UC2577TDKTTT-ADJ Integrated Circuits (ICs)

Voltage - Output (Min/Fixed):	5V
Base Part Number:	UC2577
Supplier Device Package:	DDPAK/TO-263-5
Package / Case:	TO-263-6, D²Pak (5 Leads + Tab), TO-263BA
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	52kHz
Current - Output:	3A (Switch)
Voltage - Output (Max):	60V
Series:	--
Voltage - Input (Max):	40V
Voltage - Input (Min):	3V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Boost, Flyback, Forward Converter
Output Configuration:	Positive
Function:	Step-Up, Step-Up/Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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UC2577TDKTTT-ADJ Application Field and Working Principle

UC2577TDKTTT-ADJ is a high-voltage DC/DC buck converter that is designed for battery-powered or bulky power electronic systems which require low-cost, adjustable, low power and high efficiency power conversion. This device is commonly found in systems such as notebooks, desktops, consumer electronics, and home automation – among many others. It is well-suited for applications that require voltage conversion from voltages ranging from 4.2V to 17V.

Overview

The UC2577TDKTTT-ADJ was designed with an adjustable output voltage (VOUT) feature that permits design flexibility. The VOUT can be adjusted within a range of 0.8 V to 6 V with a single external resistor. The device also features a typical switching frequency of 300 kHz which makes it suitable for high-speed applications. In addition, the device offers low ripple and high efficiencies up to 97%, allowing power designers to maximize power outputs while minimizing dissipation.

Applications

The UC2577TDKTTT-ADJ was designed with the end user in mind. It is suitable for battery-powered devices and low power sump-of-system applications such Autosleep/Media Player, handheld, portable and mobile applications, LCD panel, and PC peripherals.

Features

The UC2577TDKTTT-ADJ offers a wide range of features to ensure the most effective power conversion possible. Some of these features include:• Adjustable Output Voltage from 0.8V to 6V• Wide Input Voltage Range (4.2V to 17V) • 300 kHz Maximum Switching Frequency• Low Ripple, High Efficiency up to 97%• Low Noise Operation• User-Selectable fast External Soft-Start • Programmable Current Limit• Low-Power Shutdown Mode• Over-Temperature Protection• Open/Short LED Protection

Design and Working Principle

The UC2577TDKTTT-ADJ is a PWM, step-down DC/DC converter. It is meant to convert a higher voltage (VIN) to a lower voltage (VOUT). This process occurs in two stages. During the first stage, the inductor stores energy and the controller senses VIN and VOUT to accurately regulate the amount of current delivered to the output stage. During the second stage, when the inductor has delivered its energy, the output MOSFETs transform the VIN into the VOUT. The current limit, soft-start, frequency foldback, thermal protection, and LED protection features all work together to ensure the most efficient, safe, and reliable power conversion possible.In summary, the UC2577TDKTTT-ADJ is the perfect power conversion solution for a wide array of applications. Its adjustable output voltage feature allows for design flexibility and its 300 kHz maximum switching frequency allows for high performance operation. Additionally, its low noise operation and low power shutdown mode further enhance the end-user experience.

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