The LT3481’s Burst Mode operation offers ultra-low quiescent current, well suited for applications such as automotive or telecom systems, which demand always-on operation and optimum battery life. Switching frequency is user programmable from 300kHz to 2.8MHz, enabling the designer to optimize efficiency while avoiding critical noise-sensitive frequency bands. The combination of its 3mm x 3mm DFN-10 package (or thermally enhanced MSOP-10E) and high switching frequency keeps external inductors and capacitors small, providing a compact, thermally efficient footprint.
The LT3481 utilizes a high efficiency 3.2A, 0.18Ohm switch, with the necessary boost diode, oscillator, control and logic circuitry integrated into a single chip. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 15mVPK-PK. Special design techniques enable high efficiency over a wide input voltage range and the device’s current mode topology enables fast transient response and excellent loop stability. Other features include external synchronization (from 275kHz to 475kHz), a power good flag and soft-start capability.
Pricing for the LT3481EDD and LT3481EMSE starts at $3.25 each, for 1,000-piece quantities. The LT3481IDD and LT3481IMSE are tested and guaranteed to operate from a -40°C to 125°C operating junction temperature, priced at $3.90each in 1,000-piece quantities. All versions are available from stock.