The MAX660CSA+ from Analog Devices (Maxim) is a monolithic CMOS charge-pump voltage converter that inverts or doubles an input voltage from 1.5V to 5.5V at up to 100mA output current in an 8-pin SOIC package.<\/p>\n
| \u529f\u80fd<\/td>\n | Charge-Pump Voltage Inverter \/ Doubler<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||
| \u8f93\u5165\u7535\u538b<\/td>\n | 1.5V to 5.5V<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||
| Output Voltage<\/td>\n | -VIN (inverter) or 2x VIN (doubler)<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||
| \u8f93\u51fa\u7535\u6d41<\/td>\n | 100 mA (max)<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||
| Conversion Efficiency<\/td>\n | 96% (typ, no load)<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||
| Output Resistance<\/td>\n | 6.5 Ohm (typ @ 5V, +25C)<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||
| Oscillator Frequency<\/td>\n | 10 kHz (internal) or up to 45kHz (external)<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||
| Supply Current<\/td>\n | 200 uA (typ @ 5V)<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||
| \u5305\u88c5<\/td>\n | 8-SOIC (3.9mm width)<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||
| \u5de5\u4f5c\u6e29\u5ea6<\/td>\n | 0 to +70 C<\/td>\n<\/tr>\n<\/table>\n\u7279\u70b9<\/h2>\n\u5e94\u7528<\/h2>\nProduct Overview The MAX660CSA+ from Analog Devices (Maxim) is a monolithic CMOS charge-pump voltage converter that inverts or doubles an input voltage from 1.5V to 5.5V at up to 100mA output current in an 8-pin SOIC package. Key Specifications Function Charge-Pump Voltage Inverter \/ Doubler Input Voltage 1.5V to 5.5V Output Voltage -VIN (inverter) or […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[19,13],"tags":[],"chip_brand":[165],"class_list":["post-3790","post","type-post","status-publish","format-standard","hentry","category-analog-linear-ics","category-integrated-circuits-ics","chip_brand-adi"],"acf":{"brief_explanation":"Charge-pump voltage inverter\/doubler, 1.5-5.5V in, 100mA out, SOIC-8","date_code":"","package_case":"8-SOIC (4.9 x 3.9 x 1.75 mm, SA package)","in_stock":5455,"datasheet":"https:\/\/www.analog.com\/media\/en\/technical-documentation\/data-sheets\/MAX660.pdf","price":"$1.50 @ 1ku","product_introduction":"The MAX660CSA+ from Analog Devices (Maxim) is a monolithic CMOS charge-pump voltage converter that can invert a positive input voltage to its negative equivalent (e.g., +5V to -5V) or double the input voltage (e.g., +3V to +6V). The device requires only two external capacitors (typically 10uF to 150uF) for operation, making it one of the simplest voltage conversion solutions available. The MAX660 improves upon the classic ICL7660 with half the output resistance (6.5 Ohm typical vs. 12-15 Ohm for ICL7660 at 5V), delivering higher output current at lower voltage drop. The 100mA maximum output current and 96% no-load conversion efficiency make it suitable for moderate-power negative rail generation in op-amp circuits, RS-232 transceivers, and data acquisition systems. The internal oscillator operates at 10kHz, but the FC (frequency control) pin allows an external capacitor to increase the frequency up to 45kHz for lower output ripple, or an external clock can drive the OSC pin for precise frequency control. In inverter mode, the output voltage is approximately -VIN + (IOUT x ROUT), where ROUT is the output resistance. For example, with VIN=5V and IOUT=50mA, VOUT = -5V + (0.05A x 6.5Ohm) = -4.675V. In doubler mode, the output is approximately 2xVIN - (IOUT x ROUT). The MAX660CSA+ operates over the 0 to +70C temperature range and is available in an 8-pin SOIC package.","working_principle":"The MAX660CSA+ operates using a flying-capacitor charge-pump (also called switched-capacitor) technique. Key subsystems include: (1) Charge Pump - the core of the device is a network of CMOS switches that alternately charge and discharge an external 'flying' capacitor (C1); during phase 1, C1 is connected between VIN and GND and charges to VIN; during phase 2, C1 is reconnected with its positive terminal to GND and negative terminal to the output; this effectively 'pumps' charge from VIN to VOUT, creating a negative output voltage; (2) Output Filter - a second external capacitor (C2) smooths the output voltage ripple; the ripple amplitude is approximately IOUT \/ (fOSC x C2); larger C2 or higher oscillator frequency reduces ripple; (3) Oscillator - the internal RC oscillator runs at approximately 10kHz; the FC pin selects between 10kHz (FC=V+ or open) and 45kHz (FC=GND) operation; alternatively, an external clock (up to 150kHz) can be applied to the OSC pin; higher frequencies reduce output ripple and allow smaller capacitors but increase supply current; (4) Doubler Mode - in voltage doubler configuration, the flying capacitor is charged to VIN during phase 1, and during phase 2 it is stacked on top of VIN (series-connected), producing approximately 2 x VIN at the output; the output capacitor C2 filters the result; (5) Efficiency - the conversion efficiency is determined by the ratio of output resistance to load resistance; at no load, efficiency is 96% (only quiescent current loss); at full load, efficiency decreases because more power is dissipated in the output resistance.","pin_description":"
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