TC7660MJA

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Converter
• Characteristics: Low-power, voltage doubling/inverting, high efficiency
• Package: DIP (Dual In-line Package)
• Essence: Charge Pump Voltage Converter
• Packaging/Quantity: Tube packaging, 25 pieces per tube

Specifications

• Input Voltage Range: 1.5V to 10V
• Output Voltage Range: -1.5V to -10V
• Output Current: Up to 20mA
• Operating Temperature Range: -40°C to +85°C
• Supply Voltage: 1.5V to 10V
• Quiescent Current: 120µA (typical)

Detailed Pin Configuration

The TC7660MJA has a total of 8 pins:

1. GND: Ground pin
2. V+: Positive supply voltage input
3. OSC: Oscillator frequency control pin
4. C1-: Negative terminal of the flying capacitor C1
5. C1+: Positive terminal of the flying capacitor C1
6. C2-: Negative terminal of the flying capacitor C2
7. C2+: Positive terminal of the flying capacitor C2
8. VOUT: Output voltage pin

Functional Features

• Voltage doubling: Converts input voltage to double the magnitude at the output
• Voltage inverting: Generates a negative voltage at the output
• High efficiency: Minimizes power loss during conversion process
• Low-power consumption: Operates with low quiescent current
• Oscillator frequency control: Allows adjustment of the switching frequency

Advantages and Disadvantages

Advantages: - Compact size and DIP package make it suitable for various applications - Wide input voltage range allows flexibility in power supply selection - High efficiency results in minimal power loss during conversion - Low-power consumption extends battery life in portable devices

Disadvantages: - Limited output current capacity may not be suitable for high-power applications - Requires external capacitors for proper operation - Oscillator frequency control may require additional circuitry for precise frequency adjustment

Working Principles

The TC7660MJA is a charge pump voltage converter that utilizes switched capacitor techniques to convert the input voltage to a higher or inverted output voltage. It consists of two flying capacitors (C1 and C2) and an internal oscillator.

During operation, the internal oscillator alternately connects the flying capacitors to the input voltage source and then to the output load. This switching action transfers charge from the input to the output, effectively doubling the voltage or generating an inverted voltage at the output pin.

Detailed Application Field Plans

The TC7660MJA can be used in various applications, including:

1. Battery-powered devices: Provides negative voltage supply for LCD displays, audio amplifiers, and other components.
2. Portable instruments: Generates a negative voltage for operational amplifiers, sensors, and other analog circuits.
3. Industrial automation: Converts positive voltage to negative for motor control, signal conditioning, and control systems.
4. Telecommunications: Inverts voltage for line drivers, telephony circuits, and network equipment.
5. Automotive electronics: Supplies negative voltage for automotive sensors, lighting systems, and audio amplifiers.

Detailed and Complete Alternative Models

1. ICL7660CPA: Similar functionality with different package (DIP)
2. MAX1044: Higher output current capability (up to 50mA)
3. LT1054: Adjustable output voltage range and higher output current (up to 100mA)

These alternative models offer similar voltage conversion capabilities with some variations in package, output current, and additional features.

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