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Synchronous buck regulator is adjustable to 0V

Posted: 17 Feb 2012     Print Version  Bookmark and Share

Keywords:buck regulator  switching regulator  resistor 

Linear Technology Corp. introduces the LTC3600, a 1.5A synchronous buck regulator that uses a 50µA current reference, combined with a single resistor to set the output voltage, can be paralleled for higher current applications and is adjustable down to 0V.

According to the company, the product's design enables easy current sharing among multiple regulators, setting the output voltage for all of the regulators with a single external resistor.

The switching regulator's input voltage capability ranges from 4-15V, targeting dual-cell li-ion applications, as well as fixed 5V and 12V intermediate bus systems. The LTC3600 offers synchronous rectification with efficiencies as high as 96 per cent and a design that allows dynamic adjustment of output voltage from 0V to VIN-0.5V, offering virtually rail-to-rail performance, according to Linear.


The LTC3600 uses a 50µA current reference.

The device's ability to provide zero output enables it to power down individual rails in the system as needed. Its on-chip trimmed reference achieves accuracy of ±1 per cent, noted the company. Furthermore, output regulation and transient response are independent of output voltage. Output voltage tracking or soft start is easily programmed via the ISET pin for applications that require power sequencing.

The LTC3600's VIN and VOUT capability, tight line and load regulation, high efficiency, low external parts count and parallel capability make it ideal for modern multi-rail systems, according to Linear. The device's 200kHz to 4MHz switching capability enable use of tiny, low cost capacitors and inductors. Additional features include a power good voltage monitor, external synchronisation capability and thermal protection.

The LTC3600EDD is available in a 3 x 3mm DFN-12, and the LTC3600EMSE is offered in a 12-lead, thermally enhanced MSOP package. Pricing for both package options starts at Rs.142.86 ($2.80) each in 1,000-piece quantities. Industrial grade versions, the LTC3600IDD and LTC3600IMSE, are guaranteed to operate from -40°C to 125°C operating junction temperature and are priced at Rs.164.29 ($3.22) each in 1,000-piece quantities. All versions are available from stock.

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