MIC2289
White LED Driver Internal Schottky Diode and OVP
Features
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.
2.5V to 10V Input Voltage Range
Output Voltage up to 34V
Internal Schottky Diode
15V, 24V, 34V Output OVP Options
1.2 MHz PWM Operation
Over 500 mA Switch Current
95 mV Feedback Voltage
10 kHz) can be used to control LED
intensity.
VIN
VIN
SW
OUT
FB
EN
PWM
GND
FIGURE 4-1:
PWM Dimming Method.
VIN
EQUATION 4-1:
VIN
SW
OUT
95mV
I LED = --------------R FB
FB
EN
GND
5.11k
49.9k
DC
Equivalent
The Enable pin shuts down the output switching and
disables control circuitry to reduce VIN pin input current
to leakage current level. Enable pin input current is
zero at zero volt.
4.1
Dimming Control
There are two techniques for dimming control. One is
PWM dimming, and the other is continuous dimming.
1.
PWM dimming control is implemented by applying a PWM signal on EN pin as shown in
Figure 4-1. The MIC2289 is turned on and off by
the PWM signal. With this method, the LEDs
operate with either zero or full current. The average LED current is increased proportionally to
the duty-cycle of the PWM signal. This technique has high efficiency because the IC and the
LEDs consume no current during the off-cycle of
the PWM signal. Typical frequency should be
between 100 Hz and 10 kHz.
2019 Microchip Technology Inc.
FIGURE 4-2:
4.2
Continuous Dimming.
Open Circuit Protection
If the LEDs are disconnected from the circuit, or in case
an LED fails open, the sense resistor will pull the FB pin
to ground. This will cause the MIC2289 to switch with a
high duty cycle, resulting in output overvoltage. This
may cause the SW pin voltage to exceed its maximum
voltage rating, possibly damaging the IC and the
external components. To ensure the highest level of
protection, the MIC2289 has three product options in
the 2 mm × 2 mm DFN-8 with overvoltage protection,
OVP. The OUT pin of the MIC2289 allows a dedicated
OVP monitor with options for 15V, 24V, or 34V (see
Figure 4-3). The reason for the three OVP levels is to
let users choose the suitable level of OVP for their
application. For example, a 3-LED application would
typically see an output voltage of no more than 12V, so
DS20006207A-page 9
MIC2289
a 15V OVP option would offer a suitable level of
protection. This allows the user to select the output
diode and capacitor with the lowest voltage ratings,
therefore smallest size and lowest cost. The OVP will
clamp the output voltage to within the specified limits.
VIN
VIN
SW
OUT
FB
EN
GND
FIGURE 4-3:
4.3
OVP Detection via OUT Pin.
Start-Up and Inrush Current
During start-up, inrush current of approximately double
the nominal current flows to set up the inductor current
and the voltage on the output capacitor. If the inrush
current needs to be limited, a soft-start circuit similar to
Figure 4-4 could be implemented. The soft-start
capacitor, CSS, provides over drive voltage to the FB
pin at start-up, resulting in gradual increase of switch
duty cycle and limited inrush current.
VIN
CSS
VIN
2200pF
SW
OUT
FB
EN
GND
R
FIGURE 4-4:
DS20006207A-page 10
10k
Soft-Start Circuit.
2019 Microchip Technology Inc.
MIC2289
5.0
EXTERNAL COMPONENT SELECTION
The MIC2289 can be used across a wide rage of applications. The table below shows recommended inductor and
output capacitor values for various series-LED applications.
TABLE 5-1:
Series
LEDs
EXTERNAL COMPONENT SELECTION
L
22 μH
15 μH
2
10 μH
6.8 μH
4.7 μH
22 μH
15 μH
3
10 μH
6.8 μH
4.7 μH
22 μH
15 μH
4
10 μH
6.8 μH
4.7 μH
Part #
Manufacturer
LQH43MN220K03L
Murata
NLC453232T-220K-PF
TDK
LQH43MN150K03L
Murata
NLC453232T-150K-PF
TDK
LQH43MN100K03L
Murata
NLC453232T-100K-PF
TDK
LQH43MN6R8K03L
Murata
NLC453232T-6R8K-PF
TDK
LQH43MN4R7K03L
Murata
NLC453232T-4R7K-PF
TDK
LQH43MN220K03L
Murata
NLC453232T-220K-PF
TDK
LQH43MN150K03L
Murata
NLC453232T-150K-PF
TDK
LQH43MN100K03L
Murata
NLC453232T-100K-PF
TDK
LQH43MN6R8K03L
Murata
NLC453232T-6R8K-PF
TDK
LQH43MN4R7K03L
Murata
NLC453232T-4R7K-PF
TDK
LQH43MN220K03L
Murata
NLC453232T-220K-PF
TDK
LQH43MN150K03L
Murata
NLC453232T-150K-PF
TDK
LQH43MN100K03L
Murata
NLC453232T-100K-PF
TDK
LQH43MN6R8K03L
Murata
NLC453232T-6R8K-PF
TDK
LQH43MN4R7K03L
Murata
NLC453232T-4R7K-PF
TDK
2019 Microchip Technology Inc.
Min. COUT
2.2 μF, 10V
1 μF, 10V
0.22 μF, 10V
0.22 μF, 10V
0.22 μF, 10V
2.2 μF, 16V
1 μF, 16V
0.22 μF, 16V
0.22 μF, 16V
0.27 μF, 16V
1 μF, 25V
1 μF, 25V
0.27 μF, 25V
0.27 μF, 25V
0.27 μF, 25V
Part #
Manufacturer
0805ZD225KAT2A
AVX
GRM21BR61A225KA01L
Murata
0805ZD105KAT2A
AVX
GRM21BR61A105KA01L
Murata
0805ZD224KAT2A
AVX
GRM21BR71C224KA36L
Murata
0805ZD224KAT2A
AVX
GRM21BR71C224KA36L
Murata
0805ZD224KAT2A
AVX
GRM21BR71C224KA36L
Murata
0805YD225KAT2A
AVX
GRM21BR71C225KA12L
Murata
0805YD105KAT2A
AVX
GRM21BR71C105KA01L
Murata
0805YC224KAT2A
AVX
GRM21BR71C224KA36L
Murata
0805YC224KAT2A
AVX
GRM21BR71C224KA36L
Murata
0805YC274KAT2A
AVX
C0805C274K4RACTU
Kemet
08053D105KAT2A
AVX
C0805C105K3RACTU
Kemet
08053D105KAT2A
AVX
C0805C105K3RACTU
Kemet
08053C274KAT2A
AVX
C0805C274K3RACTU
Kemet
08053C274KAT2A
AVX
C0805C274K3RACTU
Kemet
08053C274KAT2A
AVX
C0805C274K3RACTU
Kemet
DS20006207A-page 11
MIC2289
TABLE 5-1:
Series
LEDs
EXTERNAL COMPONENT SELECTION (CONTINUED)
L
22 μH
15 μH
5, 6
10 μH
6.8 μH
4.7 μH
22 μH
15 μH
7, 8
10 μH
6.8 μH
4.7 μH
DS20006207A-page 12
Part #
Manufacturer
LQH43MN220K03L
Murata
NLC453232T-220K-PF
TDK
LQH43MN150K03L
Murata
NLC453232T-150K-PF
TDK
LQH43MN100K03L
Murata
NLC453232T-100K-PF
TDK
LQH43MN6R8K03L
Murata
NLC453232T-6R8K-PF
TDK
LQH43MN4R7K03L
Murata
NLC453232T-4R7K-PF
TDK
LQH43MN220K03L
Murata
NLC453232T-220K-PF
TDK
LQH43MN150K03L
Murata
NLC453232T-150K-PF
TDK
LQH43MN100K03L
Murata
NLC453232T-100K-PF
TDK
LQH43MN6R8K03L
Murata
NLC453232T-6R8K-PF
TDK
LQH43MN4R7K03L
Murata
NLC453232T-4R7K-PF
TDK
Min. COUT
0.22 μF, 25V
0.22 μF, 25V
0.27 μF, 25V
0.27 μF, 25V
0.27 μF, 25V
0.22 μF, 35V
0.22 μF, 35V
0.27 μF, 50V
0.27 μF, 50V
0.27 μF, 50V
Part #
Manufacturer
08053C224KAT2A
AVX
GRM21BR71E224KA01L
Murata
08053C224KAT2A
AVX
GRM21BR71E224KA01L
Murata
08053C274KAT2A
AVX
C0805C274K3RACTU
Kemet
08053C274KAT2A
AVX
C0805C274K3RACTU
Kemet
08053C274KAT2A
AVX
C0805C274K3RACTU
Kemet
0805DD224KAT2A
AVX
GRM21BR71H224KA01L
Murata
0805DD224KAT2A
AVX
GRM21BR71H224KA01L
Murata
08055C274KAT2A
AVX
C0805C274K5RACTU
Kemet
08055C274KAT2A
AVX
C0805C274K5RACTU
Kemet
08055C274KAT2A
AVX
C0805C274K5RACTU
Kemet
2019 Microchip Technology Inc.
MIC2289
6.0
PACKAGING INFORMATION
6.1
Package Marking Information
6-Lead TSOT23*
Example
XXXX
SM24
8-Lead DFN*
Example
XXX
NNN
TABLE 6-1:
SNA
818
MIC2289 PACKAGE MARKING CODES
Part Number
Package
OVP
Product Code
MIC2289-24YD6
TSOT23-6
24V
SM24
MIC2289-15YML
DFN-8
15V
SNA
MIC2289-24YML
DFN-8
24V
SNB
MIC2289-34YML
DFN-8
34V
SNC
Legend: XX...X
Y
YY
WW
NNN
e3
*
Product code or customer-specific information
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Pb-free JEDEC® designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator ( e3 )
can be found on the outer packaging for this package.
●, ▲, ▼ Pin one index is identified by a dot, delta up, or delta down (triangle
mark).
Note:
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information. Package may or may not include
the corporate logo.
Underbar (_) and/or Overbar (‾) symbol may not be to scale.
2019 Microchip Technology Inc.
DS20006207A-page 13
MIC2289
6-Lead Thin SOT23 Package Outline & Recommended Land Pattern
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging.
DS20006207A-page 14
2019 Microchip Technology Inc.
MIC2289
8-Lead 2 mm x 2 mm DFN Package Outline and Recommended Land Pattern
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging.
2019 Microchip Technology Inc.
DS20006207A-page 15
MIC2289
NOTES:
DS20006207A-page 16
2019 Microchip Technology Inc.
MIC2289
APPENDIX A:
REVISION HISTORY
Revision A (July 2019)
• Converted Micrel document MIC2289 to Microchip data sheet template DS20006207A.
• Minor grammatical corrections throughout.
2019 Microchip Technology Inc.
DS20006207A-page 17
MIC2289
NOTES:
DS20006207A-page 18
2019 Microchip Technology Inc.
MIC2289
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, contact your local Microchip representative or sales office.
PART NO.
-XX
X
XX
–XX
Device
Feature
Junction
Temperature
Range
Package
Media Type
Device:
MIC2289: White LED Driver Internal Schottky Diode
and OVP
15
24
34
=
=
=
15V OVP (DFN Only)
24V OVP
34V OVP (DFN Only)
(OVP = Overvoltage Protection)
Junction
Temperature Range:
Y
=
–40°C to +125°C, Extended
RoHS Compliant
Package:
D6
ML
=
=
6-Lead TSOT (24V OVP only)
12-Lead 3 mm x 3 mm x 0.9 mm DFN
Media Type:
TR
TX
=
=
TR
=
3,000/Reel (D6, TSOT)
3,000/Reel (D6, TSOT),
Reverse pin 1 Orientation
5,000/Reel (ML, DFN)
Feature:
Examples:
a) MIC2289-15YML-TR:
White LED Driver Internal Schottky
Diode, 15V OVP, Extended –40°C
to +125°C Junction Temperature
Range, RoHS compliant, 8-Lead
DFN 2 mm x 2 mm x 0.9 mm
Package, 5,000/Reel
b) MIC2289-24YML-TR:
White LED Driver Internal Schottky
Diode, 24V OVP, Extended –40°C
to +125°C Junction Temperature
Range, RoHS compliant, 8-Lead
DFN 2 mm x 2 mm x 0.9 mm
Package, 5,000/Reel
c) MIC2289-34YML-TR:
White LED Driver Internal Schottky
Diode, 34V OVP, Extended –40°C
to +125°C Junction Temperature
Range, RoHS compliant, 8-Lead
DFN 2 mm x 2 mm x 0.9 mm
Package, 5,000/Reel
d) MIC2289-24YD6-TR:
White LED Driver Internal Schottky
Diode, 24V OVP, Extended –40°C
to +125°C Junction Temperature
Range, RoHS compliant, 6-Lead
TSOT Package, 3,000/Reel
e) MIC2289-24YD6-TX:
White LED Driver Internal Schottky
Diode, 24V OVP, Extended –40°C
to +125°C Junction Temperature
Range, RoHS compliant, 6-Lead
TSOT Package, Reverse Pin 1
Orientation, 3,000/Reel
Note 1:
2019 Microchip Technology Inc.
Tape and Reel identifier only appears in the
catalog part number description. This identifier is
used for ordering purposes and is not printed on
the device package. Check with your Microchip
Sales Office for package availability with the
Tape and Reel option.
DS20006207A-page 19
MIC2289
NOTES:
DS20006207A-page 20
2019 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
arising from this information and its use. Use of Microchip
devices in life support and/or safety applications is entirely at
the buyer’s risk, and the buyer agrees to defend, indemnify and
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conveyed, implicitly or otherwise, under any Microchip
intellectual property rights unless otherwise stated.
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© 2019, Microchip Technology Incorporated, All Rights Reserved.
For information regarding Microchip’s Quality Management Systems,
please visit www.microchip.com/quality.
2019 Microchip Technology Inc.
ISBN: 978-1-5224-4724-5
DS20006207A-page 1
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DS20006207A-page 28
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2019 Microchip Technology Inc.
05/14/19
