LTC1261LCS8-4#PBF

Voltage - Output (Min/Fixed):	-4V
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:	650kHz
Current - Output:	20mA
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	5.25V
Voltage - Input (Min):	4.5V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Charge Pump
Output Configuration:	Negative
Function:	Step-Up/Step-Down
Part Status:	Active
Packaging:	Tube

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LTC1261LCS8-4#PBF - Voltage Regulators - DC DC Switching Regulators Application Field and Working PrincipleThe LTC1261LCS8-4#PBF, an integrated circuit-embedded switching regulator, is a type of voltage regulator designed to convert a specific voltage level to the desired output voltage level. It is a high efficiency, low voltage- dropout switching regulator with a user programmable oscillator frequency to optimize efficiency and minimize external component count. This device is utilized in a wide range of applications that require conversion of input voltage levels, ranging from 2V to 40V.ApplicationsThe device is well-suited for diverse applications such as:

• Automotive electronics
• Industrial equipment
• Portable products
• Test and Instrumentation
• Battery-powered products
• Home telecom setups
• Computer peripherals
• LED displays
• Medical devices
• Power sourcing equipment

Working PrincipleThe LTC1261LCS8-4#PBF operates by converting input voltage levels to the desired output voltage level. It utilizes a charge pump circuit to provide the regulated voltage to the output.The device comprises of two main components, the oscillator and the FET switches that are responsible for controlling the charge pumping and switching process. During the start-up, the device produces a high voltage output that is used to pre-charge the output before the regulator starts working. During operation, the oscillator produces an internal clock signal, which is used to generate the series of high and low voltage outputs that are fed to the FET switches.The FET switches then open and close alternately, allowing the stored energy from the higher voltage to flow through the FET switches and be discharged at the output terminal for regulation. This regulated voltage output is monitored by a feedback circuit and the internal oscillator frequency is adjusted accordingly to maintain the output voltage to the desired value.The converter is also equipped with a power-save mode that helps minimize power consumption. In this mode, the device automatically reduces the internal oscillator frequency when the input voltage drops to save power. This mode also helps to protect the device from overcurrent as it reduces the power consumption by a wide margin in times of low voltage input.In addition, the device also provides thermal shut down that helps protect the circuit from operating in hazardous conditions. Moreover, the device also features overvoltage protection, on-chip ESD protection, adjustable current limit and soft start functions to ensure reliability and safety.The device also has a wide operating temperature range of -40°C to +125°C and output current capability up to 2A. The device is capable of providing a wide range of output voltage levels from 0.8V to 38V. These features make the device ideal for a variety of applications that require high efficiency and low voltage-dropout conversion.In conclusion, the LTC1261LCS8-4#PBF is an integrated circuit-embedded switching regulator well suited for a range of applications such as automotive electronics, industrial equipment and battery-powered products. It requires minimal external components to operate and provides high efficiency, over-voltage protection and on-chip ESD protection to ensure reliability and safety.

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