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LT3964 Datasheet

Dual 36V Synchronous 1.6A Buck LED Driver

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LT3964
Dual 36V Synchronous 1.6A
Buck LED Driver with I2C
FEATURES
nn Wide Input Voltage Range: 4V to 36V
nn Two Independent 1.6A/40V Synchronous Bucks
nn I2C Interface for Internal True Color PWM™ Dimming
(8192:1), Analog Dimming and Fault Reporting
nn 1000:1 External True Color PWM Dimming and
10:1 External Analog Dimming
nn PMOS Switch Driver for PWM and Output Disconnect
nn ±3% Constant Current Regulation
nn Adjustable Frequency: 200kHz to 2MHz
nn Frequency Synchronization with Clock Output
nn Programmable OPENLED Protection with Reporting
nn Short-Circuit Protection with Reporting
nn Programmable Undervoltage Lockout with Hysteresis
nn Internal Compensation
nn 9 Unique Device Addresses for I2C
nn Available in 5mm × 6mm 36-Lead QFN Package
APPLICATIONS
nn General Purpose, Industrial, Medical and
Automotive Lighting
nn Constant-Current, Constant-Voltage Source
DESCRIPTION
The LT®3964 is a dual synchronous step-down DC/DC
converter with I2C interface designed to operate as a
constant-current and constant-voltage source and is ideal
for driving LEDs. The fixed frequency and peak current
mode topology result in stable operation over a wide range
of supply and output voltages. The ground referred volt-
age FB pin serves as the input for several LED protection
features, and also allows the converter to operate as a
constant-voltage source. The maximum output current is
set by an external resistor, and the output current ampli-
fier has a rail-to-rail common mode range. LT3964 uses
an I2C interface to communicate with a microcontroller
to read LED faults, write PWM and analog dimming reg-
isters and set fault masking. The I2C PWM input provides
LED dimming ratios up to 8192:1. The I2C programmable
CTRL register sets the gain of the external CTRL pin, and
maximum current sense threshold, providing additional
analog dimming capability.
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. Patents, including 7199560, 7321203, 7746300.
TYPICAL APPLICATION
50W Dual Buck 1A LED Driver
31V TO 36V
(ENABLED AT 33V,
SHUTDOWN
AT 31V)
10µF
×2
100k
VIN1
2.2µF
GND
BST1
SW1
EN/UVLO
3.92k PWM1
PWM2
INTVCC
PWM1
PWM2
CTRL1
CTRL2
INTVCC
2.2µF 100k
ALERT
LT3964
VIN2
INTVCC
2.2µF
499k GND
FB1
ISP1
ISN1
PWMTG1
BST2
SW2
165k 22M7.H4kz
I2C
2-WIRE
INTERFACE
TSET
RT FB2
SYNC/CLKOUT
ISP2
SCL ISN2
SDA PWMTG2
ADDR1 ADDR2
INTVCC
3964 TA01a
0.22µF 10µH
1M
100mΩ
2.2µF
43.2k
0.22µF
10µH
1M
100mΩ
2.2µF
43.2k
1A,
8 LEDs
UP TO
26V
1A,
8 LEDs
UP TO
26V
For more information www.linear.com/LT3964
Efficiency, VIINN = 34V
100 BOTH CHANNELS ARE ON
95
90
85
80
75
70
100 200 300 400 500 600 700 800 900 1000
ILED (mA)
3964 TA01b
3964fb
1


Analog Devices Semiconductor Electronic Components Datasheet

LT3964 Datasheet

Dual 36V Synchronous 1.6A Buck LED Driver

No Preview Available !

LT3964
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN1, VIN2, EN/UVLO..................................................40V
ISP1, ISN1, ISP2, ISN2...............................................40V
PWMTG1, PWMTG2, RT........................................Note 2
SW1, SW2..................................................................40V
BST1, BST2.............................................................44.5V
BST1 to SW1, BST2 to SW2.....................................4.5V
FB1, FB2, CTRL1, CTRL2, ADDR1, ADDR2...................5V
SYNC/CLKOUT, PWM1, PWM2, TSET...........................6V
SDA, SCL, ALERT.........................................................6V
INTVCC...................................................................Note 3
Operating Junction Temperature (Notes 4, 5)
LT3964E/LT3964I............................... –40°C to 125°C
LT3964H............................................. –40°C to 150°C
Storage Temperature Range................... –60°C to 150°C
PIN CONFIGURATION
TOP VIEW
36 35 34 33 32 31 30 29
RT 1
28 ISP1
CTRL1 2
27 ISN1
CTRL2 3
26 PWMTG1
EN/UVLO 4
25 SGND
INTVCC 5
ALERT 6
37
PGND
24 FB1
23 FB2
PWM1 7
22 SGND
PWM2 8
21 PWMTG2
SDA 9
20 ISN2
SCL 10
19 ISP2
11 12 13 14 15 16 17 18
UHE PACKAGE
36-LEAD (5mm × 6mm) PLASTIC QFN
θJA = 43°C/W, θJC = 5°C/W
EXPOSED PAD (PIN 37) IS PGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION http://www.linear.com/product/LT3964#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3964EUHE#PBF
LT3964EUHE#TRPBF
3964
36-Lead (5mm × 6mm) Plastic QFN
–40°C to 125°C
LT3964IUHE#PBF
LT3964IUHE#TRPBF
3964
36-Lead (5mm × 6mm) Plastic QFN
–40°C to 125°C
LT3964HUHE#PBF
LT3964HUHE#TRPBF 3964
36-Lead (5mm × 6mm) Plastic QFN
–40°C to 150°C
Consult ADI Marketing for parts specified with wider operating temperature ranges.
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.
3964fb
2 For more information www.linear.com/LT3964


Part Number LT3964
Description Dual 36V Synchronous 1.6A Buck LED Driver
Maker Analog Devices
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LT3964 Datasheet PDF






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