SS6660CNTB

SS6660 Switched-Capacitor Voltage Converter

FEATURES Low output impedance (typ. 35Ω at VIN=5V) Improved direct replacement for 7660 Operation from 1.5V to 6V DESCRIPTION The SS6660 is a monolithic CMOS switchedcapacitor voltage converter. Designed to be an improved direct replacement for the popular 7660 and LTC1044, the main function of the SS6660 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 11.5V to -6V. The input voltage can also be doubled (V OUT = 2V IN ), divided (V OUT = V IN /2), or multiplied (V OUT = ± nV IN ) as shown in the application examples. The chip contains a series DC power supply regulator, oscillator, control circuitry and four output power MOSFET switches. The frequency of the 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. No external diode required Simple conversion from +5V to -5V Low quiescent current (typ. 36µA at VIN=5V) High power efficiency (typ. 98%) Boost pin for higher switching frequency Improved SCR latchup protection APPLICATIONS RS-232 Power Supplies Handheld Instruments Data Acquisition Systems Supply Splitter VOUT = ±VIN/2 Operational Amplifier Supplies Panel Meter TYPICAL APPLICATION CIRCUIT



This 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 voltages VIN (1.5V to 6V) 


  




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larger than 3V to improve power dissipation. The SS6660 provides performance superior to previous designs by combining low output impedance, low quiescent current with high efficiency and by eliminating losses from diode voltage drops. The only external components required are two low-cost electrolytic capacitors. SS6660 Negative voltage converter Rev.2.02 1/29/2004 www.SiliconStandard.com 1 of 8

SS6660 PIN CONFIGURATION     1 2 3  8 
 7  6     ORDERING INFORMATION SS6660CXXX Packing type TR: Tape and reel TB: Tube Package type: N: Plastic DIP S: Small outline Example: SS6660CSTR in SO-8 package shipped on tape and reel. Please note that CN is only available in tubes.
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SS6660 ELECTRICAL CHARACTERISTICS (VIN = 5.0V, TA = 25°C, OSC = OPEN, unless otherwise specified.)
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SS6660 TYPICAL PERFORMANCE CHARACTERISTICS (cont.)
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