LED Dimmer. LT3965-1 Datasheet

LT3965-1 Dimmer. Datasheet pdf. Equivalent

LT3965-1 Datasheet
Recommendation LT3965-1 Datasheet
Part LT3965-1
Description 8-Switch Matrix LED Dimmer
Feature LT3965-1; LT3965/LT3965-1 8-Switch Matrix LED Dimmer FEATURES n Eight Independent 17V 330mΩ NMOS Switches n I.
Manufacture Analog Devices
Datasheet
Download LT3965-1 Datasheet




Analog Devices LT3965-1
LT3965/LT3965-1
8-Switch Matrix LED Dimmer
FEATURES
n Eight Independent 17V 330mΩ NMOS Switches
n Independent On/Off/Dimming Control of 1 to 4 LEDs
for Each Switch
n I2C Multidrop Serial Interface with Programmable
Open LED and Shorted LED Fault Reporting
n 16 Unique I2C Addresses
n VDD Range: 2.7V to 5.5V and VIN Range: 8V to 60V
n Digital Programmable 256:1 PWM Dimming
n Fade Transition Between PWM Dimming States
n Optional Internal Clock Generator or External Clock
Source for PWM Dimming
n Open LED Overvoltage Protection
n Flicker Free PWM Dimming
n AEC-Q100 Qualified for Automotive Applications
APPLICATIONS
n Automotive LED Headlight Clusters
n Large LED Displays
n Automated Camera Flash Equipment
n RGBW Color Mixing Lighting
All registered trademarks and trademarks are the property of their respective owners.
DESCRIPTION
The LT®3965/LT3965-1 is an LED bypass switching
device for dimming individual LEDs in a string using a
common current source. It features eight individually
controlled floating source 17V/330mΩ NMOS switches.
The eight switches can be connected in parallel and/or
in series to bypass current around one or more LEDs in
a string. The LT3965 is initialized with all switches off
(LEDs on), and the LT3965-1 is initialized with all switches
on (LEDs off)The LT3965/LT3965-1 uses the I2C serial
interface to communicate with the microcontroller. Each
of the eight channels can be independently programmed
to bypass the LED string in constant on or off, or PWM
dimming with or without fade transition. Using the fade
option provides 11-bit resolution logarithmic transition
between PWM dimming states. The LT3965/LT3965-1
provides an internal clock generator and also supports
external clock source for PWM dimming. The LT3965/
LT3965-1 reports fault conditions for each channel such
as open LED and shorted LED. The four address select
pins allow 16 LT3965/LT3965-1 devices to share the I2C
bus. The device is available in a 28-lead TSSOP package.
TYPICAL APPLICATION
Matrix LED Dimmer Powered by a Buck Mode LED Driver
750Ω
Q1
Q2
1k
BIAS UVLO DETECT
BIAS
1k
M1
VIN
0.5Ω
40V
LED+
D4
BIAS
1µF
100V
1k
LED+
49.9k
Q3
EN/UVLO
VIN ISP
EN/UVLO
ISN
20k
INTVCC
PWM
PWMOUT
2.2nF
SYNC
LT3955 VMODE
VREF
FB
CTRL
1µF
50V
PGND
GND
GNDK
SW
RT
DIM/SS VC
28.7k
375kHz
0.1µF
0.01µF
IN4148 28k
D2
D3
0.1µF
100V
1µF
500mA
DRN8
SRC8
DRN7
SRC7
DRN6
SRC6
DRN5
SRC5
VIN
VDD
LT3965/
LT3965-1
SDA
SCL
ALERT
EN/UVLO
VCC
5V
0.1µF 10k 10k 10k
SDA
SCL
ALERT
EN/UVLO
VLED
26V
DRN4
SRC4
DRN3
RTCLK
28k
500Hz DIMMING FREQUENCY
SRC3
ADDR1
D1
L1
33µH
D5
LED
DRN2
SRC2
DRN1
SRC1
ADDR2
ADDR3
ADDR4
GND LEDREF
L1: WURTH 744066330
D1: DFLS260
D2, D3: CMSD6263S 2 IN 1 PACKAGE
D4, D5: PMEG6010CEH
M1: VISHAY Si7309DN
Q1, Q3: ZETEX FMMT593
Q2: ZETEX FMMT493
3965 TA01
9.09k
Rev. B
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Analog Devices LT3965-1
LT3965/LT3965-1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN.............................................................................60V
VIN-SRC[8:1]...........................................................–0.3V
DRN[8:1]....................................................................60V
SRC[8:1].....................................................................60V
LEDREF......................................................................60V
DRN[8:1]-SRC[8:1] (Each Channel).................–0.3V, 25V
EN/UVLO.................................................................... 12V
VDD..............................................................................6V
SDA, SCL, ALERT............................. –0.3V to VDD + 0.3V
RTCLK..........................................................................6V
ADDR[4:1]....................................................................6V
Operating Junction Temperature Range (Note 2)
LT3965E/LT3965E-1/LT3965I/LT3965I-1.–40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
DRN8 1
28 SRC8
VIN 2
EN/UVLO 3
27 DRN7
26 SRC7
ALERT 4
25 DRN6
SCL 5
24 SRC6
SDA 6
23 DRN5
VDD 7
RTCLK 8
29
22 SRC5
GND
21 DRN4
ADDR1 9
20 SRC4
ADDR2 10
19 DRN3
ADDR3 11
18 SRC3
ADDR4 12
17 DRN2
LEDREF 13
16 SRC2
SRC1 14
15 DRN1
FE PACKAGE
28-LEAD PLASTIC TSSOP
θJC = 10°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
LT3965EFE#PBF
LT3965EFE#TRPBF
LT3965FE
28-Lead Plastic TSSOP
–40°C to 125°C
LT3965EFE-1#PBF
LT3965EFE-1#TRPBF LT39651FE
28-Lead Plastic TSSOP
–40°C to 125°C
LT3965IFE#PBF
LT3965IFE#TRPBF
LT3965FE
28-Lead Plastic TSSOP
–40°C to 125°C
LT3965IFE-1#PBF
LT3965IFE-1#TRPBF
LT39651FE
28-Lead Plastic TSSOP
–40°C to 125°C
AUTOMOTIVE PRODUCTS**
LT3965EFE#WPBF
LT3965EFE#WTRPBF LT3965FE
28-Lead Plastic TSSOP
–40°C to 125°C
LT3965IFE#WPBF
LT3965IFE#WTRPBF
LT3965FE
28-Lead Plastic TSSOP
–40°C to 125°C
LT3965EFE-1#WPBF
LT3965EFE-1#WTRPBF LT39651FE
28-Lead Plastic TSSOP
–40°C to 125°C
LT3965IFE-1#WPBF
LT3965IFE-1#WTRPBF LT39651FE
28-Lead Plastic TSSOP
–40°C to 125°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.
**Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These
models are designated with a #W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your
local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for
these models.
Rev. B
2
For more information www.analog.com



Analog Devices LT3965-1
LT3965/LT3965-1
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 40V, VDD = EN/UVLO = 5V, LEDREF = 3V, SRC = 0V, ADDR[4:1] not
connected, unless otherwise noted.
PARAMETER
CONDITIONS
VDD Input Supply Voltage
VDD Operating IQ
VDD Shutdown IQ
SCL = SDA =5V (I2C Bus Idle), RTCLK = 28k
EN/UVLO < 0.4V
EN/UVLO = 1.15V
VIN Operating Voltage
VIN Operating IQ (Channel Not Switching)
All Channels VOTH[1:0] = VSTH[1:0] = “00” (Note 3)
All Channels VOTH[1:0] = VSTH[1:0] = “00”, LED ON
All Channels VOTH[1:0] = VSTH[1:0] = “11”, LED OFF
All Channels VOTH[1:0] = “11”, VSTH[1:0] = “00”,
LED ON
VIN Shutdown IQ
DRN[8:1] Operating Voltage
EN/UVLO < 1.15V
SRC[8:1] Operating Voltage
Current Out of SRC[8:1] Pins (Each Channel) Channel LED Is On (Channel Switch Is Off)
Channel LED Is Off (Channel Switch Is On)
Switch On-Resistance
Switch Leakage Current
Switch Transition Time (tr/tf)
DRN[8:1] to SRC[8:1] Crowbar Protection
Clamp Voltage
DRN = 16V, VOTH[1:0] = 11
DRN to 10V through 50Ω Resistor
LED or Switch Bypass Current is 500mA
Response Time from SW Crowbar Protection LED or Switch Bypass Current is 500mA
to SW Secure Protection
Programmable Open LED Threshold (VOTH)
Programmable Shorted LED Threshold (VSTH)
for LEDREF = 0V
Programmable Shorted LED Threshold (VSTH)
for LEDREF = 3V
Programmable Shorted LED Threshold (VSTH)
for LEDREF ≥ 4V
EN/UVLO Threshold Voltage Falling
VOTH[1:0] = “00” (Note 3)
VOTH[1:0] = “01” (LT3965-1 POR State)
VOTH[1:0] = “10”
VOTH[1:0] = “11” (LT3965 POR State)
VSTH[1:0] = “00” (Note 3)
VSTH[1:0] = “01”
VSTH[1:0] = “10”
VSTH[1:0] = “11”
VSTH[1:0] = “00” (Note 3)
VSTH[1:0] = “01”
VSTH[1:0] = “10”
VSTH[1:0] = “11”
VSTH[1:0] = “00” (Note 3)
VSTH[1:0] = “01”
VSTH[1:0] = “10”
VSTH[1:0] = “11”
EN/UVLO Threshold Voltage Rising Hyst.
EN/UVLO Input Bias Current Low
EN/UVLO = 1.15V
EN/UVLO Input Bias Current High
EN/UVLO = 1.33V
RTCLK Programmable Internal Oscillator or External Clock Source
LED PWM Dimming Frequency
(=RTCLK Programmed Oscillator
Frequency/2048 or External Clock
Frequency/2048)
RTCLK = 80.6kΩ
RTCLK = 28kΩ
RTCLK = 10kΩ
MIN
l 2.7
l
8
l
l
l
l
0.35
l
l
l 4.25
l 8.5
l 12.75
l 17
l 0.85
l 0.85
l 0.85
l 0.85
l 0.85
l 3.8
l 6.7
l 9.6
l 0.85
l 4.7
l 8.5
l 12.3
l 1.15
2.2
l 170
l 450
l 950
TYP
MAX UNITS
5.5
V
1.3
1.8
mA
0.1
1
µA
8
µA
60
V
1
1.4
mA
2.5
3.3
mA
1.5
2
mA
0.1
1
µA
VIN – 3V
V
VIN – 7.1V
V
9
13
µA
40
55
µA
330
5
µA
0.5
0.65
µs
22
25
V
1
1.6
µs
4.5
4.75
V
9
9.5
V
13.5
14.25
V
18
19
V
1
1.15
V
1
1.2
V
1
1.25
V
1
1.3
V
1
1.15
V
4
4.2
V
7
7.3
V
10
10.4
V
1
1.15
V
5
5.3
V
9
9.5
V
13
13.7
V
1.24
1.35
V
10
mV
2.7
3.2
µA
10
100
nA
195
220
Hz
500
550
Hz
1090
1250
Hz
Rev. B
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