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參數(shù)資料
| 型號(hào)： | G5931 |
| 廠商： | Global Mixed-mode Technology Inc. |
| 英文描述： | Switched-Capacitor Voltage Inverters with Shutdown |
| 中文描述： | 開關(guān)電容電壓反相器，帶有關(guān)斷 |
| 文件頁(yè)數(shù)： | 5/7頁(yè) |
| 文件大?。?/td> | 180K |
| 代理商： | G5931 |
Ver: 0.2 Preliminary
Jun 22, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
5
G5931
Global Mixed-mode Technology Inc.
Pin Descriptions
PIN
NAME
FUNCTION
1,6,7
NC
Not Internally Connected
2
C1+
Flying Capacitor’s Positive Terminal
3
GND
Ground
4
C1-
Flying Capacitor’s Negative Terminal
5
OUT
Inverting Charge-Pump Output
8
IN
Power-Supply Positive Voltage Input
Detailed Description
The G5931 contains four large switches which are
switched in a sequence to inverter the input supply
voltage. Energy transfer and storage are provided by
external capacitors. Fig. 1 illustrates the voltage con-
version scheme. When S1 and S3 are closed, C1
charges to the supply voltage VIN. During this time in-
terval, switches S2 and S4 are open. In the second
time interval, S1 and S3 are open; at the same time,
S2 and S4 are closed, C1 is charging C2. After a
number of cycles, the voltage across C2 will be
pumped to VIN. Since the anode of C2 is connected to
ground, the output at the cathode of C2 equals -(VIN)
when there are no load current.
The main application of G5931 is to generate a nega-
tive supply voltage. The range of the input supply volt-
age is 1.8V to 5V. The output characteristics of this
circuit can be approximated by an ideal voltage source
in series with a resistance. The voltage source equals
-(VIN). The output resistance, Rout, is a function of the
ON resistance of the internal MOSFET switches, the
oscillator frequency, the capacitance and the ESR of
both C1 and C2. Since the switching current charging
and discharging C1 is approximately twice as the out-
put current, the effect of the ESR of the pumping ca-
pacitor C1 will be multiplied by four in the output resis-
tance. The output capacitor C2 is charging and dis-
charging at a current approximately equal to the output
current, therefore, this ESR term only counts once in
the output resistance. A good approximation of Rout is:
2
C
1
C
1
OSC
SW
OUT
ESR
4
xC
f
2
R
2
R
+
Where RSW is the sum of the ON resistance of the in-
ternal MOSFET switches shown in Figure 1.
High capacitance, low ESR capacitors will reduce the
output resistance.
Figure 1. Ideal Voltage Inverter
IN
S1
S2
C1
S3
S4
C2
V
OUT=-(VIN)
IN
S1
S2
C1
S3
S4
C2
V
OUT=-(VIN)
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