA
μA
mA
CTRL = 0V
9
11
μA
Switching Frequency
Maximum Duty Cycle
0.75
92
1
94
1.2
MHz
%
Switch Current Limit
Switch V CESAT
I SW = 300mA
●
500
800
200
mA
mV
Switch Leakage Current
V SW = 24V
0.1
5
μA
V CTRL for Full LED Current
V CTRL to Shut Down IC
V CTRL to Turn On IC
CTRL Pin Bias Current
V CAP = 44V
●
●
1.5
100
100
50
V
mV
mV
nA
CAP Pin Overvoltage Protection
●
40
42
44
V
Schottky Forward Drop
Schottky Leakage Current
I SCHOTTKY = 200mA
V R = 30V
0.8
4
V
μA
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 LT3591E is guaranteed to meet performance speci?cations
from 0°C to 85°C operating junction temperature range. Speci?cations
over the –40°C to 85°C operating junction temperature range are assured
by design, characterization and correlation with statistical process controls.
3591f
2
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