MIC2290_07 Datasheet, PDF (1/13 Pages) Micrel Semiconductor – 2mm × 2mm PWM Boost Regulator with Internal Schotty Diode

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 8-pin MLF^®
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.
Data sheets and 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
MIC2290
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)
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
October 2007
M9999-101907