Synchronous Buck Regulator supports DDR memory.
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Press Release Summary:
Offered in 4 x 4 mm QFN-24 or thermally enhanced TSSOP-24 packages, LTC3615 has constant frequency, current-mode architecture and internal switches with RDS(ON) of 55 and 75 mW that enable delivery of up to 3 A continuous output current from each channel. IC operates from 2.25-5.5 V, and low dropout operation provides output from 0.6 V to millivolts below VIN. With efficiencies up to 94%, product offers 400 kHz to 4 MHz user-programmable switching frequency and Burst Mode® operation.
Original Press Release:
General Purpose Dual 3A, 4MHz, Synchronous Step-Down Regulator Also Supports DDR Memory
MILPITAS, CA - Linear Technology introduces the LTC3615, a high efficiency, 4MHz synchronous buck regulator that incorporates a constant frequency, current-mode architecture. Low resistance internal switches enable the LTC3615 to deliver up to 3A of continuous output current from each channel while its low dropout operation provides an output voltage ranging from 0.6V to just millivolts below VIN. The LTC3615 operates from an input voltage of 2.25V to 5.5V, making it ideal for single-cell Li-Ion applications as well as 3.3V and 5V intermediate bus systems. Its switching frequency is user programmable from 400kHz to 4MHz, enabling the use of tiny, low cost capacitors and inductors. The combination of its fast switching capability and the very small 4mm x 4mm QFN-24, or thermally enhanced TSSOP-24 package, offer a highly compact solution footprint for applications requiring dual outputs up to 3A.
The LTC3615 uses internal switches with RDS(ON) of only 55mOhms and 75mOhms to deliver efficiencies up to 94%. Burst Mode® operation reduces no-load quiescent current to only 130µA, maximizing both light-load efficiency and run time in battery-powered applications. An adjustable Burst Mode clamp enables designers to optimize light load efficiency. For applications requiring the lowest possible noise, the LTC3615 can be configured to run in either pulse-skipping or forced continuous modes, reducing noise and potential RF interference. Programmable switching slew rates further reduce potential noise concerns. Selectable 0º, 90º or 180º of phase shift between its two channels minimize input current ripple as well as output voltage ripple. The LTC3615 offers inputs for tracking capability as well as a DDR memory mode in which the device can source/sink ±1.5A. Additional features include optional active voltage positioning (AVP) a Power Good voltage monitor, external synchronization capability and thermal protection.
The LTC3615EUF is available in a 4mm x 4mm QFN-24 and the LTC3615EFE is in a TSSOP-24E with exposed pad. Pricing starts at $3.95 and $4.10 each, respectively in 1,000-piece quantities. Industrial grade versions, the LTC3615IUF and LTC3615IFE, are guaranteed to meet specifications over the -40ºC to 125ºC operating junction temperature range and are priced at $4.65 and $4.82 each, respectively in 1,000-piece quantities. For more information, visit http://www.linear.com/pr/3615.
Summary Features LTC3615
High Efficiency: Up to 94%
Dual Outputs with 2 × 3A Output Current Capability
DDR Memory Mode IOUT = ±1.5A
Low Output Ripple Burst Mode® Operation:
IQ = 130µA
2.25V to 5.5V Input Voltage Range
Low Dropout Operation: 100% Duty Cycle
Output Voltages Down to 0.6V
1.33% Output Voltage Accuracy
Programmable Slew Rate at Switch Pins
Shutdown Current =1µA
Adjustable Switching Frequency up to 4MHz
Internal or External Compensation
Selectable Pulse-Skipping/Forced Continuous/Burst Mode Operation with Adjustable Burst Clamp
Optional Active Voltage Positioning (AVP) with Internal Compensation
Selectable 0º/90º/180º Phase Shift between Channels
Fixed Internal & Programmable External Soft-Start
Accurate Start-Up Tracking Capability
Available in Thermally Enhanced 4mm × 4mm QFN-24 & TSSOP-24 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, 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.
Contacts
North America and General Information
John Hamburger
Tel: (408) 432-1900 ext. 2419
jhamburger@linear.com
Doug Dickinson
Tel: (408) 432 1900 ext. 2233
ddickinson@linear.com
