LT1268CQ#TRPBF

Voltage - Output (Min/Fixed):	1.244V
Base Part Number:	LT1268
Supplier Device Package:	5-DDPAK
Package / Case:	TO-263-6, D²Pak (5 Leads + Tab), TO-263BA
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	150kHz
Current - Output:	7.5A (Switch)
Voltage - Output (Max):	60V (Switch)
Series:	--
Voltage - Input (Max):	30V
Voltage - Input (Min):	3.5V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck, Boost, Flyback
Output Configuration:	Positive or Negative
Function:	Step-Up, Step-Down, Step-Up/Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

LT1268CQ#TRPBF is one of the power management integrated circuit (PMIC) commonly used in many electronic systems. It is a DC-DC switching regulator which has been widely employed in applications such as voltage regulation and power supply conversion. This article aims to provide a brief overview of the application field, working principle and suggest some tips when designing with the device.

Application Field

This controller is ideal for applications requiring a small and low cost solution for highly efficient DC-DC switching regulator. It is mainly used for powering microprocessors, DSPs and ASICs, as well as providing the conversion for high voltage power rails to low voltage and for low voltage rails to lower voltage applications. The LT1268CQ#TRPBF can also be used for a DC-DC flyback or buck converter, linear current mode, buck charge pump and boost plus inverter circuits. It also has an adjustable switching frequency which can be set from 50 to 400 kHz.

Working Principle

The LT1268CQ#TRPBF is a current mode switches that can operate in either pulse-width modulation (PWM) or pulse-frequency modulation (PFM) mode. It also features internal current setting for both the synchronous MOSFET and the p-channel switch as well as a synchronous rectifier, a low side current sense resistor, a low battery detect and a charge pump.The device also features a high and low side synchronous MOSFET with the switching node monitored by a transconductance amplifier. This combination allows the device to reduce switch on losses while providing precision current foldback. The internal current limit circuitry is used to ensure the maximum output current level and prevents damage to the integrated circuit and output FETs.

Design Tips

When designing with the LT1268CQ#TRPBF, it is important to keep the thermal design in mind. The device is designed to operate over a broad temperature range but with proper layout, heat sinking and thermal design, the system efficiency can be improved greatly.It is also important to remember the gate and source charge, which can cause excessive switching losses. These can be reduced by the use of gate drivers, which are available for the LT1268CQ#TRPBF.Finally, it is essential to ensure that the current sensing circuitry is accurate and reliable. This is because the current limit and voltage regulation accuracy are highly dependent on the current sense resistor. It is recommended that the sense resistor has a tolerance of at least 0.1%.

Conclusion

The LT1268CQ#TRPBF is a highly efficient and low-cost DC-DC switching regulator that is commonly used in many electronic systems. This article has provided a brief overview of its application field, principle and some design tips when using the device. By following the guidelines provided here, the designer should be able to optimize their system with ease.

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