Low-Noise Step-Down Switching Regulator delivers up to 15 mA.

Press Release Summary:

Supplied in 2 x 2 mm, 8-lead DFN package, LTC3620 synchronous buck regulator operates from 2.9-5.5 V input and is adjustable to outputs down to 0.6 V. Internal synchronous switches deliver efficiencies up to 95%, and Burst Mode® operation requires only 18 µA quiescent current. Variable frequency architecture maximizes efficiency while minimizing noise and keeping out of audio range. Also available, LTC3620-1 option is internally programmed to provide 1.1 V output.

Original Press Release:

Ultralow Power 15mA Synchronous Low Noise Step-Down Switching Regulator

MILPITAS, CA - September 2, 2009 - Linear Technology announces the LTC3620, a high efficiency, synchronous buck regulator which can deliver up to 15mA from a very small footprint for single Li-Ion-powered applications. The internal synchronous switches deliver efficiencies as high as 95% while Burst Mode® operation requires only 18uA of quiescent current, maximizing battery run time. The LTC3620 can take a 2.9V-5.5V input, and is adjustable to outputs as low as the 0.6V, whereas the LTC3620-1 option is internally programmed to provide a 1.1V output, eliminating the need for external feedback resistors. The LTC3620's 2mm x 2mm DFN package with only four tiny externals, ensures a very compact solution footprint for a wide array of ultralow power applications.

The LTC3620 uses a unique variable frequency architecture to maximize efficiency while minimizing noise and keeping out of the audio range. Its switching frequency is proportional to the load current, and an internal frequency clamp keeps the minimum switching frequency at light loads above 50KHz making it ideal for applications such as Bluetooth headsets, hearing aids and other applications sensitive to audio interference. The frequency of this clamp is user adjustable by applying an external clock to the FMIN/MODE pin. Other features include soft-start, undervoltage lockout and low-battery detection.

Pricing for the LTC3620EDC and LTC3620EDC-1 start at $1.95 each, for 1,000-piece quantities. Both versions are available from stock. For more information, visit www.linear.com.

Summary of Features: LTC3620

High Efficiency: Up to 95%

Maximum Current Output: 15mA

Internal 50kHz Switching Frequency Clamp Minimizes Noise in the Audio Band

18µA IQ Current

Externally Programmable Frequency Clamp

2.9V to 5.5V Input Voltage Range

Low-Battery Detection

2.8V Undervoltage Lockout

0.6V Reference Allows Low Output Voltages

Shutdown Mode Draws <1µA Supply Current

Unique Low Noise Control Architecture

Internal Power MOSFETs

No Schottky Diodes Required


Tiny 2mm x 2mm 8-Lead DFN Package

Ultralow Power, Low Noise 15mA Synchronous Step-Down Switching Regulator

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, µModule® 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, µModule, Burst Mode and are registered trademarks of Linear Technology Corp. All other trademarks are the property of their respective owners.

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