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參數(shù)資料
| 型號(hào)： | MAX680ESA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 8-Bit Binary Counters With Input Registers 16-CFP -55 to 125 |
| 中文描述： | SWITCHED CAPACITOR CONVERTER, 8 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, SOP-8 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 84K |
| 代理商： | MAX680ESA |
M
The MAX680/MAX681 are
not
voltage regulators: the
output source resistance of either charge pump is
approximately 150
at room temperature with V
CC
at
5V. Under light load with an input V
CC
of 5V, V+ will
approach +10V and V- will be at -10V. However
both
,
V+ and V- will droop toward GND as the current drawn
from
either
V+ or V- increases, since the negative con-
verter draws its power from the positive converter’s out-
put. To predict output voltages, treat the chips as two
separate converters and analyze them separately. First,
the droop of the negative supply (V
DROP-
) equals the
current drawn from V- - (I
L-
) times the source resistance
of the negative converter (RS-):
V
DROP
- = I
L
- x RS-
Likewise, the positive supply droop (V
DROP+
) equals
the current drawn from the positive supply (I
L+
) times
the positive converter’s source resistance (RS+),
except that the current drawn from the positive supply
is the sum of the current drawn by the load on the posi-
tive supply (I
L+
) plus the current drawn by the negative
converter (I
L-
):
(V
DROP
+) = I
L
+ x RS+ = (I
L
+ + I
L
-) x RS+
The positive output voltage will be:
V+ = 2V
CC
– V
DROP
+
The negative output voltage will be:
V- = (V+ - V
DROP
) = - (2V
CC
- V
DROP
+ - V
DROP
-)
The positive and negative charge pumps are tested
and specified separately to provide the separate values
of output source resistance for use in the above formu-
las. When the positive charge pump is tested, the neg-
ative charge pump is unloaded. When the negative
charge pump is tested, the positive supply V+ is from
pump.
Calculate the ripple voltage on either output by noting
that the current drawn from the output is supplied by
the reservoir capacitor alone during one half-cycle of
the clock. This results in a ripple of:
V
RIPPLE
=
1
2
IOUT (
1
f
PUMP
)(
1
CR)
For the nominal f
PUMP
of 8kHz with 10μF reservoir
capacitors, the ripple will be 30mV with I
OUT
at 5mA.
Remember that in most applications, the positive
charge pump’s I
OUT
is the load current
plus
the current
taken by the negative charge pump.
+5V to ±10V Voltage Converters
6
_______________________________________________________________________________________
MAX680
22
μ
F
22
μ
F
C1-
8
7
6
5
C2+
V-
V+
1
2
3
4
C1+
V
CC
GND
C2-
MAX680
22
μ
F
22
μ
F
22
μ
F
V+ OUT
V- OUT
V
CC
IN
GND
22
μ
F
C1-
8
7
6
5
C2+
V-
V+
1
2
3
4
C1+
V
CC
GND
C2-
Figure 4. Paralleling MAX680s For Lower Source Resistance
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX681CPD | 8-Bit Shift Registers With Output Latches 16-CDIP -55 to 125 |
| MAX681EPD | 8-Bit Shift Registers With Output Latches 16-CFP -55 to 125 |
| MAX687_8_9 | |
| MAX687-MAX689 | High-Accuracy, Low-Dropout Linear Regulators |
| MAX689CPA | ER 4C 4#2 SKT RECP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX680ESA+ | 功能描述:電荷泵 5V to +/-10V Voltage Converter RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX680ESA+T | 功能描述:電荷泵 5V to +/-10V Voltage Converter RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX680ESA-T | 功能描述:電荷泵 5V to +/-10V Voltage Converter RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX680MJA | 功能描述:電荷泵 RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX680MJA/883B | 功能描述:電荷泵 RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
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