Linear unveils step-down switching regulator

Linear Technology has announced the LT3653, a 1.2A, 1.5MHz monolithic current-mode step-down switching regulator with a programmable output current limit.

Typically, it is used with battery charger power path controllers to pre-regulate the output and optimise battery charger efficiency.

Its wide operating input voltage of 7.5V to 30V makes the LT3653 suitable for a variety of input sources, including unregulated 12V wall adapters, 24V industrial supplies and Firewire, as well as automotive applications.

Onboard input overvoltage lockout protects the device through input transients as high as 60V, such as those commonly found in automotive applications.

The LT3653's control pin VC is available for external battery tracking, known as Bat-Track control.

This function keeps the output voltage only 300mV above the Li-ion battery voltage, which minimises thermal issues while optimising charger efficiency.

Similarly, the LT3653 offers an adjustable output current limit that can be set between 400mA and 1.2A via an external resistor.

The LT3653 does not allow reverse discharge from the battery to VIN, eliminating the need for a blocking FET.

It also uses a 1.5MHz oscillator, internal compensation and an internal boost diode to minimise its overall footprint.

Combined with a 2mm x 3mm DFN package, the LT3653 offers a very compact, high-voltage input regulator for battery charger applications.

An industrial grade, the LT3653IDCB is tested and guaranteed to operate in a -40C to 125C operating junction temperature.

Both versions are available from stock.

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