Boost Converter. MIC2141 Datasheet

MIC2141 Converter. Datasheet pdf. Equivalent

Part MIC2141
Description Micropower Boost Converter
Feature MIC2141 Micropower Boost Converter General Description Features The MIC2141 is a micropower boost.
Manufacture Micrel Semiconductor
Total Page 17 Pages
Datasheet
Download MIC2141 Datasheet



MIC2141
MIC2141
Micropower Boost Converter
General Description
Features
The MIC2141 is a micropower boost switching regulator
that can operate from 3- or 4-cell nickel-metal-hydride
batteries or a single Li-ion cell. This regulator employs a
constant 330kHz, fixed 18% duty-cycle, gated-oscillator
architecture.
The MIC2141 can be used in applications where the
output voltage must be dynamically adjusted. The device
features a control signal input which is used to
proportionally adjust the output voltage. The control signal
input has a gain of 6, allowing a 0.8V to 3.6V control signal
to vary a 4.8V to 22V output.
The MIC2141 requires only three external components to
operate and is available in a tiny 5-pin SOT-23 package for
space and power-sensitive portable applications. The
MIC2141 draws only 70µA of quiescent current and can
operate with an efficiency exceeding 85%.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Implements low-power boost, SEPIC, or flyback
2.2V to 14V input voltage
330kHz switching frequency
<2µA shutdown current
70µA quiescent current
1.24V bandgap reference
Typical output current 1mA to 10mA
SOT23-5 package
Applications
LCD bias supply
CCD digital camera supply
___________________________________________________________________________________________________________
Typical Application
VC*
(from DAC)
10µH
MIC2141
15
2
34
Variable
VOUT
10µF
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
00
DAC-Controlled LCD Bias Voltage Supply
Control Voltage
vs. Output Voltage
5 10 15 20 25
VOUT (V)
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
December 2006
1 M9999-122006



MIC2141
Micrel, Inc.
MIC2141
Ordering Information
Part Number
Standard
Pb-Free
MIC2141BM5 MIC2141YM5
Marking*
Standard Pb-Free
SAAA
SAAA
* 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
IN
GND
SW
FB
VC
Pin Function
Input: +2.5V to +14V supply for internal circuity.
Ground: Return for internal circuitry and internal MOSFET (switch) source.
Switch Node (Input): Internal MOSFET drain; 22V maximum.
Feedback (Input): Output voltage sense node. Compared to VC control input
voltage.
Control (Input): Output voltage control signal input. Input voltage of 0.8V to3.6V
is proportional to 4.8V to 22V output voltage (gain of 6). If the pin is not
connected, the output voltage will be VIN – 0.5V.
December 2006
2 M9999-122006





@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)