Linear Technology Rolls Out LTC3564 Synchronous Buck Regulator

Linear Technology announces the LTC3564, a high efficiency, 2.25MHz, synchronous buck regulator that can deliver up to 1.25A of continuous output current from a 2mm x 3mm DFN or ThinSOT package. Using a constant frequency current mode architecture, the LTC3564 operates from an input voltage range of 2.5V to 5.5V, making it ideal for Li-Ion battery inputs as well as 3.3V or 5V inputs for point-of-load 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 utilizes a constant 2.25MHz switching frequency, enabling the use of tiny, low cost ceramic capacitors and inductors less than a 1mm in height, providing a very compact solution footprint.

LTC3564 1.25A, 2.25MHz Synchronous Step-Down DC/DC Converter - Linear TechnologyThe LTC3564 uses internal switches with an RDS(ON) of only 0.15Ohm (N-Channel and P-Channel) to deliver efficiencies as high as 96%. It also has low dropout 100% duty cycle operation to extend battery run-time. The LTC3564 utilizes automatic Burst Mode[tm] operation to achieve only 20uA of no load quiescent current and less than 1uA in shutdown. Other features include ±2% output voltage accuracy, current mode operation and over-temperature protection.

The LTC3564EDBC is available in a 2mm x 3mm DFN-6 package while the LTC3564ES5 is available in a 5-lead ThinSOT package. Both versions are available from stock. Pricing starts at $1.95 each for both parts in 1,000-piece quantities. The LTC3564IDBC and LTC3564ISS are both tested and guaranteed to operate from a -40°C to 125°C junction temperature. They are both priced at $2.24 in 1,000-piece quantities and are available from stock.

Summary of Features: LTC3564

  • High Efficiency: Up to 96%
  • Very Low Quiescent Current: Only 20uA
  • 1.25A Output Current
  • 2.5V to 5.5V Input Voltage Range
  • 2.25MHz Constant Frequency Operation
  • No Schottky Diode Required
  • Low Dropout Operation: 100% Duty Cycle
  • 0.6V Reference Allows Low Output Voltages
  • Shutdown Mode Draws =1uA Supply Current
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Over-temperature Protected
  • Low Profile (1mm) ThinSOTTM & 6-Lead 2mm × 3mm DFN Packages

About Linear Technology
Linear Technology Corporation, a manufacturer of high performance linear integrated circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major public companies in 2000. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, uModule[tm] products, and many other analog functions. Applications for Linear Technology’s high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems.

LT, LTC, LTM, and Burst Mode are registered trademarks and uModule and ThinSOT are trademarks of Linear Technology Corp.