TPS61122PWR

Product Overview

Category

The TPS61122PWR belongs to the category of integrated circuits (ICs) and specifically falls under the power management ICs.

Use

This IC is primarily used for driving white LEDs in backlighting applications, such as LCD displays in various electronic devices.

Characteristics

• The TPS61122PWR 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.
• This IC offers adjustable output current and supports both series and parallel LED configurations.
• It provides excellent dimming control options, including analog and PWM dimming.
• The device incorporates overvoltage protection, thermal shutdown, and open/short LED detection features.

Package and Quantity

The TPS61122PWR is available in a small-sized surface-mount package known as PowerPAD™ MSOP-8. It is supplied in tape and reel packaging, with a quantity of 2500 units per reel.

Specifications

• Input Voltage Range: 2.7V to 18V
• Output Voltage Range: Up to 40V
• Maximum Output Current: 30mA
• Efficiency: Up to 90%
• Dimming Control: Analog and PWM
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The TPS61122PWR has eight pins arranged as follows:

1. EN (Enable): Enable pin for turning the device on/off.
2. VIN (Input Voltage): Connects to the power supply voltage.
3. GND (Ground): Ground reference for the IC.
4. FB (Feedback): Connects to an external resistor divider network for setting the output voltage.
5. DIM (Dimming Control): Accepts either an analog voltage or a PWM signal for dimming control.
6. VOUT (Output Voltage): Connects to the anode of the LED string.
7. SW (Switch Node): Connects to the inductor and diode for boost conversion.
8. PGND (Power Ground): Ground reference for the power stage.

Functional Features

• High efficiency boost converter for driving white LEDs.
• Wide input voltage range allows compatibility with various power sources.
• Adjustable output current enables flexibility in LED configurations.
• Multiple dimming control options provide precise brightness control.
• Integrated protection features ensure safe operation and longevity.

Advantages

• Efficient power management for white LED backlighting applications.
• Wide input voltage range accommodates different power supply scenarios.
• Flexible dimming control options for optimal brightness adjustment.
• Compact package size and tape and reel packaging facilitate easy integration into manufacturing processes.

Disadvantages

• Limited maximum output current may not be suitable for high-power LED applications.
• Lack of integrated fault detection for individual LED failures.

Working Principles

The TPS61122PWR operates as a boost converter, converting a lower input voltage to a higher output voltage required for driving white LEDs. It utilizes a switching regulator topology to efficiently step up the voltage while regulating the output current. The device incorporates a feedback mechanism to maintain a constant output voltage and supports various dimming control methods for brightness adjustment.

Detailed Application Field Plans

The TPS61122PWR finds extensive application in backlighting systems for LCD displays, including smartphones, tablets, laptops, televisions, and automotive infotainment systems. It is also suitable for other portable electronic devices that require efficient white LED driving.

Detailed and Complete Alternative Models

1. TPS61123PWR: Similar to TPS61122PWR but supports higher output currents.
2. TPS61125PWR: Offers additional fault detection features for individual LED failures.
3. TPS61126PWR: Provides integrated I2C interface for advanced control and monitoring capabilities.

These alternative models offer enhanced features and expanded capabilities, catering to specific requirements in different applications.

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