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参数资料
| 型号： | MIC2291BD5 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 1/10页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER PHOTO FLASH TSOT-5 |
| 标准包装： | 3,000 |
| 拓扑： | PWM，升压（升压） |
| 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： | 1.05MHz ~ 1.35MHz |
| 电源电压： | 2.5 V ~ 10 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-5 细型，TSOT-23-5 |
| 供应商设备封装： | TSOT-23-5 |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | MIC2291BD5TR |
MIC2291
1.2A PWM Boost Regulator Photo Flash
LED Driver
General Description
Features
The MIC2291 is a 1.2MHz Pulse Width Modulation (PWM),
boost-switching regulator that is optimized for high-current,
white LED photo ? ash applications. With a guaranteed
switch current of 1.2A, the MIC2291 easily drives a string
of 3 white LEDs in series at 100mA, ensuring a high level
of brightness and eliminating several ballast resistors.
The MIC2291 implements a constant frequency, 1.2MHz
PWM control scheme. The high frequency PWM operation
saves board space by reducing external component sizes.
The added bene ? t of the constant frequency PWM
scheme, in contrast to variable frequency topologies, is
much lower noise and input ripple injected back to the
battery source.
To optimize efficiency, the feedback voltage is set to only
95mV. This reduces the power dissipation in the current
set resistor, and allows the lowest total output voltage,
hence minimal current draw from the battery.
The MIC2291 is available with 2 levels of over-voltage
protection, 15V, and 34V. This allows designers to choose
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2.5V to 10V input voltage
Output voltage up to 34V
1.2A switch current
1.2MHz PWM operation
95mV feedback voltage
Overvoltage protection (OVP)
– Options for 15V and 34V
Stable with ceramic capacitors
<1% line and load regulation
1μA shutdown current
Over temperature protection
UVLO
Low-pro ? le Thin SOT23-5 package option
2mm × 2mm MLF ? package option
–40°C to +125°C junction temperature range
the smallest possible external components with the
appropriate voltage ratings for their applications.
The MIC2291 is available in low-pro ? le, Thin SOT23 5-pin
and 8-pin 2mm × 2mm MLF ? package options. The
MIC2291 has a junction temperature range of –40°C to
+125°C.
Applications
? Photo Flash LED driver
? Cell phones
? PDAs
? GPS systems
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Typical Application
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Digital cameras
IP phones
LED ? ashlights
10μH
MIC2291xD5
100mA
10μH
MIC2291-15xML
100mA
1-Cell
Li Ion
3V to 4.2V
1μF
5
4
VIN
EN
SW
FB
GND
1
3
95mV
0.22μF
ceramic
1-Cell
Li Ion
3V to 4.2V
1μF
VIN
EN
SW
OVP
FB
GND
95mV
0.22μF
2
Thin SOT23 Flash LED Driver
2mm x 2mm Flash LED Driver with Output OVP
PowerPAK is a trademark of Siliconix, Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. ? 2180 Fortune Drive ? San Jose, CA 95131 ? USA ? tel +1 ( 408 ) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com
May 2007
1
M9999-051507
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2291YD5 | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: 制造商:Micrel Inc 功能描述: |
| MIC2291YD5 TR | 功能描述:LED照明驱动器 Photo Flash LED Driver (Lead Free) 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 |
| MIC2291YD5-TR | 功能描述:LED 驱动器 IC 1 输出 DC DC 稳压器 升压（升压） 模拟，PWM 调光 1.2A（开关） TSOT-23-5 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:有效 类型:DC DC 稳压器 拓扑:升压（升压） 内部开关:是 输出数:1 电压 - 供电（最低）:2.5V 电压 -?供电（最高）:10V 电压 - 输出:- 电流 - 输出/通道:1.2A（开关） 频率:1.2MHz 调光:模拟，PWM 应用:照相机闪光灯 工作温度:-40°C ~ 125°C （TJ） 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 供应商器件封装:TSOT-23-5 标准包装:1 |
| MIC2292 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High Frequency PWM White LED Drivers with Internal Schottky Diode and OVP |
| MIC2292_05 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High Frequency PWM White LED Drivers with Internal Schottky Diode and OVP |
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