LM2640MTCX-ADJ

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Regulator

Characteristics: - Adjustable output voltage - High efficiency - Low dropout voltage - Small package size - Wide input voltage range

Package: SOT-23-6

Essence: The LM2640MTCX-ADJ is a voltage regulator IC that provides an adjustable output voltage with high efficiency and low dropout voltage. It is commonly used in various electronic devices to regulate the voltage levels and ensure stable power supply.

Packaging/Quantity: The LM2640MTCX-ADJ is available in a small SOT-23-6 package. It is typically sold in reels or tubes containing multiple units.

Specifications

• Input Voltage Range: 2.7V to 5.5V
• Output Voltage Range: 0.8V to VIN
• Maximum Output Current: 600mA
• Dropout Voltage: 200mV at 100mA
• Quiescent Current: 45µA
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The LM2640MTCX-ADJ has six pins arranged as follows:

____ VIN --| | EN --| | FB --| | GND --| | SW --| | |____|

1. VIN: Input voltage pin
2. EN: Enable pin for turning the regulator on/off
3. FB: Feedback pin for adjusting the output voltage
4. GND: Ground reference pin
5. SW: Switching node pin for connecting the external inductor

Functional Features

• Adjustable Output Voltage: The LM2640MTCX-ADJ allows users to set the desired output voltage within the specified range, providing flexibility in various applications.
• High Efficiency: The voltage regulator exhibits high efficiency, minimizing power losses and maximizing battery life in portable devices.
• Low Dropout Voltage: With a low dropout voltage, the LM2640MTCX-ADJ can maintain a stable output voltage even when the input voltage is close to the desired output voltage.
• Small Package Size: The SOT-23-6 package offers a compact form factor, making it suitable for space-constrained designs.
• Wide Input Voltage Range: The IC can operate with input voltages ranging from 2.7V to 5.5V, accommodating different power sources.

Advantages and Disadvantages

Advantages: - Adjustable output voltage allows customization for specific requirements. - High efficiency reduces power consumption. - Low dropout voltage ensures stable output even with varying input voltages. - Small package size enables integration into compact designs. - Wide input voltage range provides versatility in power source selection.

Disadvantages: - Limited maximum output current of 600mA may not be sufficient for high-power applications. - Requires an external inductor for operation, adding complexity to the circuit design.

Working Principles

The LM2640MTCX-ADJ operates as a step-down (buck) voltage regulator. It uses a pulse-width modulation (PWM) control scheme to regulate the output voltage. The feedback pin (FB) is connected to a resistive voltage divider that sets the desired output voltage. The internal control circuitry adjusts the duty cycle of the switching transistor (SW) to maintain the output voltage at the desired level.

When the enable pin (EN) is high, the regulator is enabled, and the output voltage is regulated according to the feedback voltage. When the enable pin is low, the regulator enters a low-power shutdown mode, reducing quiescent current consumption.

Detailed Application Field Plans

The LM2640MTCX-ADJ is widely used in various applications, including but not limited to: 1. Battery-powered devices: Portable electronics, smartphones, tablets, and wearable devices benefit from the LM2640MTCX-ADJ's high efficiency and low dropout voltage, extending battery life. 2. Industrial equipment: The voltage regulator can be employed in industrial control systems, sensors, and actuators, ensuring stable power supply in harsh environments. 3. Automotive electronics: The LM2640MTCX-ADJ finds application in automotive infotainment systems, lighting controls, and other onboard electronics, providing reliable voltage regulation.

Detailed and Complete Alternative Models

1. LM2678S-ADJ: Similar to LM2640MTCX-ADJ, this IC offers adjustable output voltage with high efficiency and low dropout voltage. It comes in a TO-263 package.
2. LM317T: A popular linear voltage regulator with adjustable output voltage. It has a higher dropout voltage compared to the LM2640MTCX-ADJ but does not require an external inductor. Available in