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MIC2297
40V PWM Boost Regulator
White LED Driver
General Description
Features
The MIC2297 is a 600KHz PWM boost-switching regulator
that is optimized for driving 6-10 series white LEDs. With
its internal 40V switch and a guaranteed switch current of
1.2A, the MIC2297 easily drives a string of 10 white LEDs
in series at 20mA, ensuring a high level of brightness and
eliminating several ballast resistors.
The MIC2297 implements constant frequency 600KHz
PWM control. The high frequency PWM operation saves
board space by reducing external component sizes. The
added benefit of the constant frequency PWM operation is
much lower noise and input ripple injected back to the
battery source than with variable frequency topologies.
To optimize efficiency, the feedback voltage is set to
200mV. This reduced voltage reduces the power
dissipation in the current set resistor, and allows the lowest
total output voltage, hence minimal current draw from the
battery.
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2.5V to 10V input voltage range
Output voltage up to 40V
1.2A switch current
600KHz PWM operation
Trimmed 200mV feedback voltage
Output over voltage protection (fixed or adjustable)
PWM Brightness Control
DAC Brightness Control
<1% line regulation
1μA shutdown current
Over temperature protection
UVLO
10-pin 2.5mm x 2.5mm MLF ? package
–40 o C to +125 o C junction temperature range
The MIC2297 is available with output over-voltage
protection that protects the IC and external components in
Applications
? PDAs
case of open LED conditions.
The MIC2297 is available in low profile small size 10-pin
2.5mm x 2.5mm MLF ? package. The MIC2297 has a
junction temperature range of –40°C to +125°C.
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GPS systems
Smart phones
Mini PCs
Digital cameras
IP phones
LED flashlights
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Typical Applications
6.8μH-22μH
6.8μH-22μH
/50V
1-Cell
Li I on
3V to 4.2V
1μF
VIN SW
EN
MIC2297
BRT - 42BM L
OVP
0.47μF
1-Ce ll
Li I on
3V to 4.2V
1μF
PWM
VIN SW
EN
MIC2297
BRT - 42BM L
OVP
0.47μF
/50V
REF
FB
REF
FB
1μF
AGND PGND COMP
0.1μF
10
1μF
AGND PGND COMP
0.1μF
10
10 Series LED Driver with Output OVP
10 Series LED Driver with PWM Brightness Control
MLF and Micro LeadFrame is a trademark 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
March 2008
M9999-032708
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相关代理商/技术参数
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MIC2297-42YML-TR 功能描述:LED 驱动器 IC 1 输出 DC DC 稳压器 升压（升压） PWM 调光 1.2A（开关） 10-MLF?（3x3） 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:600kHz 调光:PWM 应用:- 工作温度:-40°C ~ 125°C （TJ） 安装类型:表面贴装 封装/外壳:10-VFDFN 裸露焊盘，10-MLF? 供应商器件封装:10-MLF?（3x3） 标准包装:1
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MIC2298-15YML 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述:
MIC2298-15YML TR 功能描述:LED照明驱动器 7W 1MHz White LED Driver 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
MIC2298-15YMLTR 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: