Dual Synchronous Step-Down DC/DC Converter Delivers 1.4A and 800mA from a 5mm x 3mm DFN

LTC News for Immediate Release
For more information, tel. 408-432-1900
Doug Dickinson, Media Relations Mgr., ext. 2233
John Hamburger, Dir., Mkting Comm., ext. 2419
Dual Synchronous Step-Down DC/DC Converter Delivers
1.4A and 800mA from a 5mm x 3mm DFN
MILPITAS, CA – November 29, 2005– Linear Technology announces the LTC3417, a dual output,
high efficiency, 4 MHz, synchronous buck regulator that delivers up to 1.4A of continuous output
current from one channel and up to 800mA from the second. Using a constant frequency and current
mode architecture, the LTC3417 operates from an input voltage range of 2.25V to 5.5V, making it
ideal for single cell Li-Ion, multi-cell Alkaline or NiMH applications. It can generate two
independent output voltages as low as 0.6V, enabling it to power the latest generation of low voltage
DSPs and microcontrollers. Its switching frequency of up to 4 MHz allows the utilization of tiny,
low cost ceramic capacitors and inductors less than 2 mm in height. The combination of dual
outputs, current mode architecture, tiny externals and a 5mm x 3mm DFN (or TSSOP-20E) package
make the LTC3417 a very compact solution for a variety of applications.
The LTC3417 uses internal switches with an RDS(ON) of only 0.088 Ohm and 0.160 Ohm to
deliver efficiencies as high as 95%. It also utilizes low dropout 100% duty cycle operation to allow
output voltages equal to VIN, further extending battery run-time. With Burst Mode® operation
enabled, no load quiescent current is only 125uA (both channels), and <1uA in shutdown ensuring
optimal battery life. If the application is noise sensitive, the user can disable Burst Mode, replacing it
with a lower noise pulse-skipping mode. A phase mode pin enables the second channel to operate inphase or 180 degrees out-of-phase with respect to channel 1. Out-of-phase operation produces lower
RMS current at VIN, thus lower RMS derating on the input capacitor. Other features include a power
good output, internal soft-start and short-circuit protection.
The LTC3417EDHC is available from stock in a DFN-16 package, and the LTC3417EFE is
available in a thermally enhanced TSSOP package. The LTC3417EDHC starts at $3.35, for the
LTC3417EFE $3.55 each, both in 1,000-piece quantities.
LTC3417: Dual Synchronous Step-Down DC/DC Converter
Delivers Up to 1.4A and 800mA from a 5mm x 3mm DFN
page 2
Summary of Features: LTC3417
High Efficiency: Up to 95%
1.4A/800mA Output Current
Programmable Frequency Operation: 1.5MHz or Adjustable From 0.6MHz to 4MHz
Low RDS(ON) Internal Switches
VIN: 2.25V to 5.5V
Current Mode Operation for Excellent Line and Load Transient Response
125µA Quiescent Current
Ultralow Shutdown Current: IQ < 1µA
Low Dropout Operation: 100% Duty Cycle
Power Good Output
Phase Pin Selects 2nd Channel Phase Relationship with Respect to 1st Channel
Available in Small Thermally Enhanced (5mm x 3mm) DFN and 20-Lead Thermally Enhance TSSOP
About Linear Technology Corporation
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, 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
Doug Dickinson, Media Relations Manager
Linear Technology Corporation
1630 McCarthy Boulevard
Milpitas, CA 95035-7417
[email protected]
READER SERVICE: Call toll-free 1-800-4-LINEAR (for literature only), or go to the company’s web site:
Note: LT, LTC, Burst Mode and
are registered trademarks of Linear Technology Corp.