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参数资料
| 型号： | LTC3218EDDB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR FLASH TORCH 10DFN |
| 标准包装： | 500 |
| 拓扑： | 升压（升压），切换式电容器（充电泵） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 闪灯/白光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1MHz |
| 电源电压： | 2.9 V ~ 4.5 V |
| 输出电压： | 5.3V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN-EP（3x2） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
LTC3218
BLOCK DIAGRAM
OSCILLATOR
CP
1
+
CM
9
VOLTAGE
CLAMP
106Ω
220mΩ
2 CPO
MODE
–
3 I LED
V IN 10
ENT 4
ENF 7
CONTROL
LOGIC
CONTROL
V REF
CURRENT
SOURCE
CONTROL
I SETT
I SETF
GND
GND
5
6
8
11
3218 BD
OPERATION
The LTC3218 uses a switched capacitor charge pump to
power a high current LED with a programmed regulated
current. Current regulation is achieved using an internal
current sense resistor connected between the CPO and
I LED pins. The part starts up in 1x mode after a soft-start
period. In this mode, V IN is connected to the CPO through
switches, the strengths of which are modulated to achieve
the desired LED current. This mode provides maximum
ef?ciency and minimum noise. The LTC3218 will remain in
this mode until the LED forward voltage (V F ) approaches
the maximum CPO voltage possible in this mode. When
this dropout condition occurs, the LTC3218 will switch to
2x mode after a soft-start period.
The current delivered to the LED load is controlled by the
internal programmable current source. The current is
programmed by resistors connected between the I SETT
and I SETF pins and GND. The resistor values needed to
3218fb
6
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相关代理商/技术参数 |
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| LTC3218EDDBTRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:400mA Single Wire Camera LED Charge Pump |
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| LTC3219EUD#PBF | 功能描述:IC LED DRIVR QVGA DISPLAY 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:60 系列:- 恒定电流:- 恒定电压:- 拓扑:线性（LDO），PWM，升压（升压） 输出数:8 内部驱动器:是 类型 - 主要:背光 类型 - 次要:RGB，白色 LED 频率:500kHz ~ 1.5MHz 电源电压:4.75 V ~ 26 V 输出电压:45V 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* 工作温度:-40°C ~ 85°C |
| LTC3219EUD#TRPBF | 功能描述:IC LED DRIVR QVGA DISPLAY 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| LTC3219EUD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:250mA Universal Nine Channel LED Driver |
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