LTC1261LIS8-4#TRPBF

Packaging:	Tape & Reel (TR)
Part Status:	Active
Function:	Step-Up/Step-Down
Output Configuration:	Negative
Topology:	Charge Pump
Output Type:	Fixed
Number of Outputs:	1
Voltage - Input (Min):	4.5V
Voltage - Input (Max):	5.25V
Voltage - Output (Min/Fixed):	-4V
Voltage - Output (Max):	--
Current - Output:	20mA
Frequency - Switching:	650kHz
Synchronous Rectifier:	No
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	8-SOIC
Base Part Number:	LTC1261
Series:	--

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Introduction
The LTC1261LIS8-4#TRPBF is a high efficiency PolyPhase buck switching regulator with low output ripple and adjustable output. It is specifically designed for microprocessor core-voltage applications, where high efficiency is required. This product features selectable operating frequencies and synchronization to an external clock. It is suitable for applications such as television or notebook microprocessors, and has a total efficiency of up to 95%.Application Field
The LTC1261LIS8-4#TRPBF is designed to deliver high-efficiency power conversion in a variety of applications, including computing, communication, industrial, and consumer applications. It is ideal for point-of-Load (PoL) applications such as computing and communication where high efficiency and low noise operation is desired. It is also suitable for applications requiring fine and accurate control of output voltage. Its internal digital power-management circuitry and scalability provide a high-accuracy output voltage regulation and improve system efficiency.Working Principle
The LTC1261LIS8-4#TRPBF consists of a constant voltage source, a bidirectional modulation circuit and a DPDT power controller. The constant voltage source is driven by the supply voltage and is responsible for compensating for input voltage variations and keeping the circuit within the operating limits. The bidirectional modulation circuit converts the main DC output from the constant voltage source into a waveform suitable for power conversion. The DPDT power controller is responsible for controlling the demand for power. The DPDT power controller is configured with an external potentiometer to limit the output current. The LTC1261LIS8-4#TRPBF is designed to provide high efficiency power conversion by exploiting the constant voltage source together with the two-phase technique. It switches the two phases independently at different switching frequencies, the result being a smoothed waveform at the output. This waveform has a low ripple dissipative and is suitable for non-interrupted application. The two switching frequencies increase the effective duty cycle and reduce losses. Conclusion
The LTC1261LIS8-4#TRPBF is a high efficiency PolyPhase buck switching regulator with low output ripple and adjustable output. It is specifically designed for microprocessor core-voltage applications, where high efficiency is required. It is suitable for point-of-Load (PoL) applications such as computing and communication where high efficiency and low noise operation is desired. Its internal digital power-management circuitry and scalability provide a high-accuracy output voltage regulation and improve system efficiency. Its two-phase technique enables it to deliver smooth, low ripple output waveforms and high efficiency power conversion.

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