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參數(shù)資料
| 型號(hào)： | MAX1683EUK-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | Switched-Capacitor Voltage Doublers |
| 中文描述： | SWITCHED CAPACITOR CONVERTER, 57.8 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁(yè)數(shù)： | 7/8頁(yè) |
| 文件大?。?/td> | 81K |
| 代理商： | MAX1683EUK-T |
Casc ading Devic es
Devices can be cascaded to produce an even larger
voltage (Figure 3). The unloaded output voltage is nom-
inally (n + 1) x V
IN
, where n is the number of voltage
doublers used. This voltage is reduced by the output
resistance of the first device multiplied by the quiescent
current of the second. The output resistance increases
when devices are cascaded. Using a two-stage dou-
bler as an example, output resistance can be approxi-
mated as R
OUT
= 2 x R
OUT1
+ R
OUT2
, where R
OUT1
is
the output resistance of the first stage and R
OUT2
is the
output resistance of the second stage. A typical value
for a two-stage voltage doubler is 60
(with C1 at 10μF
for MAX1682 and 3.3μF for MAX1683). For n stages
with the same C1 value, R
OUT
= (2
n
- 1) x R
OUT1
.
Paralleling Devic es
Paralleling multiple MAX1682 or MAX1683s reduces
the output resistance. Each device requires its own
pump capacitor (C1), but the reservoir capacitor (C2)
serves all devices (Figure 4). Increase C2’s value by a
factor of n, where n is the number of parallel devices.
Figure 4 shows the equation for calculating output
resistance.
Layout and Grounding
Good layout is important, primarily for good noise per-
formance. To ensure good layout, mount all compo-
nents as close together as possible, keep traces short
to minimize parasitic inductance and capacitance, and
use a ground plane.
M
S witc hed-Capac itor Voltage Doublers
_______________________________________________________________________________________
7
MAX1682
MAX1683
GND
C1
C2
C2
C1+
IN
OUT
C1-
MAX1682
MAX1683
C1
C1+
INPUT
SUPPLY
VOLTAGE
OUTPUT
VOLTAGE
IN
OUT
GND
C1-
Figure 3. Cascading Devices
MAX1682
MAX1683
GND
R
= R
OUT
OF SINGLE DEVICE
NUMBER OF DEVICES
C2
C1+
IN
OUT
C1-
MAX1682
MAX1683
C1
C1
C1+
INPUT
SUPPLY
VOLTAGE
OUTPUT
VOLTAGE
IN
OUT
GND
C1-
Figure 4. Paralleling Devices
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| MAX1682 | Switched-Capacitor Voltage Doublers |
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