Operating Junction Temperature Range ...–40°C to 125°C
Maximum Junction Temperature........................... 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, sec) (Note 5) ......... 300°C
PIN CONFIGURATION
SW
V
OUT
V
O_SW
LED1
LED2
LED3
LED4
DISABLE4
SHORTLED
1
2
3
4
5
6
7
8
9
29
28 V
IN
VIN
SW
NC
NC
NC
27
SHDN/UVLO
26 NC
25 GND
24 V
REF
23 SS
22 R
T
21 PWM
20 NC
19 SYNC
18 NC
17 T
SET
16 FB
15 V
C
V
OUT
1
V
O_SW
2
LED1 3
LED2 4
LED3 5
LED4 6
DISABLE4 7
SHORTLED
8
9 10 11 12 13 14 15 16
NC
NC
OPENLED
I
SET
CTRL
V
C
FB
T
SET
33
SHDN/UVLO
TOP VIEW
TOP VIEW
NC
32 31 30 29 28 27 26 25
24 NC
23 NC
22 GND
21 V
REF
20 SS
19 R
T
18 PWM
17 SYNC
NC 10
OPENLED
11
NC 12
I
SET
13
CTRL 14
FE PACKAGE
28-LEAD PLASTIC TSSOP
T
JMAX
= 125°C,
θ
JA
= 28°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
UH PACKAGE
32-LEAD (5mm 5mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 34°C/W
EXPOSED PAD (PIN 33) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT3599EFE#PBF
LT3599IFE#PBF
LT3599EUH#PBF
LT3599IUH#PBF
TAPE AND REEL
LT3599EFE#TRPBF
LT3599IFE#TRPBF
LT3599EUH#TRPBF
LT3599IUH#TRPBF
PART MARKING*
LT3599FE
LT3599FE
3599
3599
PACKAGE DESCRIPTION
28-Lead (4mm
×
4mm) Plastic FE
28-Lead (4mm
×
4mm) Plastic FE
32-Lead (5mm
×
5mm) Plastic QFN
32-Lead (5mm
×
5mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
NC
3599f
2
LT3599
ELECTRICAL CHARACTERISTICS
PARAMETER
Minimum Operating Voltage
Maximum Operating Voltage
Reference Voltage V
REF
Reference Voltage Line Regulation
Maximum V
REF
Pin Current
V
REF
Load Regulation
Feedback Voltage
FB Pin Bias Current
FB Error Amp Transconductance
FB Error Amp Voltage Gain
Current Loop Amp Transconductance
Current Loop Amp Voltage Gain
V
C
Source Current (Out of Pin)
V
C
Sink Current (OVP Mode)
Quiescent Current
Quiescent Current in Shutdown
LED Current
LED String Current Matching
LED Open Detection Threshold (V
LED
–GND)
LED Short Detection Threshold (V
OUT
–V
LED
)
LED Regulation Voltage
LED1-4 Leakage Current
CTRL Pin Bias Current
Switching Frequency
V
LED1-4
= 45V
V
CTRL
= 0.8V (Note 3)
R
T
= 324k
R
T
= 53.6k
R
T
= 20k
R
T
= 324k
R
T
= 53.6k
R
T
= 20k
(Note 4)
I
SW
= 0.5A
V
SW
= 45V, FB = 1.3V
Shutdown
Rising
SHDN
= V
SD_UVLO
– 50mV
SHDN
= V
SD_UVLO
+ 50mV
SS = 1V (Note 3)
0.4
0.3
1.28
2.5
176
0.9
1.82
97
85
70
2
LED1-4 = 0.4V, FB = 1V, V
C
= 1.5V
LED1-4 = 0.4V, FB = 1.5V, V
C
= 1.5V
V
SHDN
= 5V, PWM = 0V, Not Switching, V
C
= 0.7V
V
SHDN
= 0V
R
ISET
= 13.3k
100mA LED Current
FB > 1.25V
0.8
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 5V, V
SHDN
= 5V, unless otherwise noted. (Note 2)
CONDITIONS
l
l
MIN
TYP
2.7
MAX
3.1
30
1.24
1.25
0.03
100
UNITS
V
V
V
V
%/V
μA
mV
V
nA
μmhos
V/V
μmhos
V/V
μA
μA
I(V
REF
) = 0μA
I(V
REF
) = 0μA, 3.1V < V
IN
< 30V, V
C
= 0.7V
(Note 3)
0 < I(V
REF
) ≤ 100μA (Max)
l
1.21
1.20
1.227
0.01
1
l
1.196
1.223
100
200
210
50
50
8
15
3
0
1.250
250
(Note 3)
ΔI
= 5μA
4.8
1
102
±1.5
0.4
2.2
1
200
220
1.1
2.3
mA
μA
mA
%
V
V
V
μA
nA
kHz
MHz
MHz
mV
%
%
%
96
99
±0.25
0.3
1.5
0.77
0.1
100
198
1
2.06
575
98
90
80
2.5
0.10
0.2
0.7
1.36
4
0
11
T
SET
Voltage
Maximum Switch Duty Cycle
l
Switch Current Limit
Switch V
CESAT
Switch Leakage Current
SHDN/UVLO
Pin Threshold (V
SD_SHDN
)
SHDN/UVLO
Pin Threshold (V
SD_ UVLO
)
SHDN/UVLO
Pin Hysteresis Current
Soft-Start Current
PWM Input High Threshold
PWM Input Low Threshold
3
5
0.95
1.44
5.5
A
V
μA
V
V
μA
μA
μA
V
V
3599f
1
3
LT3599
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 5V, V
SHDN
= 5V, unless otherwise noted. (Note 2)
PARAMETER
PWM Pin Bias Current
SYNC Input High Threshold
SYNC Input Low Threshold
SYNC Pin Bias Current
V
O_SW
Switch Resistance
OPENLED
Pull-Down Current
SHORTLED
Pull-Down Current
DISABLE4 Input High Threshold
DISABLE4 Input Low 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 LT3599 is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3599I is guaranteed over the full –40°C to 125°C operating junction
temperature range.
0.4
PWM = 5V; LEDx < 0.2V,
OPENLED
= 0.3V
PWM = 5V; LEDx > (V
OUT
– 1.5V),
SHORTLED
= 0.3V
1
1
1.15
SYNC = 0V (Note 3)
SYNC = 3.3V
0.8
25
0.1
50
1
1000
CONDITIONS
PWM = 3.3V
MIN
TYP
0.1
MAX
2
1.7
UNITS
μA
V
V
μA
μA
Ω
mA
mA
V
V
ELECTRICAL CHARACTERISTICS
Note 3:
Current flows out of pin.
Note 4:
Current limit guaranteed by design and/or correlation to static test.
Current limit is independent of duty cycle and is guaranteed by design.
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