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LT3597IUHG#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LT3597
1
3597fa
Typical applicaTion
DescripTion
60V Triple Step-Down
LED Driver
The LT
®
3597 is a 60V triple step-down LED driver capable
of achieving 10,000:1 digital PWM dimming at 100Hz with
fast NPN current sources driving up to 10 LEDs in each
channel. LED dimming can also be achieved via analog
control of the CTRL1-3 pin.
The step-down switching frequency is programmed be-
tween 200kHz and 1MHz. The frequency is also synchroniz-
able to an external clock. The LT3597 provides maximum
LED brightness while adhering to manufacturers’ speci-
fications for thermal derating. The derate temperature is
programmed by placing a negative temperature coefficient
(NTC) resistor on the master control pin.
The LT3597 adaptively controls V
OUT
in order to achieve
optimal efficiency. Other features include: 2% LED cur-
rent matching between channels, open LED reporting,
shorted LED protection, programmable LED current, and
programmable temperature protection.
L, LT, LTC and LTM 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.
Triple Step-Down RGB Single Pixel LED Driver, 100mA Current
FeaTures
applicaTions
n
Three 100mA Buck Regulators, Each Drives Up to
10 LEDs with Fast NPN Current Sources
n
Fast Current Sources for <1µs Pulse Widths
(10,000:1 True Color PWM™ Dimming at 100Hz)
n
LEDs Disconnected in Shutdown
n
Adaptive V
OUT
for Increased Efficiency
n
6V to 60V Input Voltage Range
n
±2% LED Current Matching
n
External Resistor Sets LED Current for Each Channel
n
Internal Compensation and Soft-Start
n
Programmable Switching Frequency (200kHz to 1MHz)
n
Synchronizable to External Clock
n
Open LED Detection and Reporting
n
Shorted LED Pin Protection and Reporting
n
Programmable LED Thermal Derating
n
Programmable Temperature Protection
n
5mm × 8mm Thermally Enhanced QFN Package
with a 0.6mm High Voltage Pin Spacing
n
LED Billboards and Signboards
n
Mono, Multi, Full-Color LED Displays
n
Large Screen Display LED Backlighting
n
Automotive, Industrial, and Medical Displays
10,000:1 PWM Dimming at 100Hz
3597 TA01a
LT3597
V
IN
EN/UVLO
BOOST1
SW1
DA1
FB1
V
OUT1
LED1
BIAS
FAULT
PWM1-3
CTRL1-3
SYNC
RT
BOOST2
SW2
DA2
FB2
V
OUT2
LED2
BOOST3
SW3
DA3
FB3
V
OUT3
LED3
V
REF
T
SET
CTRLM
LT3597
9.1k
R
100k
97k
91k
270k
3.3µF
0.1µF
10µF
100µH
0.1µF
3.3µF
100µH
9.1k
97k
0.1µF
3.3µF
100µH
9.1k
97k
100k
10k
82.5k
V
REF
49.9k
10µF
V
CC
5V
V
OUT1
V
IN
48V
33.2k
(1MHz)
I
SET1
I
SET2
I
SET3
GND
20k 20k 20k
V
OUT2
V
OUT3
3
3
G
B
I
LED
50mA/DIV
PWM
2V/DIV
3597 TA01b
200ns/DIV
LT3597
2
3597fa
pin conFiguraTionabsoluTe MaxiMuM raTings
Input Voltage (V
IN
), EN/UVLO ...................................60V
BOOST1-3 .................................................................85V
BOOST Pin Above SW Pin ........................................ 25V
LED1-3, V
OUT1-3
........................................................ 42V
BIAS, FAULT ..............................................................25V
V
REF
, RT, I
SET1-3
, T
SET
, CTRLM ...................................3V
FB1-3, CTRL1-3, PWM1-3, SYNC ...............................6V
Operating Junction Temperature Range
(Notes 2, 3) ........................................–40°C to 125°C
Maximum Junction Temperature........................... 125°C
Storage Temperature Range ...................–65°C to 150°C
(Note 1)
18 19 20 21
TOP VIEW
53
GND
UHG PACKAGE
VARIATION: UHG52(39)
52-LEAD (5mm × 8mm) PLASTIC QFN
22 23 24 25 26
51 50 48 46 44
37
39
41
43
7
6
4
2
BST1
SW1
DA1
FB1
EN/UVLO
T
SET
V
REF
CTRLM
I
SET1
I
SET2
I
SET3
RT
DA3
SW3
BST3
BIAS
FB3
FB2
CTRL1
CTRL2
CTRL3
PWM1
PWM2
PWM3
SYNC
V
IN
V
IN
BST2
SW2
DA2
GND
V
OUT1
LED1
LED2
V
OUT2
V
OUT3
LED3
FAULT
NC
35
34
33
32
31
30
29
28
27
9
11
12
13
14
15
16
17
T
JMAX
= 125°C, θ
JA
= 32°C/W
EXPOSED PAD (PIN 53) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3597EUHG#PBF LT3597EUHG#TRPBF 3597
52-Lead (5mm × 8mm) Plastic QFN
–40°C to 125°C
LT3597IUHG#PBF LT3597IUHG#TRPBF 3597
52-Lead (5mm × 8mm) 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/
LT3597
3
3597fa
elecTrical characTerisTics
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Voltage
l
6 55 V
Quiescent Current from V
IN
EN/UVLO = 0.4V
BIAS = 5V, Not Switching
BIAS = 0V, Not Switching
2.1
4
2
4
6
µA
mA
mA
Minimum BIAS Voltage 3 3.1 V
Quiescent Current from BIAS EN/UVLO = 0.4V
BIAS = 5V, Not Switching
BIAS = 0V, Not Switching, Current Out of Pin
2
60
2
3
150
µA
mA
µA
EN Threshold (Falling) 0.4 0.7 V
UVLO Threshold (Falling) 1.47 1.51 1.53 V
EN/UVLO Pin Current (Hysteresis) EN/UVLO = 1.6V
EN/UVLO = 1.4V
4
10
5.1
6
nA
µA
FB1-3 Regulation Voltage 1.15 1.22 1.25 V
FB1-3 Pin Bias Current FB = 6V 200 nA
Maximum Duty Cycle R
T
= 220k (200kHz)
R
T
= 33.2k (1MHz)
90
78
95
85
%
%
Switch Saturation Voltage I
SW1-3
= 100mA 265 mV
Switch Current Limit 400 510 700 mA
DA Pin Current to Stop OSC 225 280 350 mA
Switch Leakage V
SW1-3
= 0V 700 nA
BST1-3 Pin Current I
SW1-3
= 100mA 2 mA
Switching Frequency R
T
= 220k
R
T
= 33.2k
170
900
200
1000
230
1100
kHz
kHz
SYNC Input Low 0.4 V
SYNC Input High 1.6 V
SYNC Frequency Range R
T
= 220k
R
T
= 47k
240
1000
kHz
kHz
SYNC Pin Bias Current V
SYNC
= 3.3V 200 nA
Soft-Start Time (Note 4) 2.5 ms
V
REF
Voltage I
VREF
= 0µA
l
1.96 2.0 2.04 V
Maximum V
REF
Current 200 µA
I
SET1-3
Pin Voltage R
ISET1-3
= 20k, V
CTRL
= V
CTRLM
= T
SET
= 1.5V 1.0 V
T
SET
Voltage for LED Current Derating 540 mV
T
SET
Pin Leakage Current V
TSET
= 1.0V 200 nA
I
LED1-3
LED Current R
ISET1-3
= 20k
l
98
97
100
100
102
103
mA
mA
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 24V, BOOST = 29V, BIAS = 5V, EN/UVLO = 5V, PWM1-3 = 3.3V,
CTRL1-3 = CTRLM = T
SET
= 2.0V, V
OUT1-3
= 24V, SYNC = 0V, unless otherwise specified. (Note 2)
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LT3597IUHG#PBF

Mfr. #:
Buy LT3597IUHG#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LED Lighting Drivers 60V 3x Buck LED Drvr
Lifecycle:
New from this manufacturer.
Delivery:
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