Step-Down DC/DC Converter consumes 2.5 µA in no load conditions.

Press Release Summary:

LT3990 utilizes 550 A, 300 mV switch, with boost and catch Schottky diodes, oscillator, control and logic circuitry integrated into single die. Operating from 4.3-60 V input, it delivers up to 350 mA of continuous output is suited for applications that need continuous output with ultralow power drain. Switching frequency is user programmable from 200 kHz to 2.2 MHz, and Burst Mode® operation ensures high efficiency at low output currents while keeping output ripple below 5 mVpk-pk.

Original Press Release:

60V, 350mA(IOUT), 2.2MHz Step-Down DC/DC Converter

MILPITAS, CA - Linear Technology Corporation announces the LT3990, a 350mA, 60V ultralow quiescent current step-down switching regulator. Its Burst Mode® operation keeps quiescent current under 2.5µA in no load condition. The LT3990's 4.3V to 60V input voltage range makes it ideal for automotive and industrial applications that need continuous output with ultralow power drain. Its internal 550mA switch can deliver up to 350mA of continuous output current at voltages as low as 1.21V. The LT3990's Burst Mode operation provides ultralow quiescent current, well suited for automotive or industrial systems, which demand always-on operation and optimum battery life. Switching frequency is user programmable from 200kHz to 2.2MHz, enabling the designer to optimize efficiency while avoiding critical noise-sensitive frequency bands. The combination of its 10-lead 3mm x 2mm DFN-10 (or MSOP) package and high switching frequency keeps external inductors and capacitors small, providing a very compact, thermally efficient footprint.

The LT3990 utilizes a high efficiency 550mA, 300mV switch, with the necessary boost and catch Schottky diodes, oscillator, control and logic circuitry integrated into a single die. Low ripple Burst Mode operation ensures high efficiency at low output currents while keeping output ripple below 5mVPK-PK. Special design techniques and a new high voltage process enable high efficiency over a wide input voltage range, and the LT3990's current mode topology enables fast transient response and excellent loop stability. Other features include a power good flag soft-start capability and output short protection.

The LT3990EDDB is packaged in a 3mm x 2mm DFN-10, and the LT3990EMS is packaged in a MSOP-10, priced starting at $2.55 and $2.60 each, respectively for 1,000 piece quantities. The LT3990IDDB and LT3990IMS are tested and guaranteed to operate from a -40ºC to 125ºC operating junction temperature and are priced at $2.83 and $2.89 each, respectively in 1,000 piece quantities. All versions are available from stock. For more information, visit

Summary of Features: LT3990
o Low Ripple Burst Mode® Operation
o 2.5µA IQ at 12VIN to 3.3VOUT
o Output Ripple < 5mVP-P
o Wide Input Voltage Range: 4.3V to 60V Operating
o Adjustable Switching Frequency: 200kHz to 2.2MHz
o Integrated Boost & Catch Diodes
o 350mA Output Current
o Accurate 1V Enable Pin Threshold
o Low Shutdown Current: IQ = 0.7µA
o Internal Sense Limits Catch Diode Current
o Power Good Flag
o Output Voltage: 1.21V to 25V
o Internal Compensation
o Small 10-Pin MSOP & (3mm × 2mm) DFN Packages
o 60V 350mA (IOUT), 2.2MHz Step-Down Switching Regulator in 3mm × 2mm DFN

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.

Worldwide Contacts

North America and General Information
John Hamburger
Tel: (408) 432-1900 ext. 2419

Doug Dickinson
Tel: (408) 432 1900 ext. 2233

China (PRC)
Fanny Lau
Tel: 852-2428-0303

Yoshikazu Funasaki
Tel: 81-3-5226-7291

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