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Micrel Semiconductor

MIC2287C Datasheet Preview

MIC2287C Datasheet

1.2MHz PWM White LED Driver

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MIC2287C
Micrel
MIC2287C
1.2MHz PWM White LED Driver with OVP in
2mm × 2mm MLF™ and Thin SOT-23
General Description
The MIC2287C is a 1.2MHz pulse width modulated (PWM),
boost-switching regulator that is optimized for constant-cur-
rent, white LED driver applications. With a maximum output
voltage of 37V and a switch current of over 500mA, the
MIC2287C easily drives a string of up to 6 white LEDs in
series, ensuring uniform brightness and eliminating several
ballast resistors.
The MIC2287C 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 MIC2287C 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 MIC2287C is available in low profile Thin SOT-23 5-
lead and an 8-lead 2mm × 2mm MLF™ package options.
The MIC2287C has a junction temperature range of –40°C
to +105°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
• Over-temperature protection
• UVLO
• Low profile Thin SOT-23-5 package option
• 8-lead 2mm × 2mm MLF™ package option
• –40°C to +105°C junction temperature range
• For higher performance specifications see the MIC2287
Applications
• White LED driver for backlighting:
- Cell phones
- PDAs
- GPS systems
- Digital cameras
- MP3 players
- IP phones
• LED flashlights
Typical Application
10H
CMDSH-3
1-Cell
Li Ion
MIC2287CBD5
5
VIN
1
SW
1F
4 EN
FB 3
95mV
GND
2
6.3
0.22F
1-Cell
Li Ion
10H
CMDSH-3
MIC2287C-34BML
VIN SW
1F EN OVP
FB
GND
95mV
6.3
0.22F
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. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
February 2006
1
M0510-020906




Micrel Semiconductor

MIC2287C Datasheet Preview

MIC2287C Datasheet

1.2MHz PWM White LED Driver

No Preview Available !

MIC2287C
Ordering Information
Part Number
Marking Overvoltage
Code
Protection
MIC2287CBD5
SGAA|
N/A
MIC2287CYD5
SGAA|
MIC2287C-15BML SLA
N/A
15V
MIC2287C-15YML SLA
15V
MIC2287C-24BML SLB
24V
MIC2287C-24YML SLB
24V
MIC2287C-34BML SLC
34V
MIC2287C-34YML SLC
34V
Junction
Temp. Range
Package
Lead Finish
–40°C to 105°C Thin SOT-23-5
Standard
–40°C to 105°C Thin SOT-23-5
–40°C to 105°C 2mm x 2mm MLF™
–40°C to 105°C 2mm x 2mm MLF™
–40°C to 105°C 2mm x 2mm MLF™
–40°C to 105°C 2mm x 2mm MLF™
–40°C to 105°C 2mm x 2mm MLF™
–40°C to 105°C 2mm x 2mm MLF™
Lead Free
Standard
Lead Free
Standard
Lead Free
Standard
Lead Free
Micrel
Pin Configuration
FB GND SW
321
Horizontal Mark
Denotes
Pb-Free
SGAA
Vertical Mark
Denotes
MIC2287C
45
EN VIN
TSOT-23-5 (BD5)
OVP 1
VIN 2
EN 3
GND 4
8 GND
Denotes Pb-Free
7 SW
6 FB
SLA
EP 5 NC
Denotes MIC2287C
8-Pin MLF™ (BML)
(Top View)
Pin Description
Pin Number Pin Number
TSOT-23-5 2mm × 2mm MLF™ Pin Name
17
SW
2 GND
36
FB
43
EN
52
—1
—4
—8
—5
— EP
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 regula-
tor.
Supply (Input): 2.7V to 8V 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.
M0510-020906
2 February 2006


Part Number MIC2287C
Description 1.2MHz PWM White LED Driver
Maker Micrel Semiconductor
Total Page 9 Pages
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