MIC2288 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – 1A 1.2 MHZ PWM BOOST CONVERTER IN THIN SOT 23 AND 2 X MLF

MIC2288
Micrel
MIC2288
1A 1.2MHz PWM Boost Converter in
Thin SOT-23 and 2×2 MLF™
General Description
The MIC2288 is a 1.2MHz PWM, DC/DC boost switching
regulator available in low-profile Thin SOT-23 and
2mm × 2mm MLF™ package options. High power density is
achieved with the MIC2288’s internal 34V/1A switch, allow-
ing it to power large loads in a tiny footprint.
The MIC2288 implements a constant frequency, 1.2MHz
PWM, current mode control scheme with internal compensa-
tion that offers excellent transient response and output regu-
lation performance. The high frequency operation saves
board space by allowing small, low-profile, external compo-
nents. The fixed frequency PWM topology also reduces
spurious switching noise and ripple to the input power source.
The MIC2288 is available in a low-profile Thin SOT-23-5
package and a 2mm × 2mm MLF™-8 leadless package. The
2mm × 2mm MLF™-8 package option has an output over-
voltage protection feature.
The MIC2288 has 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 range
• Output voltage adjustable to 34V
• Over 1A switch current
• 1.2MHz PWM operation
• Stable with ceramic capacitors
• High-efficiency
• <1% line and load regulation
• Low input and output ripple
• <1µA shutdown current
• UVLO
• Output overvoltage protection (MIC2288BML)
• Over temperature shutdown
• Thin SOT-23-5 package option
• 2mm × 2mm leadless MLF™-8 package option
• –40°C to +125°C junction temperature range
Applications
• Organic EL power supply
• TFT-LCD bias supply
• 12V supply for DSL applications
• Multi-output DC/DC converters
• Positive and negative output regulators
• SEPIC converters
Typical Application
V_IN
1-Cell
Li Ion
L1
10µH
C1
2.2µF
MIC2288BD5
5
VIN
1
SW
4 _EN
FB ³
GND
2
V_OUT
15V
R1
C2
R2 ^10µF
2mm × 2mm MLF™ Boost Regulator
15V_OUT Efficiency
90
V_IN = 4.2V
85
80
75
V_IN = 3.2V _{VIN = 3.6V}
70
65
600
0.05 0.1 0.15 0.2
LOAD (A)
MLF and MicroLeadFrame 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
February 2004
1
M9999-021904