TPS61140DRCT

Product Overview

Category

The TPS61140DRCT belongs to the category of integrated circuits (ICs) and specifically falls under the category of boost converters.

Use

This IC is primarily used for driving white LEDs in backlighting applications, such as LCD displays in mobile phones, tablets, and other portable electronic devices.

Characteristics

• The TPS61140DRCT is a highly efficient boost converter that can drive up to 10 white LEDs.
• It operates with a wide input voltage range, typically from 2.7V to 18V.
• The IC provides a constant current output, ensuring uniform brightness across all connected LEDs.
• It offers adjustable LED current through an external resistor.
• The device incorporates overvoltage protection, thermal shutdown, and overcurrent protection features.
• It is designed to minimize electromagnetic interference (EMI) and radio frequency interference (RFI).

Package and Quantity

The TPS61140DRCT is available in a small outline package (SOT-23-6) and is supplied in tape and reel packaging. Each reel contains 3000 units.

Specifications

• Input Voltage Range: 2.7V to 18V
• Output Current Range: Up to 30mA per LED
• Efficiency: Up to 90%
• Operating Temperature Range: -40°C to +85°C
• Dimming Control: PWM or DC voltage control

Pin Configuration

The TPS61140DRCT has six pins arranged as follows:

____ EN | | VIN FB | | GND VOUT|____| LX

1. EN: Enable pin for turning the device on/off.
2. VIN: Input voltage pin.
3. FB: Feedback pin for adjusting the LED current.
4. GND: Ground pin.
5. VOUT: Output voltage pin.
6. LX: Inductor connection pin.

Functional Features

1. High Efficiency: The TPS61140DRCT offers high efficiency, ensuring minimal power loss during operation.
2. Constant Current Output: It provides a constant current output, resulting in consistent brightness across all LEDs.
3. Wide Input Voltage Range: The IC can operate with a wide range of input voltages, making it suitable for various applications.
4. Overvoltage and Overcurrent Protection: The device incorporates protection features to safeguard against voltage and current fluctuations.
5. Thermal Shutdown: It includes thermal shutdown functionality to prevent overheating and ensure safe operation.
6. Dimming Control: The TPS61140DRCT supports both pulse width modulation (PWM) and DC voltage control for dimming the LEDs.

Advantages and Disadvantages

Advantages

• High efficiency leads to reduced power consumption.
• Constant current output ensures uniform brightness.
• Wide input voltage range allows for versatile application.
• Protection features enhance reliability and durability.
• Dimming control options provide flexibility in lighting adjustment.

Disadvantages

• Limited to driving up to 10 white LEDs.
• Requires an external resistor for LED current adjustment.

Working Principles

The TPS61140DRCT operates as a boost converter, converting a lower input voltage to a higher output voltage required for driving white LEDs. It utilizes an inductor to store energy during the ON state and releases it to the output during the OFF state. This process creates a higher voltage at the output, enabling efficient LED driving.

The feedback pin (FB) is used to adjust the LED current by connecting an external resistor. By varying the resistance, the desired LED current can be set. The enable pin (EN) controls the on/off state of the device, allowing for power management.

Detailed Application Field Plans

The TPS61140DRCT is commonly used in various applications, including: 1. Mobile phones and smartphones 2. Tablets and e-readers 3. Portable gaming devices 4. GPS navigation systems 5. Portable media players 6. Digital cameras and camcorders 7. Automotive displays 8. Industrial control panels

Detailed Alternative Models

1. TPS61141DRCT: Similar to TPS61140DRCT but with the ability to drive up to 15 white LEDs.
2. TPS61142DRCT: Boost converter IC capable of driving up to 20 white LEDs.
3. TPS61143DRCT: Higher power variant that can drive up to 30 white LEDs.

These alternative models offer increased LED driving capabilities while maintaining similar characteristics and features as the TPS61140DRCT.

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