LTC1439EG#TRPBF

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The LTC1439EG#TRPBF is a precision dual synchronous step-up DC/DC converter that is optimized for space-constrained applications. Incorporating an internal switch, it can take input voltages from 2V to 20V and boost them up to a regulated output of 7V to 24V. The LTC1439EG#TRPBF has a current limit of 1A and is flexible enough to be used for Li-Ion battery charging.

It is suitable for many applications, particularly those that require a space efficient solution as it features a compact 6-lead (2x3) ThinSOT package. These packages have a low profile and are ideal for handheld device applications. It can also be used for solid-state lighting LED driver designs that require efficiency and a low parts count.

The LTC1439EG#TRPBF also includes a number of features that make it ideal for high efficiency mobile and battery-backed designs. It includes a switching frequency up to 1MHz that provides low critical loop components, hence they require minimal external components and noise. The device also has programmable soft-start and over-current protection functions that prevent any inrush current at start-up events.

In terms of operation, the LTC1439EG#TRPBF works in a manner typical of synchronous boost converters. The device begins with a logic-level enable control that signals the power MOSFET and begins an internal oscillator. The oscillator frequency is adjustable through an external resistor, and the power MOSFET switch is pulsed off and on at this fixed frequency.

The device is configured to produce a higher output voltage than the input voltage by using synchronous rectification. When the power MOSFET is turned off, the synchronous rectifier automatically starts to conduct current from the output to the source, making the output voltage higher than the input voltage. When the power MOSFET is switched on, the output voltage drops and current is sourced from the input.

The LTC1439EG#TRPBF is capable of running with a wide input voltage range and low input voltage quiescent current, making it very suitable for mobile device applications. It has an adjustable duty cycle with programmable soft start, making it suitable for a variety of products. Furthermore, it includes over switching and short-circuit protection and an adjustable output voltage which can be set with resistor dividers.

In summary, the LTC1439EG#TRPBF is a 6-lead (2x3) Thinsot package DC/DC converter with a wide input voltage range and adjustable duty cycles. It has current limit and programmable soft start functions, making it suitable for Li-Ion battery charging applications. Furthermore, it is capable of input voltage quiescent current and over-current protection for mobile device applications.

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