LTC7821IUH#TRPBF

Frequency - Switching:	200kHz ~ 1.5MHz
Base Part Number:	LTC7821
Supplier Device Package:	32-QFN (5x5)
Package / Case:	32-WFQFN Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	40%
Series:	--
Voltage - Supply (Vcc/Vdd):	10 V ~ 72 V
Output Phases:	2
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LTC7821IUH#TRPBF Application Field and Working Principle

The LTC7821IUH#TRPBF is a high-performance single-channel synchronous Pulse Width Modulation (PWM) step-down DC/DC controller. This device provides excellent regulation and transient response for a variety of applications, and is designed for automotive and harsh environment applications. The device measures the voltage, current and temperature of the output, then responds with a fast transit time with excellent line-side regulation, thus allowing for a compact design with full flexibility.

General Features and Applications

The LTC7821IUH#TRPBF PWM controller is designed for simple and efficient auto-dc-dc applications such as automotive and industrial monitors, battery chargers, and DC/DC converters. The device feature a wide input range from 6V to 16V and a nominal output voltage range as low as 0.8V to 12 V. With an ambient temperature up to 105 °C, this controller can handle both automotive and industrial applications without a heat sink. It also includes an adjustable feedback voltage range, a programmable soft start and burst mode, over-temperature protection, and under-voltage lockout (UVLO).

Design Overview

The LTC7821IUH#TRPBF DC/DC converter is a high-performance switching regulator designed for automotive and industrial applications that require precise voltage regulation. It utilizes a buck-based, synchronous PWM control architecture to generate a regulated and precise output voltage. This architecture uses an internal reference voltage and an internal error amplifier to compare the voltage feedback signal with the internal reference voltage. When the error amplifier determines that the two voltages differ, it adjusts the PWM duty cycle to maintain a regulated output voltage. In order to optimize the transient response, the error amplifier also has an adjustable voltage gain, as well as a programmable soft start and burst mode. The LTC7821IUH#TRPBF also features a wide range of features, such as over-temperature protection, undervoltage lockout, adjustable current limit, and initial current. Additionally, the device can be synchronized to an external clock for noise reduction and low EMI operation. It also includes an integrated linear regulator for low-power, low-temperature, low-noise operation.

Safety Features

The LTC7821IUH#TRPBF also comes with safety features, such as an adjustable over-voltage protection, over-temperature protection, and over-current protection. The over-voltage protection is adjustable to provide a maximum output voltage of 12V, while the over-temperature protection limits the output power and prevents thermal damage. The adjustable current limit feature allows the user to set the maximum output current allowed. Lastly, the over-current protection feature prevents the controller from exceeding a predetermined level of current.

Conclusion

The LTC7821IUH#TRPBF is a highly efficient, low-cost DC/DC converter designed for automotive and industrial applications. Its integrated error amplifier and adjustable feedback gain give it excellent line-side regulation and transient response, while its adjustable voltage and current limit capabilities provide additional safety and security. With its wide input and output voltage range, temperature range, and programmable soft start and burst mode, this device is well-suited for a variety of applications.

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