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參數(shù)資料
| 型號(hào)： | ADM8829 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Switched-Capacitor Voltage Inverter with Shutdown(帶關(guān)斷的開(kāi)關(guān)電容電壓反相器) |
| 中文描述： | 開(kāi)關(guān)電容電壓逆變器關(guān)斷（帶關(guān)斷的開(kāi)關(guān)電容電壓反相器） |
| 文件頁(yè)數(shù)： | 5/6頁(yè) |
| 文件大小： | 75K |
| 代理商： | ADM8829 |
ADM8828/ADM8829
–5–
REV. 0
GENERAL INFORMATION
The ADM8828/ADM8829 is a switched capacitor voltage con-
verter that can be used to invert the input supply voltage.
The voltage conversion task is achieved using a switched capaci-
tor technique using two external charge storage capacitors. An
on-chip oscillator and switching network transfers charge be-
tween the charge storage capacitors. The basic principle behind
the voltage conversion scheme is illustrated below.
S1
S2
S3
S4
+
+
CAP+
CAP–
C2
V+
OUT = –V+
2
OSCILLATOR
F
1
F
2
C1
Figure 11. Voltage Inversion Principle
An oscillator generating antiphase signals
φ
1 and
φ
2 controls
switches S1, S2 and S3, S4. During
φ
1, switches S1 and S2 are
closed while S3 and S4 are open, thereby charging C1 up to the
voltage at V+. During
φ
2, S1 and S2 open and S3 and S4 close.
The positive terminal of C1 is connected to GND via S3 during
this phase and the negative terminal of C1 connects to V
OUT
via S4. The net result is voltage inversion at V
OUT
wrt GND.
Charge on C1 is transferred to C2 during
φ
2. Capacitor C2
maintains this voltage during
φ
1. The charge transfer efficiency
depends on the on-resistance of the switches, the frequency at
which they are being switched and also on the equivalent series
resistance (ESR) of the external capacitors. For maximum effi-
ciency, capacitors with low ESR are, therefore, recommended.
Shutdown Input
The ADM8828 contains a shutdown input that can be used to
disable the device and hence reduce the power consumption. A
logic high level on the SHDN input shuts the device down re-
ducing the quiescent current to 0.02
μ
A. During shutdown the
output voltage discharges to 0 V. Therefore, ground refer-
enced loads are not powered during this state. When exiting
shutdown, it takes several cycles (approximately 175
μ
s) for the
charge pump to reach its final value. If the shutdown function is
not being used, SHDN should be hardwired to GND.
Capacitor Selection
The flying capacitor C1 can be increased to reduce the output
resistance.
The output capacitor size C2 affects the output ripple. Increas-
ing the capacitor size reduces the peak-peak ripple. The ESR
affects both the output impedance and the output ripple.
Reducing the ESR reduces the output impedance and ripple.
For convenience it is recommended that both C1 and C2 be the
same value.
The ac impedance of the ADM8828/ADM8829 may be reduced
by using a bypass capacitor on the input supply. This capacitor
should be connected between the input supply and GND. It will
provide instantaneous current surges as required. Suitable ca-
pacitors of 1
μ
F or greater may be used.
+
+
+1.5V TO +5.5V
INPUT
SHUTDOWN
CONTROL
C1
1
m
F
C2
1
m
F
INVERTED
NEGATIVE
OUTPUT
ADM8828/
ADM8829
CAP+
CAP–
GND
IN
SHDN
OUT
Figure 12. Typical Circuit Configuration
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