DC to DC Power Supplies (Converters)
DC/DC Controller features spread spectrum modulation.
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Press Release Summary:
With input voltage of 2.75-9.8 V, synchronous step-down controller, Model LTC3809, features constant frequency operation and current mode architecture with MOSFET VDS sensing, eliminating need for current sense resistor, and delivering efficiencies as high as 95%. Housed in 3 x 3 mm DFN-10 or MSOP-10 package, unit can be configured with Burst Mode® operation to operate with 100 µA of quiescent current. It can be externally synchronized or adjusted from 250-750 kHz.
Original Press Release:
No RSENSE(TM), Low EMI, Synchronous DC/DC Controller in a 3mm x 3mm DFN
MILPITAS, CA - August 16, 2005 - Linear Technology Corporation announces the LTC3809, a synchronous step-down controller with spread spectrum modulation in a 3mm x 3mm DFN-10 and MSOP-10. The device's constant frequency operation and current mode architecture with MOSFET VDS sensing eliminates the need for a current sense resistor while delivering efficiencies as high as 95%. The LTC3809's input voltage range of 2.75V to 9.8V makes it ideal for single or dual Li-Ion or multi-cell iMH/NiCd/Alkaline applications as well as standard 3.3V and 5Vinputs. The LTC3809 can be configured with Burst Mode® operation to operate with only 100uA of quiescent current.
For noise sensitive applications, Burst Mode operation can be inhibited with the SYNC/MODE pin to reduce noise and RF interference. The LTC3809 can also be externally synchronized or adjusted from 250kHz to 750kHz using its on-chip Phase Locked Loop. To further reduce EMI, the LTC3809 incorporates a user selectable spread spectrum frequency modulation technique. Other features include internal soft-start circuitry, a Power Good output voltage monitor, auxiliary winding regulation and output over-voltage protection.
The LTC3809EDD and LTC3809EMS8E are both available from stock in 3mm x 3mm DFN-10 and MSOP-10 packages, respectively. Pricing starts at $2.50 each in 1,000-piece quantities.
Summary of Features: LTC3809
No Current Sense Resistor Required
Selectable Spread Spectrum Frequency Modulation for Low Noise Operation
Constant Frequency Current Mode Operation for Excellent Line and Load Transient Response
True PLL for Frequency Locking or Adjustment (Frequency Range: 250kHz to 750kHz)
Wide VIN Range: 2.75V to 9.8V
Wide VOUT Range: 0.6V to VIN
0.6V ±1.5% Reference
Low Dropout Operation: 100% Duty Cycle
Selectable Burst Mode/Pulse Skipping/Forced Continuous Operation
Internal Soft-Start Circuitry
Power Good Output Voltage Monitor
Micropower Shutdown: IQ = 9uA
Tiny Thermally Enhanced Leadless (3mm x 3mm) DFN and 10-lead MSOP Packages
Company Background
Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. 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.
LT, LTC and Burst Mode are registered trademarks and No RSENSE is a trademark of Linear Technology Corp.
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
