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Linear Technology Electronic Components Datasheet

LT3592 Datasheet

500mA Wide Input Voltage Range Step-Down LED Driver

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LT3592
FEATURES
500mA Wide Input Voltage
Range Step-Down LED Driver
with 10:1 Dimming
DESCRIPTION
n Wide Input Voltage Range
Operation from 3.6V to 36V
n Resistor Adjustable 400kHz–2.2MHz Switching
Frequency
n Shorted and Open LED Protected
n Internal Switch Current Sense Resistor
n External Resistor Programs LED Current, Pin
Selects 10:1 Ratio
n 50mA/500mA LED Current Settings
n Catch Diode Current Sense to Prevent Runaway at
High VIN
n Small Thermally Enhanced 10-Lead DFN
(2mm × 3mm) and MSOP-10 Packages
APPLICATIONS
n Automotive Signal Lighting
n Industrial Lighting
n Constant-Current, Constant Voltage Supplies
The LT®3592 is a fixed frequency step-down DC/DC con-
verter designed to operate as a constant-current source.
An external sense resistor monitors the output current
allowing accurate current regulation, ideal for driving
high current LEDs. The output current can be dimmed
by a factor of 10 using an external signal for nighttime
brake lights.
The high switching frequency offers several advantages by
permitting the use of a small inductor and small ceramic
capacitors. Small components combined with the LT3592’s
10-pin DFN leadless surface mount package save space and
cost versus alternative solutions. The constant switching
frequency combined with low-impedance ceramic capaci-
tors result in low, predictable output ripple.
A wide input voltage range of 3.6V to 36V makes the
LT3592 useful in a variety of applications. Current mode
PWM architecture provides fast transient response and
cycle-by-cycle current limiting. Thermal shutdown provides
additional protection.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
50/500mA Two Series Red LED Driver
VIN
7V TO 32V
VIN BOOST
1μF LT3592
SW
0.1μF 10μH
ON
BRAKE
140k
900kHz
SHDN
DA
CAP
BRIGHT OUT
RT
GND VFB
+
200/20mV
51k
10k
0.4Ω
4.7μF
3592 TA01a
Efficiency for 2 Red LEDs, L = 10μH, 900kHz
100
95
90
85
80
75
70
65
60
55
50
4
BRIGHT 500mA
8 12 16 20 24 28
INPUT VOLTAGE (V)
3592 TA01b
3592fa
1


Linear Technology Electronic Components Datasheet

LT3592 Datasheet

500mA Wide Input Voltage Range Step-Down LED Driver

No Preview Available !

LT3592www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS (Note 1)
VIN, BRIGHT Voltages ................................ –0.3V to 36V
BOOST Voltage .........................................................60V
BOOST above SW pin ...............................................30V
CAP, OUT Voltages (OUT ≤ CAP) ...............................30V
VFB Voltage .................................................................4V
RT Voltage...................................................................6V
SHDN Voltage ............................................................VIN
DA Pin Current (Average)..................... –1.2A (sourcing)
Operating Temperature Range (Notes 2, 3)
LT3592E............................................. –40°C to 125°C
LT3592I.............................................. –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
RT
BRIGHT
SHDN
VIN
DA
1
2
3
4
5
10 VFB
9 OUT
11 8 CAP
7 BOOST
6 SW
DDB PACKAGE
10-LEAD (3mm s 2mm) PLASTIC DFN
θJA = 76°C/W, θJC = 13.5°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
RT 1
BRIGHT 2
SHDN 3
VIN 4
DA 5
TOP VIEW
11
10 VFB
9 OUT
8 CAP
7 BOOST
6 SW
MSE PACKAGE
10-LEAD PLASTIC MSOP
θJA = 38°C/W, θJC = 8°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3592EDDB#PBF
LT3592EDDB#TRPBF LDCQ
10-Lead (3mm × 2mm) Plastic DFN
–40°C to 125°C
LT3592IDDB#PBF
LT3592IDDB#TRPBF
LDCQ
10-Lead (3mm × 2mm) Plastic DFN
–40°C to 125°C
LT3592EMSE#PBF
LT3592EMSE#TRPBF LTDCR
10-Lead Plastic MSOP
–40°C to 125°C
LT3592IMSE#PBF
LT3592IMSE#TRPBF
LTDCR
10-Lead Plastic MSOP
–40°C to 125°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3592EDDB
LT3592EDDB#TR
LDCQ
10-Lead (3mm × 2mm) Plastic DFN
–40°C to 125°C
LT3592IDDB
LT3592IDDB#TR
LDCQ
10-Lead (3mm × 2mm) Plastic DFN
–40°C to 125°C
LT3592EMSE
LT3592EMSE#TR
LTDCR
10-Lead Plastic MSOP
–40°C to 125°C
LT3592IMSE
LT3592IMSE#TR
LTDCR
10-Lead Plastic MSOP
–40°C to 125°C
Consult LTC 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/
3592fa
2


Part Number LT3592
Description 500mA Wide Input Voltage Range Step-Down LED Driver
Maker Linear Technology
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LT3592 Datasheet PDF






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