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器件描述：Micropower Boost Converter Preliminary Information
器件厂商：MICREL [Micrel Semiconductor]
厂商主页：http://www.micrel.com/
文件大小：154.96KB
文件页数：16
PDF阅读：MIC2141-BM5.pdf (点击阅读器件资料)
摘要：
June 2000 1 MIC2141
MIC2141 Micrel
Micrel, Inc. ? 1849 Fortune Drive ? San Jose, CA 95131 ? USA ? tel + 1 (408) 944-0800 ? fax + 1 (408) 944-0970 ? http://www.micrel.com
MIC2141
Micropower Boost Converter
Preliminary Information
General Description
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-lead SOT-23 package for
space and power-sensitive portable applications. The
MIC2141 draws only 70?A of quiescent current and can
operate with an efficiency exceeding 85%.
Features
? Implements low-power boost, SEPIC, or flyback
? 2.5V to 14V input voltage
? 330kHz switching frequency
?<2?A shutdown current
?70?A quiescent current
? 1.24V bandgap reference
? typical output current 1mA to 10mA
? SOT-23-5 Package
Applications
? LCD bias supply
? CCD digital camera supply
Ordering Information
Part Number Junction Temp. Range Package
MIC2141-BM5 –40°C to +85°C SOT-23-5
Typical Application
MIC2141
Variable
V
OUT
V
C
*
(from DAC)
10?F
10?H
15
2
34
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0 5 10 15 20 25
V
C
(V)
V
OUT
(V)
Control Voltage
vs. Output Voltage
DAC-Controlled LCD Bias Voltage Supply
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