DC/DC controller drives N-channel power Mosfets
Linear Technology
DC/DC controller
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.
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.
Related images
Request more information
More stories
Data sheet: LTC3617 monolithic synchronous buck regulator from Linear Technologydownload
The LTC3617 from Linear Technology is a high-efficiency monolithic synchronous buck regulator that utilises a current-mode, constant-frequency architecture.
Linear Technology offers DC/DC controller suitable for sectors such as automotiveweblink
The LT3759 DC/DC controller from Linear Technology — which can generate negative or positive output voltages — is suitable for boost, SEPIC and inverting supply applications within sectors such as industrial, automotive, medical and telecom.
Data sheet: LT3759 current-mode DC/DC controller from Linear Technologydownload
The LT3759 from Linear Technology is a current-mode DC/DC controller that is capable of regulating either positive or negative output voltages from a single feedback pin. It can be configured as a boost, SEPIC or inverting converter.
Linear Technology offers frequency synthesiser for applications such as avionicsweblink
The LTC6946 frequency synthesiser from Linear Technology is suitable for improving the performance of multiband basestations that support LTE, W-CDMA, UMTS, CDMA, GSM and WiMAX standards — as well as point-to-point broadband wireless access, military, avionics, and high-performance test and measurement applications.
Data sheet: LTC6946 integer-N synthesiser with integrated VCO from Linear Technologydownload
The LTC6946 from Linear Technology is a low-noise 5.7GHz phase-locked loop (PLL) with a fully integrated VCO, including a reference divider, a phase-frequency detector with phase-lock indicator, an ultra-low-noise charge pump, an integer feedback divider and a VCO output divider. The charge pump contains selectable high- and low-voltage clamps that are useful for VCO monitoring.
