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參數(shù)資料
| 型號(hào)： | MAX1682 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Switched-Capacitor Voltage Doublers |
| 中文描述： | 開關(guān)電容倍壓器 |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 81K |
| 代理商： | MAX1682 |
M
Conversion losses occur during the charge transfer
between C1 and C2 when there is a voltage difference
between them. The power loss is:
where V
RIPPLE
is the peak-to-peak output voltage ripple
determined by the output capacitor and load current
(see Output Capacitor section). Choose capacitor val-
ues that decrease the output resistance (see Flying
Capacitor section).
Applic ations Information
Flying Capac itor (C1)
To maintain the lowest output resistance, use capaci-
tors with low ESR. Suitable capacitor manufacturers are
listed in Table 1. The charge-pump output resistance is
a function of C1 and C2’s ESR and the internal switch
resistance, as shown in the equation for R
OUT
in the
Efficiency Considerations section.
Minimizing the charge-pump capacitor’s ESR mini-
mizes the total resistance. Suggested values are listed
in Tables 2 and 3.
Using a larger flying capacitor reduces the output
impedance and improves efficiency (see the Efficiency
Considerations section). Above a certain point, increas-
ing C1’s capacitance has a negligible effect because
the output resistance becomes dominated by the inter-
nal switch resistance and capacitor ESR (see the
Output Resistance vs. Capacitance graph in the
Typical Operating Characteristics). Table 2 lists the
most desirable capacitor values—those that produce a
low output resistance. But when space is a constraint, it
may be necessary to sacrifice low output resistance for
the sake of small capacitor size. Table 3 demonstrates
how the capacitor affects output resistance.
Output Capac itor (C2)
Increasing the output capacitance reduces the output
ripple voltage. Decreasing its ESR reduces both output
resistance and ripple. Smaller capacitance values can
be used with light loads. Use the following equation to
calculate the peak-to-peak ripple:
V
RIPPLE
= I
OUT
/ (f
OSC
x C2) + 2 x I
OUT
x ESR
C2
Input Bypass Capac itor
Bypass the incoming supply to reduce its AC imped-
ance and the impact of the MAX1682/MAX1683’s
switching noise. When loaded, the circuit draws a con-
tinuous current of 2 x I
OUT
. A 0.1μF bypass capacitor is
sufficient.
P
12
V
12
V
x f
CONVERSION LOSS
IN
2
OUT
2
OUT RIPPLE
2RIPPLE
OSC
=
+
S witc hed-Capac itor Voltage Doublers
6
_______________________________________________________________________________________
Table 1. Recommended Capacitor Manufacturers
Table 2. Suggested Capacitor Values for
Low Output Resistance
Table 3. Suggested Capacitor Values for
Minimum Size
MANUFACTURER
AVX
Matsuo
Sprague
AVX
Matsuo
PRODUCTION METHOD
SERIES
TPS
267
PHONE
FAX
803-946-0690
714-969-2491
603-224-1961
803-946-0590
714-969-2491
803-448-2170
714-960-6492
603-224-1430
803-626-3123
714-960-6492
Surface-Mount Tantalum
593D, 595D
X7R
X7R
Surface-Mount Ceramic
PART
FREQUENCY
(kHz)
MAX1682
MAX1683
12
35
CAPACITOR
VALUE (μF)
10
3.3
TYPICAL
R
OUT
(
)
20
20
PART
FREQUENCY
(kHz)
CAPACITOR
VALUE (μF)
MAX1682
MAX1683
12
35
3.3
1
TYPICAL
R
OUT
(
)
35
35
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