LYT4225E

Series:	LYTSwitch™-4
Packaging:	Tube
Part Status:	Obsolete
Output Isolation:	Isolated
Internal Switch(s):	Yes
Voltage - Breakdown:	725V
Topology:	Flyback, Step-Down (Buck), Step-Up (Boost)
Voltage - Supply (Vcc/Vdd):	--
Duty Cycle:	99.9%
Frequency - Switching:	140kHz
Power (Watts):	25W
Fault Protection:	--
Control Features:	--
Operating Temperature:	-40°C ~ 150°C (TJ)
Package / Case:	7-SSIP, 6 Leads, Exposed Pad, Formed Leads
Supplier Device Package:	eSIP-7C
Mounting Type:	Through Hole

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PMIC – AC DC Converters, Offline Switchers

The LYT4225E is a step-down power management integrated circuit (PMIC) used in AC-DC converters and offline switchers. Capable of delivering up to 2.6 amps of continuous current, the LYT4225E is an ideal choice for space-constrained applications, including hand-held devices, automotive and consumer applications.The LYT4225E offers high efficiency, with high-speed switching, a wide input voltage range, and a low pin count that requires fewer additional components than conventional DC/DC converters. It is designed to reduce total application size and bill of materials (BOM) costs, while simplifying system design by providing excellent thermal performance and eliminating complicated power-on sequencing.The LYT4225E accepts a wide 4.5V to 28V input voltage range, and provides up to 2.6A of continuous current over a wide output voltage range of 0.9V to 5V with low output voltage ripple, accommodating a wide range of applications such as microcontrollers, digital logic and memories. The device includes an under-voltage and over-voltage lock-out (UV/OV) function, which provides better system stability and prevents any possible malfunction occurring at extreme over-voltage or under-voltage conditions. It also features a short-circuit, over-temperature, overload, and current limit protection, allowing a safe and reliable operation of the system.When used in a buck converter, the LYT4225E supports both continuous and discontinuous conduction mode (CCM/DCM) operation. As the load decreases, the device automatically transitions from CCM to DCM mode and thus maintains a high efficiency (greater than 95% across the entire load range) without compromising output performance. Additionally, at light load it enters Sleep Mode for improved efficiency.Integrated soft-start and fast transient resposne features ensure a smooth startup and minimizes the output voltage ripple at heavy load,while the two divider resistors and two capacitors used to program the switching frequency make the overall design much easier and quicker.Overall, the LYT4225E is an efficient, high-performance and reliable power management solution for AC/DC converters and offline switchers various applications. The low power consumption, low-cost design, and integrated protection features make it the ideal choice for space-constrained applications.

Application Field

The LYT4225E is suitable for a wide range of AC/DC converters and offline switchers applications such as LED drivers, audio amplifiers, power adapters, medical/industrial equipment, automotive charging systems, battery operated systems, and other consumer and portable electronics. It can also be used in space-constrained applications such as hand-held devices.

Working Principle

The LYT4225E is a monolithic buck converter circuit implemented using pulse width modulation (PWM). In this circuit, both the switching FETs and control ICs are integrated on a single chip, with the FETs sharing a common source. The device uses a fixed-frequency, current-mode control architecture, with synchronous rectification for improved efficiency.In operation, the high-side and low-side FETs are first turned on and off alternately at a fixed frequency of conversion. The outermost FET handles switch off and on transitions, while the innermost FET is controlled by the control IC to provide accurate current control and protection. A pulse-width-modulated (PWM) signal determines the duty cycle, and thus the output voltage. When the output voltage is below the desired level, a higher duty cycle is applied, and when it rises above the desired level, the duty cycle is lowered. This enables the circuit to maintain a steady-state output voltage over a wide range of load conditions. To guarantee optimal operation and reliability, the device also integrates several protection circuits, such as over-temperature protection (OTP), overload protection (LP), short-circuit protection (SCP), and UV/OV protection. In summary, the LYT4225E is a high efficiency, low cost and low pin count power management solution with special features that enable highly reliable and safe operation in AC/DC converters and offline switchers applications.

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