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ML4871CS-3 Datasheet(PDF) 8 Page - Micro Linear Corporation

Part # ML4871CS-3
Description  High Current Boost Regulator
PDF  9 Pages
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Manufacturer  MICRO-LINEAR [Micro Linear Corporation]
Direct Link  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4871CS-3 Datasheet(HTML) 8 Page - Micro Linear Corporation

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ML4871
IOUT(MAX) (mA)
VIN (V)
VOUT = 3.3V
VOUT = 5.0V
1.8
386.2
286.2
2.0
451.9
332.1
2.2
521.5
379.1
2.4
585.9
430.0
2.6
651.0
479.0
2.8
716.5
525.4
3.0
782.0
571.8
3.2
618.5
3.4
665.0
3.6
711.7
3.8
758.7
4.0
805.3
4.2
851.9
4.4
899.0
4.6
946.1
4.8
992.7
IOUT (mA)
EFFICIENCY PERCENTAGE
VIN = 2.4V, VOUT = 3.3V
1.0
82.0
2.0
84.4
5.0
87.0
10.0
87.6
20.0
87.9
50.0
88.3
100.0
88.6
200.0
88.2
586.0
65.1
VIN = 2.4V, VOUT = 5.0V
1.0
84.4
2.0
87.0
5.0
87.7
10.0
88.4
20.0
88.9
50.0
89.1
100.0
88.9
200.0
87.5
485.0
71.6
Table 1. Typical IOUT and Efficiency vs. VIN
DESIGN EXAMPLE
In order to design a boost converter using the ML4871, it
is necessary to define a few parameters. For this example,
assume that VIN = 3.0V to 3.6V, VOUT = 5.0V, and
IOUT(MAX) = 500mA.
First, it must be determined whether the ML4871 is
capable of delivering the output current. This is done using
Equation 1:
I
V
V
AA
OUT MAX
()
.
.
.
..
=™ 
  ™=
125
30
50
07
0 53
Next, select an inductor. As previously mentioned, the
recommended inductance is 10µH. Make sure that the
peak current rating of the inductor is at least 1.5A, and
that the DC resistance of the inductor is in the range of 50
to 100m
W.
Finally, the value of the output capacitor is determined
using Equation 2:
C
H
V
F
OUT =
™
=
44 10
50
88
m
m
.
The closest standard value would be a 100µF capacitor
with an ESR rating of 100m
W. If such a low ESR value
cannot be found, two 47µF capacitors in parallel could
also be used.
Figure 9. Typical Application Circuit
ML4871
VOUT
100µF
100µF
VIN
10µH
(Sumida CD75)
VL1
VIN
GND
DETECT
PWR GND
RESET
VL2
VOUT
The complete circuit is shown in Figure 9. As mentioned
previously, the use of an input supply bypass capacitor is
highly recommended.



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