03 November 2009
Synchronous step down dc/dc converter delivers up to 800mA
Linear Technology has launched the LTC3606B, a 2.25MHz, synchronous buck regulator with programmable average input current limit.
According to Linear, it can deliver up to 800mA of continuous output current with efficiencies as high as 96%.
Using a constant frequency and current mode architecture, the LTC3606B operates from an input voltage range of 2.5 to 5.5V, making it suitable for single cell Li-Ion and usb applications. It can generate output voltages as low as 0.6V, enabling it to power the latest generation of low voltage dsps and microcontrollers.
It uses a switching frequency of 2.25MHz, allowing the use of tiny, low cost ceramic capacitors and inductors less than 1mm in height.
The LTC3606B offers a programmable average input current limit that can be programmed between 200 and 800mA, with ±5% accuracy via a single resistor. This makes the LTC3606B suitable for usb applications, supercapacitor charging and point of load power supplies. Combined with a supercapacitor, the LTC3606B enables its output to deliver high peak load currents of up to 2A without collapsing the input supply for applications such as GSM amplifiers. It also utilizes low dropout 100% duty cycle operation to allow output voltages equal to VIN, further extending battery run time.
The LTC3606B uses a pulse skipping mode to optimize light load efficiency while minimizing switching interference in applications that require the lowest possible noise.
Other features include independent soft-start and power good indication, short-circuit protection and internal compensation. The LTC3606B is an ideal solution for handheld applications, which require input current limiting, outputs of up to 800mA, high efficiency and a very small solution footprint.
The LTC3606EDD is available from stock in a 3mm x 3mm DFN-8.
Author
Chris Shaw
Supporting Information
Websites
http://www.linear.com
Companies
Linear Technology (UK) Ltd
This material is protected by Findlay Media copyright
See Terms
and Conditions.
One-off usage is permitted but bulk copying is not.
For multiple copies contact the
sales team.