Harris Semiconductor ICL7660CSA

of ICL7660CSA The ICL7660CSA is a charge pump voltage converter IC developed by Harris Semiconductor (now part of Intersil). It is listed under the integrated circuits category and is primarily used to generate a negative voltage from a positive voltage supply. The device is capable of providing a nominal output voltage that is negative with respect to the input. Functions 1. Voltage Conversion: Converts a positive input voltage to a negative output voltage (inverting converter). 2. Charge Pump: Uses capacitors to store and transfer energy, allowing for efficient voltage conversion. 3. Regulated Output: Can maintain a stable output voltage despite variations in load or input voltage. 4. Low Current Consumption: Designed for low power applications, making it suitable for battery-operated devices. Applications 1. Power Supply for Op-Amps and Logic Circuits: Provides the necessary negative voltage for operational amplifiers and digital logic circuits that require dual supply voltages. 2. Negative Voltage Generation: Useful in applications where negative bias is required, such as in analog signal processing. 3. OLED Displays: Supplies negative voltage needed for driving OLED displays. 4. Portable Devices: Ideal for use in battery-powered devices where size and efficiency are crucial. Alternative Parts 1. LM7660: A similar charge pump voltage inverter that provides similar functionality for negative voltage generation. 2. MAX660: Another charge pump IC from Maxim Integrated which also performs voltage inversion. 3. LT1054: Offers a broader range of voltage conversion options with slightly different specifications and features. Embedded Modules While specific modules featuring ICL7660CSA might not be commonly sold, it is often integrated into custom PCBs designed for specific applications. However, some evaluation boards or development kits may exist that showcase its capabilities and allow for experimentation with negative voltage generation. Related Q&A Q1: What is the typical output voltage range of the ICL7660CSA? A1: The typical output voltage of the ICL7660CSA, when supplied with a positive input voltage (e.g., +5V), can yield a negative output voltage of approximately -5V, depending on the load conditions. Q2: Can the ICL7660CSA be used with variable input voltages? A2: Yes, the ICL7660CSA can accept a range of positive input voltages, typically from 1.5V to 10V, and still produce a stable negative output within its specifications. Q3: What are the main advantages of using a charge pump like the ICL7660CSA versus a linear regulator for negative voltage supply? A3: Charge pumps like the ICL7660CSA are generally more efficient than linear regulators for generating negative voltages, especially in low current applications, because they do not dissipate as much power as heat and do not require a heatsink. Q4: How does the ICL7660CSA maintain regulation of the output voltage under varying load conditions? A4: The ICL7660CSA features internal circuitry that monitors the output voltage and modifies the operation of the charge pump to compensate for changes in load, thereby maintaining the output voltage within specified limits. Q5: Are there any additional components needed when using the ICL7660CSA in a circuit? A5: Yes, several external capacitors are required for proper operation, typically for the charge pumping process, and for input and output decoupling to stabilize the voltages and reduce noise.