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参数资料
| 型号： | LTC3215EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/14页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT 10-DFN |
| 标准包装： | 121 |
| 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： | 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： | 管件 |
| 工作温度： | -40°C ~ 85°C |
| 产品目录页面： | 1339 (CN2011-ZH PDF) |
LTC3215
APPLICATIONS INFORMATION
when comparing different capacitors, it is often more ap-
propriate to compare the amount of achievable capacitance
for a given case size rather than comparing the specified
capacitance value. For example, over rated voltage and
temperature conditions, a 1μF, 10V, Y5V ceramic capaci-
tor in a 0603 case may not provide any more capacitance
than a 0.22μF, 10V, X7R available in the same case. The
capacitor manufacturer’s data sheet should be consulted
to determine what value of capacitor is needed to ensure
minimum capacitances at all temperatures and voltages.
Table 2 shows a list of ceramic capacitor manufacturers
and how to contact them.
Table 2. Recommended Capacito r Vendors
AVX www.avxcorp.com
Kemet www.kemet.com
Murata www.murata.com
The flying capacitor pins C1 + , C2 + , C1 – and C2 – will have
very high edge rate waveforms. The large dv/dt on these
pins can couple energy capacitively to adjacent PCB runs.
Magnetic fields can also be generated if the flying capacitors
are not close to the LTC3215 (i.e., the loop area is large).
To decouple capacitive energy transfer, a Faraday shield
may be used. This is a grounded PCB trace between the
sensitive node and the LTC3215 pins. For a high quality
AC ground, it should be returned to a solid ground plane
that extends all the way to the LTC3215.
The following guidelines should be followed when design-
ing a PCB layout for the LTC3215.
? The Exposed Pad should be soldered to a large copper
plane that is connected to a solid, low impedance ground
plane using plated, through-hole vias for proper heat
sinking and noise protection.
Taiyo Yuden
Vishay
www.t-yuden.com
www.vishay.com
? Input and output capacitors (C IN and C CPO ) must also
be placed as close to the part as possible.
TDK www.tdk.com
Layout Considerations and Noise
Due to its high switching frequency and the transient
currents produced by the LTC3215, careful board layout
is necessary. A true ground plane and short connections
to all capacitors will improve performance and ensure
proper regulation under all conditions. An example of
such a layout is shown in Figure 4.
C1
? The flying capacitors must also be placed as close to
the part as possible. The traces running from the pins
to the capacitor pads should be as wide as possible.
? V IN , CPO and I LED traces must be made as wide as
possible. This is necessary to minimize inductance,
as well as provide sufficient area for high current ap-
plications.
? LED pads must be large and should be connected to
as much solid metal as possible to ensure proper heat
sinking.
Power Efficiency
C CPO
PIN 1
C2
C IN
3215 F04
To calculate the power efficiency ( η ) of a white LED
driver chip, the LED power should be compared to the
input power. The difference between these two numbers
represents lost power whether it is in the charge pump
or the current sources. Stated mathematically, the power
efficiency is given by:
P LED
η≡
P IN
(4)
Figure 4. Example Board Layout
3215fc
10
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相关代理商/技术参数 |
参数描述 |
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| 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 |
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