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LT3754IUH#PBF

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LT3754
1
3754fc
Typical applicaTion
DescripTion
16-Channel
×
50mA
LED Driver
The LT
®
3754 is a 16-channel LED driver with a step-up
DC/DC controller capable of driving up to 45V of LEDs.
Each channel contains an accurate current sink with ±2.8%
current matching. Channels follow a master programmable
current to allow between 10mA to 50mA of LED current
per string. Channels can be paralleled for higher LED
current. Output voltage adapts to variations in LED V
F
for
optimum efficiency and open LED faults do not affect the
operation of connected LED strings.
The LT3754 allows a PWM dimming range up to 3000:1
and an analog dimming range up to 25:1. Operating
frequency can be programmed from 100kHz up to 1MHz
using a single resistor or synchronized to an external clock.
Additional features include: programmable maximum
V
OUT
for open LED protection, a fault flag for open LED,
programmable LED current derating vs temperature,
micropower shutdown and internal soft-start. The LT3754
is available in a thermally enhanced 5mm × 5mm 32-pin
QFN package.
L, LT , LT C and 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, 7321203.
FeaTures
applicaTions
n
Automotive, Notebook and TV Monitor Backlighting
n
Up to 45V of LEDs × 50mA, 16-Channel LED Driver
n
Wide Input Range : 6V to 40V (4.5V to 13V,
V
IN
Connected to INTV
CC
)
n
±2.8% LED Current Matching at 20mA (Typ ±0.7%)
n
Up to 3000:1 True Color PWM™ Dimming Range
n
Single Resistor Sets LED Current (10mA to 50mA)
n
LED Current Regulated Even for PV
IN
> V
OUT
n
Output Adapts to LED V
F
for Optimum Efficiency
n
Fault Flag + Protection for Open LED Strings
n
Protection for LED Pin to V
OUT
Short
n
Parallel Channels for Higher LED Current
n
Programmable LED Current Derating vs Temperature
n
Accurate Undervoltage Lockout Threshold with
Programmable Hysteresis
n
Programmable Frequency (100kHz to 1MHz)
n
Synchronizable to an External Clock
Worst-Case Channels LED Current Matching
(Normalized to 16-Channel Average)
92% Efficient, 36W Backlight LED Driver
LT3754
GATE
5×
2.2µF
10µH
0.015Ω
V
OUT
SENSE
LED1
LED2
CTRL
PWM
V
REF
T
SET
OVP
SET
RTGND
I
SET
V
C
SYNC
V
IN
V
IN
10V
PV
IN
24V
4.7µF
4.7µF
INTV
CC
40.2k
499k
•
•
•
•
•
•
•
•
•
•
•
•
11k30.9k
20k
39.2k 5.76k 10k
100k
16 CHANNELS
2.2nF
3754 TA01
SHDN/UVLO
FAULT
LED15
LED16
•
•
•
•
•
•
•
•
V
IN
4.7µF
• • • •
UP TO 45V OF LEDs PER STRING
20k
JUNCTION TEMERATURE (°C)
–50 –25
LED CURRENT MATCHING (%)
0.8
0.4
0.0
–0.4
–0.8
1000 25
3754 TA01
12550 75
R
ISET
= 14.7k (I(LED) = 20mA)
LT3754
2
3754fc
pin conFiguraTionabsoluTe MaxiMuM raTings
V
OUT
, LED1-16 ..........................................................60V
V
IN
, SHDN/UVLO, FA U LT ...........................................40V
INTV
CC
...................................................................... 13V
INTV
CC
above V
IN
...................................................+0.3V
PWM, CTRL, SYNC .....................................................6V
V
C
...............................................................................3V
V
REF
, RT, I
SET
, T
SET
, OVP
SET
.......................................2V
SENSE ......................................................................0.4V
Operating Junction Temperature Range
(Notes 2,3) ............................................. –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
(Note 1)
33
1
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17
LED16
LED15
LED14
LED13
LED12
LED11
LED10
LED9
LED1
LED2
LED3
LED4
LED5
LED6
LED7
LED8
TOP VIEW
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
I
SET
V
REF
T
SET
CTRL
OVP
SET
PWM
V
C
RT
SENSE
GATE
INTV
CC
V
IN
SHDN/UVLO
FAULT
SYNC
V
OUT
32 31 30 29 28 27 26 25
9 10 11 12 13 14 15 16
T
JMAX
= 125°C, θ
JA
= 34°C/W, θ
JC
= 3°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
LT3754EUH#PBF LT3754EUH#TRPBF 3754 32-Lead (5mm × 5mm) Plastic QFN –40°C to 125°C
LT3754IUH#PBF LT3754IUH#TRPBF 3754 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 LT C 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/
LT3754
3
3754fc
elecTrical characTerisTics
PARAMETER CONDITIONS MIN TYP MAX UNITS
INPUT BIAS, REFERENCE
Minimum Operational V
IN
(To Allow GATE Switching) V
C
= 1.5V
V
IN
= INTV
CC
(Shorted)
V
IN
≠ INTV
CC
l
l
4.2
5.5
4.5
6.0
V
V
Operational V
IN
V
IN
= INTV
CC
(Shorted)
V
IN
≠ INTV
CC
4.5
6
13
40
V
V
V
IN
Quiescent Current LEDx = 1.2V
CTRL = 0.1V, PWM = 0V
CTRL = 0.1V, PWM = 1.5V, (Not Switching)
4.2
9.5
5.7
12
mA
mA
V
IN
Shutdown Current (V
IN
≠ INTV
CC
) (Not Shorted) SHDN/UVLO = 0V, V
IN
=6V
SHDN/UVLO = 0V, V
IN
= 40V
0.1 2
10
µA
µA
V
IN
Shutdown Current (V
IN
= INTV
CC
(Shorted)) SHDN/UVLO = 0V, V
IN
= INTV
CC
= 4.5V
SHDN/UVLO = 0V, V
IN
= INTV
CC
= 13V
10
20
20
40
µA
µA
SHDN/UVLO Threshold (Micropower) (Falling) (V
SD
) I
VIN
< 20µA
l
0.3 0.7 V
SHDN/UVLO Threshold (UVLO) (Falling)
(Stop Switching) (V
UV
)
l
1.414 1.476 1.538 V
SHDN/UVLO Pin Current SHDN/UVLO = V
UV
- 50mV
SHDN/UVLO = V
UV
+ 50mV
l
1.6
2.4
0
3.2 µA
µA
V
REF
Voltage I
VREF
= 0µA
l
1.450 1.485 1.524 V
V
REF
Line Regulation I
VREF
= 0µA, 6V < V
IN
< 40V 0.01 0.05 %/V
V
REF
Load Regulation 0 < I
VREF
< 150µA (Max) 2 mV
OSCILLATOR
Frequency: f
OSC
(100kHz) RT
= 523k
l
92 101 112 kHz
Frequency: f
OSC
(1MHz) RT
= 39.2k
l
0.90 1 1.10 MHz
f
OSC
(1MHz) Line Regulation RT
= 39.2k, 6V < V
IN
< 40V 0.1 0.2 %/V
RT Pin Voltage RT = 39.2k 1.6 V
Minimum Off-Time
Minimum On-Time
(Note 5)
(Note 5)
170
190
250
250
nS
nS
SYNC Input High Threshold 2.2 V
SYNC Input Low Threshold 0.6 V
SYNC Input Current SYNC = 0V
SYNC = 5V
0
25
µA
µA
SYNC Frequency Range RT = 523k
RT = 39.2k
0.12
1.2
1.5
1.5
MHz
MHz
LINEAR REGULATOR (INTV
CC
)
INTV
CC
Regulation Voltage V
IN
= 12V 6.65 7 7.35 V
Dropout (V
IN
- INTV
CC
) I
INTVCC
= 10mA 250 mV
INTV
CC
UVLO (+) (Start Switching) 3.8 V
INTV
CC
UVLO (–) (Stop Switching) 3.4 V
INTV
CC
Current Limit
l
44 57 mA
OVP/LED ERROR AMPLIFIERS
Transconductance (OVP) ∆I
VC
= ±2.5µA 4 µmhos
Voltage Gain (OVP) 5 V/V
Transconductance (LED) ∆I
VC
= ±2.5µA 33 µmhos
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= V
OUT
= 6V, R
ISET
= 14.7k unless otherwise noted.
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LT3754IUH#PBF

Mfr. #:
Buy LT3754IUH#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LED Lighting Drivers 16-Ch 50mA LED Drvr
Lifecycle:
New from this manufacturer.
Delivery:
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