G5930 Global Mixed-mode Technology Inc. Switched Capacitor Voltage Inverter with Shutdown Features General Description 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 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 Cell Phone Small LCD Panels Portable Equipment Handy-Terminals, PDAs Battery-Operated Equipment 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 TEMP. RANGE PACKAGE (Pb free) G5930TBU 5930x -40°C to 85°C SOT-23-6 Note: TB : SOT23-6 U: Tape & Reel Pin Configuration Typical Application Circuit G5930 OUT 1 1 6 2 5 2 VIN (1.8V to 5V) SHDN 4 3 IN SHDN 5 OFF C3 C1- 6 C1+ C2 IN C1+ OUT 3 C1- GND ON 4 GND GND SOT-23-6 C1 C1,C2,C3: 1µF MLCC (X5R) TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.0 Sep 09, 2005 1 G5930 Global Mixed-mode Technology Inc. Absolute Maximum Ratings Storage Temperature………….…………-65°C to 150°C Junction Temperature…………………..…………150°C Reflow Temperature (soldering, 10sec)…...……260°C Continuous Power Dissipation (TA=70°C) SOT-23-6 (derate 8.7mW/°C above 70°C…….696mW ESD Rating HBM……………………….…………2000V 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 SHDN to GND Voltage Range…… -0.3V to (VIN+0.3V) Operating Temperature Range….………-40°C to 85°C OUT Short Circuit to GND.........………………Indefinite Note: Human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin. Electrical Characteristics (VIN=+3.3V, C1 = C2 = C3= 1µF, TA= -40 to 85°C unless otherwise noted. Typical values is at TA=25°C.) PARAMETER CONDITION MIN TYP MAX UNIT 1.8 --- 5 V --200 0.45 270 0.55 330 ILOAD=10mA --- 8.3 --- mA KHz Ω Voltage Conversion Efficiency ILOAD=5mA ILOAD=25mA No Load ----99 14 56 --- ------- mV p-p mV p-p % Power Efficiency ILOAD=5mA Input Voltage, VIN Supply Current, IQ Charge Pump Frequency, FSW RLOAD=10kΩ Output Resistance(Note) Output Ripple o TA=25 C VIN=5V --- 93 --- % SHDN Input Logic High 0.7xVIN --- --- V SHDN Input Logic Low --- --- 0.2 V Electrical Characteristics (VIN=+5V, C1 = C2 = C3= 1µF, TA= -40 to 85°C unless otherwise noted. Typical values is at TA=25°C.) PARAMETER MIN TYP MAX UNIT TA=25oC VIN=5V ILOAD=10mA ILOAD=5mA --------- 0.92 260 8.8 25 1.1 ------- mA KHz Ω mV p-p Voltage Conversion Efficiency ILOAD=25mA No Load --99 100 --- ----- mV p-p % Power Efficiency ILOAD=10mA --- 90 --- % SHDN Input Logic High 0.7xVIN --- --- V SHDN Input Logic Low --- --- 0.2 V Supply Current, IQ Charge Pump Frequency, FSW Output Resistance(Note) Output Ripple CONDITION Note: Capacitor contribution (ESR component plus (1/FSW)・C) is approximately 20% of output. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.0 Sep 09, 2005 2 G5930 Global Mixed-mode Technology Inc. Typical Performance Characteristics (VIN=3.3V, C1=C2=C3=1µF, TA=25°C, unless otherwise noted.) Output Voltage vs Output Current at VIN=+5V Output Voltage vs. Current 0 V IN=2.0V -1 -2 Output Voltage (V) Output Voltage (V) V IN=1.8V V IN=2.5V -3 V IN=3.3V -4 V IN=3.6V -5 V IN=5.0V -6 0 5 10 15 20 25 30 35 40 45 50 55 -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 C1=1μF C1=2.2μF C1=10μF 0 60 20 40 60 80 100 120 140 160 180 200 220 240 260 Output Current (mA) Output Current (mA) Output Resistance vs. Input Voltage Output Voltage v s. Tempe rature 0 10 -0.5 9 IOUT =0mA -1 8 Output Resistance (Ω) -1.5 Output Voltage (V) C1=4.7μF -2 -2.5 V IN=3.3V -3 -3.5 -4 -4.5 7 6 5 4 3 2 V IN=5.0V 1 -5 -5.5 0 -40 -20 0 20 40 Temperature (°C) 60 80 100 1.8 2.2 2.6 3 3.4 3.8 4.2 4.6 5 Input Voltage (V) Output Resistance vs. Temperature Frequency vs. Input Voltage 350 10 V IN=1.8V 9.5 300 Frequency (kHz) Output Resistance (Ω) 250 V IN=5.0V 9 8.5 V IN=3.3V 8 200 150 100 V IN=2.0V 7.5 50 7 0 -40 -20 0 20 40 60 80 100 1.8 Temperature (°C) 2.2 2.6 3 3.4 3.8 4.2 4.6 5 Input Voltage (V) TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.0 Sep 09, 2005 3 G5930 Global Mixed-mode Technology Inc. Typical Performance Characteristics (continued) Frequency vs. Temperature Supply Current vs. Input Voltage 1 350 0.9 300 0.8 Supply Current (mA) Frequency (kHz) 250 200 150 100 0.7 0.6 0.5 0.4 0.3 0.2 50 0.1 0 -40 0 -20 0 20 40 60 80 1.8 100 2.2 2.6 3 3.4 3.8 Input Voltage (V) Temperature (°C) 100 0.45 95 0.4 90 0.35 85 0.3 80 Efficiency (%) Supply Current (mA) 4.6 5 Efficiency vs. Output Current Supply Current vs. Temperature 0.5 0.25 0.2 V IN=1.8V V IN=3.6V V IN=2.5V V IN=2.0V 75 65 0.1 60 0.05 55 V IN=5.0V V IN=3.3V 70 0.15 0 -40 4.2 50 -20 0 20 40 60 80 0 100 5 10 15 20 25 30 35 40 45 50 55 Temperature ( °C) Output Current (mA) Output Ripple Waveform at VIN=+3.3V Output Ripple Waveform at VIN=+5V 60 TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.0 Sep 09, 2005 4 Global Mixed-mode Technology Inc. G5930 Typical Performance Characteristics (continued) Startup From Shutdown-3.3V Startup From Shutdown-5V Recommended Minimum Footprint SOT-23-6 TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.0 Sep 09, 2005 5 G5930 Global Mixed-mode Technology Inc. Pin Descriptions PIN NAME 1 2 OUT IN Inverting Charge-Pump Output Power-Supply Positive Voltage Input FUNCTION 3 4 C1GND 5 SHDN Flying Capacitor’s Negative Terminal Ground Inverting Shutdown Input 6 C1+ Flying Capacitor’s Positive Terminal Detailed Description 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: 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. ROUT ≅ 2RSW + 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. 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. 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 S1 S2 IN C1 C2 S3 S4 VOUT=-(VIN) Figure 1. Ideal Voltage Inverter TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.0 Sep 09, 2005 6 G5930 Global Mixed-mode Technology Inc. Application Information 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 Table 1. Low-ESR Capacitor Manufacturers PRODUCTION METHOD MANUFACTURER SERIES Surface-Mount Ceramic AVX Matsuo X7R X7R 2 η= 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. 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. 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. 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. 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: VRIPPLE = IL f OSC xC2 IL R L POUT = 2 2 PIN IL R L + IL R OUT + I Q ( VIN ) 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. + 2xIL + ESR C2 C1 1µF 2 6 + C1+ 3 C1- IN C3 1µF OUT G5930 ON OFF 5 SHDN 1 RL NEGATIVE OUTPUT -1 x VIN C2 + 1µF GND 4 Figure 2. Typical Application Circuit TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.0 Sep 09, 2005 7 G5930 Global Mixed-mode Technology Inc. Package Information C D L H E θ1 e1 e A A2 A1 b 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 MIN DIMENSIONS IN MILLIMETER NOM MAX A A1 1.00 0.00 1.10 ----- 1.30 0.10 A2 b C D E 0.70 0.35 0.10 2.70 1.40 0.80 0.40 0.15 2.90 1.60 0.90 0.50 0.25 3.10 1.80 e e1 H L θ1 --------2.60 0.37 1.90(TYP) 0.95 2.80 ------ --------3.00 ----- 1º 5º 9º Taping Specification PACKAGE Q’TY/REEL SOT-23-6 3,000 ea 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. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.0 Sep 09, 2005 8