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| AIC7660 Switched-Capacitor Voltage Converter FEATURES Lowest Output Impedance (Typical 35 at VIN=5V). Improved Direct Replacement for the Popular 7660. 1.5V to 6V Operation. No External Diode Required. Simple Conversion of +5V to -5V. Low Quiescent Current (Typical 36A at VIN=5V). High Power Efficiency (Typical 98%) Boost Pin for Higher Switching Frequency. Improved SCR Latch-up Protection. DESCRIPTION The AIC7660 is a monolithic CMOS switched capacitor voltage converter. Designed to be an improved direct replacement for the popular 7660 and LTC1044, the main function of the AIC7660 is to convert a positive input voltage in the range of 1.5V to 6V to the corresponding negative output voltage in the range of -1.5V to -6V. The input voltage can also be doubled (VOUT = 2VIN), divided (VOUT = VIN /2), or multiplied (VOUT = nVIN), as shown in application examples. The chip contains a series DC power supply APPLICATIONS RS-232 Power Supplies. Handheld Instruments. Data Acquisition Systems. Supply Splitter, VOUT= VIN /2. Operational Amplifier Supplies. Panel Meter. regulator, oscillator, control circuitry and four output power MOS switches. The frequency of oscillator can be lowered by the addition of an external capacitor to the OSC pin, or the oscillator may be over-driven by an external clock. The boost function is available to raise the oscillator frequency to optimize performance in specific applications. The "LV" terminal may be tied to GND to improve low input voltage (VIN 3.0V) operation, or be left floating for input TYPICAL APPLICATION CIRCUIT 1 BOOST 2 CAP+ GND CAP- VIN OSC LV 8 7 6 VIN=5V voltage larger than 3.0V to improve power dissipation. The AIC7660 provides performance superior to previous designs by combining low output 10F C1 + 3 4 VOUT 5 VOUT=-5V + 10F C2 impedance, low quiescent current with high efficiency, and by eliminating diode drop voltage losses. The only required external components are two low cost electrolytic capacitors. AIC7660 Negative Voltage Converter Analog Integrations Corporation Si-Soft Research Center 3A1, No.1, Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan, R.O.C. TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw DS-7660P-01 112206 1 AIC7660 ORDERING INFORMATION AIC7660XXXX PACKING TYPE TR: TAPE & REEL TB: TUBE PACKAGE TYPE N8: DIP-8 S8: SOP-8 P: LEAD FREE COMMERCIAL PIN CONFIGURATION DIP-8, SOP-8 TOP VIEW BOOST CAP+ GND CAP- 1 2 3 4 8 7 6 5 VIN OSC LV VOUT Example: AIC7660PS8TR in Lead Free SOP-8 Package & Tape & Reel Packing Type (PN8 is not available in TR packing type.) ABSOLUTE MAXIMUM RATINGS Supply Voltage (VIN to GND, or GND to VOUT) Input Voltage on Pin 1, 6 and 7 Operating Temperature Range Junction Temperature Storage Temperature Range Lead Temperature (Soldering, 10sec) Thermal Resistance Junction to Case, RJC DIP-8 SOP-8 Thermal Resistance Junction to Ambient, RJA DIP-8 (Assume no ambient airflow, no heatsink) SOP-8 6.0V -0.3V ~ VIN + 0.3V -40C ~ 85C 125C -65C ~ 150C 260C 60C /W 40C /W 100C /W 160C /W Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. 2 AIC7660 TEST CIRCUIT 1 BOOST 2 10F + C1 CAP+ 8 7 6 COSC IS VIN OSC LV + CBYPASS 0.1F VIN IL RL 3 GND 4 CAP- VOUT 5 C2 10F VOUT + ELECTRICAL CHARACTERISTICS (VIN=5.0V, TA=25C, BOOST and LV pin Floating, OSC pin OPEN, unless otherwise specified.) (Note 1) PARAMETER Supply Current Minimum Supply Voltage Maximum Supply Voltage Output Resistance TEST CONDITIONS RL = RL = RL = IL =20mA, FOSC =10KHz COSC=0 Oscillator Frequency BOOST Pin=GND or Floating Boost Pin=VIN Power Efficiency RL= 5K, FOSC=10KHz VOUTEFF 96 98 SYMBOL IS VINL VINH ROUT FOSC 10 50 98 99.9 % % KHz 35 1.5 6 70 MIN TYP 30 MAX 50 UNIT A V V Voltage Conversion Efficiency RL = Note 1: Specifications are production tested at TA=25C. Specifications over the -40C to 85C operating temperature range are assured by design, characterization and correlation with Statistical Quality Controls (SQC). 3 AIC7660 TYPICAL PERFORMANCE CHARACTERISTICS 0.0 -0.5 -1.0 Boost/LV:Floating 0.0 -0.5 -1.0 Vin=3V Vin=4V Boost:Vin LV:GND Output Voltage (V) -2.0 -2.5 -3.0 -3.5 -4.0 -4.5 -5.0 -5.5 -6.0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Output Voltage (V) -1.5 Vin=3V -1.5 -2.0 -2.5 -3.0 -3.5 -4.0 -4.5 -5.0 -5.5 -6.0 0 5 10 15 20 25 Vin=4V Vin=5V Vin=6V Vin=5V Vin=6V 30 35 40 45 50 55 60 65 70 Fig. 1 0.0 -0.5 -1.0 Output Voltage vs. Load Current -0.5 Loading Current (mA) Fig. 2 -1.0 -1.5 Output Voltage vs. Load Current Boost:Floating LV:GND Vin=4V Vin=5V Vin=6V Loading Current (mA) Boost:Vin LV:Floating Vin=3V Vin=3V Output Voltage (V) -1.5 -2.0 -2.5 -3.0 -3.5 -4.0 -4.5 -5.0 -5.5 -6.0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Output Voltage (V) -2.0 -2.5 -3.0 -3.5 -4.0 -4.5 -5.0 -5.5 -6.0 0 5 10 15 20 25 30 Vin=4V Vin=5V Vin=6V 35 40 45 50 55 60 65 70 Loading Current (mA) Fig. 3 100 95 90 85 80 75 70 65 60 55 50 45 40 35 30 25 0 5 10 15 Output Voltage vs. Load Current 100 Fig. 4 Output Voltage vs. Load Current Loading Current (mA) Boost/LV:Floating Power Efficiency (%) 90 80 70 60 50 40 30 Boost:Vin LV:GND Power Efficiency (%) Vin=6V Vin=3V Vin=4V Vin=5V Vin=3V Vin=4V Vin=5V Vin=6V 20 25 30 35 40 45 50 55 60 65 70 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Fig. 5 Power Efficiency vs. Load Current Loading Current (mA) Fig. 6 Power Efficiency vs. Load Current Loading Current (mA) 4 AIC7660 TYPICAL PERFORMANCE CHARACTERISTICS 100 90 (Continued) Boost:Floating LV:GND 100 Boost:Vin LV:Floating 90 80 70 60 50 40 30 20 Power Efficiency (%) 80 70 60 50 40 Power Efficiency (%) Vin=6V Vin=3V Vin=4V Vin=5V Vin=5V Vin=3V Vin=4V Vin=6V 30 20 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Loading Current (mA) Loading Current (mA) Fig. 7 55 50 Power Efficiency vs. Load Current 35 30 25 20 15 10 Fig. 8 Power Efficiency vs. Load Current Vin = 5.0V Boost:Vin LV:floating 40 35 30 25 20 15 10 5 0 1 2 3 4 Boost:floating LV:GND 5 6 Boost/LV floating Boost:Vin LV:floating Boost:Vin LV:GND Oscillator Frequency, FOSC (KHz) Oscillator Frequency Fosc(KHz) 45 Boost:Vin LV:GND Boost/LV floating 5 0 Boost:floating LV:GND 10 100 1000 10000 Supply Voltage, Vin(V) Fig. 9 250 Oscillator Frequency vs. Supply Voltage 50 45 Fig. 10 Oscillator Frequency vs. External Capacitor External Capacitance, COSC (pF) 200 40 Supply Current (A) 150 Supply Current (A) 35 30 25 20 15 10 5 Boost/LV:Floating 100 Boost:VDD LV:floating 50 Boost:VDD LV:GND Boost:Floating Lv:GND Boost/LV floating Vin=5V -20 0 20 40 60 80 100 0 1.0 Boost:floating LV:GND 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 0 -40 Supply Voltage, Vin(V) Temperature ( C) o Fig. 11 Supply Current vs. Supply Voltage Fig. 12 Supply Current vs. Temperature 5 AIC7660 TYPICAL PERFORMANCE CHARACTERISTICS 70 (Continued) Oscillator Frequency Fosc(KHz) 60 50 Vin=5V Boost:VDD LV:Floating 40 30 20 10 0 -40 Boost:Floating LV:GND -20 0 20 40 Boost/LV Floating Boost:VDD LV:GND Fig. 13 Oscillation Frequency vs. Temperature Temperature ( C) o 60 80 100 BLOCK DIAGRAM 6 1 BOOST 7 OSC 6 LV Oscillator /2 VIN Voltage Level Converter 2 CAP+ 5 4 Voltage Regulator Substrate Logic Network VOUT CAP- 3 GND PIN DESCRIPTIONS PIN 1: BOOST - The frequency of oscillator will be 5 times if boost pin is connected to VIN. PIN 2: CAP+ - To be connected to the positive side of the flying capacitor. PIN 3: GND PIN 4: CAP- Ground - To be connected to the negative side of flying capacitor. PIN 8: VIN PIN 6: LV - If VIN is below 3.0V, LV should be tied to GND. For VIN greater than 3.0V, LV can be floating. - The frequency of oscillator can be lowered by the addition of an external capacitor to the OSC pin. Or the oscillator may be over-driven by an external clock. - Input supply. PIN 7: OSC PIN 5: VOUT - Negative output voltage, typically connected to a 10F capacitor. 6 AIC7660 APPLICATION EXAMPLES 8 VIN 3 C1 C2 3 2 5 Fig. 14 shows the idealized negative voltage converter. 4 VOUT=-VIN 7 Fig. 14 Idealized Negative Voltage Converter VIN (1.5V to 6V) 1 BOOST 2 CAP+ GND CAPVIN OSC LV 8 7 6 + CBYPASS 0.1F Required for VIN 3.0V VOUT=-VIN 10F C1 + 3 4 Fig. 15 shows a typical connection, which will provide a negative supply from an available positive supply without the need of any external diodes. The LV pin should be connect to ground for VIN3.0V, or may be "floated" for VIN>3.0V. VOUT 5 AIC7660 + 10F C2 VOUT=VIN/2 0.002% TMINTATMAX IL<100nA Fig. 15 Negative Voltage Converter 1 2 3 4 BOOS CAP+ GND CAPU1 VIN 8 OSC 7 LV 6 VOUT 5 AIC7660 Required for VIN 3.0V VIN (1.5V~6V) D1 + 1N4148 D2 + 1N4148 + C1 10F VOUT C2 10F CBYPASS 0.1F Fig. 16 shows a method of voltage doubling. VOUT=2VIN-2VD. To reduce the voltage drops across diodes, use Schottky diodes. Fig. 16 Voltage Doubling 7 AIC7660 APPLICATION EXAMPLES 1 BOOST 2 CAP+ 10F + C1 3 GND 4 CAPVOUT + C2 10F VIN 8 OSC 7 LV 6 VOUT 5 + (Continued) (3 to 12V) VIN CBYPASS 0.1F Required for VIN3.0V AIC7660 An ultra precision voltage divider is shown in Fig. 17. To achieve the 0.002% accuracy as indicated, the load current should be kept below 100nA. However, with a slight loss in accuracy, the load current can be increased. Fig. 17 Ultra Precision Voltage Divider 1 BOOST + VBAT C1 10F + 2 CAP+ 3 GND 4 CAP- VIN 8 OSC 7 LV 6 VOUT 5 + AIC7660 A common need in many systems is to obtain (+) and ( -) supplies from a single Required for battery or power supply system. Where VBAT3.0V current requirements are low, the circuit VOUT2= -VBAT/2 shown in Fig. 18 is a simple solution. CBYPASS 0.1F VOUT1= VBAT/2 + C2 10F Output Common Fig. 18 Battery Splitter 8 AIC7660 PHYSICAL DIMENSIONS (unit: mm) SOP-8 D H E e A A h X 45 SEE VIEW B A B A1 WITH PLATING BASE METAL SECTION A-A 0.25 C L VIEW B GAUGE PLANE SEATING PLANE S Y M B O L SOP-8 MILLIMETERS MIN. 1.35 0.10 0.33 0.19 4.80 3.80 1.27 BSC 5.80 0.25 0.40 0 6.20 0.50 1.27 8 MAX. 1.75 0.25 0.51 0.25 5.00 4.00 A A1 B C Note: 1. Refer to JEDEC MS-012AA. 2. Dimension "D" does not include mold flash, protrusions or gate burrs. Mold flash, protrusion or gate burrs shall not exceed 6 mil per side . 3. Dimension "E" does not include inter-lead flash or protrusions. 4. Controlling dimension is millimeter, converted inch dimensions are not necessarily exact. D E e H h L 9 AIC7660 DIP-8 D E GAUGE PLANE E1 eA eB A2 A b WITH PLATING A A 0.38 L BASE METAL SECTION A-A S Y M B O L D1 b2 e A1 DIP-8 MILLIMETERS MIN. MAX. 5.33 0.38 2.92 0.36 1.14 0.20 9.01 0.13 7.62 6.10 2.54 BSC 7.62 BSC 10.92 2.92 3.81 8.26 7.11 4.95 0.56 1.78 0.35 10.16 A A1 Note: 1. Refer to JEDEC MS-001BA 2. Dimension "D" does not include mold flash, protrusions or gate burrs. Mold flash, protrusion or gate burrs shall not exceed 10 mil per side . 3. Dimension "D1"and "E1" do not include inter-lead flash or protrusions. 4. Controlling dimension is millimeter, converted inch dimensions are not necessarily exact. A2 b b2 c D D1 E E1 e eA eB L c 10 AIC7660 Note: Information provided by AIC is believed to be accurate and reliable. However, we cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AIC product; nor for any infringement of patents or other rights of third parties that may result from its use. We reserve the right to change the circuitry and specifications without notice. Life Support Policy: AIC does not authorize any AIC product for use in life support devices and/or systems. Life support devices or systems are devices or systems which, (I) are intended for surgical implant into the body or (ii) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 11 |
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