LTC3884ERHE-1#TRPBF

Frequency - Switching:	200kHz ~ 1MHz
Base Part Number:	LTC3884
Supplier Device Package:	48-GQFN (6x5)
Package / Case:	48-WFQFN Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Enable, Frequency Control, Phase Control, Power Good
Serial Interfaces:	I²C, PMBus
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	--
Series:	PolyPhase®
Voltage - Supply (Vcc/Vdd):	4.5 V ~ 38 V
Output Phases:	2
Number of Outputs:	2
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LTC3884ERHE-1#TRPBF Application Field and Working Principle

Linear Technology Corporation\'s LTC3884ERHE-1#TRPBF is a high-performance, current-mode, dual PWM synchronous step-down switching regulator controller. It is designed for low input voltage, high-current applications, such as automotive, industrial, and communication. This product offers adjustable operating frequency, internal fixed frequency oscillator, soft start and output voltage margining for easy system level optimization.

Overview of LTC3884ERHE-1#TRPBF

The LTC3884ERHE-1#TRPBF works with a low input voltage, enabling it to produce an output voltage of up to 25V. It offers two independent pulse width modulation (PWM) control channels, each operating at 180° out of phase with the other. This allows the LTC3884ERHE-1#TRPBF to be used in multiple dc-dc topologies, ranging from buck to dual-phase interleaving configurations. The device has a 2-phase output current rating of up to 80A and a single-phase output current rating of up to 140A. It contains a dedicated soft-start circuit, which reduces the large input current surge common to multiple-phase converters. The LTC3884ERHE-1#TRPBF also provides on-cycle current regulation over a wide range of output currents.

Working Principle of LTC3884ERHE-1#TRPBF

The LTC3884ERHE-1#TRPBF operates by using a voltage-mode current-mode control technique. This technique works by using two voltage-level signals to determine the switching of both output channels. Firstly, a voltage-level reference signal is used to determine the on-time period of each respective output. This reference voltage is set by the external resistor divider network connected to the VREF pins. Secondly, a current-sense signal is used to calculate the off-time period of each output. This current-sense signal is provided by the external sense resistor connected to the ISNS pins. The internal control logic continuously monitors both the voltage-level and current-sense signals and then modulates the pulse width of each associated output to control the across it. This modulation allows for precise control of the output voltage and current waveform, enabling the LTC3884ERHE-1#TRPBF to achieve high output power and efficiency ratings even at low input voltages. The LTC3884ERHE-1#TRPBF can operate with external oscillator. The external oscillator frequency can be programmed using the FREQ pin, allowing the user to set the output frequency of the switching regulator to match the application’s requirement. The device also has a soft start circuit which provides a gradual ramping up of the power levels to minimize the output noise and input surge current. The LTC3884ERHE-1#TRPBF operates over an industrial temperature range of -40°C to +85°C for guaranteed performance in harsh industrial applications.

Conclusion

The Linear Technology Corporation’s LTC3884ERHE-1#TRPBF is a high-performance, current-mode, dual PWM synchronous step-down switching regulator controller. It is designed for low input voltage and high-current applications, including automotive, industrial, and communication. The LTC3884ERHE-1#TRPBF provides adjustable operating frequency, internal fixed-frequency oscillator, soft start and output voltage margining for easy system-level optimization. The device operates over an industrial temperature range of -40°C to +85°C, enabling it to be used effectively in harsh industrial applications.

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