LM2833ZMYX/NOPB

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Introduction

LM2833ZMYX/NOPB is a level 2 device in the Texas Instruments family of DC-DC Switching Regulators (PMIC - Voltage Regulators - DC DC Switching Regulators). The LM2833ZMYX/NOPB is a synchronous step-down converters with power MOSFETs. It provides a wide adjustable output range from 2.5V to 8V from 2 inductors. It also supports a power saving mode for always-on applications such as tablets.

Features

The LM2833ZMYX/NOPB provides a wide selection of features and functions:

• Wide input voltage range of 2.5 V to 8 V (VIN)
• Wide output voltage range of 1.6 V to 6 V (VOUT)
• Programmable soft-start time
• Internal compensation
• Programmable switching frequency, up to 2MHz
• Output overvoltage protection (OVP) and undervoltage lockout (UVLO)
• Reverse current protection
• Power save mode
• Thermal shutdown
• Integrated gate drivers and dual N-channel MOSFETs

Application Field

The LM2833ZMYX/NOPB is a versatile and efficient switch-mode regulator specifically designed for mobile and portable battery operated applications where board space and power conservation are of the utmost importance. Relying on its integrated low loss N-channel MOSFETs, it offers high current capability and a wide selection of output voltage options. This makes it well-suited for powering microprocessors, memory, digital signal processing (DSP) cores, display drivers, and other core logic ICs in mobile applications.

Working Principle

The LM2833ZMYX/NOPB is a synchronous step-down converter that operates with a PWM control scheme. In its simplest form, it consists of an input/output voltage sense configuration and a pulse-width modulator (PWM). It is constructed with integrated MOSFET drivers, two integrated N-channel MOSFETs, an oscillator, and a phase-shift controller. It provides a fixed frequency pulse-width modulated (PWM) output voltage for a wide range of input voltages.

The LM2833ZMYX/NOPB operates with a constant frequency, valley current mode PWM control scheme, ensuring that its switching frequency remains constant. The sense voltage scheme senses the output voltage and adjusts the pulse width modulation duty cycle as required in order to maintain the desired output voltage. The switching frequency is programmable up to 2MHz, allowing for efficient operation over a wide range of load currents.

The chip also incorporates low loss integrated MOSFETs, allowing for very high efficiency operation. The device also supports a power save mode, allowing it to remain in a low power state when not in use, further enhancing efficiency.

Conclusion

The LM2833ZMYX/NOPB is an efficient, programmable DC-DC synchronous step-down converter specifically designed for mobile and portable battery operated applications. Its integrated low loss N-channel MOSFETs allow for high current capability and a wide selection of output voltage options, making it well-suited for powering microprocessors, memory, DSP cores, display drivers, and other core logic ICs in mobile applications. The device also features a power save mode and programmable switching frequency, allowing for improved efficiency in battery operated applications.

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