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MIC2287C Datasheet(PDF) 1 Page - Micrel Semiconductor

No. de pieza MIC2287C
Descripción Electrónicos  1.2MHz PWM White LED Driver with OVP in 2mm2mm MLF??and Thin SOT-23
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Fabricante Electrónico  MICREL [Micrel Semiconductor]
Página de inicio  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC2287C Datasheet(HTML) 1 Page - Micrel Semiconductor

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February 2006
1
M0510-020906
MIC2287C
Micrel
MIC2287C
1.2MHz PWM White LED Driver with OVP in
2mm × 2mm MLF™ and Thin SOT-23
Typical Application
10�H
0.22�F
6.3�
95mV
1-Cell
Li Ion
1�F
2
3
1
4
5
MIC2287CBD5
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
• Over-temperature protection
• UVLO
• Low profile Thin SOT-23-5 package option
• 8-lead 2mm × 2mm MLF™ package option
• –40°C to +105°C junction temperature range
• For higher performance specifications see the MIC2287
Applications
• White LED driver for backlighting:
- Cell phones
- PDAs
- GPS systems
- Digital cameras
- MP3 players
- IP phones
• LED flashlights
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc.
10�H
0.22�F
1�F
1-Cell
Li Ion
6.3�
MIC2287C-34BML
VIN
EN
SW
OVP
FB
GND
95mV
CMDSH-3
6-Series White LED Driver
with Output OVP in 2mm × 2mm MLF™-8
General Description
The MIC2287C is a 1.2MHz pulse width modulated (PWM),
boost-switching regulator that is optimized for constant-cur-
rent, white LED driver applications. With a maximum output
voltage of 37V and a switch current of over 500mA, the
MIC2287C easily drives a string of up to 6 white LEDs in
series, ensuring uniform brightness and eliminating several
ballast resistors.
The MIC2287C 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.
TheMIC2287Cisavailablewith3levelsofovervoltageprotec-
tion, 15V, 24V, and 34V. This allows designers to choose the
smallest possible external components with the appropriate
voltage ratings for their applications.
The MIC2287C is available in low profile Thin SOT-23 5-
lead and an 8-lead 2mm × 2mm MLF™ package options.
The MIC2287C has a junction temperature range of –40°C
to +105°C.
All support documentation can be found on Micrel’s web site
at www.micrel.com.


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