LTC3851AEGN#PBF

Frequency - Switching:	235kHz ~ 750kHz
Base Part Number:	LTC3851
Supplier Device Package:	16-SSOP
Package / Case:	16-SSOP (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Current Limit, Enable, Frequency Control, Soft Start, Tracking
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	99%
Series:	--
Voltage - Supply (Vcc/Vdd):	4 V ~ 38 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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PMIC - Voltage Regulators - DC DC Switching Controllers

LTC3851AEGN#PBF is a wide-input, high-power-density, single-output synchronous step-down switching regulator controller from Linear Technology Corporation. This device is specifically designed to drive N-channel MOSFETs to provide up to 10A continuous load current over an input voltage range of 8V to 80V. It has an internal current-mode control architecture that regulates output voltage with a selectable level of switching frequency (200kHz to 2.6MHz). The programmable soft-start also helps to reduce inrush current at startup.

Application Field

LTC3851AEGN#PBF is optimal for high power applications such as distributed power conversion in server systems and microprocessors. It is also suitable for automotive applications such as automotive infotainment systems and driver assistance systems due to its wide input voltage range. In these systems, it can provide efficient step-down conversion from higher voltages in the battery (up to 48V) to lower voltages for load regulation.

Working Principle

The LTC3851AEGN#PBF has a constant frequency current-mode architecture. It uses an internal reference voltage and a comparator block to monitor the switch current. The output power is converted to a voltage signal and then compared with a reference voltage. The resultant difference is amplified by an internal error amplifier, and this error amplifier output is used to control the switching action of the N-channel MOSFET switch device.The maximum switch current is regulated by setting the sensed voltage level. This sensed voltage level is compared to the internal reference voltage, and the resulting difference is used to control the current sense threshold of the device. In addition, a proprietary slope compensation technique is used to improve the loop stability. It provides a steady-state gain and phase shift from the voltage error amplifier to the gate drive of the power MOSFET. This ensures that the output voltage is regulated independent of gate drive transient delays and is not affected by the power MOSFET\'s gate capacitance.Lastly, protection features like an over-temperature shut-down, over-voltage protection and under-voltage monitoring are included to prevent any damage due to excessive voltage levels.

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