Product category:
Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3528/B
Edited by the Electronicstalk Editorial
Team on 18 January 2008
Convertors boost single cells to 5.25V
Current-mode synchronous boost DC/DC convertors feature output disconnect and integrated soft-start capability.
Linear Technology has released the LTC3528/B family of 1MHz current-mode synchronous boost DC/DC convertors with output disconnect and integrated soft-start capability Their internal 1A switches can deliver output voltages as high as 5.25V from an input voltage range of 0.70V (at startup, 0.5V when running) to 5V, making them ideal for Li-ion/polymer or single/multicell alkaline/NiMH applications
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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The LTC3528/B can deliver up to 200mA of continuous output current (at 3.3V) from a single alkaline cell or 400mA from dual alkaline cells.
Synchronous rectification enables efficiencies up to 94%, and Burst Mode operation lowers quiescent current to only 12uA (LTC3528), providing extended battery runtime in handheld applications.
The combination of a 2 x 3mm DFN-8 package and a constant switching frequency of 1MHz minimises both inductor and capacitor sizes, providing a tiny overall footprint required in handheld applications.
The LTC3528/B has internal switches with an on-resistance of only 0.175ohm (N-channel) and 0.25ohm (P-channel) to deliver efficiencies as high as 94%.
The output disconnect feature allows the output to be completely discharged in shutdown.
It also limits the inrush of current during startup, minimising surge currents seen by the input supply.
The LTC3528/B will also regulate the output when the input voltage exceeds the output voltage.
Additional features include antiringing control, short-circuit protection, soft-start and thermal protection.
The LTC3528/B delivers an ideal solution for boost applications requiring up to 400mA of output current and where a small solution sise and low maximum battery run-time are defining factors.
For applications demanding the lowest possible noise operation, The LTC3528B version is available with the Burst Mode feature disabled.
This version runs in continuous mode at all current levels, slightly reducing light load efficiency.
However, it minimises possible interference of switching noise with onboard noise suppression circuitry.
LTC3528EDDB and LTC3528BEDDB are both available from stock in 8-lead DFN packages.
1000-piece pricing starts at US $1.95 each. Request a free brochure from Linear Technology Corp ...
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