LTC3880EUJ-1#TRPBF

Frequency - Switching:	--
Base Part Number:	LTC3880
Supplier Device Package:	40-QFN (6x6)
Package / Case:	40-WFQFN Exposed Pad
Operating Temperature:	-40°C ~ 105°C (TA)
Control Features:	Enable, Frequency Control
Serial Interfaces:	I²C, PMBus
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	--
Series:	PolyPhase®
Voltage - Supply (Vcc/Vdd):	4.5 V ~ 24 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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The Application Field and Working Principle of LTC3880EUJ-1#TRPBF

The LTC3880EUJ-1#TRPBF is a single-phase, synchronous step-down DC/DC controller. It is part of a Linear Technology’s PMIC - Voltage Regulators - DC DC Switching Controllers range. It has a wide operating frequency range of 160 kHz to 2.4 MHz, serves multiple output voltages, and draws less than 1/4th of a watt of quiescent current. The integrated protection features include input overvoltage protection, current limit, power enabled logic, over temperature protection and crossover protection.

Description

The LTC3880EUJ-1#TRPBF is a single-phase Synchronous Buck DC/DC controller specifically designed for microprocessor core voltage supplies in servers and embedded systems. With its advanced features, the LTC3880EUJ-1#TRPBF ensures improved system stability as well as improved system efficacy. The device has a wide output voltage range of 0.71 V with step resolution of 10 mV and Output Voltage accuracy of +/-1%. It is suitable for very dense systems like Infiniband and other Optical switching modules, base station power systems and advanced server applications with multiple output voltages that need to use a minimum number of components. The LTC3880EUJ-1#TRPBF comes in a small 8-lead TSSOP package, has an operational temperature range of -40°C to 85°C and is programmable via the inductor-current sensing technique.

Features

The LTC3880EUJ-1#TRPBF has some of the following features:

• Two Independent Output Voltage Control Loops
• High Efficiency Synchronous Rectification Control
• Input Voltage Range: 4.75 V to 38 V
• Output Voltage Range: 0.71 V
• Integrated Low Side and High Side MOSFETs
• High Frequency Operation up to 2.4 MHz
• Programmable Overcurrent Limit
• Overvoltage Protection
• Undervoltage Lockout
• Thermal Shutdown with Hysteresis

Working Principle of the LTC3880EUJ-1#TRPBF

The working principle of the LTC3880EUJ-1#TRPBF is based on the use of an inductor. In essence, the device simply alternately turns on and off the high side and low side power MOSFETs in order to transfer energy from the input to the output. When the power MOSFETs are in the off state, the inductor stores the energy from the input voltage and, when the transistors are switched on, it delivers the stored energy to the output. The device has two control loops that can be used to program the output voltage and regulate the output current. The first control loop is the voltage control loop. This is responsible for setting the desired output voltage, using feedback from the output voltage divider network. The voltage control loop monitors the error amplifier output and compensates with changes in duty cycle to maintain the output voltage set point. The second control loop is the current limit control loop. This loop monitors the inductor current and prevents the output current from exceeding the programmed current limit by reducing the average inductor current when the programmed limit is exceeded. In addition to the two independent control loops, the device also includes several protection features. These include input overvoltage protection, current limit, power enabled logic, over temperature protection and crossover protection.

Applications

The LTC3880EUJ-1#TRPBF is suitable for a variety of applications such as:

• Servers, Workstations and Embedded Systems
• Power Grid and Telecommunications Infrastructures
• High Performance ASICs, FPGAs, and SoCs
• Point - of - Load (POL) regulators
• Battery Powered Systems
• Core Voltage Supplies in Enterprise Systems

Conclusion

The LTC3880EUJ-1#TRPBF is a single-phase synchronous step-down DC/DC controller. It features two independent output voltage control loops, high efficiency synchronous rectification control, input voltage range from 4.75 V to 38 V, and a wide operating frequency range of 160 kHz to 2.4 MHz. Furthermore, it has integrated protection features such as input overvoltage protection, power enabled logic, over temperature protection and crossover protection. The LTC3880EUJ-1#TRPBF is suitable for servers, industrial applications, and power grid and telecommunications infrastructures.

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