參數(shù)資料
型號： MIC2287-15BML
廠商： MICREL INC
元件分類： 顯示驅動器
英文描述： Replaced by PTH05060W :
中文描述： LED DISPLAY DRIVER, DSO8
封裝： 2 X 2 MM, MLF-8
文件頁數(shù)： 1/10頁
文件大小： 111K
代理商： MIC2287-15BML
August 2004
1
M0510-081104
MIC2287
Micrel
MIC2287
1
.2MHz PWM White LED Driver with OVP in
2mm
×
2mm MLF and Thin SOT-23
General Description
The MIC2287 is a 1.2MHz pulse width modulated (PWM),
boost-switching regulator that is optimized for constant-
current, white LED driver applications. With a maximum
output voltage of 34V and a switch current of over 500mA, the
MIC2287 easily drives a string of up to 8 white LEDs in series,
ensuring uniform brightness and eliminating several ballast
resistors.
The MIC2287 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
as opposed 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 MIC2287 is available with 3 levels of overvoltage protec-
tion, 15V, 24V, and 34V. This allows designers to choose the
smallest possible external components with the appropriate
voltage ratings for their applications.
The MIC2287 is available in low profile Thin SOT-23 5-lead
and an 8-lead 2mm
×
2mm MLF package options. The
MIC2287 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
6.3
95mV
1-Cell
Li Ion
1
μ
F
2
3
1
4
5
MIC2287BD5
VIN
EN
SW
FB
GND
CMDSH-3
3-Series White LED Driver in Thin SOT-23
Features
2.5V to 10V input voltage
Output voltage up to 34V
Over 500mA switch current
1.2 MHz PWM operation
95mV feedback voltage
Output Overvoltage Protection (OVP)
Options for 15V, 24V, and 34V OVP
<1% line and load regulation
<1
μ
A shutdown current
Over-temperature protection
UVLO
Low profile Thin SOT-23-5 package option
8-lead 2mm
×
2mm MLF
package option
–
40
°
C to +125
°
C junction temperature range
Applications
White LED driver for backlighting:
- Cell phones
- PDAs
- GPS systems
- Digital cameras
- MP3 players
- IP phones
Photo flash LED driver
LED flashlights
Constant current power supplies
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.
10
μ
H
0.22
μ
F
1
μ
F
1-Cell
Li Ion
6.3
MIC2287-34BML
VIN
EN
SW
OVP
FB
GND
95mV
CMDSH-3
6-Series White LED Driver
with Output OVP in 2mm
×
2mm MLF
-8
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