LTC1261CS8#TRPBF

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:	Tape & Reel (TR)

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LTC1261CS8#TRPBF Application Field and Working Principle

The LTC1261CS8#TRPBF, manufactured by Linear Technology Corporation, is a wide input voltage range, fixed frequency current mode DC/DC controller IC with integrated MOSFETs. It is primarily designed for low noise, high efficiency, synchronous step-down DC/DC power supplies where output voltage is adjustable by the external voltage divider. The LTC1261CS8#TRPBF is the smallest and most advanced device in Linear Technology Corporation\'s growing portfolio of ultra-low noise DC/DC controllers.The IC comes in an 8-lead TSSOP package with very simple power supply circuit which includes an external P-channel and N-channel MOSFET, an inductor and input/output capacitors. The IC has a wide 4.5 V to 28 V input voltage range with a rated current of 3A, a typical operating frequency of 400 kHz, and an output voltage range from 0.8 V to V IN . It also uses an advanced constant frequency current mode architecture for excellent line and load regulation, very fast transient response and easy loop compensation.

Applications

The LTC1261CS8#TRPBF is designed for low power (30W up to 100W) applications, including automotive, industrial, communications and consumer electronics products. It can be used in applications such as DC/DC converters, note books, cell phones, USB ports, automotive systems, display power supplies, game consoles, digital TVs, and LCD monitors.

Working Principle

The LTC1261CS8#TRPBF is essentially a monolithic switching regulator with a wide input voltage range, current-mode pulse width modulation (PWM) control and low on-resistance integrated power MOSFETs. It works on the principle of converting a higher DC input voltage to a lower DC output voltage by chopping off the part of the input voltage in accordance with the clocked switching pattern. In this way, the output voltage is obtained based on the switching pattern rather than relying on the input voltage.The IC employs a current-mode architecture to operate in synchronous buck PWM mode to offer fast transient response and excellent line and load regulation. Its 0.8V to 15V adjustable output voltage range is achieved through an external voltage divider with a gain of 0.6V/V for more precise output voltage setting.The IC\'s advanced features include onboard synchronous rectification, adaptive on-time control, adjustable input to output delay, adjustable current limit and programmable soft-start. It also incorporates Over-Temperature Protection (OTP) for eliminating excessive die temperature and over-current protection for excessive peak current.All these features combine to make the LTC1261CS8#TRPBF an ideal choice for low power (30W up to 100W) applications. It is highly reliable, easy to use and cost-effective.

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