LTC3555IUFD-3#TRPBF

Series:	PowerPath™
Packaging:	Tape & Reel (TR)
Part Status:	Active
Applications:	Handheld/Mobile Devices
Current - Supply:	--
Voltage - Supply:	4.35 V ~ 5.5 V
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	28-WFQFN Exposed Pad
Supplier Device Package:	28-QFN (4x5)
Base Part Number:	LTC3555

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Introduction
The LTC3555IUFD-3#TRPBF is a multi-function buck-boost DC/DC converter IC (integrated circuit) designed for small-sized and highly efficient DC/DC power supplies. This switching regulator is a viable solution for portable and battery-powered applications where a ripple-less, linear output voltage is required. With an input voltage from 2.5V to 15V, the buck-boost current-mode synchronous switching regulator offers a wide range of output voltage from 0.8V to 15V and supports up to 1.5A output current with a 93% efficiency. The LTC3555IUFD-3#TRPBF features an auto-restart mode, single-pin voltage monitoring, low-battery reset, and two-stage power fail flag circuitry that effectively assists system designers in optimizing power management accuracy, power losses, and system reliability.

Application Field
Since its initial release in 2010, the LTC3555IUFD-3#TRPBF, with its DC/DC buck-boost voltage regulator, has been widely accepted by power management design engineers. With its all-integrated functionality and its precise current-mode operation, the LTC3555IUFD-3#TRPBF has been installed in various electronic products. The applications of the device include but not limited to the following:

• Vehicle applications, such as automotive audio systems, alternator-driven main power supplies for cellular phones, camcorders, and portable navigation units.
• Mobile communication handsets, such as CDMA or GSM handsets and accessories.
• Consumer products, such as digital still cameras, portable LCD TVs, or DVD players.
• Industrial control, measurement, and medical systems.
• Portable computing and networking, such as notebook PCs and PDAs.

Working Principle
The working principle behind the LTC3555IUFD-3#TRPBF is a synchronous buck-boost DC/DC converter that uses a combination of current-mode and voltage mode control to maintain a steady output voltage and minimize power loss over a wide input voltage range. This device employs a sophisticated control system that uses current-mode control for fast and accurate response, while the voltage mode control ensures stability of the overall system. The output voltage can be selected by adjusting a single resistor divider, and the current-mode control allows for hasself-correcting operation in the presence of noise signals. This device also includes four low power CMOS switches (2 P-Ch and 2 N-Ch) to minimize power loss and allow for a high switching frequency. This high frequency allows for small physical size of the LTC3555IUFD-3#TRPBF and permits it to be easily integrated into designs with limited PCB space.

The LTC3555IUFD-3#TRPBF integrates a range of power management functions, like an auto-restart mode, under-voltage lockout, thermal protection, 2-stage power-fail flag circuitry, and single-pin Voltage Monitoring pin (VMON). All these built-in functions make the LTC3555IUFD-3#TRPBF an excellent solution for meeting power supply design requirements in mobile, medical, and industrial applications.

Conclusion
The LTC3555IUFD-3#TRPBF is a specialized DC/DC voltage regulator designed for power management applications. Its features, such as the current-mode and voltage mode synchronous control, CMOS switches, and power management functions, make it suitable for a variety of applications in automotive, mobile communications, consumer electronics, industrial control, and portable computing and networking. Its size and efficiency are also great advantages that make it a preferred choice for many designers.

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