TL2843DR Integrated Circuits (ICs)

Frequency - Switching:	Up to 500kHz
Base Part Number:	TL2843
Supplier Device Package:	14-SOIC
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	97%
Series:	--
Voltage - Supply (Vcc/Vdd):	7.6 V ~ 30 V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost, Flyback, Forward
Output Configuration:	Positive
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

TL2843DR is a highly integrated DC-DC switching controller specifically designed for high conversion efficiency, high accuracy and high performance in mobile applications. Depending on the application, TL2843DR can provide up to 4V output voltage with up to 4A drive current. It offers features such as low quiescent current, low ripple output voltage, constant switching frequency and input voltage range from 1.8V to 6V.

Application field

TL2843DR can be used for wide range of applications, such as cellular phone and PDA charging IC, portable navigation, digital still cameras and portable media players. It is also suitable for use in system controllers and ASIC power systems. With its advanced features, TL2843DR is ideal for battery-operated applications which require high efficiency and energy savings.

Working principle

TL2843DR works on the principle of switch mode power supply (SMPS). This type of power supply uses a semiconductor switch to control the power flow and is highly efficient. The switch mode power supply circuit consists of a power transformer, rectifier and filter, an oscillator and a switch. The switch works as an electrical switch, which opens and closes repeatedly, to allow the flow of power. The controller operates in Pulse Width Modulated (PWM) scheme. PWM is the technique of generating a square wave where the ratio between the “on” state and “off” state of the switch determines the average output voltage. The output voltage is controlled by varying the duty cycle of the PWM signal. The TL2843DR is capable of switching frequencies up to 500kHz depending on the application.

Output voltage regulation

The TL2843DR is capable of providing up to 4V output voltage with up to 4A drive current. It can support up to 5V input voltage range and is capable of regulating to 0.5% accuracy at 3.3V and 0.8% accuracy at 1V output voltage.

Protection features

TL2843DR is protect against over-current, thermal cut-off and undervoltage lockout. It is also capable of providing both input and output reverse polarity protection.

Conclusion

TL2843DR is a highly integrated DC-DC switching controller specifically designed for high conversion efficiency, high accuracy and high performance in mobile applications. It offers features such as low quiescent current, low ripple output voltage, constant switching frequency and input voltage range from 1.8V to 6V. It can support up to 5V input voltage range and is capable of regulating output voltage to 0.5% accuracy at 3.3V and 0.8% accuracy at 1V. In addition, it features protection features such as over-current, thermal cut-off,undervoltage lockout, as well as input and output reverse polarity protection. Therefore, with its advanced features, TL2843DR is ideal for battery-operated applications which require high efficiency and energy savings.

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