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參數(shù)資料
| 型號(hào)： | MAX1680 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters |
| 中文描述： | 125mA、頻率可選、開(kāi)關(guān)電容電壓變換器 |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大小： | 103K |
| 代理商： | MAX1680 |
M
Bypass Capac itor
Bypass the input voltage to reduce AC impedance and
to prevent internal switching noise. Bypassing depends
on the source impedance location. The AC ripple cur-
rent is 2 x I
OUT
for the doubler and the inverter. Use a
large bypass capacitor (equal to C1) if the supply has
high AC impedance.
Casc ading Devic es
To produce larger negative voltages, cascade two
devices (Figure 1). For two devices, the unloaded out-
put voltage is approximately -2 x V
INPUT
, but this value
is reduced slightly by the first device’s output resis-
tance multiplied by the second device’s quiescent cur-
rent. The effective output resistance for a cascaded
device is larger than that for an individual device (20
for two devices). Cascading several devices increases
output resistance and reduces efficiency. If a large
negative voltage is required for several stages, an
inductive inverting switching regulator such as the
MAX629 or MAX774 may offer more advantages.
Paralleling Devic es
Parallel two or more MAX1680/MAX1681s to reduce
output resistance voltage drop under a given load. With
reduced output resistance, paralleled devices deliver
higher load currents. Figure 2 shows two
MAX1680/MAX1681s connected in parallel. Output
resistance is inversely proportional to the number of
devices.
125mA, Frequenc y-S elec table,
S witc hed-Capac itor Voltage Converters
8
_______________________________________________________________________________________
250
500
1000
1.2
0.6
0.3
125
2.5
1.9
0.9
0.4
3.8
Table 4. Minimum Recommended Capacitances for Maximum Output Current
CAPACITANCE (μF) (C1 = C2)
V
IN
= 3V
2.5
1.2
0.6
5.1
3.2
1.6
0.8
6.4
f
OSC
(kHz)
V
IN
= 2V
V
IN
= 5V
V
IN
= 4V
MAX1681
GND
FSEL
IN
CAP+
SHDN
1
μ
F
1
μ
F
1
μ
F
LV
CAP-
OUT
MAX1681
FSEL
IN
CAP+
SHDN
GND
+V
INPUT
V
OUT
= -V
INPUT
1
μ
F
NOTE: USE 4.7
μ
F CAPACITORS FOR MAX1680.
1
μ
F
LV
CAP-
OUT
V
OUT
= -2V
INPUT
Figure 1. Cascading MAX1680/MAX1681s to Increase Output Voltage
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1680ESA | 125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters |
| MAX1681ESA | 125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters |
| MAX1682EUK-T | Switched-Capacitor Voltage Doublers |
| MAX1682-MAX1683 | Switched-Capacitor Voltage Doublers |
| MAX1683EUK-T | Switched-Capacitor Voltage Doublers |
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