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Linear Technology Electronic Components Datasheet

LT3599 Datasheet

4-String 120mA LED Driver

No Preview Available !

LT3599
4-String 120mA LED Driver
with ±1.5% Current Matching
Features
Description
nn True Color PWMTM Dimming Ratio Up to 3000:1
nn Drives Four Strings of LEDs at Up to 120mA
nn ±1.5% Accurate LED Current Matching
nn Wide Input Voltage Range: 3.1V to 30V
nn Output Voltage Up to 44V
nn Regulates LED Current Even When VIN > VOUT
nn Disconnects LEDs in Shutdown
nn Programmable Maximum VOUT (Regulated)
nn Open/Short LED Protection and Fault Flags
nn Programmable LED Current Derating
nn Adjustable Frequency: 200kHz to 2.1MHz
nn Synchronizable to an External Clock
nn Analog Dimming Up to 20:1
nn Programmable Input UVLO with Hysteresis
nn Thermally Enhanced 32-Pin (5mm × 5mm) QFN and
28-Pin TSSOP Packages
Applications
nn Automotive Navigation TFT LCD Displays
nn Desktop and Notebook TFT LCD Displays
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, SHORTLED 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, LTC, LTM, 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.
Typical Application
PVIN
8V TO 24V
200k
3.3µF
VIN
VIN
3.1V TO 5.5V
VIN
1µF
100k
100k
31.6k
PWM
33.2k
53.6k 53.6k
80.6k
90% Efficient 12W LED Driver
10µH
VIN SW
SHORTLED
OPENLED
SHDN/UVLO
PWM
SYNC
CTRL
LT3599
RT
VREF
VOUT
VO_SW
FB
1M
31.6k
TSET
DISABLE4
ISET SS
LED1
LED2
LED3
LED4
GND VC
80mA PER STRING
16.5k
47nF
10k
2.2nF
100pF
4.7µF
×2
3599 TA01a
For more information www.linear.com/LT3599
LED Current Matching
1.5 ALL FOUR LED STRINGS
1.0
0.5
0
–0.5
–1.0
–1.5
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3599 TA01b
3599ff
1


Linear Technology Electronic Components Datasheet

LT3599 Datasheet

4-String 120mA LED Driver

No Preview Available !

LT3599
Absolute Maximum Ratings (Note 1)
VIN, SHDN/UVLO, OPENLED, SHORTLED...................30V
SHDN/UVLO Pin Above VIN..........................................3V
SW.............................................................................45V
VOUT, VO_SW...............................................................45V
LED1, LED2, LED3, LED4...........................................45V
PWM, SYNC, CTRL, FB, TSET, DISABLE4.....................6V
VC, SS..........................................................................3V
VREF, RT, ISET...............................................................2V
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
Pin Configuration
TOP VIEW
SW 1
28 VIN
VOUT
VO_SW
LED1
2
3
4
27 SHDN/UVLO
26 NC
25 GND
LED2 5
24 VREF
LED3 6
23 SS
LED4 7 29 22 RT
DISABLE4 8
21 PWM
SHORTLED 9
20 NC
NC 10
19 SYNC
OPENLED 11
18 NC
NC 12
17 TSET
ISET 13
CTRL 14
16 FB
15 VC
FE PACKAGE
28-LEAD PLASTIC TSSOP
TJMAX = 150°C, θJA = 28°C/W , θJC = 10°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
32 31 30 29 28 27 26 25
VOUT
VO_SW
LED1
1
2
3
24 NC
23 NC
22 GND
LED2 4
LED3 5
33 21 VREF
20 SS
LED4 6
19 RT
DISABLE4 7
SHORTLED 8
18 PWM
17 SYNC
9 10 11 12 13 14 15 16
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 34°C/W
EXPOSED PAD (PIN 33) IS GND, MUST BE SOLDERED TO PCB
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.
3599ff
2 For more information www.linear.com/LT3599


Part Number LT3599
Description 4-String 120mA LED Driver
Maker Linear Technology
PDF Download

LT3599 Datasheet PDF






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