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ICL7660ACBAZA

hot ICL7660ACBAZA

ICL7660ACBAZA

For Reference Only

Part Number ICL7660ACBAZA
Manufacturer Renesas Electronics America
Description IC REG SWTCHD CAP INV 45MA 8SOIC
Datasheet ICL7660ACBAZA Datasheet
Package 8-SOIC (0.154", 3.90mm Width)
In Stock 30000 piece(s)
Unit Price $ 1.74 *
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ICL7660ACBAZA Specifications

ManufacturerRenesas Electronics America
CategoryIntegrated Circuits (ICs) - PMIC - Voltage Regulators - DC DC Switching Regulators
Datasheet ICL7660ACBAZA Datasheet
Package8-SOIC (0.154", 3.90mm Width)
Series-
FunctionRatiometric
Output ConfigurationPositive or Negative
TopologyCharge Pump
Output TypeFixed
Number of Outputs1
Voltage - Input (Min)1.5V
Voltage - Input (Max)12V
Voltage - Output (Min/Fixed)-Vin, 2Vin
Current - Output45mA
Frequency - Switching3kHz
Synchronous RectifierNo
Operating Temperature0°C ~ 70°C (TA)
Mounting TypeSurface Mount
Package / Case8-SOIC (0.154", 3.90mm Width)
Supplier Device Package8-SOIC

ICL7660ACBAZA Datasheet

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FN3179 Rev 7.00 January 23, 2013 ICL7660S, ICL7660A Super Voltage Converters DATASHEETThe ICL7660S and ICL7660A 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 ICL7660 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. The ICL7660S and ICL7660A 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 ICL7660S and ICL7660A 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. 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. 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). Features • 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 • Simple Voltage Multiplication VOUT = (-)nVIN • Easy to Use; Requires Only Two External Non-Critical Passive Components • Improved Direct Replacement for Industry Standard ICL7660 and Other Second Source Devices • Pb-Free Available (RoHS Compliant) Applications • 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 Pin Configurations ICL7660S (8 LD PDIP, SOIC) TOP VIEW ICL7660A (8 LD PDIP, SOIC) TOP VIEW BOOST CAP+ GND CAP- 1 2 3 4 8 7 6 5 V+ OSC LV VOUT NC CAP+ GND CAP- 1 2 3 4 8 7 6 5 V+ OSC LV VOUTFN3179 Rev 7.00 Page 1 of 13 January 23, 2013

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ICL7660S, ICL7660AOrdering Information PART NUMBER (NOTE 3) PART MARKING TEMP. RANGE (°C) PACKAGE PKG. DWG. # ICL7660SCBA (Note 1) 7660 SCBA 0 to +70 8 Ld SOIC M8.15 ICL7660SCBAZ (Notes 1, 2) 7660 SCBAZ 0 to +70 8 Ld SOIC (Pb-free) M8.15 ICL7660SCPA 7660S CPA 0 to +70 8 Ld PDIP E8.3 ICL7660SCPAZ (Note 2) 7660S CPAZ 0 to +70 8 Ld PDIP (Pb-free; Note 4) E8.3 ICL7660SIBA (Note 1) 7660 SIBA -40 to +85 8 Ld SOIC M8.15 ICL7660SIBAZ (Notes 1, 2) 7660 SIBAZ -40 to +85 8 Ld SOIC (Pb-free) M8.15 ICL7660SIPA 7660 SIPA -40 to +85 8 Ld PDIP E8.3 ICL7660SIPAZ (Note 2) 7660S IPAZ -40 to +85 8 Ld PDIP (Pb-free; Note 4) E8.3 ICL7660ACBA (Note 1) 7660ACBA 0 to 70 8 Ld SOIC (N) M8.15 ICL7660ACBAZA (Notes 1, 2) 7660ACBAZ 0 to 70 8 Ld SOIC (N) (Pb-free) M8.15 ICL7660ACPA 7660ACPA 0 to 70 8 Ld PDIP E8.3 ICL7660ACPAZ (Note 2) 7660ACPAZ 0 to 70 8 Ld PDIP (Pb-free; Note 4) E8.3 ICL7660AIBA (Note 1) 7660AIBA -40 to 85 8 Ld SOIC (N) M8.15 ICL7660AIBAZA (Notes 1, 2) 7660AIBAZ -40 to 85 8 Ld SOIC (N) (Pb-free) M8.15 NOTES: 1. Add “-T*” suffix for tape and reel. Please refer to TB347 for details on reel specifications. 2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 3. For Moisture Sensitivity Level (MSL), please see device information page for ICL7660S, ICL7660A. For more information on MSL, please see Tech Brief TB363. 4. Pb-free PDIPs can be used for through-hole wave solder processing only. They are not intended for use in reflow solder processing applications.FN3179 Rev 7.00 Page 2 of 13 January 23, 2013

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ICL7660S, ICL7660AAbsolute Maximum Ratings Thermal Information 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 Operating Conditions Temperature Range ICL7660SI, ICL7660AI . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C ICL7660SC, ICL7660AC . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C Thermal Resistance (Typical, Notes 6, 7) JA (°C/W) JC (°C/W) 8 Ld PDIP* . . . . . . . . . . . . . . . . . . . . . . 110 59 8 Ld Plastic SOIC. . . . . . . . . . . . . . . . . 160 48 Storage Temperature Range . . . . . . . . . . . . . . . . . . -65°C to +150°C Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . .see link below http://www.intersil.com/pbfree/Pb-FreeReflow.asp *Pb-free PDIPs can be used for through-hole wave solder processing only. They are not intended for use in reflow solder processing applications. 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 ICL7660S and ICL7660A. 6. JA 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 JC, 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 ICL7660S and ICL7660A, V+ = 5V, TA = +25°C, OSC = Free running (see Figure 12, “ICL7660S Test Circuit” on page 7 and Figure 13 “ICL7660A Test Circuit” on page 7), unless otherwise specified. PARAMETER SYMBOL TEST CONDITIONS MIN (Note 9) TYP MAX (Note 9) UNITS Supply Current (Note 11) I+ 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 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 Output Source Resistance ROUT IOUT = 20mA - 60 100  IOUT = 20mA, 0°C < TA < +70°C - - 120  IOUT = 20mA, -25°C < TA < +85°C - - 120  IOUT = 20mA, -55°C < TA < +125°C - - 150  IOUT = 3mA, V+ = 2V, LV = GND, 0°C < TA < +70°C - - 250  IOUT = 3mA, V+ = 2V, LV = GND, -40°C < TA < +85°C - - 300  IOUT = 3mA, V+ = 2V, LV = GND, -55°C < TA < +125°C - - 400  Oscillator Frequency (Note 10) fOSC COSC = 0, Pin 1 Open or GND 5 10 - kHz COSC = 0, Pin 1 = V+ - 35 - kHz Power Efficiency PEFF RL = 5k 96 98 - % TMIN < TA < TMAX RL = 5k 95 97 - - Voltage Conversion Efficiency VOUTEFF RL =  99 99.9 - %FN3179 Rev 7.00 Page 3 of 13 January 23, 2013

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ICL7660S, ICL7660AOscillator Impedance ZOSC V+ = 2V - 1 - M V+ = 5V - 100 - k ICL7660A, V+ = 3V, TA = 25°C, OSC = Free running, Test Circuit Figure 13, unless otherwise specified Supply Current (Note 13) I+ V+ = 3V, RL = , +25°C - 26 100 A 0°C < TA < +70°C - - 125 A -40°C < TA < +85°C - - 125 A Output Source Resistance ROUT V+ = 3V, IOUT = 10mA - 97 150  0°C < TA < +70°C - - 200  -40°C < TA < +85°C - - 200  Oscillator Frequency (Note 13) fOSC 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 ICL7660S and ICL7660A can operate without an external 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 ICL7660 are highlighted. 13. Derate linearly above 50°C by 5.5mW/°C. Electrical Specifications ICL7660S and ICL7660A, V+ = 5V, TA = +25°C, OSC = Free running (see Figure 12, “ICL7660S Test Circuit” on page 7 and Figure 13 “ICL7660A Test Circuit” on page 7), unless otherwise specified. (Continued) PARAMETER SYMBOL TEST CONDITIONS MIN (Note 9) TYP MAX (Note 9) UNITSFN3179 Rev 7.00 Page 4 of 13 January 23, 2013

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ICL7660S, ICL7660AFunctional Block Diagram VOLTAGE LEVEL TRANSLATOR SUBSTRATE NETWORK OSC LV V+ CAP+ CAP- 7 OSCILLATOR AND DIVIDE-BY- 2 COUNTER 6 INTERNAL SUPPLY REGULATOR 3 LOGIC Q3 3 Q1 VOUT 3 8 2 Q2 3 4 5 Q4 GND Typical Performance Curves See Figure 12, “ICL7660S Test Circuit” on page 7) and Figure 13 “ICL7660A Test Circuit” on page 7 FIGURE 1. OPERATING VOLTAGE AS A FUNCTION OF TEMPERATURE FIGURE 2. OUTPUT SOURCE RESISTANCE AS A FUNCTION OF SUPPLY VOLTAGE FIGURE 3. OUTPUT SOURCE RESISTANCE AS A FUNCTION OF TEMPERATURE FIGURE 4. POWER CONVERSION EFFICIENCY AS A FUNCTION OF OSCILLATOR FREQUENCY -55 -25 0 25 50 100 125 12 10 8 6 4 2 0 S U P P LY V O LT A G E ( V ) TEMPERATURE (°C) SUPPLY VOLTAGE RANGE (NO DIODE REQUIRED) 250 200 150 100 50 0 0 2 4 6 8 10 12 SUPPLY VOLTAGE (V) O U T P U T S O U R C E R E S IS TA N C E ( Ω ) TA = +125°C TA = +25°C TA = -55°C 350 300 250 200 150 100 50 0 O U T P U T S O U R C E R E S IS TA N C E ( Ω ) -50 -25 0 25 50 75 100 125 TEMPERATURE (°C) IOUT = 20mA, V+ = 12V IOUT = 20mA, V+ = 5V IOUT = 20mA, V+ = 5V IOUT = 3mA, V+ = 2V 98 96 94 92 90 88 86 84 82 80 P O W E R C O N V E R S IO N E F F IC IE N C Y ( % ) 100 1k 10k 50k OSC FREQUENCY fOSC (Hz) V+ = 5V TA = +25°C IOUT = 1mAFN3179 Rev 7.00 Page 5 of 13 January 23, 2013

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ICL7660S, ICL7660AFIGURE 5. FREQUENCY OF OSCILLATION AS A FUNCTION OF EXTERNAL OSCILLATOR CAPACITANCE FIGURE 6. UNLOADED OSCILLATOR FREQUENCY AS A FUNCTION OF TEMPERATURE FIGURE 7. OUTPUT VOLTAGE AS A FUNCTION OF OUTPUT CURRENT FIGURE 8. SUPPLY CURRENT AND POWER CONVERSION EFFICIENCY AS A FUNCTION OF LOAD CURRENT FIGURE 9. OUTPUT VOLTAGE AS A FUNCTION OF OUTPUT CURRENT FIGURE 10. SUPPLY CURRENT AND POWER CONVERSION EFFICIENCY AS A FUNCTION OF LOAD CURRENT Typical Performance Curves See Figure 12, “ICL7660S Test Circuit” on page 7) and Figure 13 “ICL7660A Test Circuit” on page 7 (Continued) 1 10 100 1k O S C IL L A T O R F R E Q U E N C Y f O S C ( kH z) 10 9 8 7 6 5 4 3 2 1 0 COSC (pF) V+ = 5V TA = +25°C O S C IL L A T O R F R E Q U E N C Y f O S C ( k H z) 20 18 16 14 12 10 8 -55 -25 0 25 50 75 100 125 TEMPERATURE (°C) V+ = 10V V+ = 5V O U T P U T V O LT A G E ( V ) 1 0 -1 -2 -3 -4 -5 0 10 20 30 40 LOAD CURRENT (mA) V+ = 5V TA = +25°C P O W E R C O N V E R S IO N E F F IC IE N C Y ( % ) 100 90 80 70 60 50 40 30 20 10 0 100 90 80 70 60 50 40 30 20 10 0 LOAD CURRENT (mA) 0 10 20 30 40 50 60 V+ = 5V TA = +25°C S U P P LY C U R R E N T ( m A ) O U T P U T V O LT A G E ( V ) 2 1 0 -1 -2 0 1 2 3 4 5 6 7 8 9 LOAD CURRENT (mA) TA = +25°C V+ = 2V 100 90 80 70 60 50 40 30 20 10 0 16 14 12 10 8 6 4 2 0 0 1.5 3.0 4.5 6.0 7.5 9.0 LOAD CURRENT (mA) V+ = 2V TA = +25°C P O W E R C O N V E R S IO N E F F IC IE N C Y ( % ) S U P P LY C U R R E N T ( m A ) (N O T E 1 2 ) FN3179 Rev 7.00 Page 6 of 13 January 23, 2013

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ICL7660S, ICL7660AFIGURE 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 ICL7660S and ICL7660A, goes to the negative side of the load. Ideally, VOUT 2VIN, IS  2IL, so VIN x IS  VOUT x IL. Typical Performance Curves See Figure 12, “ICL7660S Test Circuit” on page 7) and Figure 13 “ICL7660A Test Circuit” on page 7 (Continued) O U T P U T R E S IS TA N C E ( Ω ) 400 300 200 100 0 100 1k 10k 100k OSCILLATOR FREQUENCY (Hz) V+ = 5V TA = +25°C I = 10mA C1 = C2 = 10mF C1 = C2 = 1mF C1 = C2 = 100mF 1 2 3 4 8 7 6 5 + - C1 10µF IS V+ (+5V) IL RL -VOUT C2 10µF ICL7660S V+ + - NOTE: For large values of COSC (>1000pF), the values of C1 and C2 should be increased to 100µF. FIGURE 12. ICL7660S TEST CIRCUIT NOTE: For large values of COSC (>1000pF) the values of C1 and C2 should be increased to 100F. FIGURE 13. ICL7660A TEST CIRCUIT 1 2 3 4 8 7 6 5 + - C1 10µF IS V+ (+5V) IL RL -VOUT C2 10µF ICL7660A COSC + - (NOTE)FN3179 Rev 7.00 Page 7 of 13 January 23, 2013

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ICL7660S, ICL7660ADetailed Description The ICL7660S and ICL7660A contain all the necessary circuitry to complete a negative voltage converter, with the exception of two external capacitors, which may be inexpensive 10µF polarized electrolytic types. The mode of operation of the device may best be understood by considering Figure 14, 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 to C2 such that the voltage on C2 is exactly V+, assuming ideal switches and no load on C2. The ICL7660S and ICL7660A approach this ideal situation more closely than existing non-mechanical circuits. In the ICL7660S and ICL7660A, the four switches of Figure 14 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 latch-up. This problem is eliminated in the ICL7660S and ICL7660A by a logic network that 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 ICL7660S and ICL7660A 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, thus disabling the regulator. For supply voltages greater than 3.5V, the LV terminal must be left open to ensure latchup-proof operation and to prevent device damage. Theoretical Power Efficiency Considerations In theory, a voltage converter can approach 100% efficiency if certain conditions are met: 1. The drive circuitry consumes minimal power. 2. The output switches have extremely low ON resistance and virtually no offset. 3. The impedance of the pump and reservoir capacitors are negligible at the pump frequency. The ICL7660S and ICL7660A approach 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 as shown in Equation 1: 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 (see Figure 14) compared to the value of RL, there will be a substantial difference in the voltages, V1 and V2. Therefore it is not only desirable 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. Do’s and Don’ts 1. Do not exceed maximum supply voltages. 2. Do not connect LV terminal to GND for supply voltage greater than 3.5V. 3. Do not short circuit the output to V+ supply for supply voltages above 5.5V for extended periods; however, transient conditions including start-up are okay. 4. When using polarized capacitors, the + terminal of C1 must be connected to pin 2 of the ICL7660S and ICL7660A, and the + terminal of C2 must be connected to GND. 5. If the voltage supply driving the ICL7660S and ICL7660A has a large source impedance (25 to 30), then a 2.2µF capacitor from pin 8 to ground may be required to limit the rate of rise of input voltage to less than 2V/µs. 6. If the input voltage is higher than 5V and it has a rise rate more than 2V/µs, an external Schottky diode from VOUT to CAP- is needed to prevent latchup (triggered by forward biasing Q4’s body diode) by keeping the output (pin 5) from going more positive than CAP- (pin 4). 7. User should ensure that the output (pin 5) does not go more positive than GND (pin 3). Device latch-up will occur under these conditions. To provide additional protection, a 1N914 or similar diode placed in parallel with C2 will prevent the device from latching up under these conditions, when the load on VOUT creates a path to pull up VOUT before the IC is active (anode pin 5, cathode pin 3). VOUT = -VIN C2 VIN C1 S3 S4 S1 S28 2 4 3 3 5 7 FIGURE 14. IDEALIZED NEGATIVE VOLTAGE CONVERTER E 1 2 --C1 V1 2 V2 2– = (EQ. 1)FN3179 Rev 7.00 Page 8 of 13 January 23, 2013

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ICL7660S, ICL7660ATypical Applications Simple Negative Voltage Converter The majority of applications will undoubtedly utilize the ICL7660S and ICL7660A for generation of negative supply voltages. Figure 15 shows typical connections to provide a negative supply where a positive supply of +1.5V to +12V is available. Keep in mind that pin 6 (LV) is tied to the supply negative (GND) for supply voltage below 3.5V. The output characteristics of the circuit in Figure 15 can be approximated by an ideal voltage source in series with a resistance as shown in Figure 15B. 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 14), 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 shown in Equation 2: Combining the four RSWX terms as RSW, we see in Equation 3 that: RSW, the total switch resistance, is a function of supply voltage and temperature (see the output source resistance graphs, Figures 2, 3, and 11), typically 23 at +25°C and 5V. Careful selection of C1 and C2 will reduce the remaining terms, minimizing the output impedance. High value capacitors will reduce the 1/(fPUMP x C1) component, and low ESR capacitors will lower the ESR term. Increasing the oscillator frequency will reduce the 1/(fPUMP x C1) term, but may have the side effect of a net increase in output impedance when C1 > 10µF and is not long enough to fully charge the capacitors every cycle. Equation 4 shows a typical application where fOSC = 10kHz and C = C1 = C2 = 10µF: 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 x C1 term, rendering an increase in switching frequency or filter capacitance ineffective. Typical electrolytic capacitors may have ESRs as high as 10. Output Ripple ESR also affects the ripple voltage seen at the output. The peak-to-peak output ripple voltage is given by Equation 5: A low ESR capacitor will result in a higher performance output. Paralleling Devices Any number of ICL7660S and ICL7660A voltage converters may be paralleled to reduce output resistance. The reservoir capacitor, C2, serves all devices, while each device requires its own pump capacitor, C1. The resultant output resistance is approximated in Equation 6: Cascading Devices The ICL7660S and ICL7660A 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 as shown in Equation 7: where n is an integer representing the number of devices cascaded. The resulting output resistance would be approximately the weighted sum of the individual ICL7660S and ICL7660A ROUT values. Changing the ICL7660S and ICL7660A Oscillator Frequency It may be desirable in some applications, due to noise or other considerations, to alter the oscillator frequency. This can be achieved simply by one of several methods. 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 3.5 times. The result is a decrease in the output impedance and ripple. 1 2 3 4 8 7 6 5 + - 10µF 10µF ICL7660S VOUT = -V+ V+ + - RO VOUT V+ + - 15A. 15B. FIGURE 15. SIMPLE NEGATIVE CONVERTER AND ITS OUTPUT EQUIVALENT ICL7660A R0 2 RSW1 RSW3 ESRC1+ +  2 RSW2 RSW4 ESRC1+ + +  (EQ. 2) 1 fPUMP C1 ------------------------------- ESRC2+ fPUMP fOSC 2 -------------= RSWX MOSFET Switch Resistance=  R0 2xRSW 1 fPUMP C1 ------------------------------- 4xESRC1 ESRC2+ + + (EQ. 3) R0 2x23 1 5 10 3 10 10 6– -------------------------------------------------- 4xESRC1 ESRC2+ + + (EQ. 4) R0 46 20 5+ + ESRC VRIPPLE 1 2 fPUMP C2 ----------------------------------------- 2ESRC2 IOUT+    (EQ. 5) ROUT ROUT of ICL7660S  n number of devices  ---------------------------------------------------------= (EQ. 6) VOUT n VIN –= (EQ. 7)FN3179 Rev 7.00 Page 9 of 13 January 23, 2013

ICL7660ACBAZA Reviews

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Ver*****uresh

November 30, 2019

Used this on starter solenoid and works as expected.

Oli***** Roy

September 24, 2019

Heisener parametric search for specific components is by far better than their competitors.

Lan*****ule

September 12, 2019

Received Quickly. Excellent Communication. Capacitors Look Excellent.

Ale***** Hill

August 31, 2019

Have never had a problem with my order. Packages arrive on time and in great condition.

Riy*****oshy

August 3, 2019

To be honest, you're beating your competitor on delivery - sometimes I request 2nd day and you still get it here overnight. Thanks!

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July 29, 2019

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April 23, 2019

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Marco*****haria

February 26, 2019

Can't speak to the long term reliability as of yet, but they seem to be of decent quality and I don't expect any issues.

Fern***** Bal

February 12, 2019

As I said before, your crew rock's keep up the fantastic work as we need you out there.

Dari*****illa

February 6, 2019

I have always get a fast response from Heisener with my orders. As a small business owner I greatly appreciate that I can order as little as 1 item as opposed to other companies who require you place a larger minimum order.

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