LTC3828EUH

Voltage - Supply (Vcc/Vdd):	4.5 V ~ 28 V
Supplier Device Package:	32-QFN (5x5)
Package / Case:	32-WFQFN Exposed Pad
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable, Phase Control, Power Good, Tracking
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	99.4%
Frequency - Switching:	260kHz ~ 550kHz
Series:	PolyPhase®
Output Phases:	2
Number of Outputs:	2
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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LTC3828EUH Application Field and Working Principle

The LTC3828EUH is a monolithic synchronous buck regulator controller, providing a single output, easy-to-use power supply solution. This controller is designed to regulate a wide range of output voltages, from less than 0.6V up to 5.5V at adjustable current up to 20A. The device is provided with a low current start-up circuit, soft-start, under-voltage lockout, driver for fast 100kHz switching and programmable over-current protection. The LTC3828EUH is ideal for powering FPGAs, ASICs, microprocessors and other high power, low voltage devices.

Application Field

The LTC3828EUH offers several key features that make it ideal for use in a wide variety of applications. The synchronous buck regulator controller provides a highly efficient DC-DC switching solution with high accuracy, wide output and wide input adjustment. It is especially suitable for applications where high efficiency and small package size are required. The device is available in a low-profile, 10 lead MSOP package and is designed to withstand harsh environmental conditions.The LTC3828EUH has a wide operating temperature range, from -40°C to +85°C, making it suitable for a variety of applications in harsh environmental conditions. The device also offers under-voltage protection, soft-start and adjustable frequency, making it suitable for applications ranging from medical to automotive and industrial.

Working Principle

The LTC3828EUH employs a synchronous buck controller architecture to convert an input voltage to an adjustable output voltage. The output voltage is regulated by controlling the on/off time of the MOSFET driver, in a process called Pulse Width Modulation (PWM).The device features a resistor network which is used to set the output voltage and a voltage reference which is used to set the current limit. The output voltage is adjustable from 0.6V to 5.5V and the current limit can be set from 0mA to 20A. An external capacitor is connected to the output terminal to filter the PWM signal, resulting in a clean, regulated output voltage.When the output voltage drops below a preset threshold, the under-voltage lockout (UVLO) circuit is activated to prevent damage to the device. The device also features an adjustable soft-start circuit to prevent overshoot and reduce input current surge at start-up. Additionally, the device provides a comprehensive range of fault protection features, including over-voltage protection, under-voltage protection and over-current protection.

Conclusion

The LTC3828EUH is a highly efficient DC-DC switching controller that provides a single output, easy-to-use power supply solution. The synchronous buck controller provides adjustable output voltage and current limits, making it suitable for a wide variety of applications in harsh environmental conditions. The device features low power start-up, under-voltage lockout, programmable over-current protection and adjustable soft-start. The LTC3828EUH is thus well-suited for powering FPGAs, ASICs, microprocessors and other electronic devices.

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