LTC1261CS8#PBF

Voltage - Output (Min/Fixed):	-1.25V
Base Part Number:	LTC1261
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C (TA)
Synchronous Rectifier:	No
Frequency - Switching:	550kHz
Current - Output:	12mA
Voltage - Output (Max):	-8V
Series:	--
Voltage - Input (Max):	8V
Voltage - Input (Min):	3V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Charge Pump
Output Configuration:	Negative
Function:	Step-Up/Step-Down
Part Status:	Active
Packaging:	Tube

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Introduction

The LTC1261CS8#PBF is a DC-DC step-down switching regulator designed and developed by Linear Technology Corporation. It is a monolithic integrated circuit that combines a synchronous buck converter and a linear regulator. The IC operates from an input voltage of 4.5V to 30V and delivers up to 10A of continuous current. It features a wide programmable output voltage range (from 0.8V to 27V), adjustable switching frequency (from 250 kHz to 2.2 MHz), and a fast transient response (less than 10 us).

Application Field

The LTC1261CS8#PBF is mainly used for powering applications that require a high current step-down regulator with a wide programmable output voltage range. The IC is ideal for applications such as industrial testing and measurement, gaming, consumer electronics, servers and storage, broadcast, computing and networking equipment, instrumentation equipment, automotive, and power supplies for consumer, industrial, and aerospace equipment.

Working Principle

The LTC1261CS8#PBFis an integrated switching regulator that combines a synchronous buck converter and a linear regulator. The voltage regulator has an internal Power MOSFET that switches at a predetermined switching frequency. The output voltage of the regulator is adjustable by changing the Duty Cycle of the internal Power MOSFET.The synchronous buck converter is driven by a current limit and pulse-width modulation (PWM) current mode controller. The PWM current mode controller ensures fast transient response and excellent regulation accuracy. It also provides the capability to adjust the current limit and the switching frequency via external resistors.The linear regulator has an adjustable reference voltage, feedback voltage offset, current limit, and under-voltage lockout. The linear regulator also has a low harmonic distortion and a current mode control design.

Conclusion

The LTC1261CS8#PBF is a monolithic DC-DC step-down switching regulator that is capable of delivering up to 10Amps of continuous current. The IC combines a synchronous buck converter and a linear regulator, and features wide programmable output voltage range (from 0.8V to 27V), adjustable switching frequency (from 250 kHz to 2.2 MHz), and fast transient response. The LTC1261CS8#PBF is ideal for powering applications that require a high current step-down regulator with wide programmable output voltage range such as industrial testing and measurement, gaming, consumer electronics, servers and storage, broadcast, computing and networking equipment, instrumentation equipment, automotive, and power supplies for consumer, industrial, and aerospace equipment.

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