LTC3861EUH-1#TRPBF

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The LTC3861EUH-1#TRPBF is a high performance synchronous buck switching regulator controller designed for a wide range of high current, low voltage regulated power supply applications. It features an internally fixed frequency, pulse-width modulated (PWM) current-mode control architecture. The device includes under-voltage lockout, output voltage feedback, current sense amplifier, and adjustable switching frequency.

The LTC3861EUH-1#TRPBF is particularly suitable for applications requiring high precision and excellent transient response featuring adjustable soft-start operation. It can support applications with input voltages up to 38V and is available in thermally-enhanced 8-lead MSOP and 16-lead SSOP packages.

Application Field

The LTC3861EUH-1#TRPBF is designed for a wide range of applications including high current, low voltage regulated power supplies, DC-DC converters, and battery charging systems. It can operate in an adjustable range from 2V to 5.5V, allowing for operation with very low input voltages. It is designed for applications requiring high accuracy and excellent transient response, featuring adjustable soft-start operation.

Working Principle

The LTC3861EUH-1#TRPBF is a monolithic synchronous buck switching regulator controller designed for a wide range of applications including high current, low voltage regulated power supplies. It is based on a current mode PWM (pulse-width modulation) architecture that provides fast transient response, wide bandwidth and low output ripple. At its core, the device includes an error amplifiers, an oscillator, a voltage sense amplifier, and a high-side/low-side driver with internal power MOSFETs.

When operating, a switching period is generated by an internal oscillator. This switching period generates a pulse-width modulated (PWM) signal driving the internal MOSFETs. An external resistor divider is used to program the output voltage. An error amplifier ensures that the output voltage is regulated to the target voltage. The current sense amplifier is used for current limiting. The device also features adjustable over voltage, under voltage and short-circuit protection.

The LTC3861EUH-1#TRPBF provides adjustable soft-start to reduce input inrush current and output overshoot. The device is operated in current mode synchronous buck configuration with power MOSFETs. The device has an adjustable switching frequency of up to 1.7 MHz and can provide up to 8.5A of output current. The device also features low output voltage ripple, low quiescent current and low EMI.

In summary, the LTC3861EUH-1#TRPBF is a high performance synchronous buck switching regulator controller designed for a wide range of high current, low voltage regulated power supply applications. It features an adjustable frequency, pulse-width modulated (PWM) current-mode control architecture and can support applications with input voltages up to 38V. It is designed for applications that require high accuracy and excellent transient response, featuring adjustable soft-start operation and efficient, low ripple current delivery.

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