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MIC3291-25YD6 参数 Datasheet PDF下载

MIC3291-25YD6图片预览
型号: MIC3291-25YD6
PDF下载: 下载PDF文件 查看货源
内容描述: 1.2MHz的PWM白光LED驱动器,内置肖特基二极管和单线线性亮度控制 [1.2MHz PWM White LED Driver with Internal Schottky Diode and Single-Wire Linear Brightness Control]
分类和应用: 驱动器肖特基二极管接口集成电路光电二极管
文件页数/大小: 17 页 / 800 K
品牌: MICREL [ MICREL SEMICONDUCTOR ]
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MIC3291
1.2MHz PWM White LED Driver
with Internal Schottky Diode and
Single-Wire Linear Brightness
Control
General Description
Features
The MIC3291 is a PWM switching boost regulator that is
Single wire combines 16 level linear brightness and
optimized for constant current white LED (WLED) driver
shutdown control
applications. The MIC3291 features an internal Schottky
18V / 25V OVP options supports up to four and six
diode, allowing an efficient DC/DC solution that requires
WLEDs
only four external components.
Startup in any one of 16 brightness levels
The MIC3291 allows for a single-wire simple digital
Internal Schottky diode
interface to control the dimming over 16 steps with a linear
2.5V to 6.5V input voltage
scale. The preprogramming feature allows the user to
1.2MHz PWM operation
select any one of the 16 WLED current levels as the start
up brightness level.
Over 500mA switch current
The feedback voltage of the MIC3291 is only 250mV,
250mV reference voltage
allowing high efficiency while retaining excellent accuracy
• ±5%
LED current accuracy
for the WLED current.
<1µA shutdown current
The MIC3291 implements a constant frequency 1.2MHz
UVLO and over-temperature protection
PWM control scheme. The high frequency PWM operation
Thin SOT23-6L package option
saves board space by reducing external component sizes.
The 1.2MHz PWM scheme also reduces switching noise
2mm × 2mm leadless MLF
®
package option
and ripple to the input power source.
–40
o
C to +125
o
C junction temperature range
The 2.5V to 6.5V input voltage range of the MIC3291
allows direct operation from single cell Li-Ion as well as 3
Applications
to 4 cell NiCad/NiMH/Alkaline batteries. Battery life is
preserved with a low 1µA shutdown current.
Mobile handsets
The MIC3291 is available in a low profile Thin SOT23 6-
LCD handset backlighting
®
pin and 2mm × 2mm MLF 8-pin packages with a junction
Digital cameras
temperature range of –40°C to +125°C.
Portable media players/MP3 players
Data sheets and support documentation can be found on
Portable applications
Micrel’s web site at:
___________________________________________________________________________________________________________
Typical Application
White LED Driver with OVP and Digital Control
MLF and
MicroLead
Frame are registered trademarks of Amkor Technologies, 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
September 2010
M9999-092810
(408) 944-0800