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MIC2292/93C
High Frequency PWM White LED Drivers
with Internal Schottky Diode and OVP
General Description
Features
ducts are available in a small size 8-pin 2mm × 2mm MLF
The MIC2292C and MIC2293C 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 MIC2292/93C 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 MIC2292/3C allows
direct operation from 1- and 2-cell Li Ion as well as 3- to 4-
cell NiCad/NiMH/Alkaline batteries. The MIC2292/3C pro-
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package and have a junction temperature range of
–40°C to +125°C.
Data sheets and support documentation can be found on
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2.5V to 10V input voltage
Output voltage up to 34V
Internal Schottky diode
1.6MHz PWM operation (MIC2292C)
2.0MHz PWM operation (MIC2293C)
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-pin 2mm × 2mm MLF ? package
–40°C to +125°C junction temperature range
Micrel’s web site at www.micrel.com .
Applications
? White LED driver for backlighting:
– Cell phones
– PDAs
– GPS systems
– Digital cameras
– MP3 players
– IP phones
? Constant current power supplies
Typical Application
15μH
MIC2292C-15YML
10μH
MIC2293C-15YML
VIN
SW
VIN
SW
Li Ion
1μF
EN
OUT
FB
95mV
0.22μF
16V
Li Ion
1μF
EN
OUT
FB
95mV
0.22μF
16V
GND
1.6MHz PWM White LED Driver with 15V OVP
GND
2MHz PWM White LED Driver with 15V OVP
MLF and Micro LeadFrame are registered 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
September 2009
1
M9999-091509-A
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