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| 型号： | LT3755EUD-2#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/26页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR HP CONST CURR 16-QFN |
| 标准包装： | 121 |
| 恒定电流： | 是 |
| 恒定电压： | 是 |
| 拓扑： | 回扫，低端，PWM，SEPIC，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 车载 |
| 类型 - 次要： | 白色 LED |
| 频率： | 100kHz ~ 1MHz |
| 电源电压： | 4.5 V ~ 40 V |
| 输出电压： | 75V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（3x3） |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 125°C |
| 产品目录页面： | 1340 (CN2011-ZH PDF) |
LT3755/LT3755-1/LT3755-2
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T A = 25°C. V IN = 24V, SHDN /UVLO = 24V, CTRL = 2V, PWM = 5V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Linear Regulator
INTV CC Regulation Voltage
Dropout (V IN – INTV CC )
INTV CC Undervoltage Lockout
INTV CC Current Limit
INTV CC Current in Shutdown
I INTVCC = –10mA, V IN = 7V
SHDN /UVLO = 0V, INTV CC = 7V
7
3.9
29
7.15
350
4.1
34
8
7.3
4.3
40
12
V
mV
V
mA
μA
Logic Inputs/Outputs
PWM Input High Voltage
PWM Input Low Voltage
l
l
1.5
0.4
V
V
PWM Pin Resistance to GND
45
60
kΩ
PWMOUT Output Low (V OL )
PWMOUT Output High (V OH )
INTV CC –
0.05
0
50
mV
V
SHDN /UVLO Threshold Voltage Falling
E-, I-Grades
H-Grade
l
l
1.185
1.175
1.220
1.245
1.245
V
V
SHDN /UVLO Rising Hysteresis
20
mV
SHDN /UVLO Input Low Voltage
I VIN Drops Below 1μA
0.4
V
SHDN /UVLO Pin Bias Current Low
SHDN /UVLO Pin Bias Current High
SHDN /UVLO = 1.15V
SHDN /UVLO = 1.30V
1.7
2.05
10
2.5
100
μA
nA
OPENLED Output Low (V OL )
SYNC Pin Resistance to GND
SYNC Input High
SYNC Input Low
I OPENLED = 0.5mA (LT3755 and LT3755-2)
LT3755-1 Only
LT3755-1 Only
LT3755-1 Only
1.5
30
200
0.4
mV
kΩ
V
V
Gate Driver
t r GATE Driver Output Rise Time
t f GATE Driver Output Fall Time
GATE Output Low (V OL )
GATE Output High (V OH )
C L = 3300pF
C L = 3300pF
INTV CC –
0.05
35
35
0.05
ns
ns
V
V
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT3755E, LT3755E-1 and LT3755E-2 are guaranteed to meet
performance specifications from 0°C to 125°C junction temperature.
Specifications over the –40°C to 125°C operating junction temperature
range are assured by design, characterization and correlation with
statistical process controls. The LT3755I, LT3755I-1 and LT3755I-2 are
guaranteed to meet performance specifications over the –40°C to 125°C
operating junction temperature range. The LT3755H-2 is guaranteed to
meet performance specifications over the full –40°C to 150°C operating
junction temperature range. High junction temperatures degrade operating
lifetimes. Operating lifetime is derated at junction temperatures greater
than 125°C.
Note 3: For V IN below 6V, the SHDN /UVLO pin must not exceed V IN for
proper operation.
Note 4: GATE and PWMOUT pins are driven either to GND or INTV CC by
internal switches. Do not connect these pins externally to a power supply.
Note 5: The LT3755 includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum operating junction temperature
when overtemperature protection is active. Continuous operating above
the specified maximum operating junction temperature may impair device
reliability.
37551fd
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