XD7660

XD7660 DIP8 / XL7660 SOP8 Super Voltage Converters Features The XD/XL7660 Super Voltage Converters are monolithic CMOS voltage conversion ICs that guarantee significant performance advantages over other similar devices. They are direct replacements for the industry standard XD7660 offering an extended operating supply voltage range up to 12V, with lower supply current. A Frequency Boost pin has been incorporated to enable the user to achieve lower output impedance despite using smaller capacitors. All improvements are highlighted in the “Electrical Specifications” section on page 3. Critical parameters are guaranteed over the entire commercial and industrial temperature ranges. • Guaranteed Lower Max Supply Current for All Temperature Ranges • Wide Operating Voltage Range: 1.5V to 12V • 100% Tested at 3V • Boost Pin (Pin 1) for Higher Switching Frequency • Guaranteed Minimum Power Efficiency of 96% • Improved Minimum Open Circuit Voltage Conversion Efficiency of 99% • Improved SCR Latchup Protection • Simple Conversion of +5V Logic Supply to ±5V Supplies The XD/XL7660 perform supply voltage conversions from positive to negative for an input range of 1.5V to 12V, resulting in complementary output voltages of -1.5V to -12V. Only two non-critical external capacitors are needed, for the charge pump and charge reservoir functions. The XD/XL7660 can be connected to function as a voltage doubler and will generate up to 22.8V with a 12V input. They can also be used as a voltage multipliers or voltage dividers. • Simple Voltage Multiplication VOUT = (-)nVIN • Easy to Use; Requires Only Two External Non-Critical Passive Components • Improved Direct Replacement for Industry Standard XD7660 and Other Second Source Devices • Pb-Free Available (RoHS Compliant) Applications Each chip contains a series DC power supply regulator, RC oscillator, voltage level translator, and four output power MOS switches. The oscillator, when unloaded, oscillates at a nominal frequency of 10kHz for an input supply voltage of 5.0V. This frequency can be lowered by the addition of an external capacitor to the “OSC” terminal, or the oscillator may be over-driven by an external clock. • Simple Conversion of +5V to ±5V Supplies • Voltage Multiplication VOUT = ±nVIN • Negative Supplies for Data Acquisition Systems and Instrumentation • RS232 Power Supplies • Supply Splitter, VOUT = ±VS The “LV” terminal may be tied to GND to bypass the internal series regulator and improve low voltage (LV) operation. At medium to high voltages (3.5V to 12V), the LV pin is left floating to prevent device latchup. In some applications, an external Schottky diode from VOUT to CAP- is needed to guarantee latchup free operation (see Do’s and Dont’s section on page 8). Pin Configurations XD7660 (8 LD PDIP, SOIC) TOP VIEW XL7660 (8 LD PDIP, SOIC) TOP VIEW BOOST 1 8 V+ CAP+ 2 7 OSC GND 3 6 CAP- 4 5 NC 1 8 V+ CAP+ 2 7 OSC LV GND 3 6 LV VOUT CAP- 4 5 VOUT 1 XD7660 DIP8 / XL7660 SOP8 Absolute Maximum Ratings Operating Conditions Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +13.0V LV and OSC Input Voltage (Note 5) V+ < 5.5V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to V+ + 0.3V V+ > 5.5V . . . . . . . . . . . . . . . . . . . . . . . . . . . V+ -5.5V to V+ +0.3V Current into LV (Note 5) V+ > 3.5V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20µA Output Short Duration VSUPPLY ≤ 5.5V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous Temperature Range XD/XL7660. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C 7660 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and result in failures not covered by warranty. NOTES: 5. Connecting any terminal to voltages greater than V+ or less than GND may cause destructive latchup. It is recommended that no inputs from sources operating from external supplies be applied prior to “power up” of XD/XL7660 6. θJA is measured with the component mounted on a low effective thermal conductivity test board in free air. See Tech Brief TB379 for details. 7. For θJC, the “case temp” location is taken at the package top center. 8. Pb-free PDIPs can be used for through-hole wave solder processing only. They are not intended for use in reflow solder processing applications. Electrical Specifications PARAMETER Supply Current (Note 11) XD/XL7660, V+ = 5V, T A = +25°C, OSC = Free running (see Figure 12, “XD7660 Test Circuit” on page 7 and Figure 13 “XL7660 Test Circuit” on page 7), unless otherwise specified. MIN (Note 9) TYP MAX (Note 9) UNITS RL = ∞ , +25°C - 80 160 µA 0°C < TA < +70°C - - 180 µA -40°C < TA < +85°C - - 180 µA -55°C < TA < +125°C - - 200 µA SYMBOL I+ TEST CONDITIONS Supply Voltage Range - High (Note 12) V+H RL = 10k, LV Open, TMIN < TA < TMAX 3.0 - 12 V Supply Voltage Range - Low V+L RL = 10k, LV to GND, TMIN < TA < TMAX 1.5 - 3.5 V IOUT = 20mA - 60 100 Ω IOUT = 20mA, 0°C < TA < +70°C - - 120 Ω IOUT = 20mA, -25°C < TA < +85°C - - 120 Ω IOUT = 20mA, -55°C < TA < +125°C - - 150 Ω IOUT = 3mA, V+ = 2V, LV = GND, 0°C < TA < +70°C - - 250 Ω IOUT = 3mA, V+ = 2V, LV = GND, -40°C < TA < +85°C - - 300 Ω IOUT = 3mA, V+ = 2V, LV = GND, -55°C < TA < +125°C - - 400 Ω COSC = 0, Pin 1 Open or GND 5 10 - kHz COSC = 0, Pin 1 = V+ - 35 - kHz RL = 5kΩ 96 98 - % TMIN < TA < TMAX RL = 5kΩ 95 97 - - RL = ∞ 99 99.9 - % Output Source Resistance Oscillator Frequency (Note 10) Power Efficiency Voltage Conversion Efficiency ROUT fOSC PEFF VOUTEFF 2 XD7660 DIP8 / XL7660 SOP8 Electrical Specifications PARAMETER Oscillator Impedance XD/XL7660, V+ = 5V, T A = +25°C, OSC = Free running (see Figure 12, “XD7660 Test Circuit” on page 7 and Figure 13 “XL7660 Test Circuit” on page 7), unless otherwise specified. (Continued) MIN (Note 9) TYP MAX (Note 9) UNITS V+ = 2V - 1 - MΩ V+ = 5V - 100 - kΩ SYMBOL ZOSC TEST CONDITIONS XD/XL7660, V+ = 3V, A T = 25°C, OSC = Free running, Test Circuit Figure 13, unless otherwise specified Supply Current (Note 13) Output Source Resistance Oscillator Frequency (Note 13) I+ ROUT fOSC V+ = 3V, RL = ∞ , +25°C - 26 100 μA 0°C < TA < +70°C - - 125 μA -40°C < TA < +85°C - - 125 μA V+ = 3V, IOUT = 10mA - 97 150 Ω 0°C < TA < +70°C - - 200 Ω -40°C < TA < +85°C - - 200 Ω V+ = 3V (same as 5V conditions) 5.0 8 - kHz 0°C < TA < +70°C 3.0 - - kHz -40°C < TA < +85°C 3.0 - - kHz NOTES: 9. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization and are not production tested. 10. 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, on the order of 5pF. 11. The Intersil XD/XL7660 can operate without an extern al diode over the full temperature and voltage range. This device will function in existing designs that incorporate an external diode with no degradation in overall circuit performance. 12. All significant improvements over the industry standard XD7660 are highlighted. 13. Derate linearly above 50°C by 5.5mW/°C. 3 XD7660 DIP8 / XL7660 SOP8 Functional Block Diagram 8 OSC LV 7 Q1 VOLTAGE LEVEL TRANSLATOR OSCILLATOR AND DIVIDE-BY2 COUNTER V+ 2 Q2 3 CAP+ GND 6 Q4 INTERNAL SUPPLY REGULATOR 4 5 Q3 3 CAPVOUT SUBSTRATE LOGIC NETWORK 3 3 Typical Performance Curves See Figure 12, “XD7660 Test Circuit” on page 7) and Figure 13 “XL7660 Test Circuit” on page 7 12 OUTPUT SOURCE RESISTANCE (Ω) 250 SUPPLY VOLTAGE (V) 10 8 SUPPLY VOLTAGE RANGE (NO DIODE REQUIRED) 6 4 2 0 TA = +125°C 200 TA = +25°C 150 TA = -55°C 100 50 0 -55 -25 0 25 50 100 125 0 2 4 FIGURE 1. OPERATING VOLTAGE AS A FUNCTION OF TEMPERATURE POWER CONVERSION EFFICIENCY (%) OUTPUT SOURCE RESISTANCE (Ω) 300 250 IOUT = 3mA, IOUT = 20mA, V+ = 5V V+ = 2V 150 IOUT = 20mA, V+ = 5V 100 50 IOUT = 20mA, V+ = 12V 0 -50 -25 0 25 50 8 10 12 FIGURE 2. OUTPUT SOURCE RESISTANCE AS A FUNCTION OF SUPPLY VOLTAGE 350 200 6 SUPPLY VOLTAGE (V) TEMPERATURE (°C) 75 100 125 98 96 94 92 V+ = 5V TA = +25°C IOUT = 1mA 90 88 86 84 82 80 100 1k 10k OSC FREQUENCY fOSC (Hz) TEMPERATURE (°C) FIGURE 3. OUTPUT SOURCE RESISTANCE AS A FUNCTION OF TEMPERATURE FIGURE 4. POWER CONVERSION EFFICIENCY AS A FUNCTION OF OSCILLATOR FREQUENCY 4 50k XD7660 DIP8 / XL7660 SOP8 Typical Performance Curves See Figure 12, “XD7660 Test Circuit” on page 7) and Figure 13 “XL7660 Test Circuit” on page 7 20 V+ = 5V TA = +25°C 9 OSCILLATOR FREQUENCY fOSC (kHz) 8 7 6 5 4 3 2 1 18 16 14 V+ = 10V 12 10 V+ = 5V 8 0 10 COSC (pF) 100 -55 1k POWER CONVERSION EFFICIENCY (%) V+ = 5V OUTPUT VOLTAGE (V) 25 50 75 100 TA = +25°C -1 -2 -3 -4 100 100 90 90 80 80 70 70 60 60 50 50 40 40 30 30 20 V+ = 5V 20 10 TA = +25°C 10 0 0 -5 0 10 125 FIGURE 6. UNLOADED OSCILLATOR FREQUENCY AS A FUNCTION OF TEMPERATURE 1 20 30 LOAD CURRENT (mA) 0 40 10 20 30 40 50 60 LOAD CURRENT (mA) FIGURE 7. OUTPUT VOLTAGE AS A FUNCTION OF OUTPUT CURRENT FIGURE 8. SUPPLY CURRENT AND POWER CONVERSION EFFICIENCY AS A FUNCTION OF LOAD CURRENT 2 100 V+ = 2V TA = +25°C 90 1 POWER CONVERSION EFFICIENCY (%) OUTPUT VOLTAGE (V) 0 TEMPERATURE (°C) FIGURE 5. FREQUENCY OF OSCILLATION AS A FUNCTION OF EXTERNAL OSCILLATOR CAPACITANCE 0 -25 SUPPLY CURRENT (mA) 1 0 -1 80 16 70 14 60 12 50 10 40 8 30 0 0 1 2 3 4 5 6 7 8 9 LOAD CURRENT (mA) 4 TA = +25°C 10 -2 6 V+ = 2V 20 0 1.5 3.0 4.5 6.0 2 7.5 9.0 SUPPLY CURRENT (mA) (NOTE 12) OSCILLATOR FREQUENCY fOSC (kHz) 10 (Continued) 0 LOAD CURRENT (mA) FIGURE 9. OUTPUT VOLTAGE AS A FUNCTION OF OUTPUT CURRENT FIGURE 10. SUPPLY CURRENT AND POWER CONVERSION EFFICIENCY AS A FUNCTION OF LOAD CURRENT 5 XD7660 DIP8 / XL7660 SOP8 Typical Performance Curves OUTPUT RESISTANCE (Ω) See Figure 12, “XD7660 Test Circuit” on page 7) and Figure 13 “XL7660 Test Circuit” on page 7 400 V+ = 5V TA = +25°C I = 10mA (Continued) C1 = C2 = 1mF C1 = C2 = 10mF 300 C1 = C2 = 100mF 200 100 0 100 1k 10k 100k OSCILLATOR FREQUENCY (Hz) FIGURE 11. OUTPUT SOURCE RESISTANCE AS A FUNCTION OF OSCILLATOR FREQUENCY NOTE: 14. These curves include, in the supply current, that current fed directly into the load RL from the V+ (see Figure 12). Thus, approximately half the supply current goes directly to the positive side of the load, and the other half, through the XD/XL7660, goes to the negative side of the load. Ideally, VOUT ∼ 2VIN, IS ∼ 2IL, so VIN x IS ∼ VOUT x IL. IS V+ V+ C1 + 10µF - IS V+ 1 8 2 7 IL 3 6 RL 4 5 XD7660 1 (+5V) 2 C1 + 10µF - -VOUT C2 10µF 8 XL7660 7 3 6 4 5 IL RL COSC (NOTE) + (+5V) -VOUT C2 10µF + NOTE: For large values of COSC (>1000pF), the values of C1 and C2 should be increased to 100µF. NOTE: For large values of COSC (>1000pF) the values of C1 and C2 should be increased to 100μF. FIGURE 12.XD7660 TEST CIRCUIT FIGURE 13.XL7660 TEST CIRCUIT 6 XD7660 DIP8 / XL7660 SOP8 V+ 8 S1 2 S2 1 VIN 2 C1 3 8 3 XD/XL7660 3 4 7 D1 6 D2 5 + S4 C1 - 5 4 - + C2 S3 VOUT = (2V+) - (2VF) C2 VOUT = -VIN NOTE: D1 AND D2 CAN BE ANY SUITABLE DIODE. FIGURE 18. POSITIVE VOLTAGE DOUBLER 7 V+ FIGURE 14. IDEALIZED NEGATIVE VOLTAGE CONVERTER 1 2 V+ C1 10µF + 1 8 2 7 XD/XL7660 3 - 3 - RO 10µF + 15A. - 1 8 2 7 XD/XL7660 D2 + VOUT = (2V+) (VFD1) - (VFD2) + C - 4 FIGURE 19. COMBINED NEGATIVE VOLTAGE CONVERTER AND POSITIVE DOUBLER 15B. V+ + 3 6 4 5 1 V+ 1kΩ 50µF CMOS GATE 8 2 + 3 - RL2 50µF 7 XD/XL7660 4 + 6 5 - VOUT - V+ + 50µF VOUT = V+ - V2 V- 10µF + FIGURE 20. SPLITTING A SUPPLY IN HALF FIGURE 16. EXTERNAL CLOCKING 50k +8V 56k 50k V+ C1 + - 1 8 2 7 3 4 XD/XL7660 C3 D3 RL1 10µF + C2 VOUT V+ + VOUT = -V+ D1 6 5 - 5 - 7 XD/XL7660 4 6 4 + VOUT = -VIN 8 100k + + 10µF 1 8 2 8069 - 100Ω 7611 + COSC 6 5 - +8V 100µF + - VOUT 3 7 XD/XL7660 4 6 5 VOUT C2 800k FIGURE 17. LOWERING OSCILLATOR FREQUENCY 250k VOLTAGE ADJUST + 100µF FIGURE 21. REGULATING THE OUTPUT VOLTAGE 7 XD7660 DIP8 / XL7660 SOP8 78 XD7660 DIP8 / XL7660 SOP8 79