LTC660 Datasheet | Linear Technology

LTC660 100m A CMOS Voltage Converter Features s s s s s s DESCRIPTION The LTC®660 is a monolithic CMOS switched-capacitor voltage converter. It performs supply voltage conversion from positive to negative from an input range of 1.5V to 5.5V, resulting in plementary output voltages of - 1.5V to - 5.5V. It also performs a doubling at an input voltage range of 2.5V to 5.5V, resulting in a doubled output voltage of 5V to 11V. Only two external capacitors are needed for the charge pump and charge reservoir functions. The converter has an internal oscillator that can be overdriven by an external clock or slowed down when connected to a capacitor. The oscillator runs at a 10k Hz frequency when unloaded. A higher frequency outside the audio band can also be obtained if the BOOST pin is tied to V +. The LTC660 contains an internal oscillator, divide-by-two, voltage level shifter and four power MOSFETs. , LTC and LT are registered trademarks of Linear Technology Corporation. s s Simple Conversion of 5V to - 5V Supply Output Drive: 100m A ROUT: 6.5Ω (0.65V Loss at 100m A) BOOST Pin (Pin 1) for Higher Switching Frequency Inverting and Doubling Modes Minimum Open Circuit Voltage Conversion Efficiency: 99% Typical Power Conversion Efficiency with a 100m A Load: 88% Easy to Use U APPLICATIONS s s s s Conversion of 5V to ± 5V Supplies Inexpensive Negative Supplies Data Acquisition Systems High Current Upgrade to LTC1044 or LTC7660 TYPICAL APPLICATION Generating - 5V from 5V 1 2 BOOST CAP + Output Voltage vs Load Current for V + = 5V - 5.0 5V INPUT V+ OSC LV VOUT 8 7 GND CAP - 4 OUTPUT VOLTAGE (V) + C1 150µF - 4.8 - 5V OUTPUT - 4.6 C2...