Boost Converter. MIC2142 Datasheet

MIC2142 Converter. Datasheet pdf. Equivalent

Part MIC2142
Description Micropower Boost Converter
Feature MIC2142 Micropower Boost Converter General Description Features The MIC2142 is a micropower boost.
Manufacture Micrel Semiconductor
Total Page 17 Pages
Datasheet
Download MIC2142 Datasheet



MIC2142
MIC2142
Micropower Boost Converter
General Description
Features
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 one-
cell Li Ion and 3 to 4-cell alkaline/NiCad/NiMH applica-
tions. 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 85µA,
and a typical shutdown current of 0.1µA. 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 congured 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.
2.2V to 16V input voltage
Up to 22V output voltage
330kHz switching frequency
0.1µA shutdown current
85µA quiescent current
Implements low-power boost, SEPIC, or yback
SOT23-5 package
Applications
LCD bias supply
White LED driver
12V Flash memory supply
Local 3V to 5V conversion
___________________________________________________________________________________________________________
Typical Application
2.8V to 4.7V
VIN
10CµIFN
L1
33µH
D1
+5V @60mA
MIC2142
1 VCC SW 3
FB 4
5 EN GND 2
R2
365k
R1
124k
C22OµUFT
Typical Configuration
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.400
Efficiency
vs. Output Current
VIN = 4.2V
VIN = 3.0V
10 20 30 40 50 60 70
OUTPUT CURRENT (mA)
Efficiency vs. Output Current
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



MIC2142
Micrel, Inc.
MIC2142
Ordering Information
Part Number
Standard
Pb-Free
MIC2142BM5 MIC2142YM5
Marking*
Standard Pb-Free
SBAA
SBAA
* Under bar symbol (_) may not be to scale.
Voltage
Adj.
Ambient
Temperature Range
–40° to +85°C
Package
5-Pin SOT23
Pin Configuration
5-Pin SOT23 (BM5)
5-Pin SOT23 (YM5)
Pin Description
Pin Number
1
2
3
4
5
Pin Name
VCC
GND
SW
FB
EN
Pin Function
Chip Supply: +2.2V to +16V.
Ground: Return for internal circuitry and internal MOSFET (switch) source.
Switch Node (Input): Internal MOSFET drain; 22V maximum.
Feedback (Input): Output voltage sense node.
Shutdown: Device shuts down to 0.1µA typical supply current.
October 2007
2 M9999-102507





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