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LT3492EUFD#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
LT3492
1
3492fa
FEATURES
APPLICATIONS
DESCRIPTION
Triple Output LED Driver
with 3000:1 PWM Dimming
The LT
®
3492 is a triple output DC/DC converter designed
to operate as a constant-current source and is ideal for
driving LEDs. The LT3492 works in buck, boost or buck-
boost mode. The LT3492 uses a fi xed frequency, current
mode architecture resulting in stable operation over a
wide range of supply and output voltages. A frequency
adjust pin allows the user to program switching frequency
between 330kHz and 2.1MHz to optimize effi ciency and
external component size.
The external PWM input provides 3000:1 LED dimming
on each channel. Each of the three channels has a built-in
gate driver to drive an external LED-disconnect P-channel
MOSFET, allowing high dimming range. The output current
range of each channel of the LT3492 is programmed with
an external sense resistor.
The CTRL pin is used to adjust the LED current either for
analog dimming or overtemperature protection.
n
True Color PWM™ Dimming Delivers Up to 3000:1
Dimming Ratio
n
Built-In Gate Driver for PMOS LED Disconnect
n
Three Independent Driver Channels with 600mA,
60V Internal Switches
n
Operates in Buck, Boost, Buck-Boost Modes
n
CTRL Pin Accurately Sets LED Current Sense
Threshold Over a Range of 10mV to 100mV
n
Adjustable Frequency: 330kHz to 2.1MHz
n
Open LED Protection
n
Wide Input Voltage Range:
Operation from 3V to 30V
Transient Protection to 40V
n
Surface Mount Components
n
28-Lead (4mm × 5mm) QFN and TSSOP Packages
n
RGB Lighting
n
Billboards and Large Displays
n
Automotive and Avionic Lighting
n
Constant-Current Sources
High Dimming Ratio Triple Output Buck-Mode LED Power Supply
3000:1 PWM Dimming at 100Hz
TYPICAL APPLICATION
0.3A
0.47µF
0.47µF
ISN1
330m 330m
TG1
PV
IN
58V
10 LEDs
33µH
ISP1
0.3A
ISN2
TG2
33µH
ISP2
0.3A
0.47µF
ISN3
1µF
s3
330m
10k
150k
49.9k
680pF
3492 TA01a
TG3
33µH
ISP3
SW1 SW2
LT3492
GND
SW3 TG1-3
V
C1-3
V
REF
CTRL1-3
ISP1-3
ISN1-3
V
IN
PWM1-3
SHDN
V
IN
3V TO 24V
1µF
FADJ
OVP1-3
1.3MHz
L, LT, LTC, 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, and others pending.
PWM
5V/DIV
1µs/DIV
3492 TA01b
I
LED
0.2A/DIV
I
L
0.5A/DIV
LT3492
2
3492fa
ABSOLUTE MAXIMUM RATINGS
V
IN
(Note 4) ...............................................................40V
SW1-SW3, ISN1-ISN3, ISP1-ISP3 ............................60V
TG1-TG3 ...............................................ISP – 10V to ISP
PWM1-PWM3 ...........................................................20V
V
REF
, CTRL1-CTRL3, FADJ, V
C1
-V
C3
, OVP1-OVP3 ....2.5V
SHDN (Note 4) ...........................................................V
IN
(Note 1)
PIN CONFIGURATION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
FE PACKAGE
28-LEAD PLASTIC TSSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
SHDN
PWM3
PWM2
PWM1
V
REF
CTRL3
CTRL2
CTRL1
FADJ
V
C3
V
C2
V
C1
OVP3
OVP2
V
IN
TG3
ISN3
ISP3
SW3
SW2
ISP2
ISN2
TG2
SW1
ISP1
ISN1
TG1
OVP1
GND
29
T
JMAX
= 125°C, θ
JA
= 30°C/W, θ
JC
= 10°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
9 10
TOP VIEW
GND
29
UFD PACKAGE
28-LEAD (4mm s 5mm) PLASTIC QFN
11 12 13
28 27 26 25 24
14
23
6
5
4
3
2
1
PWM1
V
REF
CTRL3
CTRL2
CTRL1
FADJ
V
C3
V
C2
ISP3
SW3
SW2
ISP2
ISN2
TG2
SW1
ISP1
PWM2
PWM3
SHDN
V
IN
TG3
ISN3
V
C1
OVP3
OVP2
OVP1
TG1
ISN1
7
17
18
19
20
21
22
16
8
15
T
JMAX
= 125°C, θ
JA
= 34°C/W, θ
JC
= 2.7°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3492EFE#PBF LT3492EFE#TRPBF LT3492FE 28-Lead Plastic TSSOP –40°C to 125°C
LT3492IFE#PBF LT3492IFE#TRPBF LT3492FE 28-Lead Plastic TSSOP –40°C to 125°C
LT3492EUFD#PBF LT3492EUFD#TRPBF 3492
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LT3492IUFD#PBF LT3492IUFD#TRPBF 3492
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
*For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/
ORDER INFORMATION
Operating Junction Temperature Range
(Note 2) .................................................. –40°C to 125°C
Max Junction Temperature .................................... 125°C
Storage Temperature Range
TSSOP ............................................... –65°C to 150°C
UFD .................................................... –65°C to 125°C
LT3492
3
3492fa
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 5V, SHDN = 5V, PWM1-3 = 5V, FADJ = 0.5V, CTRL1-3 = 1.5V,
OVP1-3 = 0V, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operation Voltage (Note 4) 3 30 V
V
IN
Undervoltage Lockout 2.1 2.4 V
Full-Scale LED Current Sense Voltage ISP1-3 = 48V
l
98
96
100 103
104
mV
mV
One-Tenth Scale LED Current Sense Voltage CTRL1-3 = 100mV, ISP1-3 = 48V 7 10 13 mV
ISPn/ISNn Operating Voltage 2.5 60 V
V
REF
Output Voltage I
REF
= 200µA, Current Out of Pin
l
1.96 2 2.04 V
V
REF
Line Regulation 3V ≤ V
IN
≤ 40V, I
REF
= 10µA 0.03 %/V
Quiescent Current in Shutdown SHDN = 0V 0.1 10 µA
Quiescent Current Idle PWM1-PWM3 = 0V 6 8 mA
Quiescent Current Active (Not Switching) V
C1
-V
C3
= 0V 11 15 mA
Switching Frequency FADJ = 1.5V
FADJ = 0.5V
FADJ = 0.1V
1800
1000
280
2100
1300
340
2400
1600
400
kHz
kHz
kHz
Maximum Duty Cycle FADJ = 1.5V (2.1MHz)
FADJ = 0.5V (1.3MHz)
FADJ = 0.1V (330kHz)
73
80
78
87
97
%
%
%
CTRL1-3 Input Bias Current Current Out of Pin, CTRL1-3 = 0.1V 20 100 nA
FADJ Input Bias Current Current Out of Pin, FADJ = 0.1V 20 100 nA
OVP1-3 Input Bias Current Current Out of Pin, OVP1-3 = 0.1V 10 100 nA
OVP1-3 Threshold 0.95 1 1.05 V
V
C1-3
Idle Input Bias Current PWM1-3 = 0V –20 0 20 nA
V
C1-3
Output Impedance ISP1-3 = 48V 10 MΩ
EAMP g
m
(ΔI
VC
/ΔV
CAP-LED
)
ISP1-3 = 48V 200 µS
SW1-3 Current Limit (Note 3) 600 1000 1300 mA
SW1-3 V
CESAT
I
SW
= 500mA (Note 3) 340 mV
SW1-3 Leakage Current SHDN = 0V, SW = 5V 2 µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22

LT3492EUFD#TRPBF

Mfr. #:
Buy LT3492EUFD#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LED Lighting Drivers High Current, 60V, 2.1MHz Triple Output LED Driver in 4x5 QFN
Lifecycle:
New from this manufacturer.
Delivery:
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