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PDF MIC2142 Data sheet ( Hoja de datos )
| Número de pieza | MIC2142 | |
| Descripción | Micropower Boost Converter | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MIC2142 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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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 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.
• 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 flyback
• 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
1 page  
Micrel, Inc.
Typical Characteristics (cont.)
RDS(ON) vs.
7 Temperature
6 VCC=3.3V
5
4
3 VCC = 4.5V
2
1
-050 -30 -10 10 30 50 70 90 110
TEMPERATURE °(C)
Timing Characteristics
Over Temperature
0.6
0.58
0.56
0.54
0.52
0.5
0.48
0.46
0.44
0.42
0.-450 -30 -10 10 30 50 70 90 110
TEMPERATURE °(C)
MIC2142
October 2007
5 M9999-102507
5 Page 
Micrel, Inc.
VIN(min)
2.5V
2.5V
2.5
2.5
2.5
2.5
3.0
3.0
3.0
3.0
3.0
3.0
5.0
5.0
5.0
5.0
9
9
9
12
12
VIN(max)
3.0V
4.5V
11.5
4.7
14.5
4.7
4.7
4.7
4.7
8.5
4.7
4.7
14.5
4.7
4.7
4.7
8.5
11.5
14.5
9
8.0
11.5
14
14
14
14
VOUT
3.3V
5V
boot strapped
boot strapped
12
boot strapped
boot strapped
15
boot strapped
boot strapped
20
20
5
boot strapped
boot strapped
9
boot strapped
boot strapped
15
boot strapped
boot strapped
20
9
12
15
20
12
15
20
15
20
IOUT(max)
40mA
23mA
10mA
16.5mA
7.8mA
51
77
1.8
2.25
15
22
3.7
1.7
17.4
8
2.7
1.5
40
70
100
15
28
40
7.8
14
21
5.6
70
23
10
43
14
6
30
10
30
8
118
66
30
70
40
18
20
10
6
156
71
27
35
L1
47µH
85µH
180µH
47µH
100µH
15
10
47
100
15
10
47
100
10
22
47
82
33
18
12
33
18
12
33
18
12
33
27
82
180
27
82
180
27
82
27
68
56
100
220
56
100
220
120
220
390
68
150
390
150
IPK @ VIN(max)
129mA
74mA
34VmA
193mA
91mA
605
908
493
232
632
950
622
292
950
430
202
110
287
525
800
520
525
800
886
525
800
287
635
209
95
860
283
129
1083
357
672
237
414
232
105
504
282
128
235
128
72
415
182
72
188
Table 4. Typical Maximum Power Configuration
CR1
BAT54
BAT54
BAT54
BAT54
BAT54
MBR0530
MBR
MBR
BAT
MBR
MBR
MBR
BAT
MBR
MBR
BAT
BAT
BAT
MBR
MBR
MBR
MBR
MBR
MBR
MBR
MBR
BAT
MBR
BAT
BAT
MBR
BAT
BAT
MBR
MBR
MBR
BAT
MBR
BAT
BAT
MBR
BAT
BAT
BAT
BAT
BAT
MBR
BAT
BAT
BAT
MIC2142
October 2007
11 M9999-102507
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet MIC2142.PDF ] | |
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