TL3842DRE4-8

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Output Type:	Transistor Driver
Function:	Step-Up, Step-Up/Step-Down
Output Configuration:	Positive
Topology:	Boost, Flyback, Forward
Number of Outputs:	1
Output Phases:	1
Voltage - Supply (Vcc/Vdd):	10 V ~ 30 V
Frequency - Switching:	Up to 500kHz
Duty Cycle (Max):	97%
Synchronous Rectifier:	No
Clock Sync:	No
Serial Interfaces:	--
Control Features:	Frequency Control
Operating Temperature:	0°C ~ 70°C (TA)
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	8-SOIC
Base Part Number:	TL3842

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TL3842DRE4-8 Application Field and Working PrinciplePMIC (Power Management Integrated Circuit) plays an important role in many current electronic products. It helps to reduce the power consumption, improve the efficiency and overall performance of products. Among many PMICs, TL3842DRE4-8 belongs to the Voltage Regulators – DC DC Switching Controllers. The application field and working principle of TL3842DRE4-8 will be discussed in detail in the following section. Application Field of TL3842DRE4-8TL3842DRE4-8 is a high-efficiency, high-output current (1.5A), 9V/18V buck (step-down) switching regulator that is suitable for use in many applications. It employs a fixed-frequency, valley controlled buck topology with a low ripple regulator. The device can provide an output voltage range from 5V up to 18V with a maximum output current of 1.5A. The TL3842DRE4-8 is a perfect choice for consumer products, cellular phones, digital cameras, PDA and other portable digital products. Working Principle of TL3842DRE4-8The TL3842DRE4-8 is an efficient, monolithic buck (step-down) switching regulator that operates on a fixed frequency in the valley mode. The device operates using current-mode control and includes an internal frequency compensation scheme. A voltage feedback loop is used to regulate the output voltage at the desired level. When the enable signal (EN) of the device is asserted high, an internal startup sequence begins to initialize the operation of the device. The device then enters a steady-state operation into a valley-locked mode, where a series of repetitive trips from one valley to the other is used to accurately regulate the output voltage. The TL3842DRE4-8 uses synchronous rectification to achieve high efficiency and achieve fast transient response. The external synchronous rectification MOSFETs are low side MOSFETs for greater efficiency. The device features thermal shutdown protection, reverse current protection, and current limit protection. ConclusionIn conclusion, the TL3842DRE4-8 is an efficient, monolithic buck (step-down) switching regulator that operates on a fixed frequency in the valley mode and provides an output voltage range from 5V up to 18V with a maximum output current of 1.5A. It is suitable for use in many consumer products, cellular phones, digital cameras, PDA and other portable digital products. It includes an internal frequency compensation scheme and provides thermal shutdown protection, reverse current protection, and current limit protection.

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