ml4851 Microsemi Corporation, ml4851 Datasheet - Page 8
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ml4851
Manufacturer Part Number
ml4851
Description
Current, Voltage Boost Regulator
Manufacturer
Microsemi Corporation
Datasheet
1.ML4851.pdf
(9 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ml4851-3C
Manufacturer:
N/A
Quantity:
20 000
Part Number:
ml4851CS-3
Manufacturer:
ML
Quantity:
20 000
Part Number:
ml4851CS-5
Manufacturer:
ML
Quantity:
20 000
ML4851
DESIGN CONSIDERATIONS
LAYOUT
Good PC board layout practices will ensure the proper
operation of the ML4851. Important layout considerations
include:
A sample PC board layout is shown in Figure 6.
ML4851-3
8
L = 10µH
L = 18µH
L = 33µH
L = 56µH
Use adequate ground and power traces or planes
Keep components as close as possible to the ML4851
Use short trace lengths from the inductor to the V
and from the output capacitor to the V
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
V
1.0
1.5
2.0
1.0
1.5
2.0
2.5
3.0
1.0
1.5
2.0
2.5
3.0
1.0
1.5
2.0
2.5
3.0
IN
R
A
R
B
I
OUT
108.3
184.1
125.5
185.7
243.4
120.4
159.6
108.0
V
45.8
30.1
70.9
17.6
42.7
76.1
10.6
25.9
47.6
75.8
IN MIN
. 0 2
(mA)
(
)
Table 1. Maximum Output Current and Efficiency vs. V
1
EFFICIENCY PERCENTAGE
OUT
(Continued)
July, 2000
77.6
77.7
77.9
82.5
83.5
83.9
84.5
85.4
86.0
87.8
88.7
89.7
90.7
85.2
89.1
90.8
92.0
93.1
pin
L
pin
(6)
ML4851-5
DATASHEET
L = 10µH
L = 18µH
L = 33µH
L = 56µH
V
1.0
1.5
2.0
1.0
1.5
2.0
2.5
3.0
3.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
TOP LAYER
IN
Figure 6. Sample PC Board Layout
I
OUT
123.1
125.3
169.9
236.9
106.9
147.5
190.0
227.8
122.1
149.6
24.2
68.0
15.7
43.3
80.4
24.8
47.4
74.5
13.9
28.5
45.7
67.1
92.5
9.1
5.5
IN
(mA)
EFFICIENCY PERCENTAGE
BOTTOM LAYER
78.3
79.9
80.3
82.3
84.8
85.7
86.2
86.5
87.0
83.5
87.0
88.6
89.5
90.3
90.8
91.4
92.1
80.1
85.9
88.9
90.3
91.4
92.3
92.6
93.8