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MICREL

MIC2289C Datasheet Preview

MIC2289C Datasheet

White LED Driver Internal Schottky Diode and OVP

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MIC2289C www.DataSheet4U.com
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 benet 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 ashlights
Constant current power supplies
Typical Application
10µH
1-Cell
Li Ion
MIC2289C-15BML
VIN SW
1µF
OUT
EN FB 95mV
GND
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)
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




MICREL

MIC2289C Datasheet Preview

MIC2289C Datasheet

White LED Driver Internal Schottky Diode and OVP

No Preview Available !

Micrel, Inc.
Ordering Information
Part Number
Marking Overoltage
Code
Protection
MIC2289CBD5
SGAA|
N/A
MIC2289CYD5
SGAA|
N/A
MIC2289C-15BML
SLA
15V
MIC2289C-15YML
SLA
15V
MIC2289C-24BML
SLB
24V
MIC2289C-24YML
SLB
24V
MIC2289C-34BML
SLC
34V
MIC2289C-34YML
SLC
34V
Note: Marking bars may not be to scale.
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
–40°C to +125°C
–40°C to +125°C
Package
5-Pin Thin SOT-23
5-Pin Thin SOT-23
8-Pin 2mm x 2mm MLF®
8-Pin 2mm x 2mm MLF®
8-Pin 2mm x 2mm MLF®
8-Pin 2mm x 2mm MLF®
8-Pin 2mm x 2mm MLF®
8-Pin 2mm x 2mm MLF®
www.DataShMeetI4CU.2co2m89C
Lead Finish
Standard
Pb-Free
Standard
Pb-Free
Standard
Pb-Free
Standard
Pb-Free
Pin Configuration
Denotes
Pb-Free
FB GND SW
321
SGAA
Denotes
MIC2289C
45
EN VIN
5- Pin Thin SOT-23 (D5)
OUT 1
VIN 2
EN 3
AGND 4
8 PGND
Denotes Pb-Free
7 SW SLA
6 FB
EP 5 NC
Denotes MIC2289C
8-Pin MLF® (ML)
(Top View)
Fused Lead Frame
Pin Description
Pin Number
TSOT-23-5
1
2
3
Pin Number
MLF® -8
7
6
43
52
1
4
8
5
EP
Pin Name
SW
GND
FB
EN
VIN
OUT
AGND
PGND
NC
GND
Pin Name
Switch node (Input): Internal power BIPOLAR collector.
Ground (Return): Ground.
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.
Enable (Input): Logic high enables regulator. Logic low shuts
down regulator.
Supply (Input): 2.7V to 8V for internal circuitry.
Output Pin and Overvoltage Protection (Output): Connect to the
output capacitor and LEDs.
Analog ground.
Power ground.
No connect (no internal connection to die).
Ground (Return): Exposed backside pad.
September 2006
2
M9999-090706


Part Number MIC2289C
Description White LED Driver Internal Schottky Diode and OVP
Maker MICREL
Total Page 10 Pages
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