LM2833ZSD/NOPB

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Integrated circuit LM2833ZSD/NOPB, typically categorized into the PMIC – Voltage Regulators – DC DC Switching Regulators group, is a highly specialized and dedicated semiconductor integrated circuit designed for the purpose of providing voltage regulation and efficient power conversion. While the product information specifies it as a "dual-channel step-down converter" the LM2833ZSD/NOPB is effectively a switching regulator with a current-mode controller used to produce a regulated output from an unregulated input. The integrated circuit offers outstanding features designed to facilitate power supply design and to simplify operation, including externally programmable system frequency, adjustable soft-start, variable operating current limit, programmable over-current limit, as well as internal temperature monitoring.

In designing with the LM2833ZSD/NOPB, the user is presented with the choice between an adjustable or preset output voltage. The adjustable output voltage option is achieved with the addition of one external resistor, while the preset output voltage is determined by the selection of the voltage setting resistor. The soft-start function can easily achieve smooth start-up of the regulator and is programmable via two external capacitors, while the output current limit is user-programmable through the setting of an external resistor.

The LM2833ZSD/NOPB is further equipped with an independent enable input for the shutdown of either channel and a comparator for monitoring the output voltage. The integrated circuit is designed to switch efficiently through the use of low-resistance MOSFET pass elements and the user is additionally provided with a programming capability for the peak current limit. The frequency of the switching system can be adjusted between 300 kHz and 1 MHz and the variable-frequency current-mode architecture of the device allows improved line and load transient response, as well as better protection against output voltage overshoot.

In terms of availability, the LM2833ZSD/NOPB is offered in an 8-lead SON thermally enhanced package that is rated for operation between the -40°C and 85°C temperature range and is available with a maximum power dissipation rating of 1380mW. The device can achieve up to 95% efficiency when used in conjunction with proper design and power sharing strategies. With adequate physical protection and heat sinking (as provided by the SON package and thermally enhanced technologies) incorporated into the design, the LM2833ZSD/NOPB is suitable for usage in a wide variety of applications.

In general, the LM2833ZSD/NOPB\'s integrated adjustable output voltage and programmable features, coupled with the excellent efficiency, high speed switching capabilities and mechanical ruggedness, make it a perfect choice for the design of demanding voltage regulation and conversion requirements such as, but not limited to, Portable Computing and Communications Devices, Portable Medical Instruments and Portable Sensor Systems. All of these devices require efficient power conversion as well as high reliability and the LM2833ZSD/NOPB is capable of meeting the task with ease.

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