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SC600 Datasheet(PDF) 11 Page - Semtech Corporation

Part # SC600
Description  mAhXLifeTM LED Driver with 5.0V, 4.5V, or 4.0V Output
PDF  19 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC600 Datasheet(HTML) 11 Page - Semtech Corporation

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11
© 2006 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC600
Applications Information (Cont.)
Mode Transition Impedance
The mode transition impedance Ro refers to the output
resistance of the charge pump before a transition to a
stronger mode occurs. Ro is dependent upon the frac-
tional charge pump, switching frequency, bucket capaci-
tor value, bucket capacitor ESR, and the internal switch
resistances.
Ro is proportional to,
1
fC
Ro can be measured to verify a low transition imped-
ance. Before measuring Ro, select the capacitors, set
the operating frequency and a constant load current. Find
the input voltage just before a weak to strong mode tran-
sition (i.e., 1.5x to 2x mode). Measure V
IN, VOUT, and IOUT
before the transition.
Ro will be,
Ro=
mode V IN V OUT
I OUT
Table 2 -Ripple Performance (Cont.)
.
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5
.
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]
F
μ
[C
T
E
K
C
U
B
]
F
μ
[
B
0
0
6
C
S
)
1
(
V
5
.
4
80
15
1
20
51
1
2
30
40
0
30
91
1
2
6
20
2
10
45
21
1
0
5
60
2
15
15
21
1
0
5
60
2
10
35
43
3
.
01
V
0
.
4
D
0
0
6
C
S
80
15
0
10
51
1
2
30
40
4
25
41
1
2
6
20
2
10
30
21
1
0
5
60
2
11
10
21
1
0
5
60
2
15
20
43
3
.
01
Note: (1) SC600C is very similar to SC600B.
A lower value of Ro will improve efficiency, so low ESR
ceramic capacitors are required. An X7R or X5R dielec-
tric is recommended. Y5V dielectric can require 2 to 3
times the rated value of an X7R dielectric for the same
performance over the operating temperature range.
Efficiency
Efficiency for the SC600 is defined as,
η =
V O I O
V IN mode I O I Q



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