® SP6660 200mA Charge Pump Inverter or Doubler ■ Inverts or Doubles Input Supply Voltage ■ 93% Power Efficiency at 3.6V ■ 10kHz/80kHz Selectable Oscillator ■ External Oscillator up to 700KHz ■ 5Ω Output Resistance at 3.6V ■ Low Voltage Battery Operation ■ Ideal for 3.6V Lithium Ion Battery ■ High Output Current – 200mA ■ Pin-Compatible High-Current Upgrade of the ICL7660 and 660 Industry Standard ■ Smallest Package Available for the 660 Industry Standard – 8pin µSOIC DESCRIPTION The SP6660 is a CMOS DC-DC Monolithic Voltage Converter that can be implemented as a Voltage Inverter or a Positive Voltage Doubler. As a Voltage Inverter, a -1.5V to -4.25V output can be converted from a +1.5V to +4.25V input. As a Voltage Doubler, the SP6660 can provide a +8.0V output at 100mA from a +4.25V input. The SP6660 is ideal for both battery-powered and board level voltage conversion applications with a typical operating current of 400µA and a high efficiency (>90%) over most of its load-current range. Typical end products for this device are operational amplifier and interface power supplies, medical instruments, and handheld and laptop computers. The SP6660 is available in 8-pin DIP, SOIC, and µSOIC packages. +VIN +1.5V to +4.25V TYPICAL CIRCUIT: VOLTAGE INVERTER TYPICAL CIRCUIT: VOLTAGE DOUBLER +V 1 FC CAP+ GND 2 SP6660 8 +VIN +1.5V to +4.25V 7 OSC CAP+ LV 3 6 C1 1µF to 150µF GND CAP- 4 5 OUT 2 SP6660 7 6 CAP- 4 DOUBLE VOLTAGE OUTPUT 8 3 C1 1µF to 150µF NEGATIVE VOLTAGE OUTPUT +V 1 FC 5 OSC C2 1µF to 150µF LV OUT C2 1µF to 150µF SP6660DS/11 SP6660 200mA Charge Pump Inverter or Doubler 1 © Copyright 2000 Sipex Corporation ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. OUT and V+ Continuous Output Current.....................250mA Output Short-Circuit Duration to GND.................................1s Operating Temperature Ranges SP6660C_........................................0˚C to +70˚C SP6660E_.....................................-40˚C to +85˚C Continuous Power Dissipation (TAMB = 70˚C) PDIP (derate 9.09mW/˚C above +70˚C)..................727mW NSOIC (derate 5.88mW/˚C above +70˚C)...............471mW µSOIC (derate 4.10mW/˚C above +70˚C)................330mW Operating Temperature...................................-40˚C to +85˚C Storage Temperature....................................-65˚C to +150˚C Power Supply Voltage (V+ to GND or GND to OUT).........................................+4.5V LV Input Voltages........................(OUT - 0.3V) to (V+ + 0.3V) FC and OSC Input Voltages..................The least negative of (OUT - 0.3V) or (V+ - 4.5V) to (V+ + 0.3V) Lead Temperature (soldering 10s)..............................+300˚C SPECIFICATIONS PARAMETER MIN. TYP. MAX. UNITS CONDITIONS Inverter Circuit at Low Frequency with 150µF Capacitors V+ = 3.6V, C1 = C2 = 150µF, FC = open, TAMB = TMIN to TMAX; refer to Figure 1 test circuit. Note 2 Supply Voltage 1.5 Supply Current Output Current Power Efficiency V 0.4 0.8 mA 5 RL = 500Ω, Note 4 No Load mA ±1 Output Resistance Voltage Conversion Efficiency 4.25 200 Oscillator Input Current Oscillator Frequency 0.93 µA 10 20 kHz 5.2 10 Ω IL = 100mA, Note 3 99.00 99.96 % No Load 88 80 63 94 85 70 % RL = 500Ω IL = 100mA IL = 200mA Doubler Circuit at Low Frequency with 150µF Capacitors V+ = 3.6V, C1 = C2 = 150µF, FC = open, TAMB = TMIN to TMAX; refer to Figure 2 test circuit. Note 2 Supply Voltage 2.5 Supply Current Output Current Power Efficiency SP6660DS/11 V 0. 4 0.8 mA 5 RL = 1kΩ, Note 4 No Load mA ±1 Output Resistance Voltage Conversion Efficiency 4.25 200 Oscillator Input Current Oscillator Frequency 1.5 µA 10 20 kHz 5.2 10 Ω IL = 100mA, Note 3 99.00 99.96 % No Load 91 89 79 96 93 85 % RL = 1KΩ IL = 100mA IL = 200mA SP6660 200mA Charge Pump Inverter or Doubler 2 © Copyright 2000 Sipex Corporation SPECIFICATIONS (continued) PARAMETER MIN. TYP. MAX. UNITS CONDITIONS Inverter Circuit at High Frequency with 22µF Capacitors V+ = 3.6V, C1 = C2 = 22µF, FC = V+, TAMB = TMIN to TMAX; refer to Figure 1 test circuit. Note 2 Supply Voltage 1.5 Supply Current Output Current Power Efficiency V 0.6 1.5 mA 40 RL = 500Ω, Note 4 No Load mA ±8 Output Resistance Voltage Conversion Efficiency 4.25 200 Oscillator Input Current Oscillator Frequency 0.97 µA 80 160 kHz 5.0 10 Ω IL = 100mA, Note 3 99.00 99.96 % No Load 86 80 63 92 86 71 % RL = 500Ω IL = 100mA IL = 200mA Doubler Circuit at HIgh Frequency with 22µF Capacitors V+ = 3.6V, C1 = C2 = 22µF, FC = V+, TAMB = TMIN to TMAX; refer to Figure 2 test circuit. Note 2 Supply Voltage 2.5 Supply Current Output Current Power Efficiency V 0.6 1.5 mA 40 RL = 1kΩ, Note 4 No Load mA ±8 Output Resistance Voltage Conversion Efficiency 4.25 200 Oscillator Input Current Oscillator Frequency 1.6 µA 80 160 kHz 5.0 10 Ω IL = 100mA, Note 3 99.00 99.96 % No Load 90 89 79 94 93 85 % RL = 1KΩ IL = 100mA IL = 200mA NOTE 1: Specified output resistance is a combination of internal switch resistance and capacitor ESR. NOTE 2: In the test circuit capacitors C1 and C2 are 150µF, 0.2 maximum ESR, tantalum or 22µF, 0.2 maximum ESR, tantalum. Capacitors with higher ESR may reduce output voltage and efficiency. Refer to Capacitor Selection section. NOTE 3: Specified output resistance is a combination of internal switch resistance and capacitor ESR. Refer to Capacitor Selection section. NOTE 4: Typical value indicates start-up voltage. SP6660DS/11 SP6660 200mA Charge Pump Inverter or Doubler 3 © Copyright 2000 Sipex Corporation PINOUT 8 V+ FC 1 CAP+ 2 SP6660 6 LV GND 3 CAP- 7 OSC 4 5 OUT PIN ASSIGNMENTS Pin 1— FC — Frequency Control for the internal oscillator. FC = open,fOS C = 10KHz typical; FC = V+, fOSC = 80KHz typical Pin 5 — OUT — (Voltage Inverter Circuit) Negative voltage output pin. Pin 5 — OUT — (Positive Voltage Doubler Circuit) Ground pin for power supply. Pin 2 — CAP+ — Connect to the positive terminal of the charge pump capacitor. Pin 6 — LV Low-voltage operation input pin in 660 circuits. In SP6660 circuits can be connected to GND, OUT or left open as desired with no effect. Pin 3 — GND — (Voltage Inverter Circuit) Ground. Pin 3 — GND — (Positive Voltage Doubler Circuit) Positive supply voltage input. Pin 7 — OSC — Control pin for the oscillator. Internally connected to 15pf capacitor. An external capacitor can be added to slow the oscillator. Be careful to minimize stray capitance. An external oscillator can be connected to overdrive the OSC pin. Pin 4 — CAP- — Connect to the negative terminal of the charge pump capacitor. Pin 8 — V+ — (Voltage Inverter Circuit) Positive voltage input pin for the power supply. Pin 8 — V+ — (Positive Voltage Doubler Circuit) Positive voltage output. SP6660DS/11 SP6660 200mA Charge Pump Inverter or Doubler 4 © Copyright 2000 Sipex Corporation DESCRIPTION Typical performance curves in Figures 3 to 20 are generated using the test circuits found in Figure 1 and Figure 2. Four operating modes are shown in the curves: Voltage inverter in low and high frequency modes and voltage doubler in low and high frequency modes. The SP6660 Charge Pump DC-DC Voltage Converter either inverts or doubles the input voltage. As a negative voltage inverter, as shown in Figure 1, a +1.5V to +4.25V input can be converted to a -1.5V to -4.25V output. Figure 2, as a positive voltage doubler, a +2.5V to +4.25V input can be converted to a +5.0V to +8.5V output. TEST CIRCUIT: VOLTAGE INVERTER FC CAP+ C1 GND CAP- V+ 1 2 IS +VIN 8 SP6660 OSC 7 3 6 4 5 LV OUT VOUT IL C2 RL Figure 1. SP6660 Test Circuit for the Voltage Inverter +VIN IS TEST CIRCUIT: VOLTAGE DOUBLER FC +V 1 CAP+ GND 2 SP6660 7 3 6 C1 CAP- VOUT 8 5 4 OSC C2 RL LV OUT Figure 2. Test Circuit for the Positive Voltage Doubler SP6660DS/11 SP6660 200mA Charge Pump Inverter or Doubler 5 © Copyright 2000 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS 3A: Doubler 0.6 Supply Current (mA) VIN = +3.6V, TAMB = 25oC unless otherwise noted. LF = Low Frequency, FC = Open, C1 = C2 = 150µF. HF = High Frequency, FC = V+, C1 = C2 = 22µF. Inverter Circuit use Figure 1. Doubler Circuit use Figure 2. 0.5 HF LF 0.4 0.3 0.2 0.1 0 1.5 2 2.5 3 3.5 4 4.5 3B: Inverter 0.8 Supply Current (mA) Supply Voltage (V) 0.6 HF LF 0.4 0.2 0 1 1.5 2 2.5 3 3.5 4 4.5 Supply Voltage (V) Figure 3A and 3B Supply Current vs. Supply Voltage Supply Current (mA) 4 3 2 Inverter Doubler 1 0 1 10 100 1000 Oscillator Frequency (kHz) Figure 4. Supply Current vs. Oscillator Frequency SP6660DS/11 SP6660 200mA Charge Pump Inverter or Doubler 6 © Copyright 2000 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS VIN = +3.6V, TAMB = 25oC unless otherwise noted. LF = Low Frequency, FC = Open, C1 = C2 = 150µF. HF = High Frequency, FC = V+, C1 = C2 = 22µF. Inverter Circuit use Figure 1. Doubler Circuit use Figure 2. g 1.8 Voltage Drop (V) 1.6 1.4 1.2 1.0 0.8 0.6 V+ = 3.6V V+ = 2.5V V+ = 1.5V 0.4 0.2 0.0 0 50 100 150 Load Current (mA) 200 250 Figure 5. Output Voltage Drop vs. Load Current – Inverter LF Power Efficiency (%) 100 95 V+ = 3.6V V+ = 2.5V V+ = 1.5V 90 85 80 75 70 65 60 0 50 100 150 Load Current (mA) 200 250 Output Voltage (V) Figure 6. Power Efficiency vs. Load Current – Inverter LF -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 Inverter IL = 10mA Inverter IL = 100mA Inverter IL = 200mA Doubler IL = 10mA Doubler IL = 100mA Doubler IL = 200mA 1 10 100 Oscillator Frequency (kHz) 1000 Figure 7. Output Voltage vs. Oscillator Frequency SP6660DS/11 SP6660 200mA Charge Pump Inverter or Doubler 7 © Copyright 2000 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS VIN = +3.6V, TAMB = 25oC unless otherwise noted. LF = Low Frequency, FC = Open, C1 = C2 = 150µF. HF = High Frequency, FC = V+, C1 = C2 = 22µF. Inverter Circuit use Figure 1. Doubler Circuit use Figure 2. Power Efficiency (%) 100 90 Inverter IL = 10mA Inverter IL = 100mA Inverter IL = 200mA Doubler IL = 10mA Doubler IL = 100mA D bl IL 200 A 80 70 60 1 10 100 Oscillator Frequency (kHz) 1000 Figure 8. Power Efficiency vs. Oscillator Frequency 60 Oscillator Frequency (kHz) 50 40 30 20 10 0 1 1.5 2 2.5 3 3.5 4 4.5 Supply Voltage (V) Figure 9. Oscillator Frequency vs. Supply Voltage – HF 8 Oscillator Frequency (kHz) 6 4 2 0 1 1.5 2 2.5 3 Supply Voltage (V) 3.5 4 4.5 Figure 10. Oscillator Frequency vs. Supply Voltage – LF SP6660DS/11 SP6660 200mA Charge Pump Inverter or Doubler 8 © Copyright 2000 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS Oscillator Frequency (KHz) VIN = +3.6V, TAMB = 25oC unless otherwise noted. LF = Low Frequency, FC = Open, C1 = C2 = 150µF. HF = High Frequency, FC = V+, C1 = C2 = 22µF. Inverter Circuit use Figure 1. Doubler Circuit use Figure 2. 100 LF HF 10 1 0.1 0.01 1 10 100 1000 10000 Capacitance (pF) Oscillator Frequency (KHz) Figure 11. Oscillator Frequency vs. External Capacitance 60 40 20 0 -50 -25 0 25 Temperature (C) 50 75 100 25 50 Temperature (C) 75 100 Oscillator Frequency (KHz) Figure 12. Oscillator Frequency vs. Temperature where FC=V+ 7 6 5 4 3 2 1 0 -50 -25 0 Figure 13. Oscillator Frequency vs. Temperature where FC=open SP6660DS/11 SP6660 200mA Charge Pump Inverter or Doubler 9 © Copyright 2000 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS VIN = +3.6V, TAMB = 25oC unless otherwise noted. LF = Low Frequency, FC = Open, C1 = C2 = 150µF. HF = High Frequency, FC = V+, C1 = C2 = 22µF. Inverter Circuit use Figure 1. Doubler Circuit use Figure 2. Output Source Resistance (Ohms) 16.0 LF HF 12.0 8.0 4.0 0.0 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 Supply Voltage (V) Figure 14. Output Source Resistance vs. Supply Voltage Output Resistance (ohms) 7 6 5 4 3 2 1 0 -50 -25 0 25 50 75 100 50 75 100 Temperature (C) Figure 15. Output Source Resistance vs. Temperature Inverter LF Output Resistance (ohms) 7 6 5 4 3 2 1 0 -50 -25 0 25 Temperature (C) Figure 16. Output Source Resistance vs. Temperature where Inverter HF SP6660DS/11 SP6660 200mA Charge Pump Inverter or Doubler 10 © Copyright 2000 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS VIN = +3.6V, TAMB = 25oC unless otherwise noted. LF = Low Frequency, FC = Open, C1 = C2 = 150µF. HF = High Frequency, FC = V+, C1 = C2 = 22µF. Inverter Circuit use Figure 1. Doubler Circuit use Figure 2. VIN = 3.6V VOUT = 6.66V IL = 100mA VIN = 3.6V VOUT = -3.06V IL = 100mA Figure 18. Output Noise and Ripple - Inverter LF Figure 17. Output Noise and Ripple - Doubler LF VIN = 3.6V VOUT = 6.66V IL = 100mA VIN = 3.6V VOUT = -3.06V IL = 100mA Figure 19. Output Noise and Ripple - Doubler HF SP6660DS/11 Figure 20. Output Noise and Ripple - Inverter HF SP6660 200mA Charge Pump Inverter or Doubler 11 © Copyright 2000 Sipex Corporation THEORY OF OPERATION Negative Voltage Inverter This is the most common application of the SP6660 where a +1.5V to +4.25V input is converted to a -1.5V to -4.25V output. In the inverting mode, the SP6660 is typically operated with LV connected to GND. Since the LV may be left open, the substitution of the SP6660 for the ICL7660 industry standard is simplified. The SP6660 is insensitive to load current changes. Output Source Resistance vs. Supply Voltage and Temperature curves are shown in Figures 14 to 16. A typical output source resistance of 5.2Ω allows an output voltage of -4.25V under light load with an input of +4.25V. This output voltage decreases to only -4.0V with a load current draw of 100mA. The circuit for the voltage inverter mode can be found in Figure 21. This operating circuit uses only two external capacitors, C1 and C2, for the internal charge pump. This allows designers to avoid any EMI concerns with the costly, space-consuming inductors typically used with switching regulators. The peak-to-peak output ripple voltage is calculated as follows: IOUT + IOUT(ESRC2) 2(fPUMP)(C2) VRIPPLE = TYPICAL CIRCUIT: VOLTAGE INVERTER +V 1 FC CAP+ GND 2 SP6660 8 +VIN +1.5V to +4.25V 7 OSC LV 3 6 4 5 C1 1µF to 150µF CAP- OUT NEGATIVE VOLTAGE OUTPUT C2 1µF to 150µF Figure 21. Typical Operating Circuit for the Voltage Inverter SP6660DS/11 SP6660 200mA Charge Pump Inverter or Doubler 12 © Copyright 2000 Sipex Corporation Positive Voltage Doubler The SP6660 can double the output voltage of an input power supply or battery. From a +4.25V input, the circuit in Figure 22 can provide 100mA with +8.0V at V+. The no-load voltage output at V+ is 2(VINL). For a nominal fPUMP of 5kHz (where fOSC =10kHz) and C2=150µF with an ESR of 0.2Ω, the ripple is approximately 90mV with a 100mA load current. If C2 is raised to 390µF, the ripple drops to 45mV. The output ripple voltage is calculated by noting that capacitor C2 supplies the output current during one-half of the charge pump cycle. LV may be tied to OUT pin for all input voltages in the positive voltage doubler mode. Connect the power-supply positive voltage input to GND pin. Connect the power-supply ground input to OUT pin. V+ is the positive voltage output in this mode. OSC is internally connected to a 15pF capacitor. An external capacitor can be added to slow the oscillator. Designers should take care to minimize stray capacitance. An external oscillator may also be connected to overdrive OSC. Refer to the Oscillator Control section for further details. Designers may overdrive OSC in the positive voltage doubler mode. Refer to the Oscillator Control section for further details. +VIN +1.5V to +4.25V TYPICAL CIRCUIT: VOLTAGE DOUBLER +V 1 FC CAP+ GND 2 SP6660 7 3 6 C1 1µF to 150µF CAP- DOUBLE VOLTAGE OUTPUT 8 5 4 OSC C2 1µF to 150µF LV OUT Figure 22. Typical Operating Circuit for the Positive Voltage Doubler SP6660DS/11 SP6660 200mA Charge Pump Inverter or Doubler 13 © Copyright 2000 Sipex Corporation FC OSC Oscillator Frequency open open 10kHz typical V+ open 80kHz typical open or V+ external capacitor refer to Figure 11 open external clock external clock frequency Optimizing Loss Conditions Losses in SP6660 applications can be anticipated from the following: 1. Output Resistance: VLOSSΩ = ILOAD x ROUT where VLOSSΩ is the voltage drop due to the SP6660 output resistance, ILOAD is the load current, and ROUT is the SP6660 output resistance. Figure 23. Four control modes for the SP6660 Oscillator Frequency 2. Charge Pump Capacitor ESR: VLOSSC1 ≈ 4 x ESRC1 x ILOAD Oscillator Control Refer to Figure 23 for a table of the four control modes of the SP6660 internal oscillator frequencies. In the first mode, FC and OSC are open (unconnected) and the internal oscillator typically runs at 10kHz. OSC is internally connected to a 15pF capacitor. where VLOSSC1 is the voltage drop due to the charge pump capacitor, C1, ESRC1 is the ESR of C1, and ILOAD is the load current. The loss in C1 is larger than the loss in the reservoir capacitor, C2, because it handles a current almost four times larger than the load current during chargepump operation. As a result of this, a change in the capacitor ESR has a much greater impact on the performance of the SP6660 for C1 than for C2. In the second mode, FC is connected to V+. The charge and discharge current at OSC changes from 1.0µA to 8.0µA, increasing the oscillator frequency eight times to 80kHz. 3. Reservoir Capacitor ESR: In the third mode, the oscillator frequency is lowered by connecting a capacitor between OSC and GND. FC can still multiply the frequency by eight times in this mode, but for a lower range of frequencies. Refer to Figure 11 for these ranges. VLOSSC2 = ESRC2 x ILOAD where VLOSSC2 is the voltage drop due to the reservoir capacitor C2, ESRC2 is the ESR of C2, and ILOAD is the load current. Increasing the capacitance of C2 and/or reducing its ESR can reduce the output ripple that may be caused by the charge pump. A designer can filter high-frequency noise at the output by implementing a low ESR capacitor at C2. Generally, capacitors with larger capacitance values and higher voltage ratings tend to reduce ESR. In the fourth mode, any standard CMOS logic output can be used to drive OSC. OSC may be overdriven by an external oscillator that swings between VIN and GND. When OSC is overdriven, FC has no effect. Unlike the 7660 and 660 industry standards, designers may overdrive the oscillator of the SP6660 in both the inverting and the Voltage Doubling Mode. SP6660DS/11 SP6660 200mA Charge Pump Inverter or Doubler 14 © Copyright 2000 Sipex Corporation Optimizing Capacitor Selection Refer to Figure 24 for the total output resistance for various capacitance values and oscillator frequencies. The reservoir and charge pump capacitor values are equal. The capacitance values required to maintain comparable ripple and output resistance typically diminish proportionately as the pump frequency of the SP6660 increases. Designing a Multiple of the SP6660 Negative Inverted Output Voltage The SP6660 can be cascaded to allow a designer to provide a multiple of the negative inverted output voltage of a single SP6660 device. The approximate total output resistance, RTOT,of the cascaded SP6660 devices is equal to the sum of the individual SP6660 output resistance values, ROUT. The output voltage, VTOT, is a multiple of the number of cascaded SP6660 devices and the output voltage of an individual SP6660 device, VOUT. Refer to Figure 25 for the circuit cascading SP6660 devices. Note that the capacitance value of C1 for the charge pump and C2 at V OUT is multiplied respectively to the number of cascaded SP6660 devices. The test conditions for the curves of Figure 24 are the same as for Figures 2 to 20 for the circuits in Figures 1 and 2; additional conditions are as follows: C1 = C2 = 0.2Ω ESR capacitors ROUT = 4.2Ω Connecting the SP6660 in Parallel SP6660 devices can be connected in parallel to reduce the total output resistance. The approximate total output resistance, RTOT, of the multiple devices connected in parallel is equal to the output resistance of an individual SP6660 device divided by the total number of devices connected. Refer to Figure 26 for the circuit connecting multiple SP6660 devices in parallel. Note that only the charge pump capacitor value of C1 is multiplied respectively by the number of SP6660 connected in parallel. A single capacitor C2 at the output voltage VOUT of the "nth" device connected in parallel serves all devices connected. The flat portion of the curves shown at a 5.2Ω effective output resistance is a result of the SP6660's 5.25Ω output resistance where 5.2Ω = ROUT(SP6660) + (4 x ESRC1) + ESRC2. Instead of the typical 5.2Ω, ROUT = 4.2Ω is used because the typical specification includes the effect of the ESRs of the capacitors used in the test circuit in Figures 1 and 2. Refer to Figures 17, 18, 19 and 20 for the output currents using 0.33µF to 220µF capacitors. Output currents are plotted for 3.0V and 4.5V inputs taking into consideration a 10% to 20% loss in the input voltage. The SP6660 5.2Ω series resistance limits increases in output current vs. capacitance for values much higher than 47µF. Larger values may still be useful to reduce ripple. SP6660DS/11 SP6660 200mA Charge Pump Inverter or Doubler 15 © Copyright 2000 Sipex Corporation +VIN +VIN +VIN 1 FC CAP+ GND C1 CAP- FC 8 2 SP6660 7 “1” 6 3 OSC LV C1 x 2 OUT 5 4 CAP+ GND CAP- 1 2 3 8 FC SP6660 7 CAP+ “2” 6 OSC LV 5 4 GND C1 x n OUT CAP- 1 2 8 SP6660 3 6 5 4 C2 _ 2 C2 7 “n” OSC LV OUT VOUT C2 _ n VOUT = -n x VIN where VOUT = output voltage, VIN = input voltage, and n = the total number of SP6660 devices connected. Figure 25. SP6660 Devices Cascaded to Provide a Multiple of a Negative Inverted Output Voltage +VIN 1 FC CAP+ GND C1 CAP- 2 FC 8 SP6660 7 “1” 6 3 4 RTOT = OSC LV 5 CAP+ OUT C1 _ 2 GND CAP- +VIN 1 2 3 8 FC SP6660 7 CAP+ “2” 6 OSC LV 5 4 C1 _ n OUT GND CAP- +VIN 1 2 8 SP6660 RTOT 7 OSC LV 3 “n” 6 5 4 ROUT n where RTOT = total resistance of the SP6660 devices connected in parallel, ROUT = the output resistance of a single SP6660 device, and n = the total number of SP6660 devices connected in parallel. OUT C2 Figure 26. SP6660 Devices Connected in Parallel to Reduce Output Resistance SP6660DS/11 SP6660 200mA Charge Pump Inverter or Doubler 16 © Copyright 2000 Sipex Corporation C3 +VIN D1 1 FC CAP+ GND C1 CAP- 2 D2 V+ VOUT1 8 SP6660 7 OSC C4 LV 3 6 4 5 OUT VOUT2 C2 VOUT1 = (2 x VIN) - VFD1 - VFD2 VOUT2 = -VIN where VOUT1 = positive doubled output voltage, VIN = input voltage, VFD1 = forward bias voltage across D1, VFD2 = forward bias voltage across D2, and VOUT2 = inverted output voltage. Figure 27. The SP6660 Connected for Negative Voltage Conversion with Positive Supply Multiplication Circuit for Negative Voltage Conversion with Positive Supply Multiplication A designer can use the circuit in Figure 27 to provide both an inverted output voltage at VOUT1 and a positive multiple of V IN at V OUT2 (subtracting the forward biased voltages of D1 and D2). Capacitor C1 is for the charge pump and capacitor C2 is for the reservoir function to SP6660DS/11 generate the inverted output voltage at VOUT2. Capacitor C3 is for the charge pump and capacitor C4 is for the reservoir function to generate the multiplied positive output voltage at VOUT1. Designers should pay special attention to the possibility of higher source impedances at the generated supplies due to the finite impedance of the common charge pump driver. SP6660 200mA Charge Pump Inverter or Doubler 17 © Copyright 2000 Sipex Corporation DOUBLER VIN GND CAP+ C3 150µF Tant. + C1 150µF Tant. 1 FC SP6660 V+ 8 2 CAP+ OSC 7 3 GND LV 6 4 CAPOUT 5 +5 VOUT D1 + C2 150µF + Tant. C4 4.7µF Cer. 1 V LP2985 V 5 2 GND 3 ON/OFF_N BYPASS 4 OUT IN GND GND C5 10nF Cer. FC Figure 28. The SP6660 and a LDO Regulator Connected as a 3V Input to Regulated 5V Output Converter. APPLICATIONS The SP6660 Evaluation Board provides a 3V to 5V 160mA DC to DC Converter using the SP6660 Doubler Circuit and a 5V LDO Regulator. g 100 Power Efficiency y ((%) ) SP6660 Ripple VIN = 3.2V VOUT6660 = 5.53V VOUT LDO = 4.95V ILOAD = 150mA 5VLDO Ripple 90 IL = 150mA 80 70 60 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 Input Voltage (V) Figure 30. Power Efficiency vs Input Voltage - SP6660 Doubler with 5V LDO Figure 29. Ripple and Noise output of the SP6660 and a LDO Regulator with ILOAD = 150mA 200 Vin = 3.0V Vin = 3.3V Vin = 3.6V 90 Ripple Voltage (mV) Power Efficiency (%) 100 80 70 150 6660 Ripple IL = 150mA LDO Ripple IL = 150mA 100 50 60 1 10 100 0 1000 2.8 Load Current (mA) 3.2 3.4 3.6 3.8 4.0 4.2 Input Voltage (V) Figure 32. Ripple Voltage vs Input Voltage SP6660 Doubler with 5V LDO Figure 31. Power Efficiency vs Load Current - SP6660 Doubler with 5V LDO SP6660DS/11 3.0 SP6660 200mA Charge Pump Inverter or Doubler 18 © Copyright 2000 Sipex Corporation PACKAGE: PLASTIC DUAL–IN–LINE (NARROW) E1 E D1 = 0.005" min. (0.127 min.) A1 = 0.015" min. (0.381min.) D A = 0.210" max. (5.334 max). C A2 L B1 B e = 0.100 BSC (2.540 BSC) Ø eA = 0.300 BSC (7.620 BSC) ALTERNATE END PINS (BOTH ENDS) DIMENSIONS (Inches) Minimum/Maximum (mm) 8–PIN 14–PIN 16–PIN 18–PIN 20–PIN 22–PIN A2 0.115/0.195 (2.921/4.953) 0.115/0.195 (2.921/4.953) 0.115/0.195 (2.921/4.953) 0.115/0.195 (2.921/4.953) 0.115/0.195 (2.921/4.953) 0.115/0.195 (2.921/4.953) B 0.014/0.022 (0.356/0.559) 0.014/0.022 (0.356/0.559) 0.014/0.022 (0.356/0.559) 0.014/0.022 (0.356/0.559) 0.014/0.022 (0.356/0.559) 0.014/0.022 (0.356/0.559) B1 0.045/0.070 (1.143/1.778) 0.045/0.070 (1.143/1.778) 0.045/0.070 (1.143/1.778) 0.045/0.070 (1.143/1.778) 0.045/0.070 (1.143/1.778) 0.045/0.070 (1.143/1.778) C 0.008/0.014 (0.203/0.356) 0.008/0.014 (0.203/0.356) 0.008/0.014 (0.203/0.356) 0.008/0.014 (0.203/0.356) 0.008/0.014 (0.203/0.356) 0.008/0.014 (0.203/0.356) D 0.355/0.400 0.735/0.775 0.780/0.800 0.880/0.920 0.980/1.060 1.145/1.155 (9.017/10.160) (18.669/19.685) (19.812/20.320) (22.352/23.368) (24.892/26.924) (29.083/29.337) E 0.300/0.325 (7.620/8.255) 0.300/0.325 (7.620/8.255) 0.300/0.325 (7.620/8.255) 0.300/0.325 (7.620/8.255) 0.300/0.325 (7.620/8.255) 0.300/0.325 (7.620/8.255) E1 0.240/0.280 (6.096/7.112) 0.240/0.280 (6.096/7.112) 0.240/0.280 (6.096/7.112) 0.240/0.280 (6.096/7.112) 0.240/0.280 (6.096/7.112) 0.240/0.280 (6.096/7.112) L 0.115/0.150 (2.921/3.810) 0.115/0.150 (2.921/3.810) 0.115/0.150 (2.921/3.810) 0.115/0.150 (2.921/3.810) 0.115/0.150 (2.921/3.810) 0.115/0.150 (2.921/3.810) Ø 0°/ 15° (0°/15°) 0°/ 15° (0°/15°) 0°/ 15° (0°/15°) 0°/ 15° (0°/15°) 0°/ 15° (0°/15°) 0°/ 15° (0°/15°) SP6660DS/11 SP6660 200mA Charge Pump Inverter or Doubler 19 © Copyright 2000 Sipex Corporation PACKAGE: PLASTIC SMALL OUTLINE (SOIC) (NARROW) E H h x 45° D A Ø e B A1 L DIMENSIONS (Inches) Minimum/Maximum (mm) SP6660DS/11 8–PIN 14–PIN 16–PIN A 0.053/0.069 (1.346/1.748) 0.053/0.069 (1.346/1.748) 0.053/0.069 (1.346/1.748) A1 0.004/0.010 (0.102/0.249 0.004/0.010 (0.102/0.249) 0.004/0.010 (0.102/0.249) B 0.014/0.019 (0.35/0.49) 0.013/0.020 (0.330/0.508) 0.013/0.020 (0.330/0.508) D 0.189/0.197 (4.80/5.00) 0.337/0.344 0.386/0.394 (8.552/8.748) (9.802/10.000) E 0.150/0.157 (3.802/3.988) 0.150/0.157 (3.802/3.988) 0.150/0.157 (3.802/3.988) e 0.050 BSC (1.270 BSC) 0.050 BSC (1.270 BSC) 0.050 BSC (1.270 BSC) H 0.228/0.244 (5.801/6.198) 0.228/0.244 (5.801/6.198) 0.228/0.244 (5.801/6.198) h 0.010/0.020 (0.254/0.498) 0.010/0.020 (0.254/0.498) 0.010/0.020 (0.254/0.498) L 0.016/0.050 (0.406/1.270) 0.016/0.050 (0.406/1.270) 0.016/0.050 (0.406/1.270) Ø 0°/8° (0°/8°) 0°/8° (0°/8°) 0°/8° (0°/8°) SP6660 200mA Charge Pump Inverter or Doubler 20 © Copyright 2000 Sipex Corporation PACKAGE: 0.0256 BSC PLASTIC MICRO SMALL OUTLINE (µSOIC) 12.0˚ ±4˚ 0.012 ±0.003 0.0965 ±0.003 0.008 0˚ - 6˚ 0.006 ±0.006 0.006 ±0.006 R .003 0.118 ±0.004 0.16 ±0.003 12.0˚ ±4˚ 0.01 0.020 0.020 1 0.0215 ±0.006 0.037 Ref 3.0˚ ±3˚ 2 0.116 ±0.004 0.034 ±0.004 0.116 ±0.004 0.040 ±0.003 0.013 ±0.005 0.118 ±0.004 0.118 ±0.004 0.004 ±0.002 All package dimensions in inches 50 µSOIC devices per tube SP6660DS/11 SP6660 200mA Charge Pump Inverter or Doubler 21 © Copyright 2000 Sipex Corporation ORDERING INFORMATION Model Temperature Range Package Type SP6660CP . ............................................. 0˚C to +70˚C .............................................. 8-Pin PDIP SP6660EP . ............................................ -40˚C to +85˚C ............................................ 8-Pin PDIP SP6660CN . ............................................. 0˚C to +70˚C ........................................... 8-Pin NSOIC SP6660EN . ............................................ -40˚C to +85˚C ......................................... 8-Pin NSOIC SP6660CU . ............................................. 0˚C to +70˚C ........................................... 8-Pin µSOIC SP6660EU . ............................................ -40˚C to +85˚C ......................................... 8-Pin µSOIC SP6660EB .......................................................................................................... Evaluation Board Please consult the factory for pricing and availability on a Tape-On-Reel option. Corporation SIGNAL PROCESSING EXCELLENCE Sipex Corporation Headquarters and Sales Office 22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: [email protected] Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. SP6660DS/11 SP6660 200mA Charge Pump Inverter or Doubler 22 © Copyright 2000 Sipex Corporation