LT3760 Datasheet PDF - Linear Technology

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LT3760
Linear Technology

Part Number LT3760
Description 8-Channel X 100mA LED Driver
Page 30 Pages


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LT3760
8-Channel × 100mA
LED Driver
Features
n Up to 45V of LEDs × 100mA, 8-Channel LED Driver
n Wide Input Range : 6V to 40V
n ±2% LED Current Matching at 40mA (Typ ±0.7%)
n Up to 3000:1 True Color PWM™ Dimming Range
n Single Resistor Sets LED Current (20mA to 100mA)
n LED Current Regulated Even for PVIN > VOUT
n Output Adapts to LED VF for Optimum Efficiency
n Fault Flag + Protection for Open LED Strings
n Protection for LED Pin to VOUT 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
Applications
n Automotive, Notebook and TV Monitor Backlighting
L, LT, LTC and 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.
Description
The LT®3760 is an 8-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%
current matching. Channels follow a master programmable
current to allow between 20mA to 100mA of LED current
per string. Channels can be paralleled for higher LED
current. Output voltage adapts to variations in LED VF for
optimum efficiency and open LED faults do not affect the
operation of connected LED strings.
The LT3760 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 VOUT
for open LED protection, a fault flag for open LED, program-
mable LED current derating vs temperature, micropower
shutdown and internal soft-start. The LT3760 is available
in a thermally enhanced 28-pin TSSOP Package.
wwwT.DyatapShieceta4Ul.comApplication
PVIN
20V TO 36V
VIN
8V TO 14V
92% Efficient, 36W Backlight LED Driver
4.7µF
10µH
UP TO 45V OF LEDs PER STRING
4.7µF
499k
INTVCC
4.7µF
VIN
GATE
SENSE
5s
2.2µF
••••
SHDN/UVLO
0.015Ω
40.2k
CTRL
PGND
VOUT
••• •••
•• ••
20k
30.9k
PWM
REF
TSET
LT3760
LED1
LED2
LE••••D7
LED8
11k FAULT
OVPSET
GND RT
ISET
VC SYNC
20k
39.2k
1MHz
5.76k
10k
2.2nF
•••• 8 CHANNELS s 100mA
100k
VIN
3760 TA01
Worst-Case Channels LED Current Matching
(Normalized to 8-Channel Average)
0.8
0.4
0.0
– 0.4
RISET = 14.7k (I(LED) = 40mA)
– 0.8
–50 –25 0 25 50 75
100 125
JUNCTION TEMERATURE (°C)
3760 TA01
3760f




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LT3760
Absolute Maximum Ratings
(Note 1)
VOUT, LED1-8.............................................................60V
VIN, SHDN/UVLO, FAULT...........................................40V
INTVCC....................................................................... 13V
INTVCC above VIN.................................................. +0.3V
PWM, CTRL, SYNC.....................................................6V
VC ................................................................................3V
VREF, RT, ISET, TSET, OVPSET.......................................2V
SENSE...................................................................... 0.4V
Operating Junction Temperature Range
(Notes 2,3).............................................-40°C to 125°C
Storage Temperature Range...................-65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
Pin Configuration
TOP VIEW
CTRL 1
TSET
VREF
ISET
NC
2
3
4
5
LED1 6
LED2 7
LED3 8
LED4 9
PGND 10
SENSE 11
GATE 12
INTVCC 13
VIN 14
29
PGND
28 OVPSET
27 PWM
26 VC
25 RT
24 GND
23 LED8
22 LED7
21 LED6
20 LED5
19 PGND
18 VOUT
17 SYNC
16 FAULT
15 SHDN/UVLO
FE PACKAGE
28-LEAD PLASTIC TSSOP
TJMAX = 125°C, θJA = 28°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 29) IS PGND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3760EFE#PBF
LT3760EFE#TRPBF
LT3760FE
28-Lead Plastic TSSOP
–40°C to 125°C
LT3760IFE#PBF
LT3760IFE#TRPBF
LT3760FE
28-Lead Plastic TSSOP
–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.
wwwC.DoanstauSlthLeTeCt4MUa.rckoemting 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/
3760f




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LT3760
E lectrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = VOUT = 6V, RISET = 14.7k unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX
INPUT BIAS, REFERENCE
Minimum Operational VIN (To Allow GATE Switching)
Operational VIN
VIN Quiescent Current
VIN Shutdown Current (VIN ≠ INTVCC) (Not Shorted)
VIN Shutdown Current (VIN = INTVCC (Shorted))
SHDN/UVLO Threshold (Micropower) (Falling) (VSD)
SHDN/UVLO Threshold (UVLO) (Falling)
(Stop Switching) (VUV)
SHDN/UVLO Pin Current
VREF Voltage
VREF Line Regulation
VREF Load Regulation
OSCILLATOR
VC = 1.5V
VVIINN
=
IINNTTVVCCCC
(Shorted)
l
l
VVIINN
=
IINNTTVVCCCC
(Shorted)
4.5
6
CTRL = 0.1V, PWM = 0V
CTRL = 0.1V, PWM = 1.5V, (Not Switching)
LED1–8 = 1.2V
SHDN/UVLO = 0V, VIN =6V
SHDN/UVLO = 0V, VIN = 40V
SHDN/UVLO = 0V, VIN = INTVCC = 4.5V
SHDN/UVLO = 0V, VIN = INTVCC = 13V
IVIN < 20µA
l 0.3
l 1.414
4.2
5.5
4.2
9.5
0.1
10
20
0.7
1.476
4.5
6.0
13
40
5.7
12
2
10
20
40
1.538
SHDN/UVLO = VUV - 50mV
SHDN/UVLO = VUV + 50mV
IVREF = 0µA
IVREF = 0µA, 6V < VIN < 40V
0 < IVREF < 150µA (Max)
l 1.6
l 1.450
2.4
0
1.485
0.01
2
3.2
1.524
0.05
Frequency: fOSC (100kHz)
Frequency: fOSC (1MHz)
fOSC (1MHz) Line Regulation
RT Pin Voltage
RT = 523k
RT = 39.2k
RT = 39.2k, 6V < VIN < 40V
RT = 39.2k
l 92
101 112
l 0.90 1 1.10
0.1 0.2
1.6
Minimum Off-Time
wwwM.DinaitmaSuhmeOetn4-UTi.mcoem
(Note 5)
(Note 5)
170 250
190 250
SYNC Input High Threshold
2.2
SYNC Input Low Threshold
0.6
SYNC Input Current
SYNC = 0V
SYNC = 5V
0
25
SYNC Frequency Range
RT = 523k
RT = 39.2k
0.12 1.5
1.2 1.5
LINEAR REGULATOR (INTVCC)
INTVCC Regulation Voltage
Dropout (VIN - INTVCC)
INTVCC UVLO (+)
INTVCC UVLO (-)
INTVCC Current Limit
OVP/LED ERROR AMPLIFIERS
VIN = 12V
IINTVCC = 10mA
(Start Switching)
(Stop Switching)
6.65 7 7.35
250
3.8
3.4
l 40
57
Transconductance (OVP)
Voltage Gain (OVP)
∆IVC = ±2.5µA
4
5
Transconductance (LED)
∆IVC = ±2.5µA
33
UNITS
V
V
V
V
mA
mA
µA
µA
µA
µA
V
V
µA
µA
V
%/V
mV
kHz
MHz
%/V
V
nS
nS
V
V
µA
µA
MHz
MHz
V
mV
V
V
mA
µmhos
V/V
µmhos
3760f




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LT3760
E lectrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = VOUT = 6V, RISET = 14.7k unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX
Voltage Gain (LED)
45
VC Source Current (Out of Pin)
VC Sink Current (OVP)
VC Sink Current (LED)
VC Output High (clamp) (VCOH)
VC Output Low (clamp) (VCOL)
VC Switching Threshold (VCSW)
SENSE AMP
VC = 1.5V, VLEDx = 0.8V, OVPSET = 1.5V
VC = 1.5V, VLEDx = 0.8V, OVPSET = 0V
VC = 1.5V, VLEDx = 1.2V, OVPSET = 1.5V
10
15
9
2.3
0.8
1.1
SENSE Input Current (Out of Pin)
65
SENSE Current Limit Threshold
l 44 52 60
Current Mode Gain
SENSE Over Current Limit Threshold
V(VC)/V(SENSE)
l 90
6
100 110
LED CURRENT / CONTROL
ISET Pin Voltage
LEDx Current (40mA) (RISET = 14.7k)
LEDx Current Matching (40mA) (RISET = 14.7k)
LEDx Current (100mA) (RISET = 5.76k)
LED Pin Regulation Voltage
CTRL = 1.5V
VLEDx = 1V, CTRL = 1.5V
VLEDx = 1V, CTRL = 1.5V
VLEDx = 1V, CTRL = 1.5V
38.3
l
95.5
1.00
40.1
±0.7
100.7
1.1
41.9
±2
105.9
TSET Threshold
ANALOG DIMMING
630
CTRL Input Current (Out of Pin)
CTRL = 1V
CTRL = 0.04V
40 200
50 200
LEDx Current (Dimming 25:1)
wwwP.DWaMtaSDIhMeeMtI4NUG.com
PWM Input Low Threshold
VLEDx = 1V, CTRL = 0.04V
1.6
0.7 1
PWM Input High Threshold
1.1 1.4
PWM Input Current
PWM = 1.5V
PWM = 6V
6
24
VOUT Pin Current in PWM Mode V(VOUT) = 60V
LEDx Leakage Current
(PWM = 0V)
FAULT DIAGNOSTICS
PWM = 1.5V, VLEDx = 1V
PWM = 0V, VLEDx = 1V
VLEDx = 1V, VOUT = 12V
VLEDx = 50V, VOUT = 60V
370
20
0.1 1
0.1 2
FAULT Output Sink Current
LEDx Short Threshold (VSH)
(VOUT – VLEDx)
LED Open Detection Threshold
LED1 = Open, VFAULT = 0.3V
VOUT = 12V
VOUT = 60V
VOUT = 12V
0.3 0.6
6
6
0.5
UNITS
V/V
µA
µA
µA
V
V
V
µA
mV
V/V
mV
V
mA
%
mA
V
mV
nA
nA
mA
V
V
µA
µA
µA
µA
µA
µA
mA
V
V
3760f




LT3760 datasheet pdf
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