Multiphase Step-Up DC/DC Controller Delivers High Power
Multiphase operation is enabled using the SYNC input, CLOCK output and PHASEMODE control pin, allowing 2-, 3-, 4-, 6- or 12-phase operation. The LTC3862 utilizes peak current mode architecture for easy loop compensation and multi-phase operation with excellent phase-to-phase current matching. The fixed operating frequency can be set with a single resistor over a 75kHz to 500kHz range or can be synchronized to an external clock using the internal phased-lock-loop over a 50kHz to 600kHz frequency range. A current sense resistor is used in each phase to provide a precise cycle-by-cycle current limit. The powerful on-board CMOS gate drivers minimize switching losses and allow the use of multiple MOSFETs in parallel for even higher current applications. Other features include an on-board 5V LDO that eliminates the need for a bias voltage to power the IC, undervoltage lockout protection, a precise RUN pin threshold with programmable hysteresis, adjustable soft-start, programmable maximum duty cycle and user-adjustable leading edge blanking.
The LTC3862 is offered in narrow SSOP-24 and 5mm x 5mm QFN-24 package. Three temperature grades are available with commercial grade operation from -40 to 85°C, an industrial range from -40°C to 125°C, and a high temp automotive range of -40°C to 150°C. The 1,000-piece price starts at $3.29 each.
Summary of Features: LTC3862
Multiphase Operation - Up to 12 Phases
High Output Power
Wide Input Voltage Range from 4V to 36V
Minimum External Components
Fixed Programmable Operating Frequency from 75kHz
Synchronizable with Phase-Lock-Loop (PLL) from 50kHz
Peak Current Mode Control
Programmable Maximum Duty Cycle
High Operating Temperature up to 150°C
LINEAR TECHNOLOGY GmbH
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(TM) 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.
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