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LT3762 Datasheet

60V Synchronous Boost LED Controller

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LT3762
60V Synchronous Boost
LED Controller
FEATURES
nn 3000:1 External PWM Dimming
nn 250:1 Internal PWM Dimming
nn Wide VIN Operating Range: 2.5V to 38.5V
nn Synchronous Boost Output Voltage up to 60V
nn Spread-Spectrum Frequency Modulation for Lower EMI
nn PMOS Switch Driver for PWM and Output Disconnect
nn Constant Current (±3.5%) Regulation
nn Constant Voltage (±2%) Regulation
nn Rail-to-Rail LED Current Sense: 0V to 60V
nn Programmable VIN Undervoltage Lockout
nn Analog Dimming via Two Control Pins
nn 100kHz to 1MHz Operation
nn Programmable Open LED Protection with OPENLED Flag
nn Short-Circuit Protection and SHORTLED Flag
nn Drives LEDs in Boost, SEPIC, Buck Mode, or Buck-
Boost Mode Configurations
nn 28 Lead TSSOP and QFN (4mm × 5mm) Exposed
Pad Packages
APPLICATIONS
nn Industrial and Automotive Lighting
nn Accurate Current-Limited Voltage Regulators
DESCRIPTION
The LT®3762 is a synchronous DC/DC controller designed
to operate as a constant-current source and constant-
voltage regulator. It features a programmable internal
PWM dimming signal generator and a synchronous gate
driver. The LT3762 is ideally suited for driving high cur-
rent LEDs with high efficiency and reduced power loss.
Rail-to-rail switch current sensing enables synchronous
boost topologies and nonsynchronous topologies such
as SEPIC. A voltage feedback pin serves as the input for
several LED protection features and also allows the con-
verter to operate as a constant-voltage source.
A frequency adjust pin allows the user to program the
frequency from 100kHz to 1MHz to optimize efficiency,
performance and external component size. Adding a
capacitor at SSFM pin activates the Spread-Spectrum
Modulation feature to reduce EMI. The LT3762 also in-
cludes an integrated DC/DC converter to efficiently produce
a regulated 7.5V supply for the N-channel MOSFET gate
drivers. The PWM pin controls PWMTG to drive the P-
channel MOSFET, allowing a high PWM dimming range
(3000:1) and providing LED overcurrent protection and
short-circuit protected boost capability.
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. Patents, including 7199560, 7321203, 7746300. Patents pending.
TYPICAL APPLICATION
98% Efficient 60W Synchronous Boost LED Driver with 3V Minimum Input Voltage
VIN
3V TO 24V
4.7µF
×3
50V
576k
348k
66.5k
150k
INTERNAL PWM DUTY CYCLE
(0.4% TO 100%)
VDIM = 0V TO 3V
INTVCC
100k 100k
49.9k
82nF
800Hz
3.3nF
5.6k
6mΩ
22µH
VIN
EN/UVLO
SNSP SNSN
BG
SW
CTRL1
VREF
CTRL2
LT3762
BOOST
TG
FB
ISP
DIM
PWM
OPENLED
SHORTLED
VC
SSFM
RT
ISN
PWMTG
GND SS
AUXSW2
AUXSW1
AUXBST
INTVCC
6.8nF
39.2k
200kHz
0.1µF
10µF
10V
M2
M1
1M
0.1µF
36.5k
4.7µF
×4
50V
47µH
0.1µF
10V
50mΩ
M3
30V, 2A LED
CURRENT DERATED
FOR VIN < 8V
3762 TA01a
Document Feedback
For more information www.analog.com
Efficiency vs Input Voltage
100
98
96
94
92
90
88
86
0 4 8 12 16 20 24 28
INPUT VOLTAGE (V)
3762 TA01b
Rev 0
1


Analog Devices Semiconductor Electronic Components Datasheet

LT3762 Datasheet

60V Synchronous Boost LED Controller

No Preview Available !

LT3762
ABSOLUTE MAXIMUM RATINGS
(Note 1)
ISP, ISN......................................................................80V
VIN, EN/UVLO, SNSP, SNSN, SW (Note 7).................60V
CTRL1, CTRL2, OPENLED, SHORTLED.......................15V
FB, PWM, INTVCC, DIM................................................8V
VC, VREF, SS, SSFM......................................................3V
AUXSW1, AUXSW2, TG, BG, PWMTG
BOOST, AUXBST, RT........................................ (Note2)
Operating Junction Temperature Range (Note 3, 4)
LT3762E/LT3762I.................................... –40°C to 125°C
LT3762H................................................. –40°C to 150°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
EN/UVLO 1
28 INTVCC
OPENLED 2
27 AUXSW2
SHORTLED 3
26 AUXBST
PWM 4
25 AUXSW1
DIM 5
24 VIN
RT 6
23 SNSP
SSFM 7 29 22 SNSN
SS 8 GND 21 BG
VREF 9
CTRL1 10
20 BOOST
19 SW
CTRL2 11
18 TG
VC 12
FB 13
17 ISP
16 ISN
GND 14
15 PWMTG
FE PACKAGE
28-LEAD PLASTIC TSSOP
θJA = 30°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
28 27 26 25 24 23
PWM 1
22 AUXSW1
DIM 2
RT 3
21 VIN
20 SNSP
SSFM 4
SS 5
29 19 SNSN
GND 18 BG
VREF 6
CTRL1 7
17 BOOST
16 SW
CTRL2 8
15 TG
9 10 11 12 13 14
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
θJA = 43°C/W, θJC = 3.4°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION http://www.linear.com/product/LT3762#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3762EFE#PBF
LT3762EFE#TRPBF
LT3762
28-Lead Plastic TSSOP
-40°C to 125°C
LT3762IFE#PBF
LT3762IFE#TRPBF
LT3762
28-Lead Plastic TSSOP
-40°C to 125°C
LT3762HFE#PBF
LT3762HFE#TRPBF
LT3762
28-Lead Plastic TSSOP
-40°C to 150°C
LT3762EUFD#PBF
LT3762EUFD#TRPBF
3762
28-Lead Plastic QFN
-40°C to 125°C
LT3762IUFD#PBF
LT3762IUFD#TRPBF
3762
28-Lead Plastic QFN
-40°C to 125°C
LT3762HUFD#PBF
LT3762HUFD#TRPBF
3762
28-Lead Plastic QFN
-40°C to 150°C
Consult ADI Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
Rev 0
2 For more information www.analog.com


Part Number LT3762
Description 60V Synchronous Boost LED Controller
Maker Analog Devices
PDF Download

LT3762 Datasheet PDF






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