LT8709IFE#PBF

Series:	--
Packaging:	Tube
Part Status:	Active
Output Type:	Transistor Driver
Function:	Step-Up, Step-Down, Step-Up/Step-Down
Output Configuration:	Positive or Negative
Topology:	Buck, Boost, Buck-Boost
Number of Outputs:	1
Output Phases:	1
Voltage - Supply (Vcc/Vdd):	-4.5 V ~ -80 V
Frequency - Switching:	100kHz ~ 750kHz
Duty Cycle (Max):	--
Synchronous Rectifier:	Yes
Clock Sync:	Yes
Serial Interfaces:	--
Control Features:	Enable, Frequency Control, Power Good, Soft Start
Operating Temperature:	-40°C ~ 125°C (TJ)
Package / Case:	20-TSSOP (0.173", 4.40mm Width) Exposed Pad
Supplier Device Package:	20-TSSOP-EP
Base Part Number:	LT8709

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LT8709IFE#PBF Application Field and Working PrinciplePMIC, or Power Management Integrated Circuits, are devices that are responsible for the conversion and regulation of power in electrical systems. They provide protection against out-of-specification operation, such as over and under voltage, over current, and abnormal temperatures. PMICs generally contain one or more DC-DC switching controllers.The LT8709IFE#PBF is a CMOS synchronous step-down DC-DC switching controller from Linear Technology. It offers high efficiency and wide input voltage range in a very small package. The device can operate at high frequency over 600 KHz, allowing for the use of small size inductor and capacitors. The LT8709IFE#PBF is suitable for applications such as portable equipment, battery operated systems, and communication networks.The LT8709IFE#PBF has two main operating modes: burst mode operation and pulse frequency modulation (PFM). In burst mode, the device switches at a fixed frequency and duty cycle, while in PFM mode the device adjusts both to optimize efficiency in low load situations. The device features current limit protection and an over-temperature protection circuit.The LT8709IFE#PBF has an integrated switch FET connected to its sense resistor that regulates the current which flows though. The PWM control block regulates the on-time duration of the device by varying the duty cycle of the switch. The device features a wide operating range adjustable from as low as 0.5V to as high as 6V, with output voltage range from 0.5V to 5.75V. The LT8709IFE#PBF can be used for a variety of applications such as power supplies for embedded systems, battery operated systems, DSPs and FPGAs, low quiescent current low-voltage applications, and portable equipment applications. Typical applications are handheld devices and notebooks, servers and storage products, network routers, set top boxes and gaming consoles, and automotive components.The LT8709IFE#PBF uses synchronous rectification to achieve low losses and high efficiency, while providing a wide input voltage range and a very small size. The device also features an adaptive on-time control to reduce noise, a built-in loop compensation, and a low-side current sense resistor to regulate output voltage.To summarize, the LT8709IFE#PBF is a CMOS synchronous step-down DC-DC switching controller from Linear Technology. It offers high efficiency and wide input voltage range in a very small package. This device can provide protection against over and under voltage, over currents, and abnormal temperatures, and can be used for a variety of applications including embedded systems, battery operated systems, hand held devices, and automotive components. The LT8709IFE#PBF features synchronous rectification, a wide input voltage range, adaptive on-time control, and a wide operating range adjustable from 0.5V to 6V.

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