### TC962CPA Overview The **TC962CPA** is an advanced charge pump voltage converter manufactured by Microchip Technology. It is a pin-compatible, high-current upgrade to the industry-standard ICL7662 and SI7661 devices. --- ### Key Technical Specifications The following table summarizes the primary electrical characteristics of the TC962CPA: | Parameter | Specification | | :--- | :--- | | **Input Voltage Range** | 3.0V to 18V | | **Output Current** | Up to 80mA | | **Oscillator Frequency** | 12 kHz (typical) | | **Efficiency** | 99.9% (Voltage conversion) | | **Power Efficiency** | 96% (Typical) | | **Package Type** | 8-Pin PDIP (Plastic Dual In-line Package) | | **Operating Temperature** | 0°C to +70°C | --- ### Internal Electronic Functions The TC962CPA performs DC-to-DC conversion using only two external capacitors. It eliminates the need for inductors, which reduces EMI and saves board space. 1. **Voltage Inversion:** The device is most commonly used to convert a positive input voltage ($+V_{IN}$) to a negative output voltage ($-V_{OUT}$). 2. **Internal Oscillator:** It features an on-board oscillator. The frequency can be lowered by adding an external capacitor to the `OSC` pin or increased by overdriving it with an external clock. 3. **Voltage Doubling:** While primarily an inverter, the device can be configured in circuits to double the input voltage. 4. **Low Output Impedance:** At 80mA, it maintains a low output impedance (typically 28 $\Omega$), ensuring stable power delivery to the load. --- ### Pin Configuration The TC962CPA uses a standard 8-pin layout: * **Pin 1:** NC (No Connection) * **Pin 2:** $CAP+$ (Positive terminal of the charge pump capacitor) * **Pin 3:** GND (Ground) * **Pin 4:** $CAP-$ (Negative terminal of the charge pump capacitor) * **Pin 5:** $V_{OUT}$ (Negative voltage output) * **Pin 6:** $LV$ (Low Voltage pin; connect to GND for low voltage operation) * **Pin 7:** $OSC$ (Oscillator control input) * **Pin 8:** $V+$ (Positive power supply input) --- ### Typical Applications * **Negative Bias Generation:** Providing negative rails for Op-Amps and Comparators. * **RS-232 Power Supplies:** Generating $\pm$ voltage levels for communication interfaces. * **Handheld Instruments:** Efficient power management in battery-operated devices. * **Data Acquisition:** Creating bipolar supplies from a single 5V or 12V source.