LT3599
4-String 120mA LED Driver
with 1.5% Current Matching
Fea T Descrip T
TM
n
True Color PWM Dimming Ratio Up to 3000:1 The LT 3599 is a fixed frequency 2A step-up DC/DC
n
Drives Four Strings of LEDs at Up to 120mA converter designed to drive four strings of 120mA LEDs
n
1.5% Accurate LED Current Matching up to a 44V output voltage. The switching frequency is
n
Wide Input Voltage Range: 3.1V to 30V programmable from 200kHz to 2.1MHz through an ex-
n
Output Voltage Up to 44V ternal resistor.
n
Regulates LED Current Even When V > V
IN OUT
LED dimming can be achieved with analog dimming on
n
Disconnects LEDs in Shutdown
the CTRL pin, and with pulse width modulation dimming
n
Programmable Maximum V (Regulated)
OUT
on the PWM pin. The LT3599 accurately regulates LED
n
Open/Short LED Protection and Fault Flags
current even when the input voltage is higher than the
n
Programmable LED Current Derating
LED output voltage.
n
Adjustable Frequency: 200kHz to 2.1MHz
n Additional features include programmable LED current
Synchronizable to an External Clock
n derating, switching frequency synchronization to an ex-
Analog Dimming Up to 20:1
n ternal clock, LED string disable control, OPENLED alert
Programmable Input UVLO with Hysteresis
n pin, SHORTLED alert pins and programmable maximum
Thermally Enhanced 32-Pin (5mm 5mm) QFN and
output voltage when all LED strings are disconnected. The
28-Pin TSSOP Packages
LT3599 is available in the thermally enhanced 32-pin (5mm
5mm) QFN and 28-pin TSSOP packages.
a T
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
n Technology Corporation. True Color PWM is a trademark of Linear Technology Corporation.
Automotive Navigation TFT LCD Displays
All other trademarks are the property of their respective owners. Protected by U.S. Patents,
n
Desktop and Notebook TFT LCD Displays including 7199560.
Typical a T
90% Efficient 12W LED Driver
PV
IN
10H
8V TO 24V
4.7F
V
IN
3.3F
2
3.1V TO 5.5V LED Current Matching
V
IN
V SW V
IN OUT
V 1.5
IN 1F
V
O_SW
ALL FOUR LED STRINGS
100k
1M
100k
SHORTLED
1.0
200k
OPENLED FB
SHDN/UVLO
31.6k
0.5
PWM PWM
31.6k
SYNC
LT3599
CTRL
0
RT
33.2k
V
REF
53.6k
0.5
53.6k
T
SET
1.0
LED1
80.6k
LED2
LED3
3599 TA01a 1.5
LED4
50 25 0 25 50 75 100 125 150
DISABLE4
80mA PER STRING
TEMPERATURE (C)
I SS GND V
SET C
3599 TA01b
47nF
16.5k 100pF
10k
2.2nF
3599ff
1
For more information www.linear.com/LT3599
MATCHING (%)
ion pplica
ions pplica
ion uresLT3599
a Te Maxi Mu M r a T (Note 1)
V , SHDN/UVLO, OPENLED, SHORTLED ..................30V Operating Junction Temperature Range (Note 2)
IN
SHDN/UVLO Pin Above V .........................................3V LT3599E/LT3599I .............................. 40C to 125C
IN
SW ............................................................................45V LT3599H ............................................ 40C to 150C
V , V ..............................................................45V Maximum Junction Temperature
OUT O_SW
LED1, LED2, LED3, LED4 ..........................................45V LT3599E/LT3599I ............................................. 125C
PWM, SYNC, CTRL, FB, T , DISABLE4 ....................6V LT3599H ........................................................... 150C
SET
V , SS .........................................................................3V Storage Temperature Range .................. 65C to 150C
C
V , RT, I ..............................................................2V Lead Temperature (Soldering, sec) (Note 5) .........300C
REF SET
p in c F T
TOP VIEW TOP VIEW
1 28 V
SW
IN
2 27 SHDN/UVLO
V
OUT
3 26 NC
V
O_SW
32 31 30 29 28 27 26 25
4 25 GND
LED1
V 1 24 NC
OUT
5 24 V
LED2
REF
V 2 23 NC
O_SW
6 23 SS
LED3
LED1 3 22 GND
29
7 22 RT
LED4 LED2 4 21 V
REF
33
8 21 PWM LED3 5 20 SS
DISABLE4
LED4 RT
9 20 NC 6 19
SHORTLED
DISABLE4 7 18 PWM
10 19 SYNC
NC
SHORTLED 8 17 SYNC
11 18 NC
OPENLED
9 10 11 12 13 14 15 16
12 17 T
NC
SET
13 16 FB
I
SET
14 15 V
CTRL
C
FE PACKAGE UH PACKAGE
28-LEAD PLASTIC TSSOP 32-LEAD (5mm 5mm) PLASTIC QFN
T = 150C, = 28C/W , = 10C/W
T = 125C, = 34C/W
JMAX JA JC JMAX JA
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
EXPOSED PAD (PIN 33) IS GND, MUST BE SOLDERED TO PCB
o r Der i n F Ma T
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3599EFE#PBF LT3599EFE#TRPBF LT3599FE 28-Lead Plastic TSSOP 40C to 125C
LT3599IFE#PBF LT3599IFE#TRPBF LT3599FE 28-Lead Plastic TSSOP 40C to 125C
LT3599HFE#PBF LT3599HFE#TRPBF LT3599FE 28-Lead Plastic TSSOP 40C to 150C
LT3599EUH#PBF LT3599EUH#TRPBF 3599 32-Lead (5mm 5mm) Plastic QFN 40C to 125C
LT3599IUH#PBF LT3599IUH#TRPBF 3599 32-Lead (5mm 5mm) Plastic QFN 40C to 125C
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: