MIC2141
Micropower Boost Converter General Description Features The MIC2141 is a micropower boost switching regulator Implements low-power boost, SEPIC, or flyback
that can operate from 3-or 4-cell nickel-metal-hydride 2.2V to 14V input voltage
batteries or a single Li-ion cell. This regulator employs a 330kHz switching frequency
constant 330kHz, fixed 18% duty-cycle, gated-oscillator <2ВµA shutdown current
architecture. 70ВµA quiescent current
The MIC2141 can be used in applications where the 1.24V bandgap reference
output voltage must be dynamically adjusted. The device
features a control signal input which is used to Typical output current 1mA to 10mA
proportionally adjust the output voltage. The control signal SOT23-5 package
input has a gain of 6, allowing a 0.8V to 3.6V control signal
to vary a 4.8V to 22V output.
Applications
The MIC2141 requires only three external components to
operate and is available in a tiny 5-pin SOT-23 package for LCD bias supply
space and power-sensitive portable applications. The CCD digital camera supply
MIC2141 draws only 70ВµA 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.
___________________________________________________________________________________________________________ Typical Application
Control Voltage
vs. Output Voltage 10ВµH …
