LTC1044ACS8#PBF

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Converter/Charge Pump

Characteristics: - Converts a positive input voltage to the corresponding negative output voltage - Can be used as a voltage doubler or inverter - Low power consumption - High efficiency - Small package size - Wide operating voltage range

Package: 8-pin SOIC (Small Outline Integrated Circuit)

Essence: The LTC1044ACS8#PBF is a voltage converter IC that can generate a negative output voltage from a positive input voltage. It is commonly used in applications where a negative voltage is required, such as in audio amplifiers, LCD displays, and sensor circuits.

Packaging/Quantity: The LTC1044ACS8#PBF is typically sold in reels or tubes containing multiple units. The exact quantity may vary depending on the supplier.

Specifications

• Input Voltage Range: 1.5V to 10V
• Output Voltage Range: -1.5V to -10V
• Maximum Output Current: 20mA
• Operating Temperature Range: -40°C to 85°C
• Supply Current: 100µA (typical)
• Switching Frequency: 10kHz (typical)
• Package Type: SOIC-8

Pin Configuration

The LTC1044ACS8#PBF has the following pin configuration:

```

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| | --| V+ GND |-- Pin 1: Positive Supply Voltage (V+) --| VIN SW1 |-- Pin 2: Input Voltage (VIN) / Switch 1 Control --| GND SW2 |-- Pin 3: Ground (GND) / Switch 2 Control --| VOUT SW3 |-- Pin 4: Output Voltage (VOUT) / Switch 3 Control --| V- SW4 |-- Pin 5: Negative Supply Voltage (V-) / Switch 4 Control --| FB1 FB2 |-- Pin 6: Feedback Inputs 1 and 2 --| NC NC |-- Pin 7: No Connection --| NC NC |-- Pin 8: No Connection |___________| ```

Functional Features

• Voltage conversion from positive to negative
• Four internal switches controlled by external signals
• Low power consumption
• High efficiency
• Overload and short-circuit protection
• Internal frequency compensation

Advantages and Disadvantages

Advantages: - Compact size - Wide operating voltage range - Low power consumption - High efficiency - Overload and short-circuit protection

Disadvantages: - Limited output current capacity (20mA) - Requires external control signals for switch operation

Working Principles

The LTC1044ACS8#PBF utilizes a charge pump circuit to convert the input voltage into a negative output voltage. It consists of four internal switches that are controlled by external signals. These switches alternate between connecting the input voltage to the output and reversing the polarity of the output voltage.

When the input voltage is connected to the output, energy is stored in an external capacitor. During the reverse phase, this stored energy is transferred to the output, resulting in a negative voltage. The switching frequency determines the efficiency and output ripple of the converter.

Detailed Application Field Plans

The LTC1044ACS8#PBF can be used in various applications, including:

1. Audio Amplifiers: Provides a negative supply voltage required for audio amplification circuits.
2. LCD Displays: Generates the necessary negative bias voltage for driving LCD panels.
3. Sensor Circuits: Enables the use of negative supply voltages for sensor signal conditioning.

Detailed and Complete Alternative Models

1. MAX660: Voltage Converter/Charge Pump IC with similar specifications and pin configuration.
2. ICL7660: Monolithic CMOS Voltage Converter/Regulator with comparable features and performance.
3. TPS60403: Low-Power Charge Pump Voltage Inverter with adjustable output voltage.

These alternative models offer similar functionality and can be considered as substitutes for the LTC1044ACS8#PBF in various applications.

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