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參數(shù)資料
| 型號(hào)： | MIC2291YD5 |
| 廠商： | MICREL INC |
| 元件分類： | 顯示驅(qū)動(dòng)器 |
| 英文描述： | 1.2A PWM Boost Regulator Photo Flash LED Driver |
| 中文描述： | LED DISPLAY DRIVER, PDSO5 |
| 封裝： | LEAD FREE, TSOT-23, 5 PIN |
| 文件頁(yè)數(shù)： | 1/9頁(yè) |
| 文件大小： | 107K |
| 代理商： | MIC2291YD5 |
August, 2004
1
M9999-081104
MIC2291
Micrel
MIC2291
1.2A PWM Boost Regulator
Photo Flash LED Driver
General Description
The MIC2291 is a 1.2MHz Pulse Width Modulation (PWM),
boost-switching regulator that is optimized for high-current,
white LED photo flash 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 benefit 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
the smallest possible external components with the appropri-
ate voltage ratings for their applications.
The MIC2291 is available in low-profile, Thin SOT23 5-lead
and 8-lead 2mm
×
2mm MLF package options. The MIC2291
has a junction temperature range of –40
°
C to +125
°
C.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
Typical Application
10
μ
H
0.22
μ
F
ceramic
0.95
95mV
1-Cell
Li Ion
3V to 4.2V
1
μ
F
2
3
1
4
5
MIC2291BD5
VIN
EN
SW
FB
GND
100mA
Thin SOT23 Flash LED Driver
Features
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
1
μ
A shutdown current
Over temperature protection
UVLO
Low-profile Thin SOT23-5 package option
2mm
×
2mm MLF
package option
–
40
°
C to +125
°
C junction temperature range
Applications
Photo Flash LED driver
Cell phones
PDAs
GPS systems
Digital cameras
IP phones
LED flashlights
Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 http://www.micrel.com
MLF and MicroeadFrame are trademarks of Amkor Technology, Inc.
PowerPAK is a trademark of Siliconix, Inc.
10
μ
H
0.22
μ
F
1
μ
F
1-Cell
Li Ion
3V to 4.2V
0.95
MIC2291-15BML
VIN
EN
SW
OVP
FB
GND
95mV
100mA
2mm
×
2mm Flash LED Driver with Output OVP
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC2526-2BM | Dual USB Power Control Switch Not Recommended for New Designs |
| MIC2526-1BM | Dual USB Power Control Switch Not Recommended for New Designs |
| MIC2526-1BN | Dual USB Power Control Switch Not Recommended for New Designs |
| MIC2526 | Dual USB Power Control Switch Not Recommended for New Designs |
| MIC2526-2BN | Dual USB Power Control Switch Not Recommended for New Designs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2291YD5 TR | 功能描述:LED照明驅(qū)動(dòng)器 Photo Flash LED Driver (Lead Free) RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| MIC2291YD5-TR | 功能描述:LED 驅(qū)動(dòng)器 IC 1 輸出 DC DC 穩(wěn)壓器 升壓（升壓） 模擬，PWM 調(diào)光 1.2A（開(kāi)關(guān)） TSOT-23-5 制造商:microchip technology 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 類型:DC DC 穩(wěn)壓器 拓?fù)?升壓（升壓） 內(nèi)部開(kāi)關(guān):是 輸出數(shù):1 電壓 - 供電（最低）:2.5V 電壓 -?供電（最高）:10V 電壓 - 輸出:- 電流 - 輸出/通道:1.2A（開(kāi)關(guān)） 頻率:1.2MHz 調(diào)光:模擬，PWM 應(yīng)用:照相機(jī)閃光燈 工作溫度:-40°C ~ 125°C （TJ） 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細(xì)型，TSOT-23-5 供應(yīng)商器件封裝:TSOT-23-5 標(biāo)準(zhǔn)包裝:1 |
| MIC2292 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:High Frequency PWM White LED Drivers with Internal Schottky Diode and OVP |
| MIC2292_05 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:High Frequency PWM White LED Drivers with Internal Schottky Diode and OVP |
| MIC2292_11 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:High Frequency PWM White LED Drivers with Internal Schottky Diode and OVP |
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