Voltage - Output (Min/Fixed):	2.5V
Base Part Number:	LTC3440
Supplier Device Package:	10-MSOP
Package / Case:	10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	Yes
Frequency - Switching:	300kHz ~ 2MHz
Current - Output:	600mA
Voltage - Output (Max):	5.5V
Series:	--
Voltage - Input (Max):	5.5V
Voltage - Input (Min):	2.5V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck-Boost
Output Configuration:	Positive
Function:	Step-Up/Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LTC3440EMS#TRPBF Application Field and Working Principle

Introduction

The LTC3440EMS#TRPBF is a DC DC switching regulator chip from Linear Technology Corporation (LTC). This chip is designed to employ a synchronous step-down converter and is suitable for applications that require high efficiency and low cost, such as consumer electronic equipment, mobile communications and integrated LCD power supplies. The device is rated for input voltages up to 36V and continuous output current up to 1.2A.

Application Field

The LTC3440EMS#TRPBF is a versatile DC/DC switching regulator chip designed to deliver power efficiently and reliably in a wide range of consumer electronic and other applications. The device can be used to supply power to various load types such as mobile phones, consumer digital cameras, PDAs, power banks, wearable devices, MP3 players, and digital TV. The device also has a wide range of compatibility due to its synchronous rectification and a high efficiency level of up to 94%. Additionally, the integrated soft-start feature and over-current protection indicate that the device can effectively protect the circuit from damage.

Working Principle

The LTC3440EMS#TRPBF is an ideal device for applications requiring a stable DC/DC power supply. The device is based on a synchronous step-down topology with a current-mode fixed frequency control scheme. The integrated control loop adjusts the on-time of the internal N-channel MOSFET switch to regulate the output voltage. The device consists of an internal voltage reference, an oscillator, a pulse width modulator (PWM), an error amplifier, and an internal high-side and low-side switch. For constant switching frequency operation, the oscillator frequency is adjusted by the OUTV pin with a resistance network. A feedback compensation network is used to control loop stability. The voltage reference provides the PWM with accurate and stable reference voltages. The integrated error amplifier is used for output voltage regulation and for soft-start and overload protection. The PWM comparator compares the input voltage at VIN and the voltage at the COMP pin, which is the output of the error amplifier. The PWM comparator turns on the internal N-channel MOSFET during on-times determined by the voltage error amplifier and turns it off during off-times determined by the oscillator.

Conclusion

The LTC3440EMS#TRPBF is a high-performance DC/DC switching regulator chip designed to work efficiently in a range of applications. The device has a wide input range of up to 36V and a continuous output current up to 1.2A. The synchronous topology and current-mode fixed frequency control scheme provide improved performance and less acoustic noise. With its versatile and efficient design, the LTC3440EMS#TRPBF is an excellent choice for applications that require a reliable DC/DC power supply.

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