LT1317CMS8#TRPBF

Voltage - Output (Min/Fixed):	1.24V
Base Part Number:	LT1317
Supplier Device Package:	8-MSOP
Package / Case:	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C (TA)
Synchronous Rectifier:	No
Frequency - Switching:	620kHz
Current - Output:	710mA (Switch)
Voltage - Output (Max):	30V (Switch)
Series:	--
Voltage - Input (Max):	12V
Voltage - Input (Min):	1.5V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Boost, SEPIC
Output Configuration:	Positive
Function:	Step-Up, Step-Up/Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LT1317CMS8#TRPBF DC-DC Switching Regulator Application and Working Principle

The LT1317CMS8#TRPBF is a high-performance DC-DC switching regulator designed to deliver efficient, regulated output power with minimal impairment. The device\'s wide input and output voltage range, high efficiency, and load regulation make it ideal for a variety of applications. In this article, we will discuss the technical specifications of the LT1317CMS8#TRPBF and its application fields and typical working principles.

Device Specifications

The LT1317CMS8#TRPBF is a step-up DC-DC switching regulator designed to accept an input voltage range of 2.7V to 18V and provide an output voltage range scaled above the input voltage up to 30V. The device features an adjustable switching frequency from 1MHz to 3MHz, allows for fast current-loop settling, with a lightly-regulated current limit for improved efficiency. Its output ripple is <1500mV rms, with the transient response having a typical slope of 150mV/μs.The device offers an external synchronization feature for improved noise performance in applications where other switching regulators are present. It also features external voltage control with a lockout to ensure that the output voltage is not damaged over long time periods. The device also has an advanced EMI filter, preventing switch-mode noise from passing into the circuitry.

Applications

The LT1317CMS8#TRPBF is suitable for applications requiring high efficiency, low output ripple, fast transient response, and a wide input and output voltage range. It can be used in portable electronics, handhelds, battery-powered systems, telecom systems, automotive electronics, and DC-DC converters.

Working Principle

The LT1317CMS8#TRPBF utilizes a common-collector switching regulator circuit structure, which is robust and simple to implement. In this circuit, an N-channel MOSFET is used as a controlled switch to convert the input voltage to the desired output voltage. The switch is turned on and off in a pulse-width modulated (PWM) fashion, based on the current-sense voltage, output voltage, and the reference voltage. The switching frequency is determined by an on-chip oscillator, which can be synchronized to an external clock frequency. When the switch is on, energy is stored in the inductor and transferred to the output capacitor. When the switch is off, the output capacitor supplies energy to the load. A controlled current-sense amplifier is used to limit the amount of current flowing through the switch, as well as to regulate the output voltage by modulating the peak current of the switch.

Conclusion

The LT1317CMS8#TRPBF is an excellent choice for high-efficiency, high-input voltage applications, such as portable electronics, handhelds, battery-powered systems, and telecommunications systems. Its common-collector switching regulator circuit is robust and simple to implement. Its wide input and output voltage range, fast current-loop settling, low output ripple, and external synchronization feature make it ideal for boosting a wide range of output voltages.

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