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LT3599IFE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
LT3599
1
3599ff
For more information www.linear.com/LT3599
Typical applicaTion
FeaTures
applicaTions
DescripTion
4-String 120mA LED Driver
with ±1.5% Current Matching
The LT
®
3599 is a fixed frequency 2A step-up DC/DC
converter designed to drive four strings of 120mA LEDs
up to a 44V output voltage. The switching frequency is
programmable from 200kHz to 2.1MHz through an ex
-
ternal resistor.
LED dimming can be achieved with analog dimming on
the CTRL pin,
and with pulse width modulation dimming
on the PWM pin. The LT3599 accurately regulates LED
current even when the input voltage is higher than the
LED output voltage.
Additional features include programmable LED current
derating, switching frequency synchronization to an ex
-
ternal clock, LED string disable control, OPENLED alert
pin
, SHOR
TLED alert pins and programmable maximum
output voltage when all LED strings are disconnected. The
LT3599 is available in the thermally enhanced 32-pin (5mm
× 5mm) QFN and 28-pin TSSOP packages.
L, LT , LT C , LT M , Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. True Color PWM is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents,
including 7199560.
90% Efficient 12W LED Driver
n
True Color PWM
TM
Dimming Ratio Up to 3000:1
n
Drives Four Strings of LEDs at Up to 120mA
n
±1.5% Accurate LED Current Matching
n
Wide Input Voltage Range: 3.1V to 30V
n
Output Voltage Up to 44V
n
Regulates LED Current Even When V
IN
> V
OUT
n
Disconnects LEDs in Shutdown
n
Programmable Maximum V
OUT
(Regulated)
n
Open/Short LED Protection and Fault Flags
n
Programmable LED Current Derating
n
Adjustable Frequency: 200kHz to 2.1MHz
n
Synchronizable to an External Clock
n
Analog Dimming Up to 20:1
n
Programmable Input UVLO with Hysteresis
n
Thermally Enhanced 32-Pin (5mm × 5mm) QFN and
28-Pin TSSOP Packages
n
Automotive Navigation TFT LCD Displays
n
Desktop and Notebook TFT LCD Displays
LED Current Matching
10k
3.3µF
47nF
10µH
4.7µF
×2
100pF
2.2nF
3599 TA01a
LT3599
V
O_SW
FB
OPENLED
SHORTLED
PWM
SHDN/UVLO
RT
SYNC
PWM
80mA PER STRING
CTRL
V
REF
T
SET
LED1
LED2
LED3
LED4
V
OUT
SWV
IN
V
C
SS GND
I
SET
1M
31.6k
PV
IN
8V TO 24V
V
IN
V
IN
16.5k
53.6k
100k
DISABLE4
100k
31.6k
33.2k
53.6k
80.6k
200k
1µF
V
IN
3.1V TO 5.5V
TEMPERATURE (°C)
–50
–1.5
MATCHING (%)
–1.0
0
0.5
1.0
1.5
0
50
75
–0.5
–25
25
100
150125
3599 TA01b
ALL FOUR LED STRINGS
LT3599
2
3599ff
For more information www.linear.com/LT3599
pin conFiguraTion
absoluTe MaxiMuM raTings
V
IN
, SHDN/UVLO, OPENLED, SHORTLED ..................30V
SHDN/UVLO Pin Above V
IN
.........................................3V
SW ............................................................................45V
V
OUT
, V
O_SW
.............................................................. 45V
LED1, LED2, LED3, LED4 ..........................................45V
PWM, SYNC, CTRL, FB, T
SET
, DISABLE4 ....................6V
V
C
, SS .........................................................................3V
V
REF
, RT, I
SET
.............................................................. 2V
(Note 1)
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3599EFE#PBF LT3599EFE#TRPBF LT3599FE 28-Lead Plastic TSSOP –40°C to 125°C
LT3599IFE#PBF LT3599IFE#TRPBF LT3599FE 28-Lead Plastic TSSOP –40°C to 125°C
LT3599HFE#PBF LT3599HFE#TRPBF LT3599FE 28-Lead Plastic TSSOP –40°C to 150°C
LT3599EUH#PBF LT3599EUH#TRPBF 3599 32-Lead (5mm × 5mm) Plastic QFN –40°C to 125°C
LT3599IUH#PBF LT3599IUH#TRPBF 3599 32-Lead (5mm × 5mm) Plastic QFN –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/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
Operating Junction Temperature Range (Note 2)
LT3599E/LT3599I .............................. –40°C to 125°C
LT3599H ............................................ –40°C to 150°C
Maximum Junction Temperature
LT3599E/LT3599I ............................................. 125°C
LT3599H ........................................................... 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, sec) (Note 5) ......... 300°C
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
FE PACKAGE
28-LEAD PLASTIC TSSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
SW
V
OUT
V
O_SW
LED1
LED2
LED3
LED4
DISABLE4
SHORTLED
NC
OPENLED
NC
I
SET
CTRL
V
IN
SHDN
/UVLO
NC
GND
V
REF
SS
RT
PWM
NC
SYNC
NC
T
SET
FB
V
C
29
T
JMAX
= 150°C, θ
JA
= 28°C/W , θ
JC
= 10°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
32
33
31 30 29 28 27 26 25
9 10 11 12
TOP VIEW
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
13 14 15 16
17
18
19
20
21
22
23
24
8
7
6
5
4
3
2
1V
OUT
V
O_SW
LED1
LED2
LED3
LED4
DISABLE4
SHORTLED
NC
NC
GND
V
REF
SS
RT
PWM
SYNC
NC
NC
NC
SW
VIN
SHDN/UVLO
NC
NC
NC
NC
OPENLED
I
SET
CTRL
V
C
FB
T
SET
T
JMAX
= 125°C, θ
JA
= 34°C/W
EXPOSED PAD (PIN 33) IS GND, MUST BE SOLDERED TO PCB
LT3599
3
3599ff
For more information www.linear.com/LT3599
elecTrical characTerisTics
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 CONDITIONS MIN TYP MAX UNITS
Minimum Operating Voltage
l
2.7 3.1 V
Maximum Operating Voltage
l
30 V
Reference Voltage V
REF
I(V
REF
) = 0µA
l
1.21
1.20
1.227 1.24
1.25
V
V
Reference Voltage Line Regulation I(V
REF
) = 0µA, 3.1V < V
IN
< 30V 0.01 0.03 %/V
Maximum V
REF
Pin Current (Note 3) 100 µA
V
REF
Load Regulation 0 < I(V
REF
) ≤ 100µA (Max) 1 mV
Feedback Voltage
l
1.196 1.223 1.250 V
FB Pin Bias Current (Note 3) 100 250 nA
FB Error Amp Transconductance ∆I = 5µA 200 µmhos
FB Error Amp Voltage Gain 210 V/V
Current Loop Amp Transconductance 50 µmhos
Current Loop Amp Voltage Gain 50 V/V
V
C
Source Current (Out of Pin) LED1-4 = 0.4V, FB = 1V, V
C
= 1.5V 8 µA
V
C
Sink Current (OVP Mode) LED1-4 = 0.4V, FB = 1.5V, V
C
= 1.5V 15 µA
Quiescent Current V
SHDN
= 5V, PWM = 0V, Not Switching, V
C
= 0.7V 3 4.8 mA
Quiescent Current in Shutdown V
SHDN
= 0V 0 1 µA
LED Current R
ISET
= 13.3k 96 99 102 mA
LED String Current Matching 100mA LED Current
l
±0.25 ±1.5 %
LED Open Detection Threshold (V
LED
–GND) FB > 1.25V 0.3 0.4 V
LED Short Detection Threshold (V
OUT
–V
LED
) 0.8 1.5 2.2 V
LED Regulation Voltage 0.77 V
LED1-4 Leakage Current V
LED1-4
= 45V 0.1 1 µA
CTRL Pin Bias Current V
CTRL
= 0.8V (Note 3) 100 200 nA
Switching Frequency R
T
= 324k
R
T
= 53.6k
R
T
= 20k
176
0.9
1.82
198
1
2.06
220
1.1
2.3
kHz
MHz
MHz
T
SET
Voltage 595 mV
Maximum Switch Duty Cycle R
T
= 324k
R
T
= 53.6k
R
T
= 20k
l
l
l
97.7
88.5
77
98.6
93
86
%
%
%
Switch Current Limit (Note 4) 2
2.5 3 A
Switch V
CESAT
I
SW
= 0.5A 0.10 V
Switch Leakage Current V
SW
= 45V, FB = 1.3V 0.2 5 µA
SHDN/UVLO Pin Threshold (V
SD_SHDN
) Shutdown 0.3 0.7 0.95 V
SHDN/UVLO Pin Threshold (V
SD_ UVLO
) Rising 1.28 1.36 1.44 V
SHDN/UVLO Pin Hysteresis Current SHDN = V
SD_UVLO
– 50mV
SHDN = V
SD_UVLO
+ 50mV
2.5 4
0
5.5 µA
µA
Soft-Start Current SS = 1V (Note 3) 11 µA
PWM Input High Threshold 1 V
PWM Input Low Threshold 0.4 V
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LT3599IFE#PBF

Mfr. #:
Buy LT3599IFE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LED Lighting Drivers 45V, 2.1MHz, 4 Channel 120mA Boost Mode LED Driver
Lifecycle:
New from this manufacturer.
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