LTC7862HFE#TRPBF

Voltage - Supply (Vcc/Vdd):	4 V ~ 140 V
Supplier Device Package:	20-TSSOP-EP
Package / Case:	20-TSSOP (0.173", 4.40mm Width) Exposed Pad
Operating Temperature:	-40°C ~ 150°C (TJ)
Control Features:	Current Limit, Enable, Frequency Control, Ramp, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	100%
Frequency - Switching:	50kHz ~ 900kHz
Series:	*
Output Phases:	1
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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LTC7862HFE#TRPBF is a DC to DC switching controller that belongs to the Voltage Regulators family of Programmable Multi-integrated Circuit (PMIC) devices. Designed with an adaptive on-time control for high-efficiency synchronous DC/DC converters, the LTC7862HFE#TRPBF is suitable for automotive, industrial and consumer applications. It hence optimizes energy efficiency, reduces system power loss, and simplifies overall system design.The device monitors input voltage and the output voltage, and accurately regulates the output voltage to a user-programmable level, even during varying input voltage conditions. It features ultra-fast integrated MOSFET drivers for two outputs and switching frequency up to 2 MHz for increased power density.

Key Features of LTC7862HFE#TRPBF

• Wide 6.3 V to 42 V Input Voltage Range
• Two +/- 5 A Ultra-Fast MOSFET Integrated Drivers
• Adaptive Control for High Efficiency at Light Loads
• 2 MHz Switching Frequency Option
• Fast Transient Response
• Programmable Frequency Soft-Start and Overload Protection
• High Efficiency in Forced PWM Mode

Application Fields

The LTC7862HFE#TRPBF integrated switching controller is ideal for automotive, industrial, and consumer applications. The device’s small size and unique feature-set enables it to be used in applications such as high-efficiency DC to DC buck converters, multi-output converters, and DC to AC inversors. Its applications range from automotive non-isolated DC to DC converters, to smart home and IoT applications, medical power supplies, and power supplies for telecom equipment.

Working Principle

The LTC7862HFE#TRPBF switching controller is specifically designed to implement a synchronous buck regulator, with an adaptive on-time control. The control loop uses two parameters to ensure the output voltage stays at the desired value despite varying input voltages.First, the current-mode sensing kernel monitors the output voltage to ensure it stays at the desired voltage, and accordingly adjusts the ON-time to maintain the voltage. Secondly, voltage-mode control closely follows the output voltage during light loads, and switches to a fast, fixed ON-time pulse-cdwidth modulation (PWM) to maintain stability.Overall, the adaptive on-time control adjusts the minimum on-time carefully to achieve the desired switching performance. This ensures low output ripple, minimum power loss, and maximum battery life.

Block Diagram

The block diagram of the LTC7862HFE#TRPBF switching controller consists of an adaptive on-time control, an error amplifier, a current-mode controller, and an internal oscillator.At the core of the device is the adaptive on-time control which compares the output voltage to the internal reference voltage, and adjusts the maximum and minimum ON times accordingly. This control works with the current-mode controller, which monitors the inductor current, samples the voltage at the input, and outputs the correct switching signal for the two integrated MOSFET drivers.The error amplifier then adjusts the output voltage to the desired level, sending the error signal to the adaptive on-time control. Finally, the internal oscillator sets the switching frequency range (150 kHz to 2 MHz).

Conclusion

The LTC7862HFE#TRPBF switching controller is an optimized, space-saving device which includes an adaptive on-time control, current-mode sensing, and ultra-fast MOSFET drivers. Its wide input voltage range, and high switching frequency range, make it suitable for automotive, industrial and consumer applications such as power supplies and DC to AC inverters. The device is easy to use and configure, and delivers high performance and efficiency, even at light loads.

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