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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
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 output supply. The devices is ideal for both battery- powered 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.
Applications
Cell Phone Small LCD Panels Portable Equipment Handy-Terminals, PDAs Battery-Operated Equipment
Ordering Information
ORDER NUMBER
G5930TBU
MARKING
5930x
TEMP. RANGE
-40C to 85C
PACKAGE (Pb free)
SOT-23-6
Note: TB : SOT23-6
U: Tape & Reel
Pin Configuration
Typical Application Circuit
G5930
OUT 1 6 C1+ C2 VIN (1.8V to 5V) C3 C13 4 GND
1
OUT
C1+
6
2
IN
SHDN
5 OFF ON
IN
2
5
SHDN
3
C1-
GND
4
GND
SOT-23-6
C1 C1,C2,C3: 1F MLCC (X5R)
Ver: 1.0 Sep 09, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Absolute Maximum Ratings
IN to GND Voltage Range...................-0.3V to +5.5V OUT to GND Voltage Range................-5.5V to +0.3V C1+ to GND Voltage Range...........-0.3V to (VIN+0.3V) C1- to GND Voltage Range.........(VOUT -0.3V) to +0.3V
G5930
SHDN to GND Voltage Range...... -0.3V to (VIN+0.3V)
Operating Temperature Range.............-40C to 85C OUT Short Circuit to GND...........................Indefinite
Storage Temperature.........................-65C to 150C Junction Temperature...................................150C Reflow Temperature (soldering, 10sec)............260C Continuous Power Dissipation (TA=70C) SOT-23-6 (derate 8.7mW/C above 70C.......696mW ESD Rating HBM........................................2000V
Note: Human body model is a 100pF capacitor discharged through a 1.5k resistor into each pin.
Electrical Characteristics
(VIN=+3.3V, C1 = C2 = C3= 1F, TA= -40 to 85C unless otherwise noted. Typical values is at TA=25C.) PARAMETER
Input Voltage, VIN Supply Current, IQ Charge Pump Frequency, FSW Output Resistance(Note) Output Ripple Voltage Conversion Efficiency Power Efficiency
SHDN Input Logic High SHDN Input Logic Low
CONDITION
RLOAD=10k TA=25 C VIN=5V ILOAD=10mA ILOAD=5mA ILOAD=25mA No Load ILOAD=5mA
o
MIN
1.8 --200 ------99 --0.7xVIN ---
TYP
--0.45 270 8.3 14 56 --93 -----
MAX
5 0.55 330 ------------0.2
UNIT
V mA KHz mV p-p mV p-p % % V V
Electrical Characteristics
(VIN=+5V, C1 = C2 = C3= 1F, TA= -40 to 85C unless otherwise noted. Typical values is at TA=25C.) PARAMETER
Supply Current, IQ Charge Pump Frequency, FSW Output Resistance(Note) Output Ripple Voltage Conversion Efficiency Power Efficiency
SHDN Input Logic High SHDN Input Logic Low
CONDITION
TA=25oC VIN=5V ILOAD=10mA ILOAD=5mA ILOAD=25mA No Load ILOAD=10mA
MIN
----------99 --0.7xVIN ---
TYP
0.92 260 8.8 25 100 --90 -----
MAX
1.1 --------------0.2
UNIT
mA KHz mV p-p mV p-p % % V V
Note: Capacitor contribution (ESR component plus (1/FSW)C) is approximately 20% of output.
Ver: 1.0 Sep 09, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(VIN=3.3V, C1=C2=C3=1F, TA=25C, unless otherwise noted.)
G5930
Output Voltage vs Output Current at VIN=+5V
Output Voltage vs. Current
0 V IN=2.0V V IN=1.8V
Output Voltage (V) Output Voltage (V)
-1
-2 V IN=2.5V
-3
-4
V IN=3.3V
V IN=3.6V
-5 V IN=5.0V -6 0 5 10 15 20 25 30 35 40 45 50 55 60 Output Current (mA)
-2.9 -3 -3.1 -3.2 -3.3 -3.4 -3.5 -3.6 -3.7 -3.8 -3.9 -4 -4.1 -4.2 -4.3 -4.4 -4.5 -4.6 -4.7 -4.8 -4.9 -5 0
C1=1F
C1=2.2F
C1=4.7F
C1=10F
20 40 60 80 100 120 140 160 180 200 220 240 260 Output Current (mA)
Output Voltage v s. Tempe rature
0 -0.5 -1 -1.5
Output Voltage (V)
Output Resistance vs. Input Voltage
10 9
IOUT =0mA
8
Output Resistance ()
7 6 5 4 3 2 1 0
-2 -2.5 -3 -3.5 -4 -4.5 -5 -5.5 -40 -20 0 20 40 Temperature (C) 60 80 100 V IN=5.0V V IN=3.3V
1.8
2.2
2.6
3
3.4
3.8
4.2
4.6
5
Input Voltage (V)
Output Resistance vs. Temperature
10 V IN=1.8V 350 300 250
Output Resistance () Frequency (kHz)
Frequency vs. Input Voltage
9.5
9
V IN=5.0V
200 150 100 50 0
8.5 V IN=3.3V 8 V IN=2.0V 7.5
7 -40 -20 0 20 40 60 80 100 Temperature (C)
1.8
2.2
2.6
3
3.4
3.8
4.2
4.6
5
Input Voltage (V)
Ver: 1.0 Sep 09, 2005
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
G5930
Supply Current vs. Input Voltage
Frequency vs. Temperature
350 300 250
Frequency (kHz)
1 0.9 0.8
Supply Current (mA)
0.7 0.6 0.5 0.4 0.3 0.2
200 150 100 50 0 -40
0.1 0 -20 0 20 40 60 80 100 1.8 2.2 2.6 Temperature (C) 3 3.4 3.8 Input Voltage (V) 4.2 4.6 5
Supply Current vs. Temperature
0.5 0.45 0.4
Supply Current (mA)
Efficiency vs. Output Current
100 95 90 85
Efficiency (%)
0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 -40
V IN=1.8V V IN=2.5V V IN=2.0V V IN=3.3V
80 75 70 65 60 55 50
V IN=3.6V V IN=5.0V
-20
0
20
40
60
80
100
0
5
10 15
20
25
30 35
40
45
50 55
60
Temperature ( C)
Output Current (mA)
Output Ripple Waveform at VIN=+3.3V
Output Ripple Waveform at VIN=+5V
Ver: 1.0 Sep 09, 2005
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
Startup From Shutdown-3.3V
G5930
Startup From Shutdown-5V
Recommended Minimum Footprint
SOT-23-6
Ver: 1.0 Sep 09, 2005
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Global Mixed-mode Technology Inc.
Pin Descriptions
PIN
1 2 3 4 5 6
G5930
NAME
OUT IN C1GND
SHDN
FUNCTION
Inverting Charge-Pump Output Power-Supply Positive Voltage Input Flying Capacitor's Negative Terminal Ground Inverting Shutdown Input Flying Capacitor's Positive Terminal
C1+
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 conversion scheme. When S1 and S3 are closed, C1 charges to the supply voltage VIN. During this time interval, 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 1A. Besides, the OUT is activiely pulled to ground. The main application of G5930 is to generate a negative supply voltage. The range of the input supply voltage 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 output current, the effect of the ESR of the pumping capacitor C1 will be multiplied by four in the output resistance. The output capacitor C2 is charging and discharging 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 + 4ESRC1 + ESRC2 fOSCxC1
Where RSW is the sum of the ON resistance of the internal MOSFET switches shown in Figure 1. High capacitance, low ESR capacitors will reduce the output resistance.
S1 IN C1
S2
C2 S3 S4 VOUT=-(VIN)
Figure 1. Ideal Voltage Inverter
Ver: 1.0 Sep 09, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Application Information
Table 1. Low-ESR Capacitor Manufacturers PRODUCTION METHOD
Surface-Mount Ceramic
G5930
MANUFACTURER
AVX Matsuo
SERIES
X7R X7R
The output resistance is dependent on the capacitance and ESR values of the external capacitors. The output voltage drop is the load current times the output resistance, and the power efficiency is
=
Capacitor Selection To maintain the lowest output resistance, use capacitors with low ESR (Table 1). The charge-pump output resistance is a function of C1's and C2's ESR. Therefore, minimizing the charge-pump capacitor's ESR minimizes the total output resistance. Flying Capacitor (C1) Increasing the flying capacitor's value reduces the output resistance. Above a certain point, increasing C1's capacitance has a negligible effect because the output resistance becomes dominated by the internal switch resistance and capacitor ESR. Output Capacitor (C2) Increasing the output capacitor's value reduces the output ripple voltage. Decreasing its ESR reduces both output resistance and ripple. Lower capacitance values can be used with light loads if higher output ripple can be tolerated. Use the following equation to calculate the peak-to-peak ripple:
IL R L POUT =2 2 PIN IL R L + IL R OUT + I Q ( VIN )
2
Where IQ(VIN) is the quiescent power loss of the IC device,and IL2Rout is the conversion loss associated with the switch on-resistance, the two external capacitors and their ESRs. Input Bypass Capacitor (C3) Bypass the incoming supply to reduce its AC impedance and the impact of the G5930's switching noise. A bypass capacitor with a value equal to that of C1 is recommended. Voltage Inverter The most common application for these devices is a charge-pump voltage inverter (Figure 2). This application requires only two external components-- capacitors C1 and C2--plus a bypass capacitor, if necessary. Layout and Grounding Good layout is important, primarily for good noise performance. To ensure good layout, mount all components as close together as possible, keep traces short to minimize parasitic inductance and capacitance, and use a ground plane.
VRIPPLE =
IL f OSC xC2
+ 2xIL + ESR C2
C1 1F 6+ C1+ IN 3 C1OUT
2 C3 1F ON OFF 5
1 RL
G5930
SHDN GND 4
NEGATIVE OUTPUT -1 x VIN C2 + 1F
Figure 2. Typical Application Circuit
Ver: 1.0 Sep 09, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Package Information
G5930
C L
D
E
H
e1 e
1
A2 b
A A1
Note: 1. Package body sizes exclude mold flash protrusions or gate burrs 2. Tolerance 0.1000 mm (4mil) unless otherwise specified 3. Coplanarity: 0.1000mm 4. Dimension L is measured in gage plane SYMBOL
A A1 A2 b C D E e e1 H L 1
MIN
1.00 0.00 0.70 0.35 0.10 2.70 1.40 --------2.60 0.37 1
DIMENSIONS IN MILLIMETER NOM
1.10 ----0.80 0.40 0.15 2.90 1.60 1.90(TYP) 0.95 2.80 -----5
MAX
1.30 0.10 0.90 0.50 0.25 3.10 1.80 --------3.00 ----9
Taping Specification
PACKAGE
SOT-23-6
Feed Direction SOT- 23-6 Package Orientation
GMT Inc. does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications.
Q'TY/REEL
3,000 ea
Ver: 1.0 Sep 09, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
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