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LT3598EUF#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LT3598
1
3598fb
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
6-String 30mA LED Driver
with ±1.5% Current Matching
The LT
®
3598 is a fi xed frequency step-up DC/DC converter
designed to drive up to six strings of LEDs at an output
voltage up to 44V. LED dimming can be achieved with
analog dimming on the CTRL pin, and with pulse width
modulation dimming on the PWM pin. The LT3598
accurately regulates LED current even when the input
voltage is higher than the LED output voltage. The switching
frequency is programmable from 200kHz to 2.5MHz
through an external resistor.
Additional features include programmable overvoltage
protection, switching frequency synchronization to an
external clock, LED current derating based on junction
temperature and/or LED temperature, LED string disable
control, OPENLED alert pin and output voltage limiting
when all LED strings are disconnected. The LT3598 is
available in a thermally enhanced 24-lead (4mm × 4mm)
QFN and 24-lead TSSOP packages.
90% Effi cient LED Driver for 60 White LEDs
n
True Color PWM™ Dimming Delivers Up to 3000:1
Dimming Ratio
n
Drives Six Strings of LEDs at Up to 30mA
n
±1.5% Accurate LED Current Matching
n
Wide Input Voltage Range: 3.2V to 30V
n
Output Voltage Up to 44V
n
Regulates Current Even When V
IN
> V
OUT
n
Disconnects LEDs in Shutdown
n
Programmable Open LED Protection (Regulated)
n
OPENLED Alert Pin
n
Programmable LED Current Derating
n
Adjustable Frequency: 200kHz to 2.5MHz
n
Synchronizable to an External Clock
n
Parallel Channels for Higher Current per LED String
n
Thermally Enhanced 4mm × 4mm QFN and 24-Lead
TSSOP Packages
n
Notebook Computer Display
n
Medium Size Displays
n
Automotive LCD Display
LED Current Matching
2.61k
2.2μF
10μH
4.7μF
15nF
20mA
3598 TA01a
LT3598
V
O_SW
FB
OPENLED
PWM
SHDN
RT
SYNC
CTRL
V
REF
LED1
LED2
LED3
LED4
LED5
LED6
V
OUT
SW
V
IN
V
C
SS GND
T
SET
I
SET
1.00M
30.9k
PV
IN
8V TO 40V
2.2μF
V
IN
5V
14.7k
10nF
47pF
100k
100k
10k
51.1k
100k
60.4k
PWM
SHDN
SYNC
TEMPERATURE (°C)
–50
MATCHING (%)
0.5
1.0
0
–0.5
050
–25
25 75 100 125
–1.0
–1.5
1.5
3598 TA01b
ALL SIX LED STRINGS
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, 7321203.
LT3598
2
3598fb
PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
SHDN ................................................................V
IN
+ 3V
V
IN
, OPENLED ...........................................................30V
SW Voltage ...............................................................45V
V
OUT
, V
O_SW
Voltage .................................................44V
LED1 to LED6 ............................................................44V
PWM, SYNC, CTRL, RT, SS, V
C
................................... 6V
(Note 1)
1
2
3
4
5
6
7
8
9
10
11
12
TOP VIEW
FE PACKAGE
24-LEAD PLASTIC TSSOP
24
23
22
21
20
19
18
17
16
15
14
13
SW
V
OUT
V
O_SW
LED1
LED2
LED3
LED4
LED5
LED6
OPENLED
I
SET
CTRL
V
IN
SHDN
GND
V
REF
SS
RT
PWM
SYNC
NC
T
SET
FB
V
C
25
T
JMAX
= 125°C, θ
JA
= 38°C/W
EXPOSED PAD (PIN 25) IS PGND, MUST BE SOLDERED TO PCB
24 23 22 21 20 19
25
7 8 9
TOP VIEW
UF PACKAGE
24-LEAD (4mm s 4mm) PLASTIC QFN
10 11 12
6
5
4
3
2
1
13
14
15
16
17
18
LED1
LED2
LED3
LED4
LED5
LED6
V
REF
SS
RT
PWM
SYNC
NC
V
O_SW
V
OUT
SW
V
IN
SHDN
GND
OPENLED
I
SET
CTRL
V
C
FB
T
SET
T
JMAX
= 125°C, θ
JA
= 37°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3598EUF#PBF LT3598EUF#TRPBF 3598
24-Lead (4mm × 4mm) Plastic QFN
–40°C to 125°C
LT3598IUF#PBF LT3598IUF#TRPBF 3598
24-Lead (4mm × 4mm) Plastic QFN
–40°C to 125°C
LT3598EFE#PBF LT3598EFE#TRPBF LT3598 24-Lead Plastic TSSOP –40°C to 125°C
LT3598IFE#PBF LT3598IFE#TRPBF LT3598 24-Lead Plastic TSSOP –40°C to 125°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi
cations, go to: http://www.linear.com/tapeandreel/
V
REF
, FB Voltage..........................................................6V
I
SET
, T
SET
.....................................................................6V
Operating Junction Temperature Range
(Note 2) ..................................................–40°C to 125°C
Maximum Junction Temperature........................... 125°C
Storage Temperature Range ...................–65°C to 150°C
LT3598
3
3598fb
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 5V, V
SHDN
= V
IN
unless otherwise noted. (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Operating Voltage 3 3.2 V
Maximum Operating Voltage 30 V
Reference Voltage
l
1.216
1.210
1.230 1.260
1.260
V
V
Reference Voltage Line Regulation 3.2V < V
IN
< 30V, V
C
= 0.3V 0.01 0.03 %/V
Maximum V
REF
Pin Current Out of Pin 200 μA
FB Pin Bias Current V
FB
= 1.230V (Note 3) 100 250 nA
FB Error Amp Transconductance ΔI = 5μA 300 μmhos
FB Error Amp Voltage Gain 600 V/V
FB Pin Voltage 1.22 1.24 1.26 V
Current Loop Amp Transconductance 21 μmhos
Current Loop Amp Voltage Gain 80 V/V
V
C
Sink Current 10 μA
Quiescent Current V
SHDN
= 5V, PWM = 0V, Not Switching 3.5 5 mA
Quiescent Current in Shutdown V
SHDN
= 0V 0 1 μA
I
SET
Voltage V
CTRL
= 1.5V, V
TSET
= 1.5V, R
ISET
= 14.7kΩ 0.985 1.000 1.015 V
LED Current R
ISET
= 14.7kΩ 19.5 20 20.7 mA
LED String Current Matching 20mA LED Current
l
±0.5 ±1.5 %
LED Open Detection Threshold 0.2 0.25 V
OPENLED Sink Current 2mA
Minimum LED Regulation Voltage 0.8 V
LED1-6 Leakage Current V
LED1-6
= 1V, V
OUT
= 5V, PWM = 0V
V
LED1-6
= 42V, V
OUT
= 44V, PWM = 0V
0.1
0.2
1
2
μA
μA
CTRL Pin Bias Current V
CTRL
= 0.8V (Note 4) 50 125 nA
Switching Frequency RT = 309kΩ
RT = 51.1kΩ
RT = 14.7kΩ
171
0.9
2.25
190
1
2.5
209
1.1
2.75
kHz
MHz
MHz
T
SET
Voltage 602 mV
Maximum Switch Duty Cycle RT = 309kΩ
RT = 51.1kΩ
RT = 14.7kΩ
l
90
87
80
95
90
86
%
%
%
Switch Current Limit (Note 5) 1.5 2 2.5 A
Switch V
CESAT
I
SW
= 0.5A 0.12 V
Switch Leakage Current V
SW
= 40V 0.2 5 μA
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LT3598EUF#PBF

Mfr. #:
Buy LT3598EUF#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LED Lighting Drivers 6-String 30mA LED Driver with +/-1.5% Current Matching
Lifecycle:
New from this manufacturer.
Delivery:
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