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| 型号： | MIC2845A-MFYMT TR |
| 厂商： | Micrel Inc |
| 文件页数： | 10/18页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT 14TMLF |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | 线性（LDO），PWM |
| 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 |
| 频率： | 500kHz |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-UFQFN 裸露焊盘，14-TMLF? |
| 供应商设备封装： | 14-TMLF?（2.5x2.5） |
| 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： | 576-3474-6 |
Micrel Inc.
Functional Diagram
EN2 EN1
MIC2845A
VIN
EN
VIN
V-to-I
TSD
OUT
LDO1
D1...D6
BG
1.27V
V REF
GND
6
EN
VIN
END
PWM
CONTROL
TSD
OUT
LDO2
POR
V REF
TSD
OSC
GND
RSET
GND
Figure 1. MIC2845A Functional Block Diagram
Functional Description
The MIC2845A is a six channel linear LED driver with
dual 150mA LDOs. The LED driver is designed to
maintain proper current regulation with LED current
accuracy of 1.5% while the typical matching between the
six channels is 1.5% at room temperature. The LED
currents are independently driven from the input supply
and will maintain regulation with a dropout of 40mV at
20mA. The low dropout of the linear drivers allows the
LEDs to be driven directly from the battery voltage and
eliminates the need for boost or large and inefficient
charge pumps. The maximum LED current for each
channel is set via an external resistor. Dimming is
controlled by applying a PWM signal to the END pin. The
MIC2845A accommodates a wide PWM frequency range
as outlined in the application information section.
The MIC2845A has two LDOs with a dropout voltage of
150mV at 150mA and consume 35μA of current in
operation. Each LDO has an independent enable pin,
which reduces the operating current to less than 1μA in
shutdown. Both linear regulators are stable with just 1μF
of output capacitance.
Block Diagram
As shown in Figure 1, the MIC2845A consists of two
LDOs with six current mirrors set to copy a master
current determined by R SET . The linear LED drivers have
a designated control block for enabling and dimming of
the LEDs. The MIC2845A dimming is controlled by the
Ultra Fast PWM TM control block that receives PWM
signals for dimming. The LDOs each have their own
control and are independent of the linear LED drivers.
Each LDO consists of internal feedback resistors, an
error amplifier, a PFET transistor and a control circuit for
enabling.
April 2010
10
M9999-041210-C
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| 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 |
| MIC2845A-PGYMT-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-PPYMT 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 |
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