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Global Mixed-mode Technology Inc.
G5931
Switched-Capacitor Voltage Inverters with Shutdown
Features
Inverts Input Supply Voltage 25mA Output Current with A Voltage Drop of 250mV 0.45mA Quiescent Current at 3.3V Supply 99% Voltage Conversion Efficiency 1.8V to 5V operating range Require Only Two Capacitors Over-Temperature Protected 2KV ESD Rating 8-Pin SOP Package
General Description
The G5931 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 G5931 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 8-pin SOP Package.
Applications
Cell Phone Small LCD Panels Portable Equipment Handy-Terminals, PDAs Battery-Operated Equipment
Ordering Information
ORDER NUMBER
G5931P1U
MARKING
G5931
TEMP. RANGE
-40C to 85C
PACKAGE (Pb free)
SOP-8
Note: P1 : SOP-8
U: Tape & Reel
Pin Configuration
Typical Operating Circuit
G5931
NC CP+ GND CP1 2 3 4 8 7 6 5 IN NC NC OUT C1
1 2
NC CP+ GND
IN NC NC
8
VIN (1.8V to 5V) C3
7 6 5 C2
3
4
CP-
OUT
SOP-8
C1,C2,C3: 1F MLCC (X5R)
Ver: 0.2 Preliminary Jun 22, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
1
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 OUT Output Current....................................100mA Operating Temperature Range.............-40C to 85C OUT Short Circuit to GND............................Indifinite
G5931
Storage Temperature........................-65C to 150C Junction Temperature...................................150C Reflow Temperature (Soldering, 10sec)...........260C Thermal Resistance SOIC (JA).............................................160C/W 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 RLOAD=10k TA=25 C VIN=5V ILOAD=5mA ILOAD=5mA ILOAD=25mA No Load ILOAD=5mA
o
CONDITION
MIN
1.8 --255 ------99 ---
TYP
--0.45 295 8.3 14 56 --93
MAX
5 0.5 330 9.6 ---------
UNIT
V mA KHz mV p-p mV p-p % %
Electrical Characteristics
(VIN=+5V, 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 RLOAD=10k TA=25oC VIN=5V ILOAD=5mA ILOAD=5mA ILOAD=25mA No Load
CONDITION
MIN
1.8 ----------99
TYP
--0.92 290 8.8 25 100 --90
MAX
5 ---------------
UNIT
V mA KHz mV p-p mV p-p % %
Power Efficiency ILOAD=10mA --Note: Capacitor contribution (ESR component plus (1/FSW)C) is approximately 20% of output.
Ver: 0.2 Preliminary Jun 22, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
2
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(VIN=3.3V, C1=C2=C3=1F, TA=25C, unless otherwise noted.)
G5931
Output Voltage vs. Temperature
Output Voltage vs. Current
0 -1 Output Voltage (V) -2 VIN=2.5V -3 -4 -5 VIN=5.0V -6 0 5 10 15 20 25 30 35 40 45 50 55 60 Output Current (mA) VIN=3.3V VIN=2.0V
-1 -1.5
VIN=1.8V
VOUT=-3.3V IOUT=0mA
Output Voltage (V)
-2 -2.5 -3
VIN=3.6V
-3.5 -4 -40
-20
0
20
40
60
80
100
Temperature (C)
10 9 8 Output Resistance () 7 6 5 4 3 2 1 0
Output Resistance vs. Input Voltage
10
Output Resistance vs. Temperature
9.5 Output Resistance ()
VIN=2.0V
9
8.5
VIN=1.8V
8
7.5
VIN=3.3V
1.8
2.2
2.6
3
3.4
3.8
4.2
4.6
5
7 -40
-20
0
Input Voltage (V)
20 40 Temperature (C)
60
80
100
Frequency vs. Input Voltage
350 300 250 Frequency (kHz) Frequency (kHz) 200 150 100 50 0 1.8 2.2 2.6 3 3.4 3.8 4.2 4.6 5 Input Voltage (V) 350 300 250 200 150 100 50 0 -40
Frequency vs. Temperature
-20
0
20
40
60
80
100
Temperature (C)
Ver: 0.2 Preliminary Jun 22, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
Supply Current vs. Input Voltage
1 0.9 0.8 Supply Current (mA) Supply Current (mA) 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 1.8 2.2 2.6 3 3.4 3.8 Input Voltage (V) 4.2 4.6 5
G5931
Supply Current vs. Temperature
0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 -40
-20
0
20
40
60
80
100
Temperature ( C)
Efficiency vs. Output Current
100 95 90 85 Efficiency (%) 80 75 70 65 60 55 50 0 5 10 15 20 25 30 35 40 45 50 55 60 Output Current (mA) VIN=1.8V VIN=2.5V VIN=2.0V VIN=3.3V VIN=3.6V VIN=5.0V
Output Ripple Waveform
Recommended Minimum Footprint
SOP-8
Ver: 0.2 Preliminary Jun 22, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
4
Global Mixed-mode Technology Inc.
Pin Descriptions
PIN
1,6,7 2 3 4 5 8
G5931
NAME
NC C1+ GND C1OUT IN Not Internally Connected Flying Capacitor's Positive Terminal Ground Flying Capacitor's Negative Terminal Inverting Charge-Pump Output Power-Supply Positive Voltage Input
FUNCTION
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 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 main application of G5931 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: 0.2 Preliminary Jun 22, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
5
Global Mixed-mode Technology Inc.
Application Information
Table 1. Low-ESR Capacitor Manufacturers PRODUCTION METHOD
Surface-Mount Ceramic
G5931
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 G5931'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 2+ C1+ IN NC NC NC 4 C1OUT
8 C3 1F 1 6 7
5 RL
G5931
GND 3
NEGATIVE OUTPUT -1 x VIN 25mA C2 + 1F
Figure 2. Typical Application Circuit
Ver: 0.2 Preliminary Jun 22, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
6
Global Mixed-mode Technology Inc.
Package Information
0.008TYP
G5931
E
H
L D
0.015x45
A2 0.004MAX. B A1
A
SEATING PLANE
e
SOP-8 Package Note: 1. JEDEC Outline: MS-012 AA/E.P. Version: N/A 2. Dimension "D" does not include mold flash, protrusions or gate burrs. Mold flash, protrusions and gate burrs shall not exceed .15mm (.006in) per side. 3. Dimensions "E" does not include inter-lead flash, or protrusions inter-lead flash and protrusions shall not exceed .25mm (.010in) per side.
SYMBOL
A A1 A2 B D E e H L
MIN.
1.35 0.00 -----
DIMENSION IN MM MAX.
1.75 0.13 1.50 0.41TYP 4.98 3.99 1.27TYP 6.20 1.27 8
DIMENSION IN INCH MIN. MAX.
0.053 0.000 ----0.016TYP 0.189 0.150 0.05TYP 0.228 0.016 0 0.244 0.050 8 0.196 0.157 0.069 0.005 0.059
4.80 3.81 5.80 0.41 0
Taping Specification
PACKAGE
SOP-8
Feed Direction Typical SOP 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
2,500 ea
Ver: 0.2 Preliminary Jun 22, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
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