NCP7662 Inductorless Voltage Converter The NCP7662 is a pin–compatible upgrade to the industry standard TC7660 charge pump voltage converter. It converts a +1.5 V to +15 V input to a corresponding –1.5 to –15 V output using only two low–cost capacitors, eliminating inductors and their associated cost, size and EMI. The on–board oscillator operates at a nominal frequency of 10 kHz. Frequency is increased to 35 kHz when pin 1 is connected to V+, allowing the use of smaller external capacitors. Operation below 10 kHz (for lower supply current applications) is also possible by connecting an external capacitor from OSC to ground (with pin 1 open). The NCP7662 is available in both 8–pin DIP and 8–pin small outline (SO) packages in commercial and extended temperature ranges. http://onsemi.com MARKING DIAGRAMS 8 8 1 1 Features • Wide Operating Voltage Range: 1.5 V to 15 V Boost Pin (Pin 1) for Higher Switching Frequency High Power Efficiency is 96% Easy to Use – Requires Only 2 External Non–Critical Passive Components Improved Direct Replacement for Industry Standard ICL7660 and Other Second Source Devices Applications • • • • • " " Simple Conversion of +5 V to 5 V Supplies Voltage Multiplication VOUT = nVIN Negative Supplies for Data Acquisition Systems and Instrumentation RS232 Power Supplies Supply Splitter, VOUT = VS/2 " 8 NCP7662 YYWWXZ CO PDIP–8 P SUFFIX CASE 626 8 1 1 YY, Y WW X Z CO = Year = Work Week = Assembly ID Code = Subcontractor ID Code = Country of Orgin PIN CONNECTIONS BOOST 1 CAP+ 2 GND 3 CAP– 4 8 V+ NCP7662 • • • • NCP 7662 YWWXZ SO–8 D SUFFIX CASE 751 7 OSC 6 LOW VOLTAGE (LV) 5 VOUT ORDERING INFORMATION Device NCP7662DR2 NCP7662P Semiconductor Components Industries, LLC, 2000 June, 2000 – Rev. 0 1 Package Shipping SO–8 2500 Tape & Reel PDIP–8 50 Units/Rail Publication Order Number: NCP7662/D NCP7662 Functional Block Diagram V+ CAP + 8 BOOST 1 7 RC OSCILLATOR OSC LV 2 B2 4 VOLTAGE LEVEL TRANSLATOR 6 CAP – 5 V OUT INTERNAL VOLTAGE REGULATOR LOGIC NETWORK NCP7662 3 GND ABSOLUTE MAXIMUM RATINGS Rating Symbol Supply Voltage LV, Boost and OSC Inputs Voltage (Note 1.) V+ 5.5 V 5.5 V u Value Unit +16.5 V V t –0.3 V to (V+ + 0.3 V) (V+ –5.5 V) to (V+ + 0.3 V) Current into LV (Note 1.) V+ 3.5 V u Output Short Duration (VSUPPLY 5.5 V) v Power Dissipation (Note 2.) Plastic DIP SO 20 µA Continuous V mW 730 470 Operating Temperature Range –40 to +85 °C Storage Temperature Range –65 to +150 °C +300 °C Lead Temperature (Soldering, 10 sec) Static–sensitive device. Unused devices must be stored in conductive material. Protect devices from static discharge and static fields. Stresses above those listed under “Absolute Maximum Ratings’’ may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 1. Connecting any terminal to voltages greater than V+ or less than GND may cause destructive latch–up. It is recommended that no inputs from sources operating from external supplies be applied prior to “power up’’ of the NCP7662. 2. Derate linearly above 50°C by 5.5 mW/°C. http://onsemi.com 2 NCP7662 ELECTRICAL CHARACTERISTICS (V+ = 5 V, TA = +25°C, OSC = Free running, Test Circuit Figure 2, unless otherwise specified.) Characteristics Supply Current (Note 3.) (Boost Pin OPEN or GND) Supply Current (Boost Pin = V+) Supply Voltage Range, High (Note 4.) Supply Voltage Range, Low Output Source Resistance Test Conditions Symbol Min Typ Max Unit RL = ∞, +25°C 0°C TA +70°C –40°C TA +85°C I+ – 80 160 µA – – 180 – – 180 – – 300 – – 350 v v v v 0°C v TA v +70°C –40°C v TA v +85°C I+ RL = 10 kΩ, LV Open, TMIN TA V+H 3.0 – 15 V RL = 10 kΩ, LV to GND, TMIN TA V+L 1.5 – 3.5 V ROUT – 65 100 Ω v v TMAX v v TMAX IOUT = 20 mA, 0°C v TA v +70°C IOUT = 20 mA, –40°C v TA v +85°C – – 120 IOUT = 3 mA, V+ = 2 V, LV to GND, 0°C TA +70°C – – 250 IOUT = 3 mA, V+ = 2 V, LV to GND, –40°C TA +85°C – – 300 v v v v Oscillator Frequency µA COSC = 0, Pin 1 Open or GND Pin 1 = V+ fOSC 5.0 – 10 35 – – kHz RL = 5 kΩ, TMIN TA TMAX v v PEff 96 96 – % 95 97 – Voltage Conversion Efficiency RL = ∞ VOUTEff 99 99.9 – % Oscillator Impedance V+ = 2 V V+ = 5 V ZOSC – – 1.0 100 – – MΩ kΩ Power Efficiency 3. In the test circuit, there is no external capacitor applied to pin 7. However, when the device is plugged into a test socket, there is usually a very small but finite stray capacitance present, of the order of 5 pF. 4. The NCP7662 can operate without an external diode over the full temperature and voltage range. This device will function in existing designs which incorporate an external diode with no degradation in overall circuit performance. http://onsemi.com 3 NCP7662 DETAILED DESCRIPTION THEORETICAL POWER EFFICIENCY CONSIDERATIONS The NCP7662 contains all the necessary circuitry to complete a negative voltage converter, with the exception of two external capacitors which may be inexpensive 1 µF polarized electrolytic types. The mode of operation of the device may be best understood by considering Figure 2, which shows an idealized negative voltage converter. Capacitor C1 is charged to a voltage V+ for the half cycle when switches S1 and S3 are closed. (Note: Switches S2 and S4 are open during this half cycle.) During the second half cycle of operation, switches S2 and S4 are closed, with S1 and S3 open, thereby shifting capacitor C1 negatively by V+ volts. Charge is then transferred from C1 to C2 such that the voltage on C2 is exactly V+, assuming ideal switches and no load on C2. The NCP7662 approaches this ideal situation more closely than existing non–mechanical circuits. In the NCP7662 the four switches of Figure 2 are MOS power switches; S1 is a P–channel device and S2, S3 and S4 are N–channel devices. The main difficulty with this approach is that in integrating the switches, the substrates of S3 and S4 must always remain reverse biased with respect to their sources, but not so much as to degrade their “ON’’ resistances. In addition, at circuit start up, and under output short circuit conditions (VOUT = V+), the output voltage must be sensed and the substrate bias adjusted accordingly. Failure to accomplish this would result in high power losses and probable device latchup. The problem is eliminated in the NCP7662 by a logic network which senses the output voltage (VOUT) together with the level translators, and switches the substrates of S3 and S4 to the correct level to maintain necessary reverse bias. The voltage regulator portion of the NCP7662 is an integral part of the anti–latchup circuitry; however, its inherent voltage drop can degrade operation at low voltages. Therefore, to improve low voltage operation, the “LV’’ pin should be connected to GND, disabling the regulator. For supply voltages greater than 3.5 volts, the LV terminal must be left open to insure latchup proof operation and prevent device damage. 1 2 C1 10 µF + 3 4 NCP7662 V+ 8 7 In theory, a voltage converter can approach 100% efficiency if certain conditions are met: A. The drive circuitry consumes minimal power. B. The output switches have extremely low ON resistance and virtually no offset. C. The impedances of the pump and reservoir capacitors are negligible at the pump frequency. The NCP7662 approaches these conditions for negative voltage conversion if large values of C1 and C2 are used. Energy is lost only in the transfer of charge between capacitors if a change in voltage occurs. The energy lost is defined by: E = 1/2 C1 (V12 – V22) where V1 and V2 are the voltages on C1 during the pump and transfer cycles. If the impedances of C1 and C2 are relatively high at the pump frequency (refer to Figure 2) compared to the value of RL, there will be a substantial difference in voltages V1 and V2. Therefore, it is desirable not only to make C2 as large as possible to eliminate output voltage ripple, but also to employ a correspondingly large value for C1 in order to achieve maximum efficiency of operation. Dos and Don’ts 1. Do not exceed maximum supply voltages. 2. Do not connect the LV terminal to GND for supply voltages greater than 3.5 volts. 3. Do not short circuit the output to V+ supply for voltages above 5.5 volts for extended periods; however, transient conditions including start–up are okay. 4. When using polarized capacitors in the inverting mode, the + terminal of C1 must be connected to pin 2 of the NCP7662 and the – terminal of C2 must be connected to GND. 5. If the voltage supply driving the NCP7662 has a large source impedance (25–30 ohms), then a 2.2 µF capacitor from pin 8 to ground may be required to limit the rate of rise of the input voltage to less than 2 V/µs. V IN IS S1 V+ I L (+5 V) S2 C1 6 5 RL S3 VO S4 C2 V OUT = – VIN C2 + 10 µF Figure 2. Idealized Negative Voltage Capacitor Figure 1. Test Circuit http://onsemi.com 4 NCP7662 TYPICAL APPLICATIONS R O Simple Negative Voltage Converter The majority of applications will undoubtedly utilize the NCP7662 for generation of negative supply voltages. Figure 3 shows typical connections to provide a negative supply where a positive supply of +1.5 V to +15 V is available. Keep in mind that pin 6 (LV) is tied to the supply negative (GND) for supply voltages below 3.5 volts. Since the ESRs of the capacitors are reflected in the output impedance multiplied by a factor of 5, a high value could potentially swamp out a low 1/(fPUMP C1) term, rendering an increase in switching frequency or filter capacitance ineffective. Typical electrolytic capacitors may have ESRs as high as 10 Ω. V+ + – 1 8 NCP7662 10 µF 2 3 7 5 4 10 µF Output Ripple RO 6 VOUT = –V+ – + (a) ESR also affects the ripple voltage seen at the output. The total ripple is determined by 2 voltages, A and B, as shown in Figure 4. Segment A is the voltage drop across the ESR of C2 at the instant it goes from being charged by C1 (current flowing into C2) to being discharged through the load (current flowing out of C2). The magnitude of this current change is 2 IOUT, hence the total drop is 2 IOUT ESRC2 volts. Segment B is the voltage change across C2 during time t2, the half of the cycle when C2 supplies current to the load. The drop at B is IOUT t2/C2 volts. The peak–to–peak ripple voltage is the sum of these voltage drops: VOUT – V+ + (b) Figure 3. Simple Negative Converter and its Output Equivalent The output characteristics of the circuit in Figure 3 can be approximated by an ideal voltage source in series with a resistance as shown in Figure 3b. The voltage source has a value of –(V+). The output impedance (RO) is a function of the ON resistance of the internal MOS switches (shown in Figure 2), the switching frequency, the value of C1 and C2, and the ESR (equivalent series resistance) of C1 and C2. A good first order approximation for RO is: R O V RIPPLE ^ ǒ 1 2 f ^ 2(RSW1 ) RSW3 ) ESRC1) ) 2(RSW2 ) RSW4 ) ESRC1) ) f 1 C ) ESRC2 PUMP (f ^ 2 23 ) 5 103 110 10–6) ) 4 ESRC1 ) ESRC2 R ^ (46 ) 20 ) 5 ESR ) Ω O C + PUMP f OSC , R SWX 2 t2 ^2 R ) SW f 0 + MOSFET switch resistance) 1 PUMP ) ESRC2Ω C2 ) ESRC2 I Ǔ OUT t1 1 B V Combining the four RSWX terms as RSW, we see that: R O PUMP C1 )4 ESR A –(V+) C1 Figure 4. Output Ripple RSW, the total switch resistance, is a function of supply voltage and temperature (see the Output Source Resistance graphs), typically 23 Ω at +25°C and 5 V. Careful selection of C1 and C2 will reduce the remaining terms, minimizing the output impedance. High value capacitors will reduce the 1/(fPUMP C1) component, and low ESR capacitors will lower the ESR term. Increasing the oscillator frequency will reduce the 1/(fPUMP C1) term, but may have the side effect of a net increase in output impedance when C1 10 µF and there is not enough time to fully charge the capacitors every cycle. In a typical application when fOSC = 10 kHz and C = C1 = C2 = 10 µF: Paralleling Devices Any number of NCP7662 voltage converters may be paralleled to reduce output resistance (Figure 5). The reservoir capacitor, C2, serves all devices, while each device requires its own pump capacitor, C1. The resultant output resistance would be approximately: OUT + n (number of devices) R u R http://onsemi.com 5 OUT (of NCP7662) NCP7662 V+ + – 3 7 1 6 2 5 4 C1 + – NCP7662 2 C1 shown in Figure 7. In order to prevent device latchup, a 1 kΩ resistor must be used in series with the clock output. In a situation where the designer has generated the external clock frequency using TTL logic, the addition of a 10 kΩ pullup resistor to V+ supply is required. Note that the pump frequency with external clocking, as with internal clocking, will be 1/2 of the clock frequency. Output transitions occur on the positive–going edge of the clock. 8 NCP7662 1 3 4 8 RL 7 6 5 C2 + V+ Figure 5. Paralleling Devices 2 10 µF + 3 Cascading Devices + * n(VIN) 4 “1” 5 7 6 1 10 µF + 2 3 4 *VOUT = –nV+ NCP7662 3 NCP7662 2 8 8 It is also possible to increase the conversion efficiency of the NCP7662 at low load levels by lowering the oscillator frequency. This reduces the switching losses, and is shown in Figure 8. However, lowering the oscillator frequency will cause an undesirable increase in the impedance of the pump (C1) and reservoir (C2) capacitors; this is overcome by increasing the values of C1 and C2 by the same factor that the frequency has been reduced. For example, the addition of a 100 pF capacitor between pin 7 (Osc) and V+ will lower the oscillator frequency to 1 kHz from its nominal frequency of 10 kHz (multiple of 10), and thereby necessitate a corresponding increase in the value of C1 and C2 (from 10 µF to 100 µF). “n” 5 7 6 V OUT * + VOUT 10 µF Figure 7. External Clocking V+ 10 µF + 6 + where n is an integer representing the number of devices cascaded. The resulting output resistance would be approximately the weighted sum of the individual NCP7662 ROUT values. 1 CMOS GATE 5 10 µF V+ 10 µF 1 2 + Figure 6. Cascading Devices for Increased Output Voltage C1 3 4 NCP7662 OUT V+ 1 kΩ 7 4 The NCP7662 may be cascaded as shown to produce larger negative multiplication of the initial supply voltage. However, due to the finite efficiency of each device, the practical limit is 10 devices for light loads. The output voltage is defined by: V 8 NCP7662 1 8 C OSC 7 6 5 + C2 VOUT Changing the NCP7662 Oscillator Frequency It may be desirable in some applications (due to noise or other considerations) to increase the oscillator frequency. This is achieved by one of several methods described below: By connecting the Boost Pin (Pin 1) to V+, the oscillator charge and discharge current is increased and, hence the oscillator frequency is increased by approximately 3–1/2 times. The result is a decrease in the output impedance and ripple. This is of major importance for surface mount applications where capacitor size and cost are critical. Smaller capacitors, e.g., 0.1 µF, can be used in conjunction with the Boost Pin in order to achieve similar output currents compared to the device free running with C1 = C2 = 1 µF or 10 µF. (Refer to graph of Output Source Resistance as a Function of Oscillator Frequency). Increasing the oscillator frequency can also be achieved by overdriving the oscillator from an external clock as Figure 8. Lowering Oscillator Frequency Positive Voltage Doubling The NCP7662 may be employed to achieve positive voltage doubling using the circuit shown in Figure 9. In this application, the pump inverter switches of the NCP7662 are used to charge C1 to a voltage level of V+ – VF (where V+ is the supply voltage and VF is the forward voltage on C1 plus the supply voltage (V+) applied through diode D2 to capacitor C2). The voltage thus created on C2 becomes (2 V+) – (2 VF), or twice the supply voltage minus the combined forward voltage drops of diodes D1 and D2. The source impedance of the output (VOUT) will depend on the output current, but for V+ = 5 V and an output current of 10 mA, it will be approximately 60 Ω. http://onsemi.com 6 NCP7662 V+ 3 D1 7 D2 X 6 4 + 5 C1 + C2 V+ 50 µF R L1 Figure 9. Positive Voltage Multiplier VOUT = (V+) – (V–) 2 Combined Negative Voltage Conversion and Positive Supply Multiplication NCP7662 1 2 3 + C1 4 + D2 VOUT = (2 V+) – (2 VF) 5 + 50 µF + 6 5 + – In some cases, the output impedance of the NCP7662 can be a problem, particularly if the load current varies substantially. The circuit of Figure 12 can be used to overcome this by controlling the input voltage, via the MC33201 op amp, in such a way as to maintain a nearly constant output voltage. Direct feedback is advisable, since the NCP7662’s output does not respond instantaneously to change in input, but only after the switching delay. The circuit shown supplies enough delay to accommodate the NCP7662, while maintaining adequate feedback. An increase in pump and storage capacitors is desirable, and the values shown provide an output impedance of less than 5 Ω to a load of 10 mA. 50 k +8 V C2 7 Regulated Negative Voltage Supply C3 D1 3 Figure 11. Splitting a Supply in Half 8 6 2 + – 8 V– VOUT = –(V+) – (VF) 7 1 4 R L2 Figure 10 combines the functions shown in Figures 3 and 9 to provide negative voltage conversion and positive voltage doubling simultaneously. This approach would be, for example, suitable for generating +9 V and –5 V from an existing +5 V supply. In this instance, capacitors C1 and C3 perform the pump and reservoir functions, respectively, for the generation of the negative voltage, while capacitors C2 and C4 are pump and reservoir, respectively, for the doubled positive voltage. There is a penalty in this configuration which combines both functions, however, in that the source impedances of the generated supplies will be somewhat higher due to the finite impedance of the common charge pump driver at pin 2 of the device. V+ 50 µF + – NCP7662 2 can be drawn from the device. By using this circuit, and then the circuit of Figure 6, +15 V can be converted (via +7.5 V and –7.5 V) to a nominal –15 V, though with rather high series resistance ( 250 Ω). VOUT = (2 V+) – (2 VF) C4 56 k 50 k +8 V – + Figure 10. Combined Negative Converter and Positive Doubler 100 k The bidirectional characteristics can also be used to split a higher supply in half, as shown in Figure 11. The combined load will be evenly shared between the two sides and a high value resistor to the LV pin ensures start–up. Because the switches share the load in parallel, the output impedance is much lower than in the standard circuits, and higher currents 10 µF V+ MC33201 1 100 µF Voltage Splitting 100 Ω + – 2 3 NCP7662 NCP7662 8 + – 1 4 800 k 8 7 6 5 250 K VOLTAGE ADJUST VOUT 100 µF Figure 12. Regulating the Output Voltage http://onsemi.com 7 VOLTAGE CONVERSION EFFICIENCY (%) NCP7662 1000 I DD( m A ) 800 600 VIN = 12 V 400 200 VIN = 5 V 0 –40 –20 0 20 40 60 80 100 100.5 Without Load 100.0 99.5 10 K Load 99.0 98.5 98.0 TA = 25°C 1 2 3 4 6 7 8 9 10 INPUT VOLTAGE VIN (V) Figure 13. Supply Current vs. Temperature (with Boost Pin = VIN) Figure 14. Voltage Conversion 11 12 100 OUTPUT SOURCE RESISTANCE (Ω ) 70 50 30 IOUT = 20 mA TA = 25°C 10 1.5 2.5 3.5 4.5 80 60 VIN = 5.5 V 40 20 0 –40 5.5 6.5 7.5 8.5 9.5 10.5 11.5 12 VIN = 2.5 V –20 0 20 40 60 80 100 TEMPERATURE (°C) SUPPLY VOLTAGE (V) Figure 15. Output Source Resistance vs. Supply Voltage Figure 16. Output Source Resistance vs. Temperature 200 SUPPLY CURRENT IDD ( m A ) 0 OUTPUT VOLTAGE VOUT (V) 5 TEMPERATURE (°C) 100 OUTPUT SOURCE RESISTANCE (Ω ) 101.0 –2 –4 –6 –8 –10 10 20 30 40 50 60 70 80 90 150 125 100 100 VIN = 12.5 V 75 50 VIN = 5.5 V 25 0 –40 –12 0 175 –20 0 20 40 60 80 TEMPERATURE (°C) OUTPUT CURRENT (mA) Figure 17. Output Voltage vs. Output Current Figure 18. Supply Current vs. Temperature http://onsemi.com 8 100 NCP7662 60 OSCILLATOR FREQUENCY (kHz) OSCILLATOR FREQUENCY (kHz) 12 10 8 6 VIN = 5 V 4 VIN = 12 V 2 0 –40 –20 0 20 40 60 TEMPERATURE (°C) 80 50 40 VIN = 5 V 30 VIN = 12 V 20 10 0 –40 100 Figure 19. Unloaded Oscillator Frequency vs. Temperature –20 0 20 40 60 TEMPERATURE (°C) 80 Figure 20. Unloaded Oscillator Frequency vs. Temperature with Boost Pin = VIN http://onsemi.com 9 100 NCP7662 PACKAGE DIMENSIONS PDIP–8 P SUFFIX CASE 626–05 ISSUE K 8 NOTES: 1. DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL. 2. PACKAGE CONTOUR OPTIONAL (ROUND OR SQUARE CORNERS). 3. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 5 –B– 1 MILLIMETERS MIN MAX 9.40 10.16 6.10 6.60 3.94 4.45 0.38 0.51 1.02 1.78 2.54 BSC 0.76 1.27 0.20 0.30 2.92 3.43 7.62 BSC ––– 10_ 0.76 1.01 4 DIM A B C D F G H J K L M N F –A– NOTE 2 L C J –T– INCHES MIN MAX 0.370 0.400 0.240 0.260 0.155 0.175 0.015 0.020 0.040 0.070 0.100 BSC 0.030 0.050 0.008 0.012 0.115 0.135 0.300 BSC ––– 10_ 0.030 0.040 N SEATING PLANE D M K G H 0.13 (0.005) M T A M B M SO–8 D SUFFIX CASE 751–06 ISSUE T D A 8 NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 2. DIMENSIONS ARE IN MILLIMETER. 3. DIMENSION D AND E DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE. 5. DIMENSION B DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS OF THE B DIMENSION AT MAXIMUM MATERIAL CONDITION. C 5 0.25 H E M B M 1 4 h B e X 45 _ q A C SEATING PLANE L 0.10 A1 B 0.25 M C B S A S DIM A A1 B C D E e H h L q http://onsemi.com 10 MILLIMETERS MIN MAX 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 4.80 5.00 3.80 4.00 1.27 BSC 5.80 6.20 0.25 0.50 0.40 1.25 0_ 7_ NCP7662 Notes http://onsemi.com 11 NCP7662 ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. 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