CMOS Switched-Capacitor Voltage Converters ADM660/ADM8660 TYPICAL CIRCUIT CONFIGURATIONS FEATURES ADM660: Inverts or Doubles Input Supply Voltage +1.5V TO +7V ADM8660: Inverts Input Supply Voltage INPUT 100 mA Output Current Shutdown Function (ADM8660) V+ FC ADM660 2.2 F or 10 F Capacitors OSC CAP+ 0.3 V Drop at 30 mA Load + C1 +1.5 V to +7 V Supply LV 10 F GND INVERTED Low Power CMOS: 600 A Quiescent Current NEGATIVE CAP OUT Selectable Charge Pump Frequency (25 kHz/120 kHz) OUTPUT C2 10 F + Pin Compatible Upgrade for MAX660, MAX665, ICL7660 Available in 16-Lead TSSOP Package Voltage Inverter Configuration (ADM660) APPLICATIONS Handheld Instruments +1.5V TO +7V INPUT Portable Computers Remote Data Acquisition V+ FC ADM8660 Op Amp Power Supplies CAP+ + C1 LV GND INVERTED 10 F GENERAL DESCRIPTION NEGATIVE OUT CAP OUTPUT C2 The ADM660/ADM8660 is a charge-pump voltage converter SHUTDOWN 10 F SD + CONTROL that can be used to either invert the input supply voltage giving V = V or double it (ADM660 only) giving V = 2 V . OUT IN OUT IN Voltage Inverter Configuration with Shutdown (ADM8660) Input voltages ranging from +1.5 V to +7 V can be inverted into a negative 1.5 V to 7 V output supply. This inverting scheme is ideal for generating a negative rail in single power supply The ADM660 is a pin compatible upgrade for the MAX660, systems. Only two small external capacitors are needed for the MAX665, ICL7660, and LTC1046. charge pump. Output currents up to 50 mA with greater than The ADM660/ADM8660 is available in 8-lead DIP and 90% efficiency are achievable, while 100 mA achieves greater narrow-body SOIC. The ADM660 is also available in a 16-lead than 80% efficiency. TSSOP package. A Frequency Control (FC) input pin is used to select either 25 kHz or 120 kHz charge-pump operation. This is used to ADM660/ADM8660 Options optimize capacitor size and quiescent current. With 25 kHz Option ADM660 ADM8660 selected, a 10 F external capacitor is suitable, while with 120 kHz the capacitor may be reduced to 2.2 F. The oscillator frequency Inverting Mode Y Y on the ADM660 can also be controlled with an external capacitor Doubling Mode Y N connected to the OSC input or by driving this input with an External Oscillator Y N external clock. In applications where a higher supply voltage is Shutdown N Y desired it is possible to use the ADM660 to double the input Package Options voltage. With input voltages from 2.5 V to 7 V, output voltages R-8 Y Y from 5 V to 14 V are achievable with up to 100 mA output current. N-8 Y Y The ADM8660 features a low power shutdown (SD) pin instead RU-16 Y N of the external oscillator (OSC) pin. This can be used to disable the device and reduce the quiescent current to 300 nA. C REV. Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. may result from its use. No license is granted by implication or otherwise Tel: 781/329-4700 www.analog.com under any patent or patent rights of Analog Devices. Trademarks and Fax: 781/461-3113 2011 Analog Devices, Inc. All rights reserved. registered trademarks are the property of their respective companies.(V+ = +5 V, C1, C2 = 10 F,* T = T to T , unless A MIN MAX ADM660/ADM8660SPECIFICATIONS otherwise noted.) Parameter Min Typ Max Unit Test Conditions/Comments Input Voltage, V+ R = 1 kW L 3.5 7.0 V Inverting Mode, LV = Open 1.5 7.0 V Inverting Mode, LV = GND 2.5 7.0 V Doubling Mode, LV = OUT Supply Current No Load 0.6 1 mA FC = Open (ADM660), GND (ADM8660) 2.5 4.5 mA FC = V+, LV = Open Output Current 100 mA Output Resistance (ADM660) 9 15 W I = 100 mA L Output Resistance (ADM8660) 9 15 W I = 100 mA, T = 25C L A Output Resistance (ADM8660) 16.5 W I = 100 mA, T = 40C to +85C L A Charge-Pump Frequency 25 kHz FC = Open (ADM660), GND (ADM8660) 120 kHz FC = V+ OSC Input Current 5 mAFC = Open (ADM660), GND (ADM8660) 25 mAFC = V+ Power Efficiency (FC = Open) (ADM660) 90 94 % R = 1 kW Connected from V+ to OUT L Power Efficiency (FC = Open) (ADM8660) 90 94 % R = 1 kW Connected from V+ to OUT, L T = +25C A Power Efficiency (FC = Open) (ADM8660) 88.5 % R = 1 kW Connected from V+ to OUT, L T = 40C to +85C A Power Efficiency (FC = Open) (ADM660) 90 93 % R = 500 W Connected from OUT to GND L Power Efficiency (FC = Open) (ADM8660) 90 93 % R = 500 W Connected from OUT to GND, L T = +25C A Power Efficiency (FC = Open) (ADM8660) 88.5 % R = 500 W Connected from OUT to GND, L T = 40C to +85C A Power Efficiency (FC = Open) 81.5 % I = 100 mA to GND L Voltage Conversion Efficiency 99 99.96 % No Load Shutdown Supply Current, I 0.3 5 mA ADM8660, SHDN = V+ SHDN Shutdown Input Voltage, V 2.4 V SHDN High = Disabled SHDN 0.8 V SHDN Low = Enabled Shutdown Exit Time 500 msI = 100 mA L *C1 and C2 are low ESR (<0.2 W) electrolytic capacitors. High ESR degrade performance. Specifications subject to change without notice. 2 REV. C