MIC2145_05 Datasheet, PDF (10/15 Pages) Micrel Semiconductor – High Efficiency 2.5W Boost Converter

MIC2145
Inductor
The MIC2145 has a programmable peak current to allow the
usage of small surface mount inductors. A 10µH or 4.7µH
inductor is recommended for most portable applications such
as powering white LEDs and biasing LCD panels. The
Micrel, Inc.
inductor should have a saturation current rating higher than
the peak current during circuit operation. A low ESR (Equiva-
lent Series Resistance) inductor is also desirable for high
efficiency. Below are tables that list the maximum output
current at minimum input voltage with efficiencies greater
than 80%.
V V _IN(min)
IN(max)
RSET
I_OUT(max)
(V)
(V)
(ΩΩ) (mA)
4.5
80
V_OUT
(V)
5
9.5
25
10
2.4
10k
11.5
20
12
14.5
15
15
4.5
150
5
9.5
50
10
3.0
10k
11.5
40
12
14.5
30
15
4.5
250
5
9.5
70
10
3.6
10k
11.5
50
12
14.5
40
15
9.5
190
10
5.0 11.5 10k 130
12
14.5
90
15
Table 1. Typical Application for 10µH Inductor in
Basic Configuration
V V _IN(min)
IN(max)
RSET
I_OUT(max)
(V) (V) (Ω ) (mA)
4.5
160
9.5
100
2.4
10k
11.5
90
14.5
70
4.5
250
9.5
150
3.0
10k
11.5
120
14.5
100
4.5
350
9.5
170
3.6
10k
11.5
150
14.5
120
9.5
300
5.0 11.5 10k 250
14.5
200
V_OUT
(V)
5
10
12
15
5
10
12
15
5
10
12
15
10
12
15
Table 2. Typical Application for 10µH Inductor in
Bootstrap Configuration
V
V
IN(min)
IN(max)
(V) (V)
RSET
(Ω)
I
OUT(max)
(mA)
4.5
250
V
OUT
(V)
5
9.5
80
10
3.0
400
9.5
60
12
9.5
50
15
Table 3. Typical Application for 4.7µH Inductor in
Basic Configuration
V V _IN(min)
IN(max)
(V) (V)
RSET
(Ω)
I_OUT(max)
(mA)
4.5
500
V_OUT
(V)
5
4.5
225
10
3.0
200
4.5
150
12
4.5
130
15
Table 4. Typical Application for 4.7µH Inductor in
Bootstrap Configuration
M9999-042205
10
April 2005