The LTC3624 switches at a fixed 1MHz frequency, whereas the LTC3624-2 switches at 2.25MHz. Their constant frequency, current-mode architecture minimises switching noise while offering very fast line and load transient response. The LTC3624/-2 operates from an input voltage range of 2.7V to 17V, making it ideal for single cell or multi- cell Li-Ion stack inputs as well as 12V intermediate bus-powered systems. The combination of its 3 x 3 mm DFN package, high switching frequency and tiny, low cost capacitors and inductors ensures a highly compact solution footprint.
The LTC3624/-2’s 60nsec minimum on-time enables it to step-down 16V inputs to 2.5V with a 2.25 MHz switching frequency (LTC3624-2) without pulse skipping, minimising the size of external components thus offering a very compact, high efficiency 2A step-down solution. Its 3.5µA quiescent current suits it for always-on applications demanding maximum battery run time. For applications requiring the lowest possible noise, the LTC3624/-2 can be configured to run in pulse-skipping or forced continuous mode, reducing noise and potential RF interference. Additional features include a power good voltage monitor, internal compensation and thermal protection.
The LTC3624EDD and LTC3624EDD-2 are available in a 3 x 3 mm DFN-8 package, priced at $2.95 (1,000). Industrial grade versions, the LTC3624IDD and the LTC3624IDD-2 are guaranteed to operate over the -40°C to 125°C operating junction temperature range, priced at $3.25.
Linear Technology; www.linear.com/product/LTC3624