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Micrel Semiconductor
Micrel Semiconductor

MIC2287-24YML Datasheet Preview

MIC2287-24YML Datasheet

1.2MHz PWM White LED Driver with OVP in 2mm 2mm MLF and Thin SOT-23

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MIC2287-24YML pdf
MIC2287
Micrel
MIC2287
1.2MHz PWM White LED Driver with OVP in
2mm × 2mm MLF™ and Thin SOT-23
General Description
The MIC2287 is a 1.2MHz pulse width modulated (PWM),
boost-switching regulator that is optimized for constant-
current, white LED driver applications. With a maximum
output voltage of 34V and a switch current of over 500mA, the
MIC2287 easily drives a string of up to 8 white LEDs in series,
ensuring uniform brightness and eliminating several ballast
resistors.
The MIC2287 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.
The MIC2287 is available with 3 levels of overvoltage protec-
tion, 15V, 24V, and 34V. This allows designers to choose the
smallest possible external components with the appropriate
voltage ratings for their applications.
The MIC2287 is available in low profile Thin SOT-23 5-lead
and an 8-lead 2mm × 2mm MLF™ package options. The
MIC2287 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
Over 500mA switch current
1.2 MHz PWM operation
95mV feedback voltage
Output Overvoltage Protection (OVP)
Options for 15V, 24V, and 34V OVP
<1% line and load regulation
<1µA shutdown current
Over-temperature protection
UVLO
Low profile Thin SOT-23-5 package option
8-lead 2mm × 2mm MLFpackage option
• –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
Photo flash LED driver
LED flashlights
Constant current power supplies
Typical Application
10µH
CMDSH-3
10µH
CMDSH-3
1-Cell
Li Ion
MIC2287BD5
5
VIN
1
SW
1µF
4 EN
FB 3
95mV
GND
2
6.3
0.22µF
1-Cell
Li Ion
MIC2287-34BML
VIN SW
1µF EN OVP
FB
GND
95mV
6.3
0.22µF
3-Series White LED Driver in Thin SOT-23
6-Series White LED Driver
with Output OVP in 2mm × 2mm MLF-8
MLF and MicroLeadFrame 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
M0510-081104



Micrel Semiconductor
Micrel Semiconductor

MIC2287-24YML Datasheet Preview

MIC2287-24YML Datasheet

1.2MHz PWM White LED Driver with OVP in 2mm 2mm MLF and Thin SOT-23

No Preview Available !

MIC2287-24YML pdf
MIC2287
Ordering Information
Part Number
MIC2287BD5
MIC2287YD5
MIC2287-15BML
MIC2287-15YML
MIC2287-24BML
MIC2287-24YML
MIC2287-34BML
MIC2287-34YML
Marking
Code
SGAA
SGAA
SLA
SLA
SLB
SLB
SLC
SLC
Overvoltage
Protection
N/A
N/A
15V
15V
24V
24V
34V
34V
Junction
Temp. Range
Package
40°C to 125°C Thin SOT-23-5
40°C to 125°C Thin SOT-23-5
40°C to 125°C 2mm x 2mm MLF
40°C to 125°C 2mm x 2mm MLF
40°C to 125°C 2mm x 2mm MLF
40°C to 125°C 2mm x 2mm MLF
40°C to 125°C 2mm x 2mm MLF
40°C to 125°C 2mm x 2mm MLF
Lead Finish
Standard
Lead Free
Standard
Lead Free
Standard
Lead Free
Standard
Lead Free
Micrel
Pin Configuration
FB GND SW
321
45
EN VIN
TSOT-23-5 (BD5)
OVP 1
VIN 2
EN 3
AGND 4
8 PGND
7 SW
6 FB
EP 5 NC
8-Pin MLF(BML)
(Top View)
Fused Lead Frame
Pin Description
Pin Number Pin Number
TSOT-23-5 2mm ×2mm MLFPin Name
17
SW
2 GND
36
FB
43
52
1
4
8
5
EP
EN
VIN
OVP
AGND
PGND
NC
GND
Pin Function
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): 2.5V to 10V for internal circuitry.
Overvoltage protection (Input): Connect to the output.
Analog ground.
Power ground.
No connect (no internal connection to die).
Ground (Return): Exposed backside pad.
M0510-081104
2 August 2004


Part Number MIC2287-24YML
Description 1.2MHz PWM White LED Driver with OVP in 2mm 2mm MLF and Thin SOT-23
Maker Micrel Semiconductor
Total Page 10 Pages
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