Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3808
Edited by the Electronicstalk Editorial Team on 24 June 2005
Spread spectrum FM cuts power supply
noise
The LTC3808 is a step-down synchronous DC/DC controller with integrated spread spectrum frequency modulation for systems requiring very low EMI and low noise power supply.
Linear Technology has introduced the LTC3808, a step-down synchronous DC/DC controller with integrated spread spectrum frequency modulation for systems requiring very low EMI and low noise power supply The LTC3808 minimises the need for EMI shields and filters by randomly varying the switching frequency from 460 to 635kHz, reducing the peak radiated and conducted noise of the DC/DC controller alternatively by more than 20dB when operating the LTC3808 at a constant switching frequency
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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The device provides two options: user-selectable 300, 550 or 750kHz operating frequency or 250-750kHz phase-lock loop (PLL) operation.
The LTC3808 is ideal for use in applications such as navigation systems, wireless LAN, data acquisition boards and industrial/military radio devices.
The LTC3808 converts input voltages of 2.75 to 9.8V to output voltages ranging from 0.6V up to the input voltage.
The LTC3808 drives external complementary power MOSFETs with synchronous operation for high efficiency DC/DC conversion.
The controller can deliver as much as 5A to the load while operating at 90% efficiency.
Although the LTC3808 features a current mode architecture, it improves efficiency and reduces system cost by eliminating the need for a sense resistor by sensing the voltage across the external MOSFETs.
Another feature of the LTC3808 is its output voltage tracking for controlled supply ramps or the sequencing of multiple supplies.
With low input voltage operation, low dropout and low supply current, the device is ideal for wireless battery powered devices.
The LTC3808 is offered in two packages, a low profile (0.75mm) 4 x 3mm DFN and a 16-lead SSOP.
The device is rated for operation from -40 to +85C.
Pricing starts at $2.60 each for 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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