- 您现在的位置：买卖IC网 > PDF目录20886 > LTC3215EDD#TR (Linear Technology)IC LED DRIVR WHITE BCKLGT 10-DFN PDF资料下载
参数资料
| 型号： | LTC3215EDD#TR |
| 厂商： | Linear Technology |
| 文件页数： | 11/14页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT 10-DFN |
| 标准包装： | 2,500 |
| 拓扑： | PWM，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： | 背光，闪灯/白光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 600kHz ~ 1.2MHz |
| 电源电压： | 2.9 V ~ 4.4 V |
| 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（3x3） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
LTC3215
APPLICATIONS INFORMATION
= LED LED ≈ LED
P IN
V IN ? 2 ? I LED
2 ? V IN
= LED LED ≈ LED
P LED V ? I V
P IN
V IN ? I IN
V IN
TheefficiencyoftheLTC3215dependsuponthemodein
which it is operating. Recall that the LTC3215 operates
as a pass switch, connecting V IN to CPO, until dropout
is detected at the I LED pin. This feature provides the op-
timum efficiency available for a given input voltage and
LED forward voltage. When it is operating as a switch, the
efficiency is approximated by:
η≡
(5)
since the input current will be very close to the LED current.
At moderate to high output power, the quiescent current of
the LTC3215 is negligible and the expression above is valid.
Once dropout is detected at the I LED pin, the LTC3215
enables the charge pump in 1.5x mode.
In 1.5x boost mode, the efficiency is similar to that of a
linear regulator with an effective input voltage of 1.5 times
the actual input voltage. This is because the input current
for a 1.5x charge pump is approximately 1.5 times the
load current. In an ideal 1.5x charge pump, the power
efficiency would be given by:
Similarly, in 2x boost mode, the efficiency is similar to
that of a linear regulator with an effective input voltage
of 2 times the actual input voltage. In an ideal 2x charge
pump, the power efficiency would be given by:
P LED V ? I V
η IDEAL ≡
(7)
Thermal Management
For higher input voltages and maximum output current,
there can be substantial power dissipation in the LTC3215.
If the junction temperature increases above approximately
150°C, the thermal shutdown circuitry will automatically
deactivate the output. To reduce maximum junction tem-
perature, a good thermal connection to the PC board is
recommended. Connecting the Exposed Pad to a ground
plane and maintaining a solid ground plane under the
device can reduce the thermal resistance of the package
and PC board considerably.
η IDEAL ≡
P LED
P IN
=
V LED ? I LED
V IN ? 1.5I LED
≈
V LED
1.5V IN
(6)
3215fc
11
相关PDF资料 |
PDF描述 |
|---|---|
| P51-1500-S-R-I36-20MA-000-000 | SENSOR 1500PSIS M12 4-20 MA |
| REC3-0505SRW/H4/A/CTRL | CONV DC/DC 3W 4.5-9VIN 05VOUT |
| LTC3215EDD | IC LED DRIVR WHITE BCKLGT 10-DFN |
| LTC3210EUD-1#TRPBF | IC LED DRIVR WHITE BCKLGT 16-QFN |
| P51-200-S-R-D-4.5V-000-000 | SENSOR 200PSI M12-1.0 6G .5-4.5V |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3216 | 制造商:LINER 制造商全称:Linear Technology 功能描述:700mA Low Noise High Current LED Charge Pump |
| LTC3216EDE | 制造商:Linear Technology 功能描述:LED DRVR 1Segment 3.3V 12-Pin DFN EP |
| LTC3216EDE#PBF | 功能描述:IC CHARGE PUMP LED 12-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3216EDE#TRPBF | 功能描述:IC CHARGE PUMP LED 12-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3217 | 制造商:LINER 制造商全称:Linear Technology 功能描述:600mA Low Noise Multi-LED Camera Light Charge Pump |
发布紧急采购，3分钟左右您将得到回复。