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MIC2292 Datasheet(PDF) 1 Page - Micrel Semiconductor

Part No. MIC2292
Description  High Frequency PWM White LED Drivers with Internal Schottky Diode and OVP
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Maker  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
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MIC2292 Datasheet(HTML) 1 Page - Micrel Semiconductor

   
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August, 2004
1
M9999-081204
MIC2292/93
Micrel
MIC2292/93
High Frequency PWM White LED Drivers with
Internal Schottky Diode and OVP
General Description
The MIC2292 and MIC2293 are high frequency, Pulse Width
Modulator (PWM) boost regulators optimized for constant-
current, white LED driver applications. Because of their
constant PWM switching frequencies of 1.6MHz and 2MHz,
respectively, the MIC2292/93 can use the smallest external
components, allowing designers to avoid sensitive IF bands
in their RF applications.
The products feature an internal Schottky diode and two
levels of output overvoltage protection allowing a small size
and efficient DC/DC solution that requires only four external
components.
The 2.5V to 10V input voltage range of MIC2292/3 allows
direct operation from 1- and 2-cell Li Ion as well as 3- to 4-cell
NiCad/NiMH/Alkaline batteries. The MIC2292/3 products are
available in a small size 2mm
× 2mm 8-lead MLF™ package
and have 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.
Typical Application
1.6MHz PWM White LED Driver with 15V OVP
Features
• 2.5V to 10V input voltage
• Output voltage up to 34V
• Internal Schottky diode
• 1.6MHz PWM operation (MIC2292)
• 2.0MHz PWM operation (MIC2293)
• Stable with ceramic capacitors
• 15V and 34V output overvoltage protection options
• 500mA switch current rating
• 95mV feedback voltage
• <1% line and load regulation
•<1
µA shutdown current
• Over-temperature protection
• UVLO
• 8-lead (2mm
× 2mm) MLF™package
•–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
• Constant current power supplies
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
MLF and
MicroLeadFrame are trademarks of Amkor Technology, Inc.
2MHz PWM White LED Driver with 15V OVP
15
µH
0.22
µF
16V
6.3
95mV
Li Ion
1
µF
MIC2292-15BML
VIN
EN
SW
FB
GND
OUT
10
µH
0.22
µF
16V
6.3
95mV
Li Ion
1
µF
MIC2293-15BML
VIN
EN
SW
FB
GND
OUT


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