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參數(shù)資料
| 型號： | MAX681EPD |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 8-Bit Shift Registers With Output Latches 16-CFP -55 to 125 |
| 中文描述： | SWITCHED CAPACITOR CONVERTER, 8 kHz SWITCHING FREQ-MAX, PDIP14 |
| 封裝： | PLASTIC, DIP-14 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大小： | 84K |
| 代理商： | MAX681EPD |
Paralleling Devic es
Paralleling multiple MAX680/MAX681s reduces the out-
put resistance of both the positive and negative con-
verters. The effective output resistance is the output
resistance of a single device divided by the number of
devices. As Figure 4 shows, each MAX680 requires
separate pump capacitors C1 and C2, but all can
share a single set of reservoir capacitors.
±5V Regulated S upplies from
a S ingle 3V Battery
Figure 5 shows a complete ±5V power supply using one
3V battery. The MAX680/MAX681 provide +6V at V+,
which is regulated to +5V by the MAX666, and -6V,
which is regulated to -5V by the MAX664. The MAX666
and MAX664 are pretrimmed at wafer sort and require
no external setting resistors, minimizing part count. The
combined quiescent current of the MAX680/MAX681,
MAX663, and MAX664 is less than 500μA, while the out-
put current capability is 5mA. The MAX680/MAX681
input can vary from 3V to 6V without affecting regulation
appreciably. With higher input voltage, more current can
be drawn from the MAX680/MAX681 outputs. With 5V at
V
CC
, 10mA can be drawn from both regulated outputs
simultaneously. Assuming 150
source resistance for
both converters, with (I
L+
+ I
L-
) = 20mA, the positive
charge pump will droop 3V, providing +7V for the nega-
tive charge pump. The negative charge pump will droop
another 1.5V due to its 10mA load, leaving -5.5V at V-
sufficient to maintain regulation for the MAX664 at this
current.
M
+5V to ±10V Voltage Converters
_______________________________________________________________________________________
7
MAX680
100
μ
F
10
μ
F
0.1
μ
F
100
μ
F
100
μ
F
+12V TO+6V
-12V TO-6V
0.1
μ
F
10
μ
F
100
μ
F
C1+
GND
V
CC
C1-
C2+
C2-
V+
LBI
LOW-BATTERY
WARNING AT 3.5V
SENSE
VOUT
VIN
6V TO3V
2M
1.2M
+5V
-5V
GND
LBO
SDN
GND
VSET
V-
MAX666
V
IN
VOUT1
VOUT2
SENSE
SDN
GND
V
SET
MAX664
Figure 5. Regulated +5V and -5V from a Single Battery
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