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參數(shù)資料
| 型號： | MIC2291 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | Replaced by PTH05060W : |
| 中文描述： | 1.2A的PWM升壓穩(wěn)壓相機(jī)閃光燈LED驅(qū)動器 |
| 文件頁數(shù)： | 1/9頁 |
| 文件大?。?/td> | 107K |
| 代理商： | MIC2291 |
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 |
|---|---|
| MIC2291-15BML | Replaced by PTH05060W : |
| MIC2291-15YML | Replaced by PTH05060W : |
| MIC2291-34BML | Replaced by PTH05060W : |
| MIC2291YD5 | 1.2A PWM Boost Regulator Photo Flash LED Driver |
| MIC2526-2BM | 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 |
|---|---|
| MIC2291_07 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:1.2A PWM Boost Regulator Photo Flash LED Driver |
| MIC2291_11 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:1.2A PWM Boost Regulator Photo Flash LED Driver |
| MIC2291-15BML | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:1.2A PWM Boost Regulator Photo Flash LED Driver |
| MIC2291-15BML TR | 功能描述:IC LED DRIVER PHOTO FLASH 8-MLF RoHS:否 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?PWM，切換式電容器（充電泵） 輸出數(shù):1 內(nèi)部驅(qū)動器:是 類型 - 主要:背光 類型 - 次要:白色 LED 頻率:642kHz 電源電壓:2.7 V ~ 5.5 V 輸出電壓:5V 安裝類型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-VSON 包裝:剪切帶 (CT) 工作溫度:-30°C ~ 85°C 產(chǎn)品目錄頁面:1371 (CN2011-ZH PDF) 其它名稱:BD1603NUV-E2CT |
| MIC2291-15YML | 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: |
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