- 您现在的位置：买卖IC网 > Datasheet目录343 > MIC2844AYMT TR (Micrel Inc)IC LED DRIVR WHITE BCKLGT 10TMLF Datasheet资料下载
参数资料
| 型号： | MIC2844AYMT TR |
| 厂商： | Micrel Inc |
| 文件页数： | 7/14页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT 10TMLF |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | 线性（LDO） |
| 输出数： | 6 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，闪灯/白光 |
| 类型 - 次要： | 白色 LED |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-UFDFN 裸露焊盘，10-TMLF? |
| 供应商设备封装： | 10-TMLF?（2x2） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 产品目录页面： | 1082 (CN2011-ZH PDF) |
| 其它名称： | 576-3473-6 |
Micrel Inc.
Functional Description
The MIC2844A is a six channel linear WLED driver. The
WLED driver is designed to maintain proper current
regulation with LED current accuracy of 1.5%, and
typical matching of 1.5% across the six channels. The
WLEDs are driven independently from the input supply
and will maintain regulation with a dropout of 40mV at
20mA. The low dropout allows the WLEDs to be driven
directly from the battery voltage and eliminates the need
for large and inefficient charge pumps. The maximum
WLED current for each channel is set via an external
R SET resistor. If dimming is desired the MIC2844A is
controlled by a single-wire digital interface.
Block Diagram
As shown in Figure 1, the MIC2844A consists of six
current mirrors set to copy a master current determined
by the R SET resistor. The linear drivers have a
designated control block for enabling and dimming of the
WLEDs.
V IN
The input supply (V IN ) provides power to the linear
drivers and the control circuitry. The V IN operating range
is 3V to 5.5V. A bypass capacitor of 1μF should be
placed close to input (VIN) pin and the ground (GND)
pin. Refer to the layout recommendations section for
details on placing the input capacitor (C1).
DC
The DC pin is used to enable and control dimming of the
linear drivers on the MIC2844A. See the MIC2844A
Digital Dimming Interface in the Application Information
section for details. Pulling the DC pin low for more than
1260 μ s puts the MIC2844A into a low Iq sleep mode.
The DC pin cannot be left floating; a floating enable pin may
cause an indeterminate state on the outputs. A 200k ? pull
down resistor is recommended.
MIC2844A
R SET
The R SET pin is used by connecting a R SET resistor to
ground to set the peak current of the linear LED drivers.
The average LED current can be calculated by the
equation (1) below.
I LED (mA) = 410 * ADC / R SET (k ? ) (1)
ADC is the average duty cycle of the LED current
controlled by the single-wire digital dimming. See Table
1 for ADC values. When the device is fully on the
average duty cycle equals 100% (ADC=1). A plot of I LED
versus R SET at 100% duty cycle is shown in Figure 2.
Figure 2. Peak LED Current vs. R SET
D1-D6
The D1 through D6 pins are the linear driver for WLED 1
through 6, respectively. When operating with less than
six WLEDs, leave the unused D pins unconnected. The
linear drivers are extremely versatile in that they may be
used in any combination, for example D1 thru D6 leaving
D5 unconnected or paralleled for higher current
applications.
GND
The ground pin is the ground path for the linear drivers.
The current loop for the ground should be as small as
possible. The ground of the input capacitor should be
routed with low impedance traces to the GND pin and
made as short as possible. Refer to the layout
recommendations for more details.
August 2009
7
M9999-080309-D
相关PDF资料 |
PDF描述 |
|---|---|
| MIC2845A-MFYMT TR | IC LED DRIVR WHITE BCKLGT 14TMLF |
| MIC2846A-MFYMT TR | IC LED DRIVR WHITE BCKLGT 14TMLF |
| MIC2981/82YWM TR | IC SOURCE DRIVER ARRAY HC 18SOIC |
| MIC2981/82YWM | IC DRIVER ARRAY HV/HC 8CH 18SOIC |
| MIC3201YME | IC LED DRIVER 8ESOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2845A-MFYMT TR | 功能描述:LED照明驱动器 6 Channel Linear WLED Driver + 2 LDOs with PWM Control RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MIC2845A-MFYMT-TR | 功能描述:LED 驱动器 IC 6 输出 线性 PWM 调光 20mA 14-TMLF?（2.5x2.5） 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:过期 类型:线性 拓扑:- 内部开关:是 输出数:6 电压 - 供电（最低）:3V 电压 -?供电（最高）:5.5V 电压 - 输出:- 电流 - 输出/通道:20mA 频率:- 调光:PWM 应用:背光，照相机闪光灯 工作温度:-40°C ~ 150°C（TJ） 安装类型:表面贴装 封装/外壳:14-UFQFN 裸露焊盘，14-TMLF? 供应商器件封装:14-TMLF?（2.5x2.5） 标准包装:1 |
| MIC2845A-MGYMT TR | 功能描述:LED照明驱动器 6 Channel Linear WLED Driver + 2 LDOs with PWM Control RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MIC2845A-MGYMT-TR | 功能描述:LED 驱动器 IC 6 输出 线性 PWM 调光 20mA 14-TMLF?（2.5x2.5） 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:过期 类型:线性 拓扑:- 内部开关:是 输出数:6 电压 - 供电（最低）:3V 电压 -?供电（最高）:5.5V 电压 - 输出:- 电流 - 输出/通道:20mA 频率:- 调光:PWM 应用:背光，照相机闪光灯 工作温度:-40°C ~ 150°C（TJ） 安装类型:表面贴装 封装/外壳:14-UFQFN 裸露焊盘，14-TMLF? 供应商器件封装:14-TMLF?（2.5x2.5） 标准包装:1 |
| MIC2845A-PGYMT TR | 功能描述:LED照明驱动器 6 Channel Linear WLED Driver + 2 LDOs with PWM Control RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
发布紧急采购，3分钟左右您将得到回复。