900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf






Micrel Semiconductor

MIC2287 Datasheet Preview

MIC2287 Datasheet

1.2MHz PWM White LED Driver

No Preview Available !

MIC2287
MIC2287
Micrel, Inc.
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 MLF™ package 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
1-Cell
Li Ion
MIC2287BD5
5 VIN
SW 1
1µF
4 EN
FB 3
95mV
GND
2
6.3Ω
0.22µF
1-Cell
Li Ion
10µH
CMDSH-3
MIC2287-34BML
VIN SW
1µF EN OVP
FB
GND
95mV
6.3Ω
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. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
July 2005
1 M9999-070105




Micrel Semiconductor

MIC2287 Datasheet Preview

MIC2287 Datasheet

1.2MHz PWM White LED Driver

No Preview Available !

MIC2287
Ordering Information
Part Number
Marking Overvoltage
Code
Protection
MIC2287BD5
SGAA
N/A
MIC2287YD5
SGAA
N/A
MIC2287-15BML
SLA
15V
MIC2287-15YML
SLA
15V
MIC2287-24BML
SLB
24V
MIC2287-24YML
SLB
24V
MIC2287-34BML
SLC
34V
MIC2287-34YML
SLC
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, Inc.
Pin Configuration
FB GND SW
321
45
EN VIN
TSOT-23-5 (BD5)
OUT 1
VIN 2
EN 3
GND 4
8 GND
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 MLF™
17
2
36
Pin Name
SW
GND
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): 2.5V 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.
M9999-070105
2
July 2005


Part Number MIC2287
Description 1.2MHz PWM White LED Driver
Maker Micrel Semiconductor
Total Page 10 Pages
PDF Download

MIC2287 Datasheet PDF

View PDF for Mobile








Similar Datasheet

1 MIC2282 Single-Cell Ultra Low EMI Boost LED Driver
Micrel Semiconductor
2 MIC2285A 8MHz PWM Synchronous Buck Regulator
MICREL
3 MIC2287 1.2MHz PWM White LED Driver
Micrel Semiconductor
4 MIC2287C 1.2MHz PWM White LED Driver
Micrel Semiconductor
5 MIC2288 1A 1.2MHz PWM Boost Converter
Micrel Semiconductor
6 MIC2288 1A 1.2 MHz PWM Boost Converter
Microchip
7 MIC2289 2mm 2mm White LED Driver with Internal Schottky Diode and OVP
Micrel Semiconductor
8 MIC2289C White LED Driver Internal Schottky Diode and OVP
MICREL





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy