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参数资料
| 型号： | LT3519IMS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC LED DRV HP CONST CURR 16MSOP |
| 标准包装： | 2,500 |
| 恒定电流： | 是 |
| 恒定电压： | 是 |
| 拓扑： | PWM，SEPIC，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载 |
| 频率： | 320kHz ~ 440kHz |
| 电源电压： | 3 V ~ 30 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TFSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 16-MSOP |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
LT3519/LT3519-1/LT3519-2
LED Driver with Integrated
Schottky Diode
FEATURES
DESCRIPTION
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Up to 3000:1 True Color PWM? Dimming
Wide Input Voltage Range
Operation from 3V to 30V
Transient Protection to 40V
Rail-to-Rail LED Current Sense from 0V to 45V
45V, 750mA Internal Switch
Internal Schottky Diode
Constant-Current and Constant-Voltage Regulation
Boost, SEPIC, Buck-Boost Mode or Buck Mode
Topology
Open LED Protection and Open LED Status Pin
Programmable Undervoltage Lockout with Hysteresis
Fixed Frequency: 400kHz (LT3519), 1MHz (LT3519-1),
2.2MHz (LT3519-2)
Internal Compensation
CTRL Pin Provides Analog Dimming
Low Shutdown Current: <1μA
16-Lead MSOP Package
The LT ? 3519/LT3519-1/LT3519-2 are ?xed frequency
step-up DC/DC converters designed to drive LEDs. They
feature an internal 45V, 750mA low side switch and Schottky
diode. Combining a traditional voltage feedback and a
unique rail-to-rail current sense feedback allows these
converters to operate as a constant-voltage source or
constant-current source. Internal compensation simpli?es
applications. These devices feature rail-to-rail LED current
sense pins that provide the most ?exibility in choosing a
converter con?guration to drive the LEDs. The LED cur-
rent is externally programmable with a sense resistor. The
external PWM provides up to 3000:1 PWM dimming and
the CTRL input provides analog dimming.
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 and 7321203.
APPLICATIONS
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Automotive
Industrial
Constant Current Source
Current Limited Constant Voltage Source
TYPICAL APPLICATION
4W Boost Automotive LED Driver
LED Current vs V IN
V IN
6V TO 30V
1μF
68μH
SW ANODE CATHODE
V OUT
4.7μF
120
100
V IN = 6V AND ABOVE
1M
V IN
ISP
2.49Ω
80
100k
SHDN /UVLO
ISN
60
1M
137k
243k
V REF
CTRL
LT3519
FB
1M
29.4k
38V LED
100mA
40
20
OPENLED
0
GND
PWM
0
10
20
30
PWM
M1
3519 TA01a
V IN (V)
3519 TA01b
3519fa
1
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