MIC2292_05 Datasheet, PDF (1/9 Pages) Micrel Semiconductor – High Frequency PWM White LED Drivers with Internal Schottky Diode and OVP

MIC2292/93
MIC2292/93
Micrel, Inc.
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.
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
• <1µA 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
Typical Application
15µH
Li Ion
MIC2292-15BML
VIN SW
1µF
OUT
EN
FB
GND ^95mV
6.3Ω
0.22µF
16V
10µH
Li Ion
MIC2293-15BML
VIN SW
1µF
OUT
EN
FB
GND ^95mV
6.3Ω
0.22µF
16V
1.6MHz PWM White LED Driver with 15V OVP
2MHz PWM White LED Driver with 15V OVP
MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
July 2005
1
M9999-070105