Step-down switching regulator features boost diode
Linear Technology
LT3971 regulator
Linear Technology has introduced the LT3971: a 1.2A, 38V step-down switching regulator with an integrated boost diode.
Its Burst Mode operation keeps quiescent current under 2.8uA in no-load standby conditions.
The LT3971's 4.3-38V input-voltage range makes it suitable for automotive and industrial applications.
Its internal 2.4A switch can deliver up to 1.2A of continuous output current to voltages as low as 1.19V.
The Burst Mode operation offers ultra-low quiescent current, making the LT3971 suitable for applications such as automotive or industrial systems, which demand always-on operation and optimum battery life.
Switching frequency is user programmable from 200kHz to 2MHz, enabling the designer to optimise efficiency while avoiding critical noise-sensitive frequency bands.
The combination of its 10-lead 3 x 3mm DFN-10 (or thermally enhanced MSOP) package and high switching frequency keeps external inductors and capacitors small, providing a compact, thermally efficient footprint.
The LT3971 utilises a high-efficiency 2.4A, 330mohm switch, with the necessary boost diode, oscillator, control and logic circuitry integrated into a single die.
Low-ripple Burst Mode operation maintains high efficiency at low output currents, while keeping output ripple below 15mVPK-PK.
Special design techniques and a new high-voltage process enable high efficiency over a wide input-voltage range and the LT3971's current-mode topology enables fast transient response and excellent loop stability, according to the company.
Other features include a power-good flag, soft-start capability, external clock synchronisation and internal compensation.
The LT3971EDD is packaged in a 3 x 3mm DFN-10 and the LT3971EMSE is packaged in a thermally enhanced MSOP-10, priced from USD2.75 (GBP1.69) each for 1,000-piece quantities.
The LT3971IDD and LT3971IMSE are tested and guaranteed to operate from a -40C to +125C operating junction temperature and are priced at USD3.06 each in 1,000-piece quantities.
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