MIC2142 Micropower Boost Converter - 17 Pages

MIC2142
Micropower Boost Converter
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
October 2007 M9999-102507
General Description
The MIC2142 is a micropower boost switching regulator
housed in a SOT23-5 package. The input voltage range is
between 2.2V to 16V, making the device suitable for onecell
Li Ion and 3 to 4-cell alkaline/NiCad/NiMH applications.
The output voltage of the MIC2142 can be adjusted
up to 22V.
The MIC2142 is well suited for portable, space-sensitive
applications. It features a low quiescent current of 85ìA,
and a typical shutdown current of 0.1ìA. It’s 330kHz
operation allows small surface mount external components
to be used. The MIC2142 is capable of efficiencies over
85% in a small board area.
The MIC2142 can be configured to efficiently power a
variety of loads. It is capable of providing a few mA output
for supplying low power bias voltages; it is also capable of
providing the 80mA needed to drive 4 white LEDs.
The MIC2142 is available in a SOT23-5 package with an
ambient operating temperature range from –40°C to
+85°C.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
• 2.2V to 16V input voltage
• Up to 22V output voltage
• 330kHz switching frequency
• 0.1ìA shutdown current
• 85ìA quiescent current
• Implements low-power boost, SEPIC, or flyback
• SOT23-5 package
Applications
• LCD bias supply
• White LED driver
• 12V Flash memory supply
• Local 3V to 5V conversion
___________________________________________________________________________________________________________
Typical Application
R2
365k
R1
124k
+5V @60mA
2.8V to 4.7V
VIN
L1
33ìH D1
MIC2142
5
3
4
2
1 VCC SW
FB
EN GND
CIN
10ìF COUT 22ìF
0.40
0.45
0.50
0.55
0.60
0.65
0.70
0.75
0.80
0.85
0.90
0 10 20 30 40 50 60 70
EFFICIENCY (%)
OUTPUT CURRENT (mA)
Efficiency
vs. Output Current
VIN = 4.2V
VIN = 3.0V
Typical Configuration Efficiency vs. Output Current

  MIC2142 Micropower Boost Converter
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    Micrel, Inc. MIC2142October 2007 2 M9999-102507Ordering InformationPart Number Marking*Standard Pb-Free Standard Pb-FreeVoltage AmbientTemperature Range...
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    Micrel, Inc. MIC2142October 2007 3 M9999-102507Absolute Maximum Ratings(1)Supply Voltage (VCC)......................................................18VSwitch...
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    Micrel, Inc. MIC2142October 2007 4 M9999-102507Typical Characteristics0501001502002503003500 2 4 6 8 10 12 14 16QUIESCENT CURENT (ìA)INPUT VOLTAGE...
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    Micrel, Inc. MIC2142October 2007 5 M9999-102507Typical Characteristics (cont.)01234567-50 -30 -10 10 30 50 70 90 110RDS(ON) (Ù)TEMPERATURE (°C)RDS(ON)...
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    Micrel, Inc. MIC2142October 2007 6 M9999-102507Functional DiagramFIXED DUTY CYCLEFBENVCC1.265VGNDSWOscillatorMIC2142BandgapReferenceShutdown330kHzFunctional...
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