DC/DC controller drives N-channel power Mosfets
A Linear Technology Corp product story
Edited by the Electronicstalk editorial team Nov 5, 2009
Linear Technology has announced the LTC3854, a tiny 2mm x 3mm DFN-12 packaged, wide input voltage range synchronous step-down switching DC/DC controller that drives all N-channel power Mosfet stages.
The 4V to 38V input range addresses a wide variety of applications, including most intermediate bus voltages and battery chemistries.
Linear Technology has announced the LTC3854, a tiny 2mm x 3mm DFN-12 packaged, wide input voltage range synchronous step-down switching DC/DC controller.
The strong on-board Mosfet gate drivers enable high-power external Mosfets to produce output currents up to 20A with output voltages ranging from 0.8V to 5.5V.
This makes the LTC3854 suitable for point-of-load regulation requirements in datacom, telecom, industrial, automotive, medical and multi-function printer applications.
A constant-frequency current mode architecture provides a fixed 400kHz operating frequency.
The LTC3854 features an onboard 5V regulator, eliminating the need for a separate bias voltage to power the chip.
Opti-loop compensation allows the transient response to be optimised over a wide range of output capacitance and ESR values, including all ceramic capacitor designs.
Output current sensing measures the voltage drop across the output inductor (DCR) or an optional sense resistor.
Current foldback limits Mosfet heat dissipation during short-circuit and overload conditions.
In addition, the LTC3854 has adjustable soft-start to control the turn-on time and manage inrush current.
Selectable continuous or discontinuous inductor current modes are available to safely power pre-biased loads.
Anti-shoot-through protection prevents shoot-through current in the power Mosfets.
Operating up to 96 per cent duty cycle, the LTC3854 has a very low dropout voltage for extending run times in battery-powered applications.
The LTC3854 features a precision 0.8V reference with an accuracy of +/-1 per cent over the -40C to 85C operating temperature range.
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Contact Linear Technology Corp
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Other Linear Technology Corp stories
- Linear DC/DC controller has wide input range
Linear Technology has announced the LT3757, a wide-input-range DC/DC controller for boost, flyback, SEPIC and inverting power supply applications. - Linear unveils H-grade DC/DC controller
Linear Technology has announced the H-grade version of the LTC3824, a 4V to 60V input range, low quiescent current step-down DC/DC controller in a small thermally enhanced MSOP-10 package. - Controller offers buck-boost regulation
Linear Technology offers a high-reliability (MP) grade version of the LTC3780, a very high efficiency synchronous buck-boost switching regulator DC/DC controller. - DC/DC controllers for space-critical applications
Linear Technology has introduced the LTC3878 and LTC3879 high-efficiency no RSENSE synchronous step-down DC/DC controllers. - Linear releases H-Grade LTC3803 DC/DC controller
Linear Technology has unveiled the H-Grade version of the LTC3803: a current-mode flyback DC/DC controller in a tiny six-pin ThinSOT package.
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