Linear Tech Adds 400mA, 2.25MHz Synchronous Step-Down DC-DC Converter With Dual 150mA LDOs
Linear Technology announced the LTC3670, a 400mA, 2.25MHz, synchronous buck regulator and two 150mA LDOs packaged in a 2 x 3mm DFN. The LTC3670’s switching regulator and both LDOs are adjustable down to 0.8V, offering a very compact triple output converter for handheld applications. Its input voltage range of 2.5 to 5.5V makes it suitable for single cell Li-Ion powered applications.
The adjustable outputs are suitable for powering I/O, memory and core voltages of the latest DSPs and microcontrollers while each channel offers an independent enable pin. The buck regulator’s 2.25MHz switching frequency is said to enable the utilization of tiny, low cost externals, and to provide a very compact solution footprint for handheld applications.
The LTC3670’s synchronous buck delivers efficiencies as high as 93% and constant frequency, current mode operation minimizes noise while offering fast transient response. The internal LDOs require only 150mV of dropout voltage, providing two additional low noise outputs. The LTC3670’s BurstMode® operation minimizes quiescent current to only 70µA in no load conditions, maximizing battery run time. Other features include a Power-Good pin, internal soft-start and internal compensation.
The LTC3670 is available from stock in a 12-Lead 2 x3mm DFN package. Pricing starts at $1.95 each in 1,000-piece quantities.
