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Micrel Semiconductor
Micrel Semiconductor

MIC2289-15YML Datasheet Preview

MIC2289-15YML Datasheet

2mm 2mm White LED Driver with Internal Schottky Diode and OVP

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MIC2289-15YML pdf
MIC2289
Micrel
MIC2289
2mm × 2mm White LED Driver
with Internal Schottky Diode and OVP
General Description
The MIC2289 is a PWM (pulse width modulated), boost-
switching regulator that is optimized for constant-current
white LED driver applications. The MIC2289 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 MIC2289 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 varible frequency is much lower noise and input
ripple injected to the input power source.
The MIC2289 clamps the output voltage in case of open LED
conditions, protecting itself and the output capacitor. The
MIC2289 is available with three output OVP options of 15V,
24V, and 34V. The different OVP options allows the use of
the smallest possible output capacitor with the appropriate
voltage rating for a given application.
The MIC2289 is available in a 2mm × 2mm 8-pin MLF™
package and 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.
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
<1mA shutdown current
Overtemperature protection
UVLO
2mm × 2mm 8-pin MLFpackage
• –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
LED flashlights
Constant current power supplies
Typical Application
10µH
1-Cell
Li Ion
MIC2289-15BML
VIN SW
1µF
OUT
EN FB 95mV
GND
6.3
0.22µF/16V
3-Series White LED Driver
3-Series LED Efficiency
82
80
78
76
74
72
VIN =3.6V
700 5 10 15 20 25
IOUT (mA)
MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
August, 2004
1
M9999-081104



Micrel Semiconductor
Micrel Semiconductor

MIC2289-15YML Datasheet Preview

MIC2289-15YML Datasheet

2mm 2mm White LED Driver with Internal Schottky Diode and OVP

No Preview Available !

MIC2289-15YML pdf
MIC2289
Ordering Information
Part Number
MIC2289-15BML
MIC2289-15YML
MIC2289-24BML
MIC2289-24YML
MIC2289-34BML
MIC2289-34YML
Marking
Code
SNA
SNA
SNB
SNB
SNC
SNC
Overvoltage
Protection
15V
15V
24V
24V
34V
34V
Junction
Temp. Range
40°C to 125°C
40°C to 125°C
40°C to 125°C
40°C to 125°C
40°C to 125°C
40°C to 125°C
Package
2mm × 2mm MLF-8
2mm × 2mm MLF-8
2mm × 2mm MLF-8
2mm × 2mm MLF-8
2mm × 2mm MLF-8
2mm × 2mm MLF-8
Lead Finish
Standard
Lead Free
Standard
Lead Free
Standard
Lead Free
Micrel
Pin Configuration
Pin Description
Pin Number
1
2
3
5
6
7
4,8
EP
OUT 1
VIN 2
EN 3
AGND 4
8 PGND
7 SW
6 FB
EP 5 NC
MLF-8 (BML)
(Top View)
Fused Lead Frame
Pin Name
OUT
VIN
EN
NC
FB
SW
GND
GND
Pin Function
Output Pin and Overvoltage Protection (Output): Connect to the output
capacitor and LEDs
Supply (Input): Input voltage.
Enable (Input): Logic high enables regulator, logic low shuts down regulator.
No connect (no internal connection to die).
Feedback (Input): Output voltage sense node. Connect the cathode of the
LED to this pin. A resistor from this pin to ground sets the LED current.
Switch Node (Input): Internal power transistor collector.
Ground (Return): Ground.
Ground (Return): Backside pad.
M9999-081104
2 August, 2004


Part Number MIC2289-15YML
Description 2mm 2mm White LED Driver with Internal Schottky Diode and OVP
Maker Micrel Semiconductor
Total Page 9 Pages
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Micrel Semiconductor
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