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| AIC1660 Switched-Capacitor Voltage Converter n FEATURES l n DESCRIPTION at The AIC1660 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 AIC1660 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 (V OUT = 2V IN ), divided (VOUT = VIN /2 ), or multiplied (V OUT = nV IN ), as shown in application examples. The chip contains a series DC power supply 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 (V IN 3V) operation, or be left floating for input voltage larger than 3V to improve power dissipation. Required for VIN 3V VOUT=-VIN + 10F C2 Lowest Output Impedance (Typical 35 VIN=5V). Improved Direct Replacement for 7660. 1.5V to 6V Operation. No External Diode Required. Simple Conversion of +5V to -5V. l l l l l l l l Low Quiescent Current (Typical 36A at VIN=5V). High Power Efficiency (Typical 98%) Boost Pin for Higher Switching Frequency. Improved SCR Latchup Protection. n APPLICATIONS l l l l l l RS-232 Power Supplies. Handheld Instruments. Data Acquisition Systems. Supply Splitter, VOUT= VIN /2. Operational Amplifier Supplies. Panel Meter. n TYPICAL APPLICATION CIRCUIT VIN (1.5V to 6V) 1 2 10F C1 + 3 4 AIC1660 8 7 6 5 The AIC1660 provides performance superior to previous designs by combining low output 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. Negative Voltage Converter Analog Integrations Corporation DS-1660T-P4 Oct. 4, 01 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw 1 AIC1660 n ORDERING INFORMATION AIC1660 CX PACKAGE TYPE N: PLASTIC DIP S: SMALL OUTLINE ORDER NUMBER AIC1660CN (PLASTIC DIP) AIC1660CS (PLASTIC SO) PIN CONFIGURATION TOP VIEW BOOST 1 8 VIN 7 OSC 6 LV 5 VOUT CAP+ 2 GND 3 CAP- 4 n ABSOLUTE MAXIMUM RATINGS Supply Voltage ................ ... ... ... ... ... ............... ... ... ... ... ... ... ... ....................................................... 6.0V Input Voltage on Pin 1, 6 and 7 ...... ... ... ... ... ............................. ... ... ... ... ... ... ............. -0.3V ~VIN + 0.3V Operating Temperature Range ........... ... ... ... ................... ... ... ... ... ... .... ... .......... ... ........... -40C~+85C Storage Temperature Range............. ... ... ... ...................... ... ... ... ... ... ... ... ........................ -65C~150C n TEST CIRCUIT 1 2 10F + C1 3 4 BOOST CAP+ VIN 8 OSC 7 COSC 6 IS VIN IL External Oscillator RL AIC1660 LV GND CAP- VOUT 5 C2 10F + VOUT 2 AIC1660 n ELECTRICAL CHARACTERISTICS (VIN=5.0V, TA=25C, OSC=free running, unless otherwise specified.) PARAMETER Supply Current Minimum Supply Voltage Maximum Supply Voltage Output Resistance TEST CONDITIONS RL = RL = RL = IL =20mA, FOSC =10KHz Oscillator Frequency COSC =0 Pin 1 Floating or GND Pin 1=VIN Power Efficiency Voltage Conversion Efficiency RL= 5K, FOSC =10KHz RL = PEFF VOUTEFF 96 98 FOSC 10 50 98 99.9 % % KHz SYMBOL IS VINL VINH ROUT 35 1.5 6 70 MIN TYP 36 MAX 70 UNIT A V V n TYPICAL PERFORMANCE CHARACTERISTICS (TA=25C) 100 50 Supply Current (A) 40 30 Power Efficiency (%) 1 2 3 4 5 6 90 80 20 70 10 60 0 50 0 10 20 30 40 50 60 70 80 Supply Voltage (V) Fig. 1 Supply Current vs. Supply Voltage Load Current (mA) Fig. 2 Power Efficiency vs. Load Current 3 AIC1660 n TYPICAL PERFORMANCE CHARACTERISTICS (Continued) -5 2 Output Voltage (V) Output Voltage (V) 1 -4 0 -3 -1 -2 -2 -10 0 10 20 30 40 50 60 70 80 0 2 4 6 8 10 12 14 16 Load Current (mA) Fig. 3 Output Voltage vs. Load Current Load Current (mA) Fig. 4 Power Efficiency vs. Load Current (VIN=2V) 60 Oscillation Frequency, FOSC (KHz) 35 30 Oscillation Frequency, FOSC (KHz) PIN 1=VIN 25 20 15 10 50 40 BOOST MODE 30 20 PIN 1=OPEN 5 0 10 100 1000 10 51 2 3 4 5 6 Supply Voltage, VIN (V) Fig. 5 Oscillator Frequency vs. Supply Voltage External Capacitor (Pin 7 to GND), COSC (pF) 10000 Fig. 6 Oscillator Frequency vs Value of C OSC 450 Output Resistance ROUT () 400 C1=C2=100F C1=C2=10F C1=C2=1F 300 200 100 0 0.1 1 10 100 Oscillation Frequency, FOSC (KHz) Fig. 7 Output Resistance vs. Oscillation Frequency 4 AIC1660 n BLOCK DIAGRAM VIN BOOST OSC Voltage Level Converter Oscillator O 2 CAP+ LV VOUT CAPVoltage Regulator Substrate Logic Network GND n 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 6: LV - If VIN is below 3V, LV should be tied to GND. For VIN larger than 3V, 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 8: VIN PIN 5: VOUT - Negative output voltage, typically connected to a 10F capacitor. 5 AIC1660 n APPLICATION EXAMPLES VIN (1.5V to 6V) 1 2 10F C1 + 3 4 AIC1660 8 7 6 5 + VOUT =-VIN 10F C2 Required for VIN3V Fig. 8 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 VIN3V, or may be "floated" for VIN >3V Fig. 8 Negative Voltage Converter VIN (1.5V to 6V) 1N4148 IOUT R1 220 C1 10F + 1 2 3 4 AIC1660 6 5 R2 470K 8 7 VOUT=2VIN + (3V to 12V) C2 10F Fig. 9 shows a method of voltage doubling. Voltage doubling is achieved by simply rearranging the connection of the two external capacitors. An external 470K resistor is required to ensure the oscillator will start. Fig. 9 Voltage Doubling (3 to 12V) VI N 1 2 10F + C1 AIC1660 3 4 VOUT =VIN/2 0.002% T MINT AT MAX IL <100nA 6 5 Required for VI N3V 8 7 An ultra precision voltage divider is shown in Fig. 10. 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. + C2 10 F Fig. 10 Ultra Precision Voltage Divider 6 AIC1660 n APPLICATION EXAMPLES (Continued) 1 VBAT (6V) + + C1 10F 3 4 AIC1660 + Output Common 6 5 C2 10 F 2 8 7 VOUT= VBAT/2 (3.0V) A common need in many systems is to obtain (+) and ( -) supplies from a single battery or power supply system. Where current requirements are Required for VBAT3V low, the circuit shown in Fig. 11 is a simple VOUT= -VBAT/2(-3V) solution. Fig. 11 Battery Splitter n PHYSICAL DIMENSIONS l 8 LEAD PLASTIC SO (unit: mm) D SYMBOL A A1 H E MIN 1.35 0.10 0.33 0.19 4.80 3.80 MAX 1.75 0.25 0.51 0.25 5.00 4.00 B C D e A C A1 E e H L L 1.27(TYP) 5.80 0.40 6.20 1.27 B 7 AIC1660 l 8 LEAD PLASTIC DIP (unit: mm) D SYMBOL A1 E1 MIN 0.381 2.92 0.35 0.20 9.01 7.62 6.09 MAX -- 4.96 0.56 0.36 10.16 8.26 7.12 A2 b C E D E E1 C A2 A1 L e eB L -- 2.54 (TYP) 10.92 3.81 eB b e 2.92 8 |
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