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MIC2289C-24YML

Description
White LED Driver Internal Schottky Diode and OVP
File Size271KB,10 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
Download Datasheet Compare View All

MIC2289C-24YML Overview

White LED Driver Internal Schottky Diode and OVP

MIC2289C
White LED Driver Internal Schottky
Diode and OVP
General Description
The MIC2289C is a PWM (pulse width modulated), boost-
switching regulator that is optimized for constant-current
white LED driver applications. The MIC2289C features an
internal Schottky diode and three levels of output
overvoltage protection providing a small size and efficient
DC/DC solution that requires only four external
components.
To optimize efficiency, the feedback voltage is set to only
95mV. This reduces power dissipation in the current set
resistor and allows the lowest total output voltage, hence
minimal current draw from the battery.
The MIC2289C 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 caparison to variable frequency is much lower noise and
input ripple injected to the input power source.
The MIC2289C clamps the output voltage in case of open
LED conditions, protecting itself and the output capacitor.
The MIC2289C is available with three output OVP options
of 15V, 24V, and 34V. The different OVP options allow the
use of the smallest possible output capacitor with the
appropriate voltage rating for a given application.
The MIC2289C is available in low profile 5-pin Thin SOT-
23 and 8-pin 2mm × 2mm MLF
®
package options. The
MIC2289C has a junction temperature range of –40°C to
+125°C.
Data sheets and support documentation can be found on
Micrel’s web site at
www.micrel.com.
Features
2.5V to 10V input voltage
Output voltage up to 34V
Internal Schottky diode
15V, 24V, 34V output OVP options
1.2 MHz PWM operation
Over 500mA switch current
95mV feedback voltage
<1% line and load regulation
<1µA shutdown current
Overtemperature protection
UVLO
2mm × 2mm 8-pin MLF
®
package
–40°C to +125°C junction temperature range
For higher performance specifications see the MIC2289
Applications
White LED driver for backlighting:
– Cell phones
– PDAs
– GPS systems
– Digital cameras
– MP3 players
– IP phones
LED
flashlights
Constant current power supplies
Typical Application
10µH
82
80
EFFICIENCY (%)
MIC2289C-15BML
1-Cell
Li Ion
VIN
1µF
EN
GND
SW
OUT
FB
95mV
0.22µF/16V
3-Series LED Efficiency
78
76
74
72
70
0
V
IN
=3.6V
5
10
15
I
OUT
(mA)
20
25
3-Series White LED Driver
MLF and
MicroLeadFrame
are registered trademarks 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
September 2006
1
M9999-090706

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