MIC2290 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – 2mm × 2mm PWM Boost Regulator with Internal Schotty Diode

MIC2290
Micrel
MIC2290
2mm × 2mm PWM Boost Regulator with
Internal Schotty Diode
General Description
The MIC2290 is a 1.2MHz , PWM, boost-switching regulator
housed in the small size 2mm × 2mm MLF™-8 package. The
MIC2290 features an internal Schottky diode that reduces
circuit board area and total solution cost. High power density
is achieved with the MIC2290’s internal 34V/0.5A switch,
allowing it to power large loads in a tiny footprint.
The MIC2290 implements a constant frequency 1.2MHz
PWM control scheme. The high frequency operation saves
board space by reducing external component sizes. The
fixed frequency PWM topology also reduces switching noise
and ripple to the input power source.
The MIC2290’s wide 2.5V to 10V input voltage allows direct
operation from 3- to 4-cell NiCad/NiMH/Alkaline batteries, 1-
and 2-cell Li Ion batteries, as well as fixed 3.3V and 5V
systems.
The MIC2290 is available in a low-profile 2mm × 2mm
8-pin MLF™ leadless package and operates from 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
• Internal Schottky diode
• 2.5V to 10V input voltage
• Output voltage adjustable to 34V
• Over 500mA switch current
• 1.2MHz PWM operation
• Stable with ceramic capacitors
• <1% line and load regulation
• Low input and output ripple
• <1µA shutdown current
• UVLO
• Output overvoltage protection
• Over temperature protection
• 2mm × 2mm 8-pin MLF™ package
• –40°C to +125°C junction temperature range
Applications
• Organic EL power supply
• TFT LCD bias supply
• 12V DSL power supply
• CCD bias supply
• SEPIC converters
Typical Application
L1
V_IN
10µH
Li Ion
Battery
MIC2290BML
2
7
VIN SW
3
1
EN OUT
C1
6
1µF
FB
GND
4, 8
V_OUT
12V
R1
C2
10µF
R2
Simple 12V Boost Regulator
12V_OUT Efficiency
85
V_IN = 4.2V
80
75 ^{VIN = 3.2V}
70
V_IN = 3.6V
65
600 _{0.02 0.04 0.06 0.08 0.1}
LOAD CURRENT (A)
MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
August 2004
1
M9999-081104