32V Input Synchronous Step-Down Regulator Delivers 10A from a 9mm x 9mm QFN

News Release ⎜ www.linear.com
32V Input Synchronous Step-Down Regulator Delivers
10A from a 9mm x 9mm QFN
MILPITAS, CA – March 10, 2008 – Linear Technology announces the LTC3611, a high
efficiency, synchronous buck regulator that delivers up to 10A of continuous output current at
voltages as low as 0.6V. It operates from an input voltage of 4.5V to 32V (36V ABS Max),
making it ideal for applications with multicell Li-Ion, lead acid batteries or fixed voltage rails up
to 32V. Its valley current control architecture delivers very low duty cycle operation at high
frequencies with excellent transient response. The operating frequency is set by an external
resistor. Switching frequencies of up to 1 MHz allow the utilization of small, low cost ceramic
capacitors and low profile inductors.
The LTC3611 uses internal switches with an RDS(ON) of only 15mOhm and 9mOhm to
deliver efficiencies as high as 95%. The LTC3611 can be configured for discontinuous or forced
continuous operation. Forced continuous operation reduces noise and RF interference while
discontinuous mode provides high efficiency by reducing switching losses at light loads while
requiring only 900uA of quiescent current. Additional features include a Power Good voltage
monitor, adjustable current limit, output overvoltage protection and programmable soft-start.
The LTC3611EWP is available from stock in a 64-lead, 9mm x 9mm QFN package.
Pricing starts at $9.75 in 1,000-piece quantities. An industrial grade version, the LTC3611IWP is
tested and guaranteed to operate from a -40°C to 125°C operating junction temperature and is
priced at $11.21 in 1,000-piece quantities. All versions are available from stock.
32V Input Synchronous Step-Down Regulator Delivers
10A from a 9mm x 9mm QFN
page 2
Photo Caption: 10A, 32V Synchronous Step-Down DC/DC Converter in QFN
Summary of Features: LTC3611
32VIN, 10A Synchronous Buck Converter 9mm x 9mm QFN
10A Output Current
Wide VIN Range = 4.5V to 32V (36V Maximum)
Integrated N-Channel Power MOSFETs
True Current Mode Control
Optimized for High Step-Down Ratios
Extremely Fast Transient Response
Stable with Ceramic COUT
±1% 0.6V Voltage Reference
Power Good Output Voltage Monitor
Adjustable On-Time/Switching Frequency (>1MHz)
Adjustable Current Limit
Programmable Soft-Start
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
Low Shutdown IQ: 15uA
Available in a 9mm × 9mm 64-Pin QFN Package
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™ 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. For more
information, visit www.linear.com.
LT, LTC, LTM and
are registered trademarks and uModule is a trademark of Linear Technology Corp.
Press Contacts:
John Hamburger, Director Marketing Communications
[email protected]
Tel: 408-432-1900 ext 2419
Doug Dickinson, Media Relations Manager
[email protected]
Tel: 408-432-1900 ext 2233