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Synchronous Controller includes output tracking function.

Press Release Summary:

With input range of 2.75-9.8 V, 2-phase, dual step-down switching regulator, Model LTC3736-2 deliver outputs as low as 0.6 V. Constant frequency current mode architecture with MOSFET VDS sensing eliminates need for sense resistors. By operating 2 controllers out of phase, power loss and noise due to ESR of input capacitance are minimized. Switching frequency can be programmed up to 750 kHz and externally sychronized from 250-850 kHz using phase locked loop.

Original Press Release:

Dual 2-Phase, No RSENSE(TM), Synchronous Controller with Output Tracking

MILPITAS, CA - November 22, 2005 - Linear Technology announces the LTC3736-2, a 2-phase dual synchronous step-down switching regulator controller with output tracking that drives a wide range of external power MOSFETs. Its 2.75V to 9.8V input range enables it to operate from a wide range of inputs, from single cell Li-Ion, multicell NiCd/NiMH, as well as fixed 5V inputs. It can deliver outputs as low as 0.6V. The LTC3736-2's constant frequency current mode architecture with MOSFET VDS sensing eliminates the need for sense resistors while improving efficiency. By operating the two controllers out of phase, both power loss and noise due to the ESR of the input capacitance are minimized.

The LTC3736-2's switching frequency can be programmed up to 750kHz, allowing the use of small surface mount inductors and capacitors. For noise sensitive applications, the LTC3736-2 switching frequency can be externally synchronized from 250kHz to 850kHz utilizing a phase locked loop (PLL). Pulse skipping operation provides high efficiency at light loads while 100% duty cycle capability provides low dropout operation, extending operating time in battery-powered systems. Other features include an internal soft-start, Power Good Output voltage monitor and overvoltage protection.

The LTC3736EUF-2 is available from stock in a 4mm x 4mm QFN-24 package. Pricing starts at $3.90 each for 1,000-piece quantities.

Summary of Features: LTC3736-2
No Current Sense Resistors Required
Out-of-Phase Controllers Reduce Required Input Capacitance
Output Tracking Function
Wide VIN Range: 2.75V to 9.8V
0.6V + 1% Voltage Reference
High Current Limit
Constant Frequency Current Mode Operation
Low Dropout Operation: 100% Duty Cycle
True PLL for Frequency Locking or Adjustment
Selectable Pulse Skipping/Forced Continuous Operation
Auxiliary Winding Regulation
Internal Soft-Start Circuitry
Power Good Output Voltage Monitor
Output Overvoltage Protection
Micropower Shutdown: IQ = 9uA
Tiny Low Profile (4mm x 4mm) QFN Package

Company Background
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 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

LT, LTC and LTM are registered trademarks and RSENSE of Linear Technology Corp.

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

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

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