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Teilenummer | G5930TBU |
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Beschreibung | Switched Capacitor Voltage Inverter | |
Hersteller | Global Mixed-mode Technology | |
Logo | ||
Gesamt 8 Seiten Global Mixed-mode Technology Inc.
G5930
Switched Capacitor Voltage Inverter with Shutdown
Features
Inverts Input Supply Voltage
25mA Output Current with a Voltage Drop of
250mV
0.45mA Quiescent Current at 3.3V Supply Voltage
99% Voltage Conversion Efficiency
1.8V to 5V operating range
Require Only Two Capacitors
Over-Temperature Protection
Logic Controlled Shutdown
6-Pin SOT-23 Package
Applications
Cell Phone
Small LCD Panels
Portable Equipment
Handy-Terminals, PDAs
Battery-Operated Equipment
General Description
The G5930 is an unregulated charge-pump voltage
inverter which may be used to generate a negative
supply from positive input. Input voltages ranging from
+1.8V to +5V can be inverted into a -1.8V to -5V out-
put supply. The devices is ideal for both battery- pow-
ered and board level voltage conversion applications
with a typical operating current of 0.45mA at 3.3V
supply.
The G5930 can deliver 25mA output current with a
voltage drop of 250mV. The parts are over -temperature
protected.
Applications include cell phones, PDAs, and other
portable equipment. The devices is available in a
space-saving 6-pin SOT-23 Package.
Ordering Information
ORDER
NUMBER
MARKING
G5930TBU 5930x
Note: TB : SOT23-6
U: Tape & Reel
TEMP.
RANGE
-40°C to 85°C
PACKAGE
(Pb free)
SOT-23-6
Pin Configuration
Typical Application Circuit
OUT 1
G5930
6 C1+
IN 2
5 SHDN
C1- 3
SOT-23-6
4 GND
1
OUT
6
C1+
C2
VIN
(1.8V to 5V)
C3
2
IN
3
C1-
SHDN 5 ON
OFF
4
GND
GND
C1,C2,C3: 1µF MLCC (X5R)
C1
Ver: 1.0
Sep 09, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
1
Global Mixed-mode Technology Inc.
Pin Descriptions
PIN NAME
FUNCTION
1
OUT
Inverting Charge-Pump Output
2 IN Power-Supply Positive Voltage Input
3 C1- Flying Capacitor’s Negative Terminal
4
GND
Ground
5
SHDN
Inverting Shutdown Input
6 C1+ Flying Capacitor’s Positive Terminal
G5930
Detailed Description
The G5930 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 G5930 has a logical-controlled shutdown input.
Driving SHDN low places the G5930 in a low-power
shutdown mode, and the charge pump switching halts.
In the shutdown mode, supply current is smaller than
1µA. Besides, the OUT is activiely pulled to ground.
The main application of G5930 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:
ROUT
≅
2RSW
+
2
fOSCxC1
+
4ESRC1 + ESRC2
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.
S1
IN
S2
C1
C2
S3 S4
VOUT=-(VIN)
Ver: 1.0
Sep 09, 2005
Figure 1. Ideal Voltage Inverter
6
TEL: 886-3-5788833
http://www.gmt.com.tw
6 Page | ||
Seiten | Gesamt 8 Seiten | |
PDF Download | [ G5930TBU Schematic.PDF ] |
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