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| 型号： | MIC2842AYMT 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 |
| 拓扑： | 线性（LDO） |
| 输出数： | 4 |
| 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： | 576-3472-6 |
Micrel Inc.
Functional Description
The MIC2842A is a four 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 four 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 MIC2842A is
controlled by a single-wire digital interface.
Block Diagram
As shown in Figure 1, the MIC2842A consists of 4
current mirrors set to copy a master current determined
by R SET . The linear drivers have a designated control
block for enabling and dimming of the WLEDs. The
MIC2842A dimming is controlled by an internal Digital
Control Interface.
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 MIC2842A. See the MIC2842A
Digital Dimming Interface in the Application Information
section for details. Pulling the DC pin low for more than
1260 μ s puts the MIC2842A 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.
MIC2842A
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-D4
The D1 through D4 pins are the linear driver inputs for
WLED 1 through 4, respectively. When operating with
less than four 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 D4 leaving D3 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
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