LTC3862HFE

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The LTC3862HFE is a synchronous step-down DC/DC switching controller designed to provide cost-effective solutions for a wide range of industrial and consumer electronics applications. The controller can be used to efficiently regulate output current to a constant level. The LTC3862HFE provides accurate current-mode control, which provides high-precision current control that is unaffected by input or output transients. The controller features an internal low-side MOSFET driver with fast response time and allows for operating frequencies up to 900KHz. The internal oscillator is programmable for a wide range of frequencies.

The LTC3862HFE is manufactured from a monolithic die consisting of several analog and digital functions. The integrated features are the error amplifier, a reference, the oscillator and the gate drivers. The error amplifier is designed to minimize errors due to input or output transients, while the reference provides a stable output voltage. The oscillator is used to generate switching frequencies as well as active cycle-by-cycle current limiting. The gate drivers provide an efficient control of the external MOSFETs.

The LTC3862HFE is suitable for a variety of power management applications such as portable device chargers, white goods, AC/DC adapters and DC/DC converters. It is ideally suited for applications with a wide input voltage range or where high efficiency or high current density is desired. The controller features an integrated current-mode control loop, which provides stable performance over a wide input voltage range. In addition, the controller operates with a maximum duty cycle of 100%, which allows for high efficiency at light loads. It also includes an accurate on-chip voltage reference, which allows for precise voltage regulation.

The LTC3862HFE employs a variety of protection features including input undervoltage lockout (UVLO), adjustable hiccup-style current limiting and thermal shutdown. The UVLO is adjustable from the 0.51V to 1.02V and is set via the input voltage. The adjustable current limiting feature allows the user to select a current setting, which prevents the external MOSFETs from operating under overload conditions. The thermal shutdown provides protection against excessively high junction temperatures by limiting the die temperature.

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