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ML4851 Datasheet(PDF) 8 Page - Micro Linear Corporation

Part # ML4851
Description  Low Current, Voltage Boost Regulator
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Manufacturer  MICRO-LINEAR [Micro Linear Corporation]
Direct Link  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4851 Datasheet(HTML) 8 Page - Micro Linear Corporation

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8
ML4851
July, 2000
DATASHEET
TOPLAYER
BOTTOMLAYER
ML4851-3
ML4851-5
DESIGN CONSIDERATIONS (Continued)
Figure 6. Sample PC Board Layout
Table 1. Maximum Output Current and Efficiency vs. VIN
VIN
IOUT (mA)
EFFICIENCY PERCENTAGE
L = 10µH
1.0
24.2
78.3
1.5
68.0
79.9
2.0
123.1
80.3
L = 18µH
1.0
15.7
82.3
1.5
43.3
84.8
2.0
80.4
85.7
2.5
125.3
86.2
3.0
169.9
86.5
3.5
236.9
87.0
L = 33µH
1.0
9.1
83.5
1.5
24.8
87.0
2.0
47.4
88.6
2.5
74.5
89.5
3.0
106.9
90.3
3.5
147.5
90.8
4.0
190.0
91.4
4.5
227.8
92.1
L = 56µH
1.0
5.5
80.1
1.5
13.9
85.9
2.0
28.5
88.9
2.5
45.7
90.3
3.0
67.1
91.4
3.5
92.5
92.3
4.0
122.1
92.6
4.5
149.6
93.8
VIN
IOUT (mA)
EFFICIENCY PERCENTAGE
L = 10µH
1.0
45.8
77.6
1.5
108.3
77.7
2.0
184.1
77.9
L = 18µH
1.0
30.1
82.5
1.5
70.9
83.5
2.0
125.5
83.9
2.5
185.7
84.5
3.0
243.4
85.4
L = 33µH
1.0
17.6
86.0
1.5
42.7
87.8
2.0
76.1
88.7
2.5
120.4
89.7
3.0
159.6
90.7
L = 56µH
1.0
10.6
85.2
1.5
25.9
89.1
2.0
47.6
90.8
2.5
75.8
92.0
3.0
108.0
93.1
RR
V
AB
IN MIN


()
.
02
1
(6)
LAYOUT
Good PC board layout practices will ensure the proper
operation of the ML4851. Important layout considerations
include:
n Use adequate ground and power traces or planes
n Keep components as close as possible to the ML4851
n Use short trace lengths from the inductor to the VL pin
and from the output capacitor to the VOUT pin
n Use a single point ground for the ML4851 PWR GND
pin and the input and output capacitors, and connect
GND to PWR GND with a separate trace
A sample PC board layout is shown in Figure 6.


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