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Linear Technology Electronic Components Datasheet

LT3763 Datasheet

Step-Down LED Driver Controller

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LT3763
60V High Current
Step-Down LED Driver Controller
FEATURES
DESCRIPTION
n Accurately Control Input and Output Current
n 3000:1 True Color PWM™ Dimming
n ±1.5% Voltage Regulation Accuracy
n ±6% Current Regulation Accuracy
n 6V to 60V Input Voltage Range
n Wide Output Range Up to 55V
n <2µA Shutdown Current
n Control Pin for Thermal Control of Load Current
n Input and Output Current Monitor and Limit
n Open, Short, and C/10 Fault Detection
n PWM Driver Output for LED Applications
n Thermally Enhanced 28-Lead FE Package
APPLICATIONS
n High Power Architectural Lighting
n Automotive Lighting
n Aviation and Marine Strobe Lights
n Solar-Powered Chargers, Laser Diodes
All registered trademarks and trademarks are the property of their respective owners.
The LT®3763 is a fixed frequency, synchronous, step-down
DC/DC controller designed to accurately regulate output
currents up to 20A. The average current mode control-
ler will maintain inductor current regulation over a wide
output voltage range from 0V to 55V. Output current is
set by analog voltages on the CTRL pins and an external
sense resistor. Voltage regulation and overvoltage protec-
tion are set with a voltage divider from the output to the
FB pin. The switching frequency is programmable from
200kHz to 1MHz through an external resistor on the RT
pin or with the SYNC pin and an external clock signal.
Input and output current sensing provides input current
limiting and an accurate measurement of these currents.
The FBIN pin is provided for applications requiring a peak
power tracking function.
Additional features include an accurate external reference
voltage for use with the CTRL pins, an accurate UVLO/
EN pin that allows for programmable UVLO hysteresis,
a PWM driver for LED applications, output voltage fault
detection, and thermal shutdown.
TYPICAL APPLICATION
VIN
10V TO 30V
20A, Pulse Width Modulated, Single LED Driver
2.5mΩ
84.5k
1k 1µF 1k
4.7µF
100µF
2.2µF
1nF
1nF
15.4k
45.3k
IVINP IVINN
EN/UVLO
VREF
LT3763
CTRL2
VIN
TG
BOOST
SW
50k
50Ω
50Ω
470k
INTVCC
CTRL1
FBIN
IVINMON
ISMON
PWM
SYNC
RT
BG
GND
SENSE+
SENSE
PWMOUT
FAULT
FB
SS VC
47.5kΩ
82.5k 10nF
59k
4.7nF
220nF
22µF
33nF
1.5µH 2.5mΩ
VOUT
6V, 20A MAXIMUM
220µF
×2
10Ω 10Ω
47.5k
12.1k
3763 TA01
PWM
10V/DIV
VSW
50V/DIV
IL
5A/DIV
Document Feedback
For more information www.analog.com
PWM Dimming
5µs/DIV
3763 TA01b
Rev. C
1


Linear Technology Electronic Components Datasheet

LT3763 Datasheet

Step-Down LED Driver Controller

No Preview Available !

LT3763
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VSEINN, SEEN+/UanVdLOS,EINVSINEP,...a..n..d...I.V..I.N...N.................................................................6600VV
CTRL1, CTRL2, FB, and FBIN.......................................3V
SYNC and PWM...........................................................6V
INTVCC and FAULT.......................................................6V
VC, RT, and SS.............................................................3V
VREF, IVINMON, and ISMON.........................................3V
SW.............................................................................60V
BOOST.......................................................................66V
BOOST-SW...................................................................6V
Operating Junction Temperature (Notes 2, 3)
LT3763E/LT3763I............................... –40°C to 125°C
LT3763H............................................. –40°C to 150°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................... 300°C
PIN CONFIGURATION
TOP VIEW
BG 1
28 GND
INTVCC
VIN
EN/UVLO
2
3
4
27 BOOST
26 SW
25 TG
VREF 5
IVINN 6
24 PWM_OUT
23 GND
IVINP 7
IVINMON 8
29 22 PWM
GND 21 SYNC
FAULT 9
20 RT
FBIN 10
19 ISMON
FB 11
GND 12
CTRL2 13
18 VC
17 SENSE+
16 SENSE
CTRL1 14
15 SS
FE PACKAGE
28-LEAD PLASTIC TSSOP
θJA = 30°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3763EFE#PBF
LT3763EFE#TRPBF
LT3763FE
28-Lead Plastic TSSOP
–40°C to 125°C
LT3763IFE#PBF
LT3763IFE#TRPBF
LT3763FE
28-Lead Plastic TSSOP
–40°C to 125°C
LT3763HFE#PBF
LT3763HFE#TRPBF
LT3763FE
28-Lead Plastic TSSOP
–40°C to 150°C
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VEN/UVLO = 5V unless otherwise noted.
PARAMETER
Input Voltage Range
Supply Undervoltage Lockout
VIN Pin Quiescent Current
Non-Switching Operation
Shutdown Mode
EN/UVLO Pin Threshold (Falling Edge)
EN/UVLO Hysteresis
EN/UVLO Pin Current
SYNC Pin Threshold (Falling Edge)
CONDITIONS
From Low to High
VEN/UVLO = 1.4V, Not Switching
VEN/UVLO = 0V
EN/UVLO = 1.4V, VIN = 6V
MIN TYP MAX UNITS
6 60 V
3.75 4.0 4.25
V
1.7 3.5
0.2 2
1.47 1.52 1.57
185
5
1.4 1.5 1.6
mA
µA
V
mV
µA
V
SYNC Pin Hysteresis
675 mV
Rev. C
2 For more information www.analog.com


Part Number LT3763
Description Step-Down LED Driver Controller
Maker Linear Technology
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LT3763 Datasheet PDF






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